PacifiCorp (PPWLM) 10-K 25 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 19, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Registrant Name	BERKSHIRE HATHAWAY ENERGY CO
Entity Central Index Key	1,081,316
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		76,549,232
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 0
PacifiCorp [Member]
Document Information [Line Items]
Entity Registrant Name	PACIFICORP /OR/
Entity Central Index Key	75,594
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		357,060,915
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			0
MidAmerican Funding, LLC and Subsidiaries [Domain]
Document Information [Line Items]
Entity Registrant Name	MIDAMERICAN FUNDING, LLC
Entity Central Index Key	1,098,296
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	No
Entity Public Float			0
MidAmerican Energy Company and Subsidiaries [Member]
Document Information [Line Items]
Entity Registrant Name	MIDAMERICAN ENERGY COMPANY
Entity Central Index Key	928,576
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		70,980,203
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			0
Nevada Power Company [Member]
Document Information [Line Items]
Entity Registrant Name	NEVADA POWER COMPANY
Entity Central Index Key	71,180
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			0
Sierra Pacific Power Company [Member]
Document Information [Line Items]
Entity Registrant Name	SIERRA PACIFIC POWER COMPANY
Entity Central Index Key	90,144
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 627	$ 935
Restricted Cash and Cash Equivalents, Current		227	327
Accounts Receivable, Net, Current		2,038	2,014
Income Taxes Receivable, Current		90	334
Inventories
Fuel		273	352
Inventories		844	888
Mortgage loans held for sale		468	465
Regulatory assets		171	189
Other current assets		853	815
Total current assets		5,147	5,778
Property, plant and equipment, net		68,595	65,871
Goodwill		9,595	9,678
Regulatory assets		2,896	2,761
Investments and restricted cash and cash equivalents and investments		4,903	4,872
Other assets		1,053	1,248
Total assets		92,189	90,208
Current liabilities:
Accounts payable		1,809	1,519
Accrued interest		469	488
Accrued property, income and other taxes		599	354
Accrued employee expenses		275	274
Regulatory liabilities		160	202
Short-term debt	[1]	2,516	4,488
Current portion of long-term debt		2,106	3,431
Other current liabilities		996	1,049
Total current liabilities		8,770	11,603
BHE senior debt		8,577	5,452
Regulatory liabilities		7,346	7,309
BHE junior subordinated debentures		100	100
Subsidiary debt		25,991	26,210
Deferred income taxes		9,047	8,242
Other long-term liabilities		2,635	2,984
Asset Retirement Obligations, Noncurrent		942	894
Total liabilities		62,466	61,900
Commitments and contingencies
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		6,371	6,368
Long-term income tax receivable		(457)	0
Retained earnings		25,624	22,206
Accumulated other comprehensive loss, net		(1,945)	(398)
Total shareholders' equity		29,593	28,176
Noncontrolling interests		130	132
Total equity		29,723	28,308
Total liabilities and equity		92,189	90,208
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents		71	4
Restricted Cash and Cash Equivalents, Current		5	4
Accounts Receivable, Net, Current		109	112
Inventories
Fuel		8	7
Inventories		52	49
Regulatory assets		7	32
Other current assets		24	17
Total current assets		263	214
Public Utilities, Property, Plant and Equipment, Net		2,984	2,892
Regulatory assets		314	300
Other assets		8	7
Total assets		3,569	3,413
Current liabilities:
Accounts payable		116	92
Accrued interest		13	14
Accrued property, income and other taxes		14	10
Regulatory liabilities		18	19
Long-term Debt and Capital and Financial Lease Obligations, Current		3	2
Customer Deposits, Current		18	15
Other current liabilities		15	12
Total current liabilities		197	164
Regulatory liabilities		491	481
Long-term Debt and Capital and Financial Lease Obligations		1,155	1,152
Deferred income taxes		331	330
Other long-term liabilities		131	114
Asset Retirement Obligations, Noncurrent		10	10
Total liabilities		2,305	2,241
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		1,111	1,111
Retained earnings		153	62
Accumulated other comprehensive loss, net		0	(1)
Total shareholders' equity		1,264	1,172
Total liabilities and equity		3,569	3,413
PacifiCorp [Member]
Current assets:
Cash and cash equivalents		77	14
Restricted Cash and Cash Equivalents, Current		13	13
Receivables, Net, Current		640	631
Other Receivables, Net, Current		92	53
Inventories
Inventories		417	433
Regulatory assets		36	31
Prepaid Expense, Current		47	73
Other current assets		86	111
Total current assets		1,359	1,315
Public Utilities, Property, Plant and Equipment, Net		19,591	19,203
Regulatory assets		1,076	1,030
Other assets		287	372
Total assets		22,313	21,920
Current liabilities:
Accounts payable		597	453
Accrued interest		114	115
Accrued property, income and other taxes		75	66
Accrued employee expenses		79	70
Regulatory liabilities		77	75
Short-term debt		30	80
Current portion of long-term debt and capital lease obligations		352	588
Other current liabilities		191	170
Total current liabilities		1,515	1,617
Regulatory liabilities		2,978	2,996
Long-term debt and capital lease obligations		6,684	6,437
Deferred income taxes		2,543	2,582
Other long-term liabilities		748	733
Asset Retirement Obligations, Noncurrent		206	190
Total liabilities		14,468	14,365
Commitments and contingencies
Shareholders' equity:
Preferred stock		2	2
Common stock		0	0
Additional paid-in capital		4,479	4,479
Retained earnings		3,377	3,089
Accumulated other comprehensive loss, net		(13)	(15)
Total shareholders' equity		7,845	7,555
Total liabilities and equity		22,313	21,920
MidAmerican Energy Company [Member]
Current assets:
Cash and cash equivalents		0	172
Receivables, Net, Current		367	344
Income Taxes Receivable, Current		0	51
Inventories
Inventories		204	245
Other current assets		90	134
Total current assets		661	946
Public Utilities, Property, Plant and Equipment, Net		16,159	14,207
Regulatory assets		273	204
Investments and restricted cash and cash equivalents and investments		708	728
Other assets		119	233
Total assets		17,920	16,318
Current liabilities:
Accounts payable		575	452
Accrued interest		53	48
Accrued property, income and other taxes		300	132
Short-term debt		240	0
Current portion of long-term debt and capital lease obligations		500	350
Other current liabilities		122	128
Total current liabilities		1,790	1,110
Regulatory liabilities		1,620	1,661
Long-term debt and capital lease obligations		4,881	4,692
Deferred income taxes		2,322	2,237
Other long-term liabilities		309	326
Asset Retirement Obligations, Noncurrent		552	528
Total liabilities		11,474	10,554
Commitments and contingencies
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		561	561
Retained earnings		5,885	5,203
Total shareholders' equity		6,446	5,764
Total liabilities and equity		17,920	16,318
MidAmerican Funding, LLC and Subsidiaries [Domain]
Current assets:
Cash and cash equivalents		1	172
Restricted Cash and Cash Equivalents, Current		56	110
Receivables, Net, Current		365	348
Income Taxes Receivable, Current		0	64
Inventories
Inventories		204	245
Other current assets		89	134
Total current assets		659	963
Property, plant and equipment, net		16,171	14,221
Goodwill		1,270	1,270
Regulatory assets		273	204
Investments and restricted cash and cash equivalents and investments		710	730
Other assets		119	233
Total assets		19,202	17,621
Current liabilities:
Accounts payable		575	451
Accrued interest		58	53
Accrued property, income and other taxes		300	133
Notes Payable, Related Parties, Current		156	164
Short-term debt		240	0
Current portion of long-term debt and capital lease obligations		500	350
Other current liabilities		122	128
Total current liabilities		1,951	1,279
Regulatory liabilities		1,620	1,661
Long-term debt and capital lease obligations		5,121	4,932
Deferred income taxes		2,319	2,235
Other long-term liabilities		310	326
Asset Retirement Obligations, Noncurrent		552	528
Total liabilities		11,873	10,961
Commitments and contingencies
Shareholders' equity:
Additional paid-in capital		1,679	1,679
Retained earnings		5,650	4,981
Total shareholders' equity		7,329	6,660
Total liabilities and equity		19,202	17,621
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents		111	57
Restricted Cash and Cash Equivalents, Current		10	9
Accounts Receivable, Net, Current		240	238
Inventories
Fuel		5	3
Inventories		61	59
Regulatory assets		39	28
Other current assets		68	44
Total current assets		519	426
Public Utilities, Property, Plant and Equipment, Net		6,868	6,877
Regulatory assets		878	941
Other assets		37	35
Total assets		8,302	8,279
Current liabilities:
Accounts payable		187	156
Accrued interest		38	50
Accrued property, income and other taxes		30	63
Regulatory liabilities		49	91
Long-term Debt and Capital and Financial Lease Obligations, Current		520	842
Customer Deposits, Current		67	73
Other current liabilities		29	16
Total current liabilities		920	1,291
Regulatory liabilities		1,137	1,030
Long-term Debt and Capital and Financial Lease Obligations		2,296	2,233
Deferred income taxes		749	767
Other long-term liabilities		296	280
Asset Retirement Obligations, Noncurrent		70	76
Total liabilities		5,398	5,601
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		2,308	2,308
Retained earnings		600	374
Accumulated other comprehensive loss, net		(4)	(4)
Total shareholders' equity		2,904	2,678
Total liabilities and equity		8,302	8,279
Parent Company [Member]
Current assets:
Cash and cash equivalents		9	346
Income Taxes Receivable, Current		103	0
Inventories
Other current assets		15	21
Total current assets		383	818
Goodwill		1,221	1,221
Other assets		546	1,155
Total assets		40,331	39,330
Current liabilities:
Notes Payable, Related Parties, Current		328	182
Short-term debt		983	3,331
Total current liabilities		1,494	4,781
BHE senior debt		8,577	5,452
BHE junior subordinated debentures		100	100
Notes payable - affiliate		1	1
Other long-term liabilities		543	800
Total liabilities		10,715	11,134
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		6,371	6,368
Retained earnings		25,624	22,206
Accumulated other comprehensive loss, net		(1,945)	(398)
Total shareholders' equity		29,593	28,176
Noncontrolling interests		23	20
Total equity		29,616	28,196
Total liabilities and equity		40,331	39,330
Deferred Income Tax Charge [Member] | MidAmerican Energy Company [Member]
Current liabilities:
Regulatory liabilities	[2]	$ 626	$ 681
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2]	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations.(4)

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Shareholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115,000,000	115,000,000
Common stock, shares issued	77,000,000	77,000,000
Common stock, shares outstanding	77,000,000	77,000,000
PacifiCorp [Member]
Shareholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	357,000,000	357,000,000
Common stock, shares outstanding	357,000,000	357,000,000
Nevada Power Company [Member]
Shareholders' equity:
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000
Sierra Pacific Power Company [Member]
Shareholders' equity:
Common Stock, Par or Stated Value Per Share	$ 3.75	$ 3.75
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000
Common Stock [Member]
Shareholders' equity:
Common stock, shares outstanding	77,000,000	77,000,000
Common Stock [Member] | MidAmerican Energy Company [Member]
Shareholders' equity:
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	70,980,203	70,980,203
Common stock, shares outstanding	70,980,203	70,980,203
Common Stock [Member] | Nevada Power Company [Member]
Shareholders' equity:
Common stock, shares outstanding	1,000	1,000
Common Stock [Member] | Sierra Pacific Power Company [Member]
Shareholders' equity:
Common stock, shares outstanding	1,000	1,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenue:
Total operating revenue	$ 19,787	$ 18,614	$ 17,422
Energy:
Cost of Goods and Services Sold	4,769	4,518	4,315
Operations and maintenance	3,440	3,210	3,176
Depreciation and amortization	2,933	2,580	2,560
Taxes, Miscellaneous	573	555	535
Real estate	4,000	3,229	2,589
Total operating expenses	15,715	14,092	13,175
Operating income	4,072	4,522	4,247
Other income (expense):
Interest expense	(1,838)	(1,841)	(1,854)
Capitalized interest and allowance for borrowed funds	61	45	139
Allowance for equity funds	104	76	158
Other Interest and Dividend Income	113	111	120
Gain (Loss) on Investments	(538)	14	10
Other, net	(9)	(420)	30
Total other income (expense)	(2,107)	(2,015)	(1,397)
Income before income tax (benefit) expense and equity income (loss)	1,965	2,507	2,850
Income tax (benefit) expense	(583)	(554)	403
Equity income (loss)	43	(151)	123
Net income	2,591	2,910	2,570
Net income attributable to noncontrolling interests	23	40	28
Net income (loss) attributable to parent	2,568	2,870	2,542
Electricity and natural gas [Member]
Operating revenue:
Total operating revenue	15,573	15,171	14,621
Residential real estate brokerage and mortgage businesses [Member]
Operating revenue:
Total operating revenue	4,214	3,443	2,801
PacifiCorp [Member]
Operating revenue:
Total operating revenue	5,026	5,237	5,201
Energy:
Cost of Goods and Services Sold	1,757	1,770	1,751
Operations and maintenance	1,038	1,034	1,062
Utilities Operating Expense, Depreciation and Amortization	979	796	770
Taxes, other than income taxes	201	197	190
Total operating costs and expenses	3,975	3,797	3,773
Operating income	1,051	1,440	1,428
Other income (expense):
Interest expense	(384)	(381)	(380)
Capitalized interest and allowance for borrowed funds	18	11	15
Allowance for equity funds	35	20	27
Other, net	23	38	13
Total other income (expense)	(308)	(312)	(325)
Income before income tax (benefit) expense and equity income (loss)	743	1,128	1,103
Income tax (benefit) expense	5	360	340
Net income (loss) attributable to parent	738	768	763
MidAmerican Energy Company [Member]
Operating revenue:
Total operating revenue	3,049	2,837	2,625
Energy:
Operations and maintenance	811	799	708
Utilities Operating Expense, Depreciation and Amortization	609	500	479
Taxes, other than income taxes	125	119	112
Total operating expenses	2,498	2,294	2,075
Operating income	551	543	550
Other income (expense):
Interest expense	(227)	(214)	(196)
Capitalized interest and allowance for borrowed funds	20	15	8
Allowance for equity funds	53	41	19
Other, net	30	37	29
Total other income (expense)	(124)	(121)	(140)
Income before income tax (benefit) expense and equity income (loss)	427	422	410
Income tax (benefit) expense	(255)	(183)	(132)
Net income (loss) attributable to parent	682	605	542
MidAmerican Energy Company [Member] | Electricity, US Regulated [Member]
Operating revenue:
Total operating revenue	2,283	2,108	1,985
Energy:
Cost of Goods and Services Sold	487	434	409
MidAmerican Energy Company [Member] | Regulated natural gas and other [Member]
Operating revenue:
Total operating revenue	766	729	640
Energy:
Cost of Goods and Services Sold	466	442	367
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Total operating revenue	3,053	2,846	2,631
Energy:
Operations and maintenance	813	802	709
Utilities Operating Expense, Depreciation and Amortization	609	500	479
Taxes, other than income taxes	125	119	112
Total operating expenses	2,503	2,302	2,080
Operating income	550	544	551
Other income (expense):
Interest expense	(247)	(237)	(219)
Capitalized interest and allowance for borrowed funds	20	15	8
Allowance for equity funds	53	41	19
Other, net	31	9	34
Total other income (expense)	(143)	(172)	(158)
Income before income tax (benefit) expense and equity income (loss)	407	372	393
Income tax (benefit) expense	(262)	(202)	(139)
Net income (loss) attributable to parent	669	574	532
MidAmerican Funding, LLC and Subsidiaries [Domain] | Electricity, US Regulated [Member]
Operating revenue:
Total operating revenue	2,283	2,108	1,985
Energy:
Cost of Goods and Services Sold	487	434	409
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated natural gas and other [Member]
Operating revenue:
Total operating revenue	770	738	646
Energy:
Cost of Goods and Services Sold	469	447	371
Nevada Power Company [Member]
Operating revenue:
Total operating revenue	2,184	2,206	2,083
Energy:
Cost of Goods and Services Sold	917	902	768
Operations and maintenance	443	391	391
Utilities Operating Expense, Depreciation and Amortization	337	308	303
Taxes, other than income taxes	41	40	38
Total operating expenses	1,738	1,641	1,500
Operating income	446	565	583
Other income (expense):
Interest expense	(170)	(179)	(185)
Capitalized interest and allowance for borrowed funds	2	1	4
Allowance for equity funds	3	1	2
Other, net	17	23	21
Total other income (expense)	(148)	(154)	(158)
Income before income tax (benefit) expense and equity income (loss)	298	411	425
Income tax (benefit) expense	72	156	146
Net income (loss) attributable to parent	226	255	279
Sierra Pacific Power Company [Member]
Operating revenue:
Total operating revenue	855	812	812
Energy:
Operations and maintenance	190	167	169
Utilities Operating Expense, Depreciation and Amortization	119	114	118
Taxes, other than income taxes	23	24	24
Total operating expenses	703	615	631
Operating income	152	197	181
Other income (expense):
Interest expense	(44)	(43)	(54)
Capitalized interest and allowance for borrowed funds	1	2	4
Allowance for equity funds	4	3	(1)
Other, net	9	5	3
Total other income (expense)	(30)	(33)	(48)
Income before income tax (benefit) expense and equity income (loss)	122	164	133
Income tax (benefit) expense	30	55	49
Net income (loss) attributable to parent	92	109	84
Sierra Pacific Power Company [Member] | Electricity, US Regulated [Member]
Operating revenue:
Total operating revenue	752	713	702
Energy:
Cost of Goods and Services Sold	322	268	265
Sierra Pacific Power Company [Member] | Natural Gas, US Regulated [Member]
Operating revenue:
Total operating revenue	103	99	110
Energy:
Cost of Goods and Services Sold	$ 49	$ 42	$ 55

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 2,591	$ 2,910	$ 2,570
Net income (loss) attributable to parent	2,568	2,870	2,542
Other comprehensive income (loss), net of tax:
Unrecognized amounts on retirement benefits, net of tax	(25)	(64)	9
Foreign currency translation adjustment	(494)	546	(583)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	500	(30)
Unrealized (losses) gains on cash flow hedges, net of tax	7	3	19
Total other comprehensive (loss) income, net of tax	(462)	1,113	(603)
Comprehensive income	2,129	4,023	1,967
Comprehensive income attributable to noncontrolling interests	23	40	28
Comprehensive income attributable to shareholders	2,106	3,983	1,939
Parent Company [Member]
Net income	2,571	2,873	2,545
Net income (loss) attributable to parent	2,568	2,870	2,542
Other comprehensive income (loss), net of tax:
Total other comprehensive (loss) income, net of tax	(462)	1,113	(603)
Comprehensive income	2,109	3,986	1,942
Comprehensive income attributable to noncontrolling interests	3	3	3
Comprehensive income attributable to shareholders	2,106	3,983	1,939
Nevada Power Company [Member]
Net income (loss) attributable to parent	226	255	279
PacifiCorp [Member]
Net income (loss) attributable to parent	738	768	763
Other comprehensive income (loss), net of tax:
Unrecognized amounts on retirement benefits, net of tax	2	3	1
Total other comprehensive (loss) income, net of tax	2	(3)	(1)
Comprehensive income attributable to shareholders	740	765	762
MidAmerican Energy Company [Member]
Net income (loss) attributable to parent	682	605	542
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available-for-sale securities, net of tax	0	0	3
Total other comprehensive (loss) income, net of tax			3
Comprehensive income attributable to shareholders	682	605	545
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income (loss) attributable to parent	669	574	532
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available-for-sale securities, net of tax	0	0	3
Total other comprehensive (loss) income, net of tax			3
Comprehensive income attributable to shareholders	$ 669	$ 574	$ 535

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax effect - unrecognized amounts on retirement benefits	$ 8	$ 9	$ 11
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	270	(19)
Income tax effect - unrealized (losses) gains on cash flow hedges	1	(7)	13
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	0	1
MidAmerican Energy Company [Member]
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	0	1
PacifiCorp [Member]
Income tax effect - unrecognized amounts on retirement benefits	$ (1)	$ (3)	$ 0

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Long-term income tax receivable [Member]	PacifiCorp [Member]	PacifiCorp [Member]Preferred Stock [Member]	PacifiCorp [Member]Common Stock [Member]	PacifiCorp [Member]Additional Paid-in Capital [Member]	PacifiCorp [Member]Retained Earnings [Member]	PacifiCorp [Member]Accumulated Other Comprehensive Income (Loss) [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]Common Stock [Member]	MidAmerican Energy Company [Member]Additional Paid-in Capital [Member]	MidAmerican Energy Company [Member]Retained Earnings [Member]	MidAmerican Energy Company [Member]Accumulated Other Comprehensive Income (Loss) [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]Additional Paid-in Capital [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]Retained Earnings [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]Accumulated Other Comprehensive Income (Loss) [Member]	Sierra Pacific Power Company [Member]	Sierra Pacific Power Company [Member]Common Stock [Member]	Sierra Pacific Power Company [Member]Additional Paid-in Capital [Member]	Sierra Pacific Power Company [Member]Retained Earnings [Member]	Sierra Pacific Power Company [Member]Accumulated Other Comprehensive Income (Loss) [Member]	Nevada Power Company [Member]	Nevada Power Company [Member]Common Stock [Member]	Nevada Power Company [Member]Additional Paid-in Capital [Member]	Nevada Power Company [Member]Retained Earnings [Member]	Nevada Power Company [Member]Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2014								$ 7,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to parent								695
Balance (shares) at Dec. 31, 2015		77,000,000																						1,000					1,000
Balance at Dec. 31, 2015	$ 22,535	$ 0	$ 6,403	$ 16,906	$ (908)	$ 134
Balance at Dec. 31, 2015								7,503	$ 2	$ 0	$ 4,479	$ 3,033	$ (11)	$ 4,705	$ 0	$ 561	$ 4,174	$ (30)	$ 5,525	$ 1,679	$ 3,876	$ (30)	$ 1,076	$ 0	$ 1,111	$ (35)	$ 0	$ 3,163	$ 0	$ 2,308	$ 858	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,556	0	0	2,542	0	14
Net income	2,570
Net income (loss) attributable to parent	2,542							763		0	0	763	0	542			542		532		532		84			84		279			279
Other comprehensive income (loss)	(603)	0	0	0	(603)	0		(1)		0	0	0	(1)	3				3	3			3
Stockholders' equity transfer to affiliate																			27			27
Dividend, noncash, transfer of operations														(90)			(117)	(27)	(90)
Distributions	(20)	0	0	0	0	(20)
Common stock dividends declared								(875)		0	0	(875)	0										(51)			(51)		(469)			(469)
Other equity transactions	(5)	$ 0	(13)	0	0	8													(1)		(1)		(1)				(1)	(1)			(1)
Balance (shares) at Dec. 31, 2016		77,000,000																						1,000					1,000
Balance at Dec. 31, 2016	24,463	$ 0	6,390	19,448	(1,511)	136
Balance at Dec. 31, 2016								7,390	2	0	4,479	2,921	(12)	5,160	$ 0	561	4,599	0	6,086	1,679	4,407	0	1,108	$ 0	1,111	(2)	(1)	2,972	$ 0	2,308	667	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,892	0	0	2,870	0	22
Net income	2,910
Net income (loss) attributable to parent	2,870							768		0	0	768	0	605			605		574		574		109			109		255			255
Other comprehensive income (loss)	1,113	0	0	0	1,113	0		(3)		0	0	0	(3)
Dividend, noncash, transfer of operations														0					0
Distributions	(22)	0	0	0	0	(22)
Common stock dividends declared								$ (600)		0	0	(600)	0										$ (45)			(45)		(548)			(548)
Common stock, value, repurchased	(19)		(1)	(18)
Conversion of Stock, Amount Converted	(100)		(6)	(94)
Other equity transactions	$ (19)	$ 0	(15)	0	0	(4)								(1)			(1)											$ (1)				(1)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000						357,000,000							70,980,203								1,000	1,000				1,000	1,000
Balance at Dec. 31, 2017	$ 28,308	$ 0	6,368	22,206	(398)	132
Balance at Dec. 31, 2017	28,176							$ 7,555	2	0	4,479	3,089	(15)	5,764	$ 0	561	5,203	0	6,660	1,679	4,981	0	$ 1,172	$ 0	1,111	62	(1)	$ 2,678	$ 0	2,308	374	(4)
Long-term income tax receivable	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	1,085			1,085	(1,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,588	0	0	2,568	0	20
Net income	2,591
Net income (loss) attributable to parent	2,568							738		0	0	738	0	682			682		669		669		$ 92			92		$ 226			226
Other comprehensive income (loss)	(462)	0	0	0	(462)	0		2		0	0	0	2
Reclassification of long-term income tax receivable	(609)						$ (609)
Long-term income tax receivable adjustments	17			(135)			152
Dividend, noncash, transfer of operations														0					0
Common stock dividends declared								$ (450)		0	0	(450)	0
Common stock, value, repurchased	(107)	0	(6)	(101)	0	0
Conversion of Stock, Amount Converted	(23)	0	0	0	0	(23)
Other equity transactions	$ 11	$ 0	9	1	0	1																				(1)	1
Balance (shares) at Dec. 31, 2018	77,000,000	77,000,000						357,000,000							70,980,203								1,000	1,000				1,000	1,000
Balance at Dec. 31, 2018	$ 29,723	$ 0	$ 6,371	$ 25,624	$ (1,945)	$ 130
Balance at Dec. 31, 2018	29,593							$ 7,845	$ 2	$ 0	$ 4,479	$ 3,377	$ (13)	$ 6,446	$ 0	$ 561	$ 5,885	$ 0	$ 7,329	$ 1,679	$ 5,650	$ 0	$ 1,264	$ 0	$ 1,111	$ 153	$ 0	$ 2,904	$ 0	$ 2,308	$ 600	$ (4)
Long-term income tax receivable	$ (457)						$ (457)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended				9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income						$ 2,591	$ 2,910	$ 2,570
Net income (loss) attributable to parent						2,568	2,870	2,542
Adjustments to reconcile net income to net cash flows from operating activities:
Gain (Loss) on Investments						538	(14)	(10)
Other Nonrecurring (Income) Expense						56	455	62
Depreciation and amortization						2,984	2,646	2,591
Deferred income taxes and amortization of investment tax credits						8	19	1,090
Allowance for equity funds						(104)	(76)	(158)
Equity (income) loss, net of distributions						(43)	151	(123)
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions						45	260	(67)
Changes in regulatory assets and liabilities						196	31	(34)
Other, net						67	12	(132)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(72)	74	110
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						27	(22)	32
Pension and other postretirement benefit plans						(54)	(91)	(79)
Accrued property, income and other taxes						199	(28)	377
Accounts payable and other liabilities						145	50	(28)
Net cash flows from operating activities						6,770	6,078	6,104
Cash flows from investing activities:
Capital expenditures						(6,241)	(4,571)	(5,090)
Acquisitions, net of cash acquired						(106)	(1,113)	(66)
Purchases of marketable securities						(329)	(190)	(141)
Proceeds from sales of marketable securities						287	202	191
Equity method investments						(683)	(395)	(596)
Other, net						83	(12)	(34)
Net cash flows from investing activities						(6,989)	(6,079)	(5,736)
Cash flows from financing activities:
Proceeds from BHE senior debt						3,166	0	0
Repayments of BHE senior debt and junior subordinated debentures						(1,045)	(2,323)	(2,000)
Payments for Repurchase of Common Stock						(107)	(19)	0
Proceeds from subsidiary debt						2,352	1,763	2,327
Repayments of subsidiary debt						(2,422)	(1,000)	(1,831)
Net proceeds from (repayments of) short-term debt						(1,946)	2,361	879
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(435)	0
Business acquisition, acquisition of remaining noncontrolling interest						(131)	0	0
Other, net						(41)	(73)	(65)
Net cash flows from financing activities						(174)	274	(690)
Effect of exchange rate changes						(7)	7	(7)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(400)	280	(329)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		$ 1,283		$ 1,003	$ 1,003	1,283	1,003	1,332
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 883		$ 1,283			883	1,283	1,003	$ 1,332
Parent Company [Member]
Cash flows from operating activities:
Net income						2,571	2,873	2,545
Net income (loss) attributable to parent						2,568	2,870	2,542
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization						4	4	4
Equity (income) loss, net of distributions						(3,058)	(3,441)	(2,805)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Net cash flows from operating activities						1,885	2,450	2,760
Cash flows from investing activities:
Investments in subsidiaries						1,791	1,566	1,080
Purchases of marketable securities						(44)	(71)	(24)
Proceeds from sales of marketable securities						45	68	20
Repayment of (Issuance of) Notes Receivable with Related Parties, Net						(72)	(305)	(307)
Other, net						(22)	(8)	(5)
Net cash flows from investing activities						(1,884)	(1,882)	(1,396)
Cash flows from financing activities:
Proceeds from BHE senior debt						3,166	0	0
Payments for Repurchase of Common Stock						(107)	(19)	0
Net proceeds from (repayments of) short-term debt						(2,348)	2,498	581
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(406)	0
Notes payable to affiliate, net						0	0	69
Other, net						(4)	(5)	(4)
Net cash flows from financing activities						(338)	(255)	(1,354)
Net change in cash and cash equivalents and restricted cash and cash equivalents						(337)	313	10
MidAmerican Energy Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent	(13)	106	(19)	105		682	605	542
Adjustments to reconcile net income to net cash flows from operating activities:
Utilities Operating Expense, Depreciation and Amortization						609	500	479
Amortization of Utility Plant to Other Operating Expense						34	34	37
Deferred income taxes and amortization of investment tax credits						33	332	361
Allowance for equity funds						(53)	(41)	(19)
Other, net						13	(15)	(62)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						25	60	60
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						(1)	2	5
Increase (Decrease) in Inventories						41	19	(27)
Pension and other postretirement benefit plans						(13)	(11)	(6)
Accrued property, income and other taxes						218	(41)	107
Accounts payable and other liabilities						(30)	72	46
Net cash flows from operating activities						1,508	1,396	1,403
Cash flows from investing activities:
Capital expenditures						(2,332)	(1,773)	(1,636)
Purchases of marketable securities						(263)	(143)	(138)
Proceeds from sales of marketable securities						223	137	158
Proceeds from Sales of Business, Affiliate and Productive Assets						17	2	0
Increase (Decrease) in Restricted Cash and Investments						(15)	(1)	0
Other, net						30	0	11
Net cash flows from investing activities						(2,310)	(1,776)	(1,605)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						687	990	62
Net proceeds from (repayments of) short-term debt						240	(99)	99
Repayments of Long-term Debt						(350)	(255)	(38)
Other, net						(1)	0	0
Net cash flows from financing activities						576	636	123
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(226)	256	(79)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		282		26	26	282	26	105
Cash and cash equivalents and restricted cash and cash equivalents at end of period	56		282			56	282	26	105
PacifiCorp [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent						738	768	763	695
Adjustments to reconcile net income to net cash flows from operating activities:
Utilities Operating Expense, Depreciation and Amortization						979	796	770
Deferred income taxes and amortization of investment tax credits						(199)	70	139
Allowance for equity funds						(35)	(20)	(27)
Changes in regulatory assets and liabilities						87	18	122
Other, net						5	9	4
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(31)	(75)	(6)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						15	(6)	6
Increase (Decrease) in Inventories						16	10	(21)
Increase (Decrease) in Prepaid Expense						31	(8)	(5)
Accrued property, income and other taxes						60	(48)	0
Accounts payable and other liabilities						83	(62)	(163)
Net cash flows from operating activities						1,811	1,602	1,594
Cash flows from investing activities:
Capital expenditures						(1,257)	(769)	(903)
Other, net						5	12	8
Net cash flows from investing activities						(1,252)	(757)	(895)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						593	0	0
Net proceeds from (repayments of) short-term debt						(50)	(190)	250
Repayments of long-term debt and capital lease obligations (PacifiCorp)						(588)	(58)	(68)
Common stock dividends						(450)	(600)	(875)
Other, net						(1)	(1)	(1)
Net cash flows from financing activities						(496)	(849)	(694)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						63	(4)	5
Cash and cash equivalents and restricted cash and cash equivalents at end of period		29		33	33	29	33	28
Cash and cash equivalents and restricted cash and cash equivalents at end of period	92		29			92	29	33	28
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash flows from operating activities:
Net income (loss) attributable to parent	(16)	103	(42)	102	383	669	574	532
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	29	0
Utilities Operating Expense, Depreciation and Amortization						609	500	479
Amortization of Utility Plant to Other Operating Expense						34	34	37
Deferred income taxes and amortization of investment tax credits						32	334	362
Allowance for equity funds						(53)	(41)	(19)
Other, net						16	(14)	(63)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						19	62	60
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						(1)	2	5
Increase (Decrease) in Inventories						41	19	(27)
Pension and other postretirement benefit plans						(13)	(11)	(6)
Accrued property, income and other taxes						230	(54)	107
Accounts payable and other liabilities						(29)	70	46
Net cash flows from operating activities						1,516	1,380	1,393
Cash flows from investing activities:
Capital expenditures						(2,332)	(1,773)	(1,636)
Purchases of marketable securities						(263)	(143)	(138)
Proceeds from sales of marketable securities						223	137	158
Proceeds from Sales of Business, Affiliate and Productive Assets						17	2	2
Increase (Decrease) in Restricted Cash and Investments						(15)	(1)	0
Other, net						30	(3)	10
Net cash flows from investing activities						(2,310)	(1,779)	(1,604)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						687	990	62
Net proceeds from (repayments of) short-term debt						240	(99)	99
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(29)	0
Repayments of Long-term Debt						(350)	(341)	(38)
Increase (Decrease) in Notes Payable, Related Parties, Current						(8)	133	9
Other, net						0	0	1
Net cash flows from financing activities						569	654	133
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(225)	255	(78)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		282		27	27	282	27	105
Cash and cash equivalents and restricted cash and cash equivalents at end of period	57		282			57	282	27	105
Nevada Power Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent	(2)	0	(8)	10		226	255	279
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	(1)	1
Utilities Operating Expense, Depreciation and Amortization						337	308	303
Deferred income taxes and amortization of investment tax credits						(13)	94	78
Allowance for equity funds						(3)	(1)	(2)
Changes in regulatory assets and liabilities						83	50	131
Deferred Energy Change						(11)	(16)	(21)
Amortization Income (Expense) of Deferred Energy						16	16	(107)
Other, net						14	(3)	0
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(5)	(6)	(26)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Inventories						(1)	6	7
Accrued property, income and other taxes						(35)	(26)	63
Accounts payable and other liabilities						1	(23)	13
Net cash flows from operating activities						619	665	771
Cash flows from investing activities:
Capital expenditures						(298)	(270)	(335)
Payments for Previous Acquisition						0	(77)	0
Proceeds from Sale of Other Property, Plant, and Equipment						1	4	0
Net cash flows from investing activities						(297)	(343)	(335)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						573	91	0
Repayments of Long-term Debt						(840)	(89)	(224)
Common stock dividends						0	(548)	(469)
Net cash flows from financing activities						(267)	(546)	(693)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						55	(224)	(257)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		66		290	290	66	290	547
Cash and cash equivalents and restricted cash and cash equivalents at end of period	121		66			121	66	290	547
Sierra Pacific Power Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent						92	109	84
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	0	5
Utilities Operating Expense, Depreciation and Amortization						119	114	118
Deferred income taxes and amortization of investment tax credits						7	55	49
Allowance for equity funds						(4)	(4)	1
Changes in regulatory assets and liabilities						42	17	(17)
Deferred Energy Change						9	(20)	53
Amortization Income (Expense) of Deferred Energy						(10)	(47)	(54)
Other, net						0	(4)	0
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(3)	(4)	(7)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Inventories						(4)	(3)	(6)
Accrued property, income and other taxes						3	1	(3)
Accounts payable and other liabilities						18	(41)	6
Net cash flows from operating activities						275	181	243
Cash flows from investing activities:
Capital expenditures						(205)	(186)	(194)
Net cash flows from investing activities						(205)	(186)	(194)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						0	0	1,089
Repayments of Long-term Debt						(2)	(2)	(1,138)
Common stock dividends						0	(45)	(51)
Net cash flows from financing activities						(2)	(47)	(100)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						68	(52)	(51)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		$ 8		$ 60	$ 60	8	60	111
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 76		$ 8			$ 76	$ 8	$ 60	$ 111

Schedule I Condensed Balance Sh

Schedule I Condensed Balance Sheets (Paranthetical) - $ / shares shares in Millions	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77

Organization and Operations (No

Organization and Operations (Notes)	12 Months Ended
	Dec. 31, 2018
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations Berkshire Hathaway Energy Company (" BHE ") is a holding company that owns a highly diversified portfolio of locally managed businesses principally engaged in the energy industry (collectively with its subsidiaries, the "Company") and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The Company's operations are organized as eight business segments: PacifiCorp , MidAmerican Funding, LLC (" MidAmerican Funding ") (which primarily consists of MidAmerican Energy Company (" MidAmerican Energy ")), NV Energy, Inc. (" NV Energy ") (which primarily consists of Nevada Power Company (" Nevada Power ") and Sierra Pacific Power Company (" Sierra Pacific ")), Northern Powergrid Holdings Company (" Northern Powergrid ") (which primarily consists of Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc), BHE Pipeline Group (which consists of Northern Natural Gas Company (" Northern Natural Gas ") and Kern River Gas Transmission Company (" Kern River ")), BHE Transmission (which consists of BHE Canada Holdings Corporation (" AltaLink ") (which primarily consists of AltaLink, L.P. ("ALP")) and BHE U.S. Transmission, LLC ), BHE Renewables and HomeServices of America, Inc. (collectively with its subsidiaries, "HomeServices"). The Company, through these locally managed and operated businesses, owns four utility companies in the United States serving customers in 11 states, two electricity distribution companies in Great Britain, two interstate natural gas pipeline companies in the United States, an electric transmission business in Canada, interests in electric transmission businesses in the United States, a renewable energy business primarily investing in wind, solar, geothermal and hydroelectric projects, the second largest residential real estate brokerage firm in the United States and one of the largest residential real estate brokerage franchise networks in the United States.
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations PacifiCorp, which includes PacifiCorp and its subsidiaries, is a United States regulated electric utility company serving retail customers, including residential, commercial, industrial, irrigation and other customers in portions of Utah, Oregon, Wyoming, Washington, Idaho and California. PacifiCorp owns, or has interests in, a number of thermal, hydroelectric, wind-powered and geothermal generating facilities, as well as electric transmission and distribution assets. PacifiCorp also buys and sells electricity on the wholesale market with other utilities, energy marketing companies, financial institutions and other market participants. PacifiCorp is subject to comprehensive state and federal regulation. PacifiCorp's subsidiaries support its electric utility operations by providing coal mining services. PacifiCorp is an indirect subsidiary of Berkshire Hathaway Energy Company ("BHE"), a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations MidAmerican Energy Company ("MidAmerican Energy") is a public utility with electric and natural gas operations and is the principal subsidiary of MHC Inc. ("MHC"). MHC is a holding company that conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's nonregulated subsidiaries include Midwest Capital Group, Inc. and MEC Construction Services Co. MHC is the direct wholly owned subsidiary of MidAmerican Funding, LLC, ("MidAmerican Funding"), which is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations MidAmerican Funding, LLC ("MidAmerican Funding") is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). MidAmerican Funding's direct wholly owned subsidiary is MHC Inc. ("MHC"), which constitutes substantially all of MidAmerican Funding's assets, liabilities and business activities except those related to MidAmerican Funding's long-term debt securities. MHC conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's principal subsidiary is MidAmerican Energy Company ("MidAmerican Energy"), a public utility with electric and natural gas operations. Direct, wholly owned nonregulated subsidiaries of MHC are Midwest Capital Group, Inc. ("Midwest Capital Group") and MEC Construction Services Co.
Nevada Power Company [Member]
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations Nevada Power Company , together with its subsidiaries (" Nevada Power "), is a wholly owned subsidiary of NV Energy, Inc. (" NV Energy "), a holding company that also owns Sierra Pacific Power Company (" Sierra Pacific ") and certain other subsidiaries. Nevada Power is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers primarily in Las Vegas, North Las Vegas, Henderson and adjoining areas. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company (" BHE "). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Organization and Operations	Organization and Operations Sierra Pacific Power Company (" Sierra Pacific ") is a wholly owned subsidiary of NV Energy, Inc. (" NV Energy "), a holding company that also owns Nevada Power Company (" Nevada Power ") and certain other subsidiaries. Sierra Pacific is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers and regulated retail natural gas customers primarily in northern Nevada. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company (" BHE "). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2018
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of BHE and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. The Consolidated Statements of Operations include the revenue and expenses of any acquired entities from the date of acquisition. Intercompany accounts and transactions have been eliminated. Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; impairment of goodwill; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; fair value of assets acquired and liabilities assumed in business combinations; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements. Accounting for the Effects of Certain Types of Regulation PacifiCorp, MidAmerican Energy, Nevada Power, Sierra Pacific, Northern Natural Gas, Kern River and ALP (the "Regulated Businesses") prepare their financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, the Regulated Businesses defer the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. The Company continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit the Regulated Businesses' ability to recover their costs. The Company believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at the federal, state and provincial levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be recognized in net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI"). Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Alternative valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements and debt service obligations for certain of the Company's nonregulated renewable energy projects. Restricted amounts are included in restricted cash and cash equivalents and investments and restricted cash and cash equivalents and investments on the Consolidated Balance Sheets. Investments Fixed Maturity Securities The Company's management determines the appropriate classification of investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments and restricted cash and cash equivalents and investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Consolidated Balance Sheets. Available-for-sale investments are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on fixed maturity securities in a trust related to the decommissioning of nuclear generation assets are recorded as a net regulatory liability since the Company expects to recover costs for these activities through regulated rates. Trading investments are carried at fair value with changes in fair value recognized in earnings. Held-to-maturity investments are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. Investment gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired with respect to securities classified as available-for-sale. If the value of a fixed maturity investment declines to below amortized cost and the decline is deemed other than temporary, the amortized cost of the investment is reduced to fair value, with a corresponding charge to earnings. Any resulting impairment loss is recognized in earnings if the Company intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If the Company does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated fixed maturity investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable. Equity Securities Beginning January 1, 2018, investments in equity securities are carried at fair value with changes in fair value recognized in earnings as a component of gains (losses) on marketable securities, net. Prior to January 1, 2018, substantially all of the Company's equity security investments were classified as available-for-sale with changes in fair value recognized in OCI, net of income taxes. All changes in fair value of equity securities in a trust related to the decommissioning of nuclear generation assets are recorded as a net regulatory liability since the Company expects to recover costs for these activities through regulated rates. Equity Method Investments The Company utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when the investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, the Company records the investment at cost and subsequently increases or decreases the carrying value of the investment by the Company's share of the net earnings or losses and OCI of the investee. The Company records dividends or other equity distributions as reductions in the carrying value of the investment. Certain equity investments are presented on the Consolidated Balance Sheets net of related investment tax credits. Allowance for Doubtful Accounts Trade receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on the Company's assessment of the collectibility of amounts owed to the Company by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2018 and 2017 , the allowance for doubtful accounts totaled $42 million and $40 million , respectively, and is included in trade receivables, net on the Consolidated Balance Sheets. Derivatives The Company employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price, interest rate, and foreign currency exchange rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Consolidated Balance Sheets. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or cost of sales on the Consolidated Statements of Operations. For the Company's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For the Company's derivatives not designated as hedging contracts and for which changes in fair value are not recorded as regulatory assets and liabilities, unrealized gains and losses are recognized on the Consolidated Statements of Operations as operating revenue for sales contracts; cost of sales and operating expense for purchase contracts and electricity, natural gas and fuel swap contracts; and other, net for interest rate swap derivatives. For the Company's derivatives designated as hedging contracts, the Company formally assesses, at inception and thereafter, whether the hedging contract is highly effective in offsetting changes in the hedged item. The Company formally documents hedging activity by transaction type and risk management strategy. Changes in the estimated fair value of a derivative contract designated and qualified as a cash flow hedge, to the extent effective, are included on the Consolidated Statements of Changes in Equity as AOCI, net of tax, until the contract settles and the hedged item is recognized in earnings. The Company discontinues hedge accounting prospectively when it has determined that a derivative contract no longer qualifies as an effective hedge, or when it is no longer probable that the hedged forecasted transaction will occur. When hedge accounting is discontinued because the derivative contract no longer qualifies as an effective hedge, future changes in the estimated fair value of the derivative contract are charged to earnings. Gains and losses related to discontinued hedges that were previously recorded in AOCI will remain in AOCI until the contract settles and the hedged item is recognized in earnings, unless it becomes probable that the hedged forecasted transaction will not occur at which time associated deferred amounts in AOCI are immediately recognized in earnings. Inventories Inventories consist mainly of fuel, which includes coal stocks, stored gas and fuel oil, totaling $273 million and $352 million as of December 31, 2018 and 2017 , respectively, and materials and supplies totaling $571 million and $536 million as of December 31, 2018 and 2017 , respectively. The cost of materials and supplies, coal stocks and fuel oil is determined primarily using the average cost method. The cost of stored gas is determined using either the last-in-first-out ("LIFO") method or the lower of average cost or market. With respect to inventories carried at LIFO cost, the replacement cost would be $14 million and $22 million higher as of December 31, 2018 and 2017 , respectively. Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. The Company capitalizes all construction-related materials, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include capitalized interest, including debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable to the Regulated Businesses. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by the Company's various regulatory authorities. Depreciation studies are completed by the Regulated Businesses to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally when the Company retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, is capitalized by the Regulated Businesses as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC") and the Alberta Utilities Commission ("AUC"). After construction is completed, the Company is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Asset Retirement Obligations The Company recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. The Company's AROs are primarily related to the decommissioning of nuclear generating facilities and obligations associated with its other generating facilities and offshore natural gas pipelines. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. For the Regulated Businesses, the difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability. Impairment The Company evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. The impacts of regulation are considered when evaluating the carrying value of regulated assets. Goodwill Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. The Company evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, the Company estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. The Company uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, the Company incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2018 , 2017 and 2016 , the Company did not record any material goodwill impairments. The Company records goodwill adjustments for (a) the tax benefit associated with the excess of tax-deductible goodwill over the reported amount of goodwill and (b) changes to the purchase price allocation prior to the end of the measurement period, which is not to exceed one year from the acquisition date. Revenue Recognition Customer Revenue The Company uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The Company records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. In the event one of the parties to a contract has performed before the other, the Company would recognize a contract asset or contract liability depending on the relationship between the Company's performance and the customer's payment. Energy Products and Services A majority of the Company's energy revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. The Company's energy revenue that is nonregulated primarily relates to the Company's renewable energy business. Revenue recognized is equal to what the Company has the right to invoice as it corresponds directly with the value to the customer of the Company's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and 2017 , trade receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $554 million and $665 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued. Real Estate Services The Company's HomeServices reportable segment consists of separate brokerage, mortgage and franchise businesses. Rates charged for brokerage, mortgage and franchise real estate services are established through contractual arrangements that establish the transaction price and the allocation of the price amongst the separate performance obligations. The full-service residential real estate brokerage business has performance obligations to deliver integrated real estate services including brokerage services, title and closing services, property and casualty insurance, home warranties, relocation services, and other home-related services to customers. All performance obligations related to the full-service residential real estate brokerage business are satisfied in less than one year at the point in time when a real estate transaction is closed or when services are provided. Commission revenue from real estate brokerage transactions and related amounts due to agents are recognized when a real estate transaction is closed. Title and escrow closing fee revenue from real estate transactions and related amounts due to the title insurer are recognized at closing. Payments for amounts billed are generally due from the customer at closing. The franchise business operates a network that has performance obligations to provide the right to use certain brand names and other related service marks as well as to provide orientation programs, training and consultation services, advertising programs and other services to its franchisees. The performance obligations related to the franchise business are satisfied over time or when the services are provided. Franchise royalty fees are sales-based variable consideration and are based on a percentage of commissions earned by franchisees on real estate sales, which are recognized when the sale closes. Meetings and training revenue, referral fees, late fees, service fees and franchise termination fees are earned when services have been completed. Payments for amounts billed are generally due from the franchisee within 30 days of billing. Other Revenue Energy Products and Services Other revenue consists primarily of revenue related to power purchase agreements not considered Customer Revenue as they are recognized in accordance with Accounting Standards Codification ("ASC") 815, "Derivatives and Hedging" and ASC 840, "Leases" and certain non tariff-based revenue approved by the regulator that is not considered Customer Revenue within ASC 606, "Revenue from Contracts with Customers." Real Estate Service Other revenue consists primarily of revenue related to the mortgage business. Mortgage fee revenue consists of amounts earned related to application and underwriting fees, and fees on canceled loans. Fees associated with the origination and acquisition of mortgage loans are recognized as earned. These amounts are not considered Customer Revenue as they are recognized in accordance with ASC 815, "Derivatives and Hedging," ASC 825, "Financial Instruments" and ASC 860, "Transfers and Servicing." Unamortized Debt Premiums, Discounts and Debt Issuance Costs Premiums, discounts and debt issuance costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method. Foreign Currency The accounts of foreign-based subsidiaries are measured in most instances using the local currency of the subsidiary as the functional currency. Revenue and expenses of these businesses are translated into United States dollars at the average exchange rate for the period. Assets and liabilities are translated at the exchange rate as of the end of the reporting period. Gains or losses from translating the financial statements of foreign-based operations are included in equity as a component of AOCI. Gains or losses arising from transactions denominated in a currency other than the functional currency of the entity that is party to the transaction are included in earnings. Income Taxes The Company's provision for income taxes has been computed on a stand-alone basis. Berkshire Hathaway includes the Company in its consolidated United States federal and Iowa state income tax returns and substantially all of the Company's United States federal income tax is remitted to or received from Berkshire Hathaway. The Company records the deferred income tax assets associated with the state of Iowa net operating loss carryforward as a long-term income tax receivable from Berkshire Hathaway as a component of BHE's shareholders' equity due to the long-term related-party nature of the income tax receivable. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities associated with income tax benefits and expense for certain property-related basis differences and other various differences that the Company's regulated businesses deems probable to be passed on to their customers in most state and provincial jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions. The Company has not established deferred income taxes on its undistributed foreign earnings that have been determined by management to be reinvested indefinitely; however, the Company periodically evaluates its capital requirements. If circumstances change in the future and a portion of the Company's undistributed foreign earnings were repatriated, the dividends may be subject to taxation in the United States but the tax is not expected to be material. In determining the Company's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by the Company's various regulatory commissions. The Company's income tax returns are subject to continuous examinations by federal, state, local and foreign income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. The Company recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of the Company's federal, state, local and foreign income tax examinations is uncertain, the Company believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on the Company's consolidated financial results. The Company's unrecognized tax benefits are primarily included in accrued property, income and other taxes and other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations. New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. The Company elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, which amends FASB ASC Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity's ability to hedge non-financial
PacifiCorp [Member]
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of PacifiCorp and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated. Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements. Accounting for the Effects of Certain Types of Regulation PacifiCorp prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, PacifiCorp defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in rates occur. PacifiCorp continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit PacifiCorp's ability to recover its costs. PacifiCorp believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future rates, the related regulatory assets and liabilities will be written off to net income or re-established as accumulated other comprehensive income (loss) ("AOCI"). Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents consist substantially of funds representing escrow accounts for disputes, vendor retention, custodial and nuclear decommissioning funds. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets. Investments Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. As of December 31, 2018 and 2017 , PacifiCorp had no unrealized gains and losses on available-for-sale securities. Trading securities are carried at fair value with realized and unrealized gains and losses recognized in earnings. Equity Method Investments PacifiCorp utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when an investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, PacifiCorp records the investment at cost and subsequently increases or decreases the carrying value of the investment by PacifiCorp's proportionate share of the net earnings or losses and other comprehensive income (loss) ("OCI") of the investee. PacifiCorp records dividends or other equity distributions as reductions in the carrying value of the investment. Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on PacifiCorp's assessment of the collectability of amounts owed to PacifiCorp by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 10 $ 7 $ 7 Charged to operating costs and expenses, net 12 15 12 Write-offs, net (14 ) (12 ) (12 ) Ending balance $ 8 $ 10 $ 7 Derivatives PacifiCorp employs a number of different derivative contracts, which may include forwards, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or energy costs on the Consolidated Statements of Operations. For PacifiCorp's derivative contracts, the settled amount is generally included in rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in rates are recorded as regulatory liabilities or assets. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings. Inventories Inventories consist mainly of materials, supplies and fuel stocks and are stated at the lower of average cost or net realizable value. Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. PacifiCorp capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs, which include debt and equity allowance for funds used during construction ("AFUDC"). The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Depreciation and amortization are generally computed on the straight-line method based on composite asset class lives prescribed by PacifiCorp's various regulatory authorities or over the assets' estimated useful lives. Depreciation studies are completed periodically to determine the appropriate composite asset class lives, net salvage and depreciation rates. These studies are reviewed and rates are ultimately approved by the various regulatory authorities. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally when PacifiCorp retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of property, plant and equipment, is capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, PacifiCorp is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Asset Retirement Obligations PacifiCorp recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. PacifiCorp's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability. Impairment PacifiCorp evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. The impacts of regulation are considered when evaluating the carrying value of regulated assets. Revenue Recognition PacifiCorp uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which PacifiCorp expects to be entitled in exchange for those goods or services. PacifiCorp records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. Substantially all of PacifiCorp's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission and distribution and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with ASC 815, "Derivatives and Hedging." Revenue recognized is equal to what PacifiCorp has the right to invoice as it corresponds directly with the value to the customer of PacifiCorp's performance to date and includes billed and unbilled amounts. As of December 31 , 2018 and December 31, 2017 , trade receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $229 million and $255 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued. Income Taxes Berkshire Hathaway includes PacifiCorp in its consolidated United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that PacifiCorp deems probable to be passed on to its customers in most state jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse or as otherwise approved by PacifiCorp's various regulatory commissions. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions. Investment tax credits are included in other long-term liabilities on the Consolidated Balance Sheets and were $13 million and $16 million as of December 31, 2018 and 2017 , respectively. In determining PacifiCorp's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by PacifiCorp's various regulatory commissions. PacifiCorp's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. PacifiCorp recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of PacifiCorp's federal, state and local income tax examinations is uncertain, PacifiCorp believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on PacifiCorp's consolidated financial results. PacifiCorp's unrecognized tax benefits are primarily included in other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations. Segment Information PacifiCorp currently has one segment, which includes its regulated electric utility operations. New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. PacifiCorp elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on PacifiCorp's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. PacifiCorp adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations utilizing the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the year-ended December 31, 2017 and 2016 of $22 million of benefit and $2 million of cost, respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. PacifiCorp adopted this guidance retrospectively January 1, 2018. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. PacifiCorp adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $27 million and $25 million previously recognized within investing cash flows to operating cash flows for the years ended December 31, 2017 and 2016 . In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp adopted this guidance, electing all practical expedients, effective January 1, 2019, for all contracts currently in-effect. PacifiCorp is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. PacifiCorp currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within the Notes to the Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. PacifiCorp adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method. The adoption did not have a cumulative effect impact at the date of initial adoption.
MidAmerican Energy Company [Member]
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Use of Estimates in Preparation of Financial Statements The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements. A ccounting for the Effects of Certain Types of Regulation MidAmerican Energy's utility operations are subject to the regulation of the Iowa Utilities Board ("IUB"), the Illinois Commerce Commission ("ICC"), the South Dakota Public Utilities Commission, and the Federal Energy Regulatory Commission ("FERC"). MidAmerican Energy's accounting policies and the accompanying Financial Statements conform to GAAP applicable to rate-regulated enterprises and reflect the effects of the ratemaking process. MidAmerican Energy prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, MidAmerican Energy defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. MidAmerican Energy continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition, that could limit MidAmerican Energy's ability to recover its costs. MidAmerican Energy believes the application of the guidance for regulated operations is appropriate, and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI"). Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents is comprised of funds restricted for the purpose of constructing solid waste facilities under tax exempt bond agreements. Restricted amounts are included in other current assets and investments and restricted investments on the Balance Sheets. Investments Fixed Maturity Securities MidAmerican Energy's management determines the appropriate classification of investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Balance Sheets. Available-for-sale investments are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on fixed maturity securities in a trust related to the decommissioning of the Quad Cities Generating Station Units 1 and 2 ("Quad Cities Station") are recorded as a net regulatory liability because MidAmerican Energy expects to recover costs for these activities through regulated rates. Trading investments are carried at fair value with changes in fair value recognized in earnings. Held-to-maturity securities are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. Investments gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired with respect to securities classified as available-for-sale. If the value of a fixed maturity investment declines to below amortized cost and the decline is deemed other than temporary, the amortized cost of the investment is reduced to fair value, with a corresponding charge to earnings. Any resulting impairment loss is recognized in earnings if MidAmerican Energy intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If MidAmerican Energy does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable. Equity Securities All changes in fair value of equity securities in a trust related to the decommissioning of nuclear generation assets are recorded as a net regulatory liability since MidAmerican Energy expects to recover costs for these activities through regulated rates. Allowance for Doubtful Accounts Receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on MidAmerican Energy's assessment of the collectibility of amounts owed to it by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2018 and 2017 , the allowance for doubtful accounts totaled $7 million and is included in receivables, net on the Balance Sheets. Derivatives MidAmerican Energy employs a number of different derivative contracts, including forwards, futures, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities, and interest rate risk. Derivative contracts are recorded on the Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Balance Sheets. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked to market, and settled amounts are recognized as operating revenue or cost of sales on the Statements of Operations. For MidAmerican Energy's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. Inventories Inventories consist mainly of coal stocks, totaling $51 million and $117 million as of December 31, 2018 and 2017 , respectively, materials and supplies, totaling $124 million and $100 million as of December 31, 2018 and 2017 , respectively, and natural gas in storage, totaling $24 million as of December 31, 2018 and 2017 . The cost of materials and supplies, coal stocks and fuel oil is determined using the average cost method. The cost of stored natural gas is determined using the last-in-first-out method. With respect to stored natural gas, the replacement cost would be $14 million and $22 million higher as of December 31, 2018 and 2017 , respectively. Utility Plant, Net General Additions to utility plant are recorded at cost. MidAmerican Energy capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC") and equity AFUDC. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds and retail energy benefits associated with certain wind-powered generation. Amounts expensed under this arrangement are included as a component of depreciation and amortization. Depreciation and amortization for MidAmerican Energy's utility operations are computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by its various regulatory authorities. Depreciation studies are completed by MidAmerican Energy to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally, when MidAmerican Energy retires or sells a component of utility plant, it charges the original cost, net of any proceeds from the disposition to accumulated depreciation. Any gain or loss on disposals of nonregulated assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of its regulated facilities, is capitalized by MidAmerican Energy as a component of utility plant, with offsetting credits to the Statements of Operations. AFUDC is computed based on guidelines set forth by the FERC. After construction is completed, MidAmerican Energy is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Asset Retirement Obligations MidAmerican Energy recognizes AROs when it has a legal obligation to perform decommissioning or removal activities upon retirement of an asset. MidAmerican Energy's AROs are primarily related to decommissioning of the Quad Cities Station and obligations associated with its other generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to utility plant) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in utility plant, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability. Impairment MidAmerican Energy evaluates long-lived assets for impairment, including utility plant, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value. The impacts of regulation are considered when evaluating the carrying value of regulated assets. For all other assets, any resulting impairment loss is reflected on the Statements of Operations. Revenue Recognition MidAmerican Energy uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which MidAmerican Energy expects to be entitled in exchange for those goods and services. MidAmerican Energy records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Statements of Operations. A majority of MidAmerican Energy's energy revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with Accounting Standards Codification ("ASC") 840, "Leases" and amounts not considered Customer Revenue within ASC 606. Revenue from electric and natural gas customers is recognized as electricity or natural gas is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2018 and 2017 , unbilled revenue was $88 million and $89 million , respectively, and is included in receivables, net on the Balance Sheets. The determination of customer billings is based on a systematic reading of customer meters and applicable rates. At the end of each month, amounts of energy provided to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recorded. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns, total volumes supplied to the system, line losses, economic impacts and composition of customer classes. Unbilled revenue is reversed in the following month and billed revenue is recorded based on the subsequent meter readings. All of MidAmerican Energy's regulated retail electric and natural gas sales are subject to energy adjustment clauses. MidAmerican Energy also has costs that are recovered, at least in part, through bill riders, including demand-side management and certain transmission costs. The clauses and riders allow MidAmerican Energy to adjust the amounts charged for electric and natural gas service as the related costs change. The costs recovered in revenue through use of the adjustment clauses and bill riders are charged to expense in the same year the related revenue is recognized. At any given time, these costs may be over or under collected from customers. The total under collection included in receivables at December 31, 2018 and 2017 , was $56 million and $72 million , respectively. Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and issuance costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method. Income Taxes Berkshire Hathaway includes MidAmerican Funding and MidAmerican Energy in its consolidated United States federal and Iowa state income tax returns. MidAmerican Funding's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that MidAmerican Energy deems probable to be passed on to its customers in most state jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions. In determining MidAmerican Funding's and MidAmerican Energy's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by MidAmerican Energy's various regulatory commissions. MidAmerican Funding's and MidAmerican Energy's income tax returns are subject to continuous examinations by federal, state and local tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. MidAmerican Funding and MidAmerican Energy recognize the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of their federal, state and local income tax examinations is uncertain, each company believes it has made adequate provisions for its income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on its consolidated financial results. MidAmerican Funding's and MidAmerican Energy's unrecognized tax benefits are primarily included in taxes accrued and other long-term liabilities on their respective Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations. New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy elected to early adopt ASU No. 2018-14 for period ending December 31, 2018. The adoption did not have a material impact on MidAmerican Energy's Financial Statements and disclosures included within Notes to Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. MidAmerican Energy adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, for the years ended December 31, 2017 and 2016, amounts other than the service cost for pension and other postretirement benefit plans totaling $20 million and $15 million , respectively, have been reclassified to Other, net in the Statements of Operations of participating subsidiaries, of which $18 million and $15 million , respectively, relates to MidAmerican Energy. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy adopted this guidance effective January 1, 2019, for all contracts currently in-effect. MidAmerican Energy is finalizing its implementation efforts relative to the new guidance and currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. MidAmerican Energy adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies In addition to the following significant accounting policies, refer to Note 2 of MidAmerican Energy's Notes to Financial Statements for significant accounting policies of MidAmerican Funding. Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of MidAmerican Funding and its subsidiaries in which it held a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated, other than those between rate-regulated operations. Goodwill Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired when MidAmerican Funding purchased MHC. MidAmerican Funding evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, MidAmerican Funding estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. MidAmerican Funding uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, MidAmerican Funding incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2018 , 2017 and 2016 , MidAmerican Funding did not record any goodwill impairments.
Nevada Power Company [Member]
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of Nevada Power and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the years ended December 31, 2018 , 2017 and 2016 . Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements. Accounting for the Effects of Certain Types of Regulation Nevada Power prepares its Consolidated Financial Statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, Nevada Power defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. Nevada Power continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit Nevada Power 's ability to recover its costs. Nevada Power believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss). Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. Cash Equivalents and Restricted Cash and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets. Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on Nevada Power 's assessment of the collectibility of amounts owed to Nevada Power by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. Nevada Power also has the ability to assess deposits on customers who have delayed payments or who are deemed to be a credit risk. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 16 $ 12 $ 13 Charged to operating costs and expenses, net 15 15 16 Write-offs, net (15 ) (11 ) (17 ) Ending balance $ 16 $ 16 $ 12 Derivatives Nevada Power employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked‑to‑market and settled amounts are recognized as cost of fuel, energy and capacity on the Consolidated Statements of Operations. For Nevada Power 's derivative contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings. Inventories Inventories consist mainly of materials and supplies totaling $56 million as of December 31 , 2018 and 2017 , and fuel, which includes coal stock, stored natural gas and fuel oil, totaling $5 million and $3 million as of December 31 , 2018 and 2017 , respectively. The cost is determined using the average cost method. Materials are charged to inventory when purchased and are expensed or capitalized to construction work in process, as appropriate, when used. Fuel costs are recovered from retail customers through the base tariff energy rates and deferred energy accounting adjustment charges approved by the Public Utilities Commission of Nevada ("PUCN"). Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. Nevada Power capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. The cost of repairs and minor replacements are charged to expense when incurred with the exception of costs for generation plant maintenance under certain long-term service agreements. Costs under these agreements are expensed straight-line over the term of the agreements as approved by the PUCN. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by Nevada Power 's various regulatory authorities. Depreciation studies are completed by Nevada Power to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as a non-current regulatory liability on the Consolidated Balance Sheets. As actual removal costs are incurred, the associated liability is reduced. Generally when Nevada Power retires or sells a component of regulated property, plant and equipment depreciated using the composite method, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings with the exception of material gains or losses on regulated property, plant and equipment depreciated on a straight-line basis, which is then recorded to a regulatory asset or liability. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, are capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. The rate applied to construction costs is the lower of the PUCN allowed rate of return and rates computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, Nevada Power is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Nevada Power 's AFUDC rate used during 2018 and 2017 was 7.95% and 8.09% , respectively. Asset Retirement Obligations Nevada Power recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. Nevada Power 's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability on the Consolidated Balance Sheets. The costs are not recovered in rates until the work has been completed. Impairment of Long-Lived Assets Nevada Power evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. As substantially all property, plant and equipment was used in regulated businesses as of December 31 , 2018 , the impacts of regulation are considered when evaluating the carrying value of regulated assets. Income Taxes Berkshire Hathaway includes Nevada Power in its consolidated United States federal income tax return. Consistent with established regulatory practice, Nevada Power 's provision for income taxes has been computed on a separate return basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of other comprehensive income ("OCI") are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property‑related basis differences and other various differences that Nevada Power deems probable to be passed on to its customers are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties. In determining Nevada Power 's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by Nevada Power 's various regulatory commissions. Nevada Power 's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. Nevada Power recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of Nevada Power 's federal, state and local income tax examinations is uncertain, Nevada Power believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on Nevada Power 's consolidated financial results. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations. Revenue Recognition Nevada Power uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which Nevada Power expects to be entitled in exchange for those goods or services. Nevada Power records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. Substantially all of Nevada Power's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission and distribution and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of amounts not considered Customer Revenue within Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers" and revenue recognized in accordance with ASC 840, "Leases". Revenue recognized is equal to what Nevada Power has the right to invoice as it corresponds directly with the value to the customer of Nevada Power's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and December 31, 2017 , accounts receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $106 million and $111 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued. Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing on a straight-line basis. Segment Information Nevada Power currently has one segment, which includes its regulated electric utility operations. New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Nevada Power adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $2 million and $3 million , respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Nevada Power adopted this guidance effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Nevada Power adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power adopted this guidance effective January 1, 2019, for all contracts currently in effect. Nevada Power is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. Nevada Power currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Nevada Power adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
Sierra Pacific Power Company [Member]
Allowance for Doubtful Accounts [Line Items]
Summary of Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Basis of Presentation The Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the years ended December 31, 2018 , 2017 and 2016 . Use of Estimates in Preparation of Financial Statements The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements. Accounting for the Effects of Certain Types of Regulation Sierra Pacific prepares its Financial Statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, Sierra Pacific defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. Sierra Pacific continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit Sierra Pacific 's ability to recover its costs. Sierra Pacific believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss). Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. Cash Equivalents and Restricted Cash and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Balance Sheets. Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on Sierra Pacific 's assessment of the collectibility of amounts owed to Sierra Pacific by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. Sierra Pacific also has the ability to assess deposits on customers who have delayed payments or who are deemed to be a credit risk. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 2 $ 2 $ 1 Charged to operating costs and expenses, net 1 2 2 Write-offs, net (1 ) (2 ) (1 ) Ending balance $ 2 $ 2 $ 2 Derivatives Sierra Pacific employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price and interest rate risk. Derivative contracts are recorded on the Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked‑to‑market and settled amounts are recognized as cost of fuel, energy and capacity or natural gas purchased for resale on the Statements of Operations. For Sierra Pacific 's derivative contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings. Inventories Inventories consist mainly of materials and supplies totaling $44 million and $42 million as of December 31 , 2018 and 2017 , respectively, and fuel, which includes coal stock, stored natural gas and fuel oil, totaling $8 million and $7 million as of December 31 , 2018 and 2017 , respectively. The cost is determined using the average cost method. Materials are charged to inventory when purchased and are expensed or capitalized to construction work in process, as appropriate, when used. Fuel costs are recovered from retail customers through the base tariff energy rates and deferred energy accounting adjustment charges approved by the Public Utilities Commission of Nevada ("PUCN"). Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. Sierra Pacific capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. The cost of repairs and minor replacements are charged to expense when incurred with the exception of costs for generation plant maintenance under certain long-term service agreements. Costs under these agreements are expensed straight-line over the term of the agreements as approved by the PUCN. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by Sierra Pacific 's various regulatory authorities. Depreciation studies are completed by Sierra Pacific to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as a non-current regulatory liability on the Balance Sheets. As actual removal costs are incurred, the associated liability is reduced. Generally when Sierra Pacific retires or sells a component of regulated property, plant and equipment depreciated using the composite method, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings with the exception of material gains or losses on regulated property, plant and equipment depreciated on a straight-line basis, which is then recorded to a regulatory asset or liability. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, are capitalized as a component of property, plant and equipment, with offsetting credits to the Statements of Operations. The rate applied to construction costs is the lower of the PUCN allowed rate of return and rates computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, Sierra Pacific is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Sierra Pacific 's AFUDC rate used during 2018 and 2017 was 6.65% for electric, 5.74% and 5.63% for natural gas, respectively, and 6.55% for common facilities. Asset Retirement Obligations Sierra Pacific recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. Sierra Pacific 's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability on the Balance Sheets. The costs are not recovered in rates until the work has been completed. Impairment of Long-Lived Assets Sierra Pacific evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Statements of Operations. As substantially all property, plant and equipment was used in regulated businesses as of December 31 , 2018 , the impacts of regulation are considered when evaluating the carrying value of regulated assets. Income Taxes Berkshire Hathaway includes Sierra Pacific in its consolidated United States federal income tax return. Consistent with established regulatory practice, Sierra Pacific 's provision for income taxes has been computed on a separate return basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of other comprehensive income ("OCI") are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that Sierra Pacific deems probable to be passed on to its customers are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties. In determining Sierra Pacific 's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by Sierra Pacific 's various regulatory commissions. Sierra Pacific 's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. Sierra Pacific recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of Sierra Pacific 's federal, state and local income tax examinations is uncertain, Sierra Pacific believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on Sierra Pacific 's financial results. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Statements of Operations. Revenue Recognition Sierra Pacific uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which Sierra Pacific expects to be entitled in exchange for those goods or services. Sierra Pacific records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Statements of Operations. Substantially all of Sierra Pacific's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with ASC 840, "Leases" and amounts not considered Customer Revenue within Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers". Revenue recognized is equal to what Sierra Pacific has the right to invoice as it corresponds directly with the value to the customer of Sierra Pacific's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and December 31, 2017 , accounts receivables, net on the Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $57 million and $62 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued. Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing on a straight-line basis. New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Sierra Pacific adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $1 million and $(1) million , respectively, have been reclassified to Other, net in the Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Sierra Pacific adopted this guidance effective January 1, 2018 which did not have a material impact on its Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Sierra Pacific adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific adopted this guidance effective January 1, 2019, for all contracts currently in effect. Sierra Pacific is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $20 million based on the contracts currently in-effect. Sierra Pacific currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Sierra Pacific adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.

Business Acquisitions (Notes)

Business Acquisitions (Notes)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Acquisitions [Text Block]	Business Acquisitions In 2018, the Company completed various acquisitions totaling $106 million , net of cash acquired. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses. As a result of the various acquisitions, the Company acquired assets of $39 million , assumed liabilities of $12 million and recognized goodwill of $79 million . Additionally, in April 2018, HomeServices acquired the remaining 33.3% interest in a real estate brokerage franchise business from the noncontrolling interest member at a contractually determined option exercise price totaling $131 million . In 2017, the Company completed various acquisitions totaling $ 1.1 billion , net of cash acquired. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses, development and construction costs for the 110-megawatt ("MW") Alamo 6 and the 50-MW Pearl solar projects, and the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power. As a result of the various acquisitions, the Company acquired assets of $1.1 billion , assumed liabilities of $487 million and recognized goodwill of $508 million . In 2016, the Company completed various acquisitions totaling $66 million , net of cash acquired. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed. The assets acquired consisted of property, plant and equipment, development and construction costs for renewable projects, other working capital items, goodwill of $50 million and other identifiable intangible assets. The liabilities assumed totaled $54 million .

Property, Plant and Equipment,

Property, Plant and Equipment, Net (Notes)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 77,288 $ 74,660 Interstate natural gas pipeline assets 3-80 years 7,524 7,176 84,812 81,836 Accumulated depreciation and amortization (26,010 ) (24,478 ) Regulated assets, net 58,802 57,358 Nonregulated assets: Independent power plants 5-30 years 6,826 6,010 Other assets 3-30 years 1,498 1,489 8,324 7,499 Accumulated depreciation and amortization (1,641 ) (1,542 ) Nonregulated assets, net 6,683 5,957 Net operating assets 65,485 63,315 Construction work-in-progress 3,110 2,556 Property, plant and equipment, net $ 68,595 $ 65,871 Construction work-in-progress includes $2.9 billion and $2.2 billion as of December 31, 2018 and 2017 , respectively, related to the construction of regulated assets. During the fourth quarter of 2016, MidAmerican Energy revised its electric and gas depreciation rates based on the results of a new depreciation study, the most significant impact of which was longer estimated useful lives for certain wind-powered generating facilities. The effect of this change was to reduce depreciation and amortization expense by $3 million in 2016 and $34 million annually based on depreciable plant balances at the time of the change.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had nonregulated property gross of $24 million as of December 31, 2018 and 2017 , and related accumulated depreciation and amortization of $12 million and $10 million as of December 31, 2018 and 2017 , respectively, which consisted primarily of a corporate aircraft owned by MHC.
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant in service: Generation 20-70 years $ 13,727 $ 12,107 Transmission 52-75 years 1,934 1,838 Electric distribution 20-75 years 3,672 3,380 Natural gas distribution 29-75 years 1,726 1,640 Utility plant in service 21,059 18,965 Accumulated depreciation and amortization (5,941 ) (5,561 ) Utility plant in service, net 15,118 13,404 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 15,124 13,410 Construction work-in-progress 1,035 797 Property, plant and equipment, net $ 16,159 $ 14,207 Nonregulated property includes land, computer software and other assets not recoverable for regulated utility purposes. The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows: 2018 2017 2016 Electric 2.9 % 2.6 % 2.8 % Natural gas 2.8 % 2.7 % 2.9 % During the fourth quarter of 2016, MidAmerican Energy revised its electric and natural gas depreciation rates based on the results of a new depreciation study, the most significant impact of which was longer estimated useful lives for certain wind-powered generating facilities. The effect of this change was to reduce depreciation and amortization expense by $3 million in 2016 and $34 million annually based on depreciable plant balances at the time of the change.
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility Plant: Generation 14 - 67 years $ 12,606 $ 12,490 Transmission 58 - 75 years 6,357 6,226 Distribution 20 - 70 years 7,030 6,792 Intangible plant (1) 5 - 75 years 970 937 Other 5 - 60 years 1,483 1,435 Utility plant in service 28,446 27,880 Accumulated depreciation and amortization (10,060 ) (9,366 ) Utility plant in service, net 18,386 18,514 Other non-regulated, net of accumulated depreciation and amortization 47 years 10 11 Plant, net 18,396 18,525 Construction work-in-progress 1,195 678 Property, plant and equipment, net $ 19,591 $ 19,203 (1) Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years. The average depreciation and amortization rate applied to depreciable property, plant and equipment was 3.5% for the year ended December 31, 2018 , including the impact of accelerated depreciation for Utah's share of certain thermal plant units, and 2.9% for the years ended December 31, 2017 and 2016 , respectively. Unallocated Acquisition Adjustments PacifiCorp has unallocated acquisition adjustments that represent the excess of costs of the acquired interests in property, plant and equipment purchased from the entity that first devoted the assets to utility service over their net book value in those assets. These unallocated acquisition adjustments included in other property, plant and equipment had an original cost of $156 million as of December 31, 2018 and 2017 , respectively, and accumulated depreciation of $127 million and $122 million as of December 31, 2018 and 2017 , respectively.
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Generation 30 - 55 years $ 3,720 $ 3,707 Distribution 20 - 65 years 3,411 3,314 Transmission 45 - 70 years 1,867 1,860 General and intangible plant 5 - 65 years 848 793 Utility plant 9,846 9,674 Accumulated depreciation and amortization (3,076 ) (2,871 ) Utility plant, net 6,770 6,803 Other non-regulated, net of accumulated depreciation and amortization 45 years 1 1 Plant, net 6,771 6,804 Construction work-in-progress 97 73 Property, plant and equipment, net $ 6,868 $ 6,877 Almost all of Nevada Power 's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Nevada Power 's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31 , 2018 , 2017 and 2016 was 3.2% . Nevada Power is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. Construction work-in-progress is related to the construction of regulated assets. In January 2018, Nevada Power revised its electric depreciation rates based on the results of a new depreciation study performed in 2017, the most significant impact of which was shorter estimated useful lives at the Navajo Generating Station and longer average service lives for various other utility plant groups. The net effect of these changes increased depreciation and amortization expense by $7 million for the year ended December 31, 2018 , based on depreciable plant balances at the time of the change. Acquisitions In April 2017, Nevada Power purchased the remaining 25% interest in the Silverhawk natural gas-fueled generating facility for $77 million . The Public Utilities Commission of Nevada ("PUCN") approved the purchase of the facility in Nevada Power's triennial Integrated Resource Plan filing in December 2015. The purchase price was allocated to the assets acquired, consisting primarily of generation utility plant, and no significant liabilities were assumed.
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net [Text Block]	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Electric generation 25 - 60 years $ 1,144 $ 1,144 Electric distribution 20 - 100 years 1,568 1,459 Electric transmission 50 - 100 years 835 786 Electric general and intangible plant 5 - 70 years 197 181 Natural gas distribution 35 - 70 years 403 390 Natural gas general and intangible plant 5 - 70 years 14 14 Common general 5 - 70 years 321 294 Utility plant 4,482 4,268 Accumulated depreciation and amortization (1,593 ) (1,513 ) Utility plant, net 2,889 2,755 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,894 2,760 Construction work-in-progress 90 132 Property, plant and equipment, net $ 2,984 $ 2,892 All of Sierra Pacific 's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Sierra Pacific 's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31 , 2018 , 2017 and 2016 was 3.1% , 3.0% and 3.0% , respectively. Sierra Pacific is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. Construction work-in-progress is related to the construction of regulated assets. In January 2017, Sierra Pacific revised its electric and gas depreciation rates based on the results of a new depreciation study performed in 2016, the most significant impact of which was shorter estimated useful lives at the Valmy Generating Station. The effect of this change increased depreciation and amortization expense by $9 million annually based on depreciable plant balances at the time of the study. However, the PUCN ordered the change relating to the Valmy Generating Station of $7 million annually be deferred for future recovery through a regulatory asset.

Jointly Owned Utility Facilitie

Jointly Owned Utility Facilities (Notes)	12 Months Ended
	Dec. 31, 2018
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Under joint facility ownership agreements, the Domestic Regulated Businesses, as tenants in common, have undivided interests in jointly owned generation, transmission, distribution and pipeline common facilities. The Company accounts for its proportionate share of each facility and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Consolidated Statements of Operations include the Company's share of the expenses of these facilities. The amounts shown in the table below represent the Company's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Accumulated Construction Company Facility In Depreciation and Work-in- Share Service Amortization Progress PacifiCorp: Jim Bridger Nos. 1-4 67 % $ 1,458 $ 647 $ 11 Hunter No. 1 94 484 182 — Hunter No. 2 60 298 121 5 Wyodak 80 471 229 — Colstrip Nos. 3 and 4 10 248 137 6 Hermiston 50 180 87 1 Craig Nos. 1 and 2 19 367 241 — Hayden No. 1 25 74 37 — Hayden No. 2 13 43 22 — Foote Creek 79 40 27 1 Transmission and distribution facilities Various 808 246 76 Total PacifiCorp 4,471 1,976 100 MidAmerican Energy: Louisa No. 1 88 % 822 443 8 Quad Cities Nos. 1 and 2 (1) 25 723 407 10 Walter Scott, Jr. No. 3 79 641 304 2 Walter Scott, Jr. No. 4 (2) 60 454 167 1 George Neal No. 4 41 310 164 2 Ottumwa No. 1 52 630 209 6 George Neal No. 3 72 442 196 3 Transmission facilities Various 257 92 — Total MidAmerican Energy 4,279 1,982 32 NV Energy: Navajo 11 % 223 176 — Valmy 50 389 252 1 Transmission facilities Various 226 49 1 Total NV Energy 838 477 2 BHE Pipeline Group - common facilities Various 286 173 — Total $ 9,874 $ 4,608 $ 134 (1) Includes amounts related to nuclear fuel. (2) Facility in-service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million , respectively.
PacifiCorp [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Under joint facility ownership agreements with other utilities, PacifiCorp, as a tenant in common, has undivided interests in jointly owned generation, transmission and distribution facilities. PacifiCorp accounts for its proportionate share of each facility, and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Consolidated Statements of Operations include PacifiCorp's share of the expenses of these facilities. The amounts shown in the table below represent PacifiCorp's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Facility Accumulated Construction PacifiCorp in Depreciation and Work-in- Share Service Amortization Progress Jim Bridger Nos. 1 - 4 67 % $ 1,458 $ 647 $ 11 Hunter No. 1 94 484 182 — Hunter No. 2 60 298 121 5 Wyodak 80 471 229 — Colstrip Nos. 3 and 4 10 248 137 6 Hermiston 50 180 87 1 Craig Nos. 1 and 2 19 367 241 — Hayden No. 1 25 74 37 — Hayden No. 2 13 43 22 — Foote Creek 79 40 27 1 Transmission and distribution facilities Various 808 246 76 Total $ 4,471 $ 1,976 $ 100
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Under joint facility ownership agreements with other utilities, MidAmerican Energy, as a tenant in common, has undivided interests in jointly owned generation and transmission facilities. MidAmerican Energy accounts for its proportionate share of each facility, and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating expenses on the Statements of Operations include MidAmerican Energy's share of the expenses of these facilities. The amounts shown in the table below represent MidAmerican Energy's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Accumulated Construction Company Plant in Depreciation and Work-in- Share Service Amortization Progress Louisa Unit No. 1 88 % $ 822 $ 443 $ 8 Quad Cities Unit Nos. 1 & 2 (1) 25 723 407 10 Walter Scott, Jr. Unit No. 3 79 641 304 2 Walter Scott, Jr. Unit No. 4 (2) 60 454 167 1 George Neal Unit No. 4 41 310 164 2 Ottumwa Unit No. 1 52 630 209 6 George Neal Unit No. 3 72 442 196 3 Transmission facilities Various 257 92 — Total $ 4,279 $ 1,982 $ 32 (1) Includes amounts related to nuclear fuel. (2) Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Under joint facility ownership agreements, Nevada Power , as tenants in common, has undivided interests in jointly owned generation and transmission facilities. Nevada Power accounts for its proportionate share of each facility and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Consolidated Statements of Operations include Nevada Power 's share of the expenses of these facilities. The amounts shown in the table below represent Nevada Power 's share in each jointly owned facility included in property, plant and equipment, net as of December 31 , 2018 (dollars in millions): Nevada Construction Power's Utility Accumulated Work-in- Share Plant Depreciation Progress Navajo Generating Station 11 % $ 223 $ 176 $ — ON Line Transmission Line 24 147 19 1 Other transmission facilities Various 67 27 — Total $ 437 $ 222 $ 1
Sierra Pacific Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Text Block]	Jointly Owned Utility Facilities Under joint facility ownership agreements, Sierra Pacific , as tenants in common, has undivided interests in jointly owned generation and transmission facilities. Sierra Pacific accounts for its proportionate share of each facility and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Statements of Operations include Sierra Pacific 's share of the expenses of these facilities. The amounts shown in the table below represent Sierra Pacific 's share in each jointly owned facility included in property, plant and equipment, net as of December 31 , 2018 (dollars in millions): Sierra Construction Pacific's Utility Accumulated Work-in- Share Plant Depreciation Progress Valmy Generating Station 50 % $ 389 $ 252 $ 1 ON Line Transmission Line 1 8 1 — Valmy Transmission 50 4 2 — Total $ 401 $ 255 $ 1

Regulatory Matters (Notes)

Regulatory Matters (Notes)	12 Months Ended
	Dec. 31, 2018
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Regulatory Assets Regulatory assets represent costs that are expected to be recovered in future regulated rates. The Company's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 16 years $ 773 $ 675 Asset retirement obligations 17 years 375 334 Asset disposition costs Various 358 387 Deferred income taxes (2) Various 196 143 Deferred operating costs 10 years 141 147 Abandoned projects 2 years 134 156 Unrealized loss on regulated derivative contracts 2 years 120 122 Deferred net power costs 2 years 103 58 Unamortized contract values 5 years 79 89 Other Various 788 839 Total regulatory assets $ 3,067 $ 2,950 Reflected as: Current assets $ 171 $ 189 Noncurrent assets 2,896 2,761 Total regulatory assets $ 3,067 $ 2,950 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. (2) Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. The Company had regulatory assets not earning a return on investment of $1.3 billion and $1.1 billion as of December 31, 2018 and 2017 , respectively. Regulatory Liabilities Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. The Company's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) Various $ 3,923 $ 4,143 Cost of removal (2) 28 years 2,426 2,349 Levelized depreciation 30 years 329 332 Asset retirement obligations 34 years 163 177 Impact fees 4 years 88 89 Other Various 577 421 Total regulatory liabilities $ 7,506 $ 7,511 Reflected as: Current liabilities $ 160 $ 202 Noncurrent liabilities 7,346 7,309 Total regulatory liabilities $ 7,506 $ 7,511 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost. ALP General Tariff Application ("GTA") In 2014, ALP filed a GTA requesting the Alberta Utilities Commission ("AUC") to approve revenue requirements of C$811 million for 2015 and C$1.0 billion for 2016, primarily due to continued investment in capital projects as directed by the Alberta Electric System Operator. ALP amended the GTA in June 2015 to propose transmission tariff relief measures for customers and modifications to its capital structure. ALP also amended and updated the GTA in October 2015, reducing the requested revenue requirements to C$672 million for 2015 and C$704 million for 2016. In May 2016, the AUC issued its decision pertaining to the 2015-2016 GTA. ALP filed its 2015-2016 GTA compliance filing in July 2016 to comply with the AUC's decision. The compliance filing requested the AUC to approve revenue requirements of C$599 million for 2015 and C$685 million for 2016. The decreased revenue requirements requested in the compliance filing, as compared to the 2015-2016 GTA filing updated in October 2015, were primarily due to the AUC approval of ALP's proposed immediate tariff relief of C$415 million for customers for 2015 and 2016, through (i) the discontinuance of construction work-in-progress ("CWIP") in rate base and the return to allowance for funds used during construction ("AFUDC") accounting effective January 1, 2015, resulting in a C$82 million reduction of revenue requirement and the refund of C$277 million previously collected as CWIP in rate base as part of ALP's transmission tariffs during 2011-2014 less related returns of C$12 million and (ii) a change to the flow through method for calculating income taxes for 2016, resulting in further tariff relief of C$68 million . Operating revenue for the year ended December 31, 2016, included a one-time reduction of $200 million from the 2015-2016 GTA decision received in May 2016 at ALP. The 2015-2016 GTA decision required ALP to refund $200 million to customers in 2016 through reduced monthly billings for the change from receiving cash during construction for the return on CWIP in rate base to recording allowance for borrowed and equity funds used during construction related to construction expenditures during the 2011 to 2014 time period. This amount is offset with higher capitalized interest and allowance for equity funds in the Consolidated Statements of Operations. In addition, the decision required ALP to change to the flow through method of recognizing income tax expense effective January 1, 2016. This change reduced operating revenue by $45 million for the year ended December 31, 2016, with offsetting impacts to income tax expense in the Consolidated Statements of Operations.
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Regulatory Assets Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 20 years $ 448 $ 418 Utah mine disposition (2) Various 136 156 Unamortized contract values 5 years 79 89 Deferred net power costs 3 year 62 21 Unrealized loss on derivative contracts 2 years 96 101 Asset retirement obligation 31 years 119 100 Other Various 172 176 Total regulatory assets $ 1,112 $ 1,061 Reflected as: Current assets $ 36 $ 31 Noncurrent assets 1,076 1,030 Total regulatory assets $ 1,112 $ 1,061 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized. (2) Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery. PacifiCorp had regulatory assets not earning a return on investment of $636 million and $589 million as of December 31 , 2018 and 2017 , respectively. Regulatory Liabilities Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Cost of removal (1) 26 years $ 994 $ 955 Deferred income taxes (2) Various 1,803 1,960 Other Various 258 156 Total regulatory liabilities $ 3,055 $ 3,071 Reflected as: Current liabilities $ 77 $ 75 Noncurrent liabilities 2,978 2,996 Total regulatory liabilities $ 3,055 $ 3,071 (1) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost. (2) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 8 for further discussion of 2017 Tax Reform.
MidAmerican Energy Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions): Average Remaining Life 2018 2017 Asset retirement obligations (1) 12 years $ 160 $ 133 Employee benefit plans (2) 14 years 62 38 Unrealized loss on regulated derivative contracts 1 year 19 6 Other Various 32 27 Total $ 273 $ 204 (1) Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 11 for a discussion of asset retirement obligations. (2) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. MidAmerican Energy had regulatory assets not earning a return on investment of $269 million and $200 million as of December 31, 2018 and 2017 , respectively. Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions): Average Remaining Life 2018 2017 Cost of removal accrual (1) 29 years $ 708 $ 688 Deferred income taxes (2) 29 years 626 681 Asset retirement obligations (3) 34 years 160 173 Employee benefit plans (4) N/A — 41 Pre-funded AFUDC on transmission MVPs (5) 54 years 36 35 Iowa electric revenue sharing accrual (6) 1 year 70 26 Other Various 20 17 Total $ 1,620 $ 1,661 (1) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost. (2) Amounts primarily represent income tax liabilities primarily related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 9 for further discussion of 2017 Tax Reform impacts. (3) Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations. (4) Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized. (5) Represents AFUDC accrued on transmission MVPs that is deducted from rate base as a result of the inclusion of related construction work-in-progress in rate base. (6) Represents current-year accruals under a regulatory arrangement in Iowa in which equity returns exceeding specified thresholds reduce utility plant upon final determination.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Refer to Note 5 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Regulatory assets represent costs that are expected to be recovered in future rates. Nevada Power 's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Decommissioning costs (2) 5 years $ 222 $ 231 Deferred operating costs 10 years 152 169 Merger costs from 1999 merger 26 years 125 130 Employee benefit plans (1) 8 years 105 89 Asset retirement obligations 7 years 68 72 Abandoned projects 2 years 46 58 Legacy meters 14 years 53 56 ON Line deferrals 35 years 46 47 Deferred energy costs 1 year 47 46 Other Various 53 71 Total regulatory assets $ 917 $ 969 Reflected as: Current assets $ 39 $ 28 Other assets 878 941 Total regulatory assets $ 917 $ 969 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. (2) Amount includes regulatory assets with an indeterminate life of $81 million as of December 31 , 2018 . Nevada Power had regulatory assets not earning a return on investment of $334 million and $363 million as of December 31 , 2018 and 2017 , respectively. The regulatory assets not earning a return on investment primarily consist of merger costs from the 1999 merger, asset retirement obligations, deferred operating costs, a portion of the employee benefit plans, losses on reacquired debt and deferred energy costs. Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Nevada Power 's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) 27 years $ 677 $ 670 Cost of removal (2) 33 years 320 307 Impact fees (3) 4 years 86 89 Energy efficiency program 1 year 24 27 Other Various 79 28 Total regulatory liabilities $ 1,186 $ 1,121 Reflected as: Current liabilities $ 49 $ 91 Other long-term liabilities 1,137 1,030 Total regulatory liabilities $ 1,186 $ 1,121 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31 , 2018 . See Note 9 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. (3) Amounts reduce rate base or otherwise accrue a carrying cost. Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets and would be included in the table above as deferred energy costs. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs and is included in the table above as deferred energy costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Regulatory Rate Review In June 2017, Nevada Power filed an electric regulatory rate review with the PUCN. The filing supported an annual revenue increase of $29 million , or 2% , but requested no incremental annual revenue relief. In December 2017, the PUCN issued an order which reduced Nevada Power's revenue requirement by $26 million and requires Nevada Power to share 50% of regulatory earnings above 9.7% . In January 2018, Nevada Power filed a petition for clarification of certain findings and directives in the order and intervening parties filed motions for reconsideration. In December 2018, the PUCN issued an order granting petitions for clarification and reconsideration and modified the December 2017 order requiring Nevada Power to record additional expense for carrying charges on impact fees received but not yet included in rates. As a result of the order, Nevada Power recorded expense of $44 million in 2018, which consists of regulatory earnings sharing of $38 million and carrying charges of $6 million , and $28 million in December 2017, primarily due to the reduction of a regulatory asset to return to customers revenue collected for costs not incurred. The new rates were effective February 15, 2018. 2017 Tax Reform enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the United States federal corporate income tax rate from 35% to 21% . In February 2018, Nevada Power made filings with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from 2017 Tax Reform for 2018 and beyond. The filings supported an annual rate reduction of $59 million . In March 2018, the PUCN issued an order approving the rate reduction proposed by Nevada Power. The new rates were effective April 1, 2018. The order extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. In September 2018, the PUCN issued an order directing Nevada Power to record the amortization of any excess protected accumulated deferred income tax arising from the 2017 Tax Reform as a regulatory liability effective January 1, 2018. Subsequently, Nevada Power filed a petition for reconsideration relating to the amortization of protected excess accumulated deferred income tax balances resulting from the 2017 Tax Reform. In November 2018, the PUCN issued an order granting reconsideration and reaffirming the September 2018 order. In December 2018, Nevada Power filed a petition for judicial review. In March 2018, the FERC issued a Show Cause Order related to 2017 Tax Reform. In May 2018, in response to the Show Cause Order, Nevada Power proposed a reduction to transmission and certain ancillary service rates under the NV Energy OATT for the lower annual income tax expense anticipated from 2017 Tax Reform. In November 2018, FERC issued an order accepting the proposed rate reduction effective March 21, 2018 as filed and refunds to customers were made in December 2018 totaling $1 million for Nevada Power. In addition, FERC issued a notice of proposed rulemaking on public utility transmission rate changes to address accumulated deferred income taxes. Energy Efficiency Program Rates ("EEPR") and Energy Efficiency Implementation Rates ("EEIR") EEPR was established to allow Nevada Power to recover the costs of implementing energy efficiency programs and EEIR was established to offset the negative impacts on revenue associated with the successful implementation of energy efficiency programs. These rates change once a year in the utility's annual DEAA application based on energy efficiency program budgets prepared by Nevada Power and approved by the PUCN in integrated resource plan proceedings. To the extent Nevada Power 's earned rate of return exceeds the rate of return used to set base general rates, Nevada Power is required to refund to customers EEIR revenue previously collected for that year. In March 2018, Nevada Power filed an application to reset the EEIR and EEPR and to refund the EEIR revenue received in 2017, including carrying charges. In September 2018, the PUCN issued an order accepting a stipulation requiring Nevada Power to refund the 2017 revenue and reset the rates as filed effective October 1, 2018. The EEIR liability for Nevada Power is $9 million and $10 million , which is included in current regulatory liabilities on the Consolidated Balance Sheets as of December 31 , 2018 and 2017 , respectively. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution-only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In October 2016, Wynn Las Vegas, LLC ("Wynn"), became a distribution-only service customer and started procuring energy from another energy supplier. In April 2017, Wynn filed a motion with the PUCN seeking relief from the January 2016 order that established the impact fee that was paid in September 2016 and requested the PUCN adopt an alternative impact fee and revise on-going charges associated with retirement of assets and high cost renewable contracts. In September 2018, the PUCN granted relief requiring Nevada Power to credit $3 million as an offset against Wynn's remaining impact fee obligation. In October 2018, Wynn elected to pay the net present value lump sum of its Renewable Base Tariff Energy Rate ("R-BTER") obligation of $2 million , net of the $3 million credit. The PUCN ordered Nevada Power to establish a regulatory liability of $5 million amortized in equal monthly installments through December 2022 and to establish a regulatory asset of $3 million for the impact fee credit. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Nevada Power, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution-only service customer of Nevada Power. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee monthly for six years and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution-only service customer of Nevada Power. In February 2018, Caesars became a distribution-only service customer, started procuring energy from another energy supplier for its eligible meters in the Nevada Power service territory and began paying Nevada Power impact fees of $44 million in 72 equal monthly payments . In June 2018, Station Casinos LLC ("Station"), a customer of Nevada Power, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution-only service customer of Nevada Power. In October 2018, the PUCN approved an order allowing Station to purchase energy from alternative providers subject to conditions, including paying an impact fee of $15 million . In November 2018, Station filed a petition for reconsideration with the PUCN to allow Station to pay its share of the R-BTER in a single lump sum, receive a credit for a portion of impact fees previously paid by past 704B applicants and receive a credit for a portion of incremental transmission revenue associated with expected sales to others. In December 2018, the PUCN issued an order granting reconsideration and reaffirming the October 2018 order. Emissions Reduction and Capacity Retirement Plan ("ERCR Plan") In March 2017, Nevada Power retired Reid Gardner Unit 4, a 257 -MW coal-fueled generating facility. The early retirement was approved by the PUCN in December 2016 as a part of Nevada Power's second amendment to the ERCR Plan. The remaining net book value of $151 million was moved from property, plant and equipment, net to noncurrent regulatory assets on the Consolidated Balance Sheet in March 2017, in compliance with the ERCR Plan. Refer to Note 12 for additional information on the ERCR Plan.
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters Regulatory assets represent costs that are expected to be recovered in future rates. Sierra Pacific 's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 8 years $ 132 $ 110 Merger costs from 1999 merger 28 years 74 77 Abandoned projects 7 years 29 34 Renewable energy programs 1 year 4 23 Losses on reacquired debt 16 years 19 21 Other Various 63 67 Total regulatory assets $ 321 $ 332 Reflected as: Current assets $ 7 $ 32 Other assets 314 300 Total regulatory assets $ 321 $ 332 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. Sierra Pacific had regulatory assets not earning a return on investment of $190 million and $188 million as of December 31 , 2018 and 2017 , respectively. The regulatory assets not earning a return on investment primarily consist of merger costs from the 1999 merger, a portion of the employee benefit plans, losses on reacquired debt, asset retirement obligations and legacy meters. Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Sierra Pacific 's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) 28 years $ 270 $ 264 Cost of removal (2) 40 years 210 211 Deferred energy costs 1 year — 8 Other Various 29 17 Total regulatory liabilities $ 509 $ 500 Reflected as: Current liabilities $ 18 $ 19 Other long-term liabilities 491 481 Total regulatory liabilities $ 509 $ 500 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $21 million and $- million as of December 31 , 2018 and 2017 , respectively. See Note 9 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Statements of Operations but rather is deferred and recorded as a regulatory asset on the Balance Sheets and would be included in the table above as deferred energy costs. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs and is included in the table above as deferred energy costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Regulatory Rate Review Sierra Pacific made filings with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from 2017 Tax Reform for 2018 and beyond. The filings supported an annual rate reduction of $25 million . In March 2018, the PUCN issued an order approving the rate reduction proposed by Sierra Pacific. The new rates were effective April 1, 2018. The order extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. In September 2018, the PUCN issued an order directing Sierra Pacific to record the amortization of any excess protected accumulated deferred income tax arising from the 2017 Tax Reform as a regulatory liability effective January 1, 2018. Subsequently, Sierra Pacific filed a petition for reconsideration relating to the amortization of protected excess accumulated deferred income tax balances resulting from the 2017 Tax Reform. In November 2018, the PUCN issued an order granting reconsideration and reaffirming the September 2018 order. In December 2018, Sierra Pacific filed a petition for judicial review. In March 2018, the FERC issued a Show Cause Order related to 2017 Tax Reform. In May 2018, in response to the Show Cause Order, Sierra Pacific proposed a reduction to transmission and certain ancillary service rates under the NV Energy OATT for the lower annual income tax expense anticipated from 2017 Tax Reform. In November 2018, FERC issued an order accepting the proposed rate reduction effective March 21, 2018 as filed and refunds to customers were made in December 2018 totaling $1 million for Sierra Pacific. In addition, FERC issued a notice of proposed rulemaking on public utility transmission rate changes to address accumulated deferred income taxes. Energy Efficiency Program Rates ("EEPR") and Energy Efficiency Implementation Rates ("EEIR") EEPR was established to allow Sierra Pacific to recover the costs of implementing energy efficiency programs and EEIR was established to offset the negative impacts on revenue associated with the successful implementation of energy efficiency programs. These rates change once a year in the utility's annual DEAA application based on energy efficiency program budgets prepared by Sierra Pacific and approved by the PUCN in integrated resource plan proceedings. To the extent Sierra Pacific 's earned rate of return exceeds the rate of return used to set base general rates, Sierra Pacific is required to refund to customers EEIR revenue previously collected for that year. In March 2018, Sierra Pacific filed an application to reset the EEIR and EEPR and to refund the EEIR revenue received in 2017, including carrying charges. In September 2018, the PUCN issued an order accepting a stipulation to reset the rates as filed effective October 1, 2018. The EEIR liability for Sierra Pacific is $2 million and $1 million , which is included in current regulatory liabilities on the Balance Sheets as of December 31 , 2018 and 2017 , respectively. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution-only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Sierra Pacific , filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution-only service customer of Sierra Pacific . In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee monthly for three years and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution-only service customer of Sierra Pacific . In January 2018, Caesars became a distribution-only service customer and started procuring energy from another energy supplier for its eligible meters in the Sierra Pacific service territory . Following the PUCN's order from March 2017, Caesars' will pay Sierra Pacific impact fees of $4 million in 36 equal monthly payments . In May 2017, Peppermill Resort Spa Casino ("Peppermill"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution-only service customer of Sierra Pacific. In August 2017, the PUCN approved a stipulation allowing Peppermill to purchase energy from alternative providers subject to conditions, including paying an impact fee. In September 2017, Peppermill provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In April 2018, Peppermill paid a one-time impact fee of $3 million and became a distribution-only service customer and started procuring energy from another energy supplier.

Investments and Restricted Cash

Investments and Restricted Cash and Investments (Notes)	12 Months Ended
	Dec. 31, 2018
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and Restricted Cash and Investments [Text Block]	Investments and Restricted Cash and Cash Equivalents and Investments Investments and restricted cash and cash equivalents and investments consists of the following as of December 31 (in millions): 2018 2017 Investments: BYD Company Limited common stock $ 1,435 $ 1,961 Rabbi trusts 371 441 Other 168 124 Total investments 1,974 2,526 Equity method investments: BHE Renewables tax equity investments 1,661 1,025 Electric Transmission Texas, LLC 527 524 Bridger Coal Company 99 137 Other 153 148 Total equity method investments 2,440 1,834 Restricted cash and cash equivalents and investments: Quad Cities Station nuclear decommissioning trust funds 504 515 Restricted cash and cash equivalents 256 348 Total restricted cash and cash equivalents and investments 760 863 Total investments and restricted cash and cash equivalents and investments $ 5,174 $ 5,223 Reflected as: Other current assets $ 271 $ 351 Noncurrent assets 4,903 4,872 Total investments and restricted cash and cash equivalents and investments $ 5,174 $ 5,223 Investments BHE's investment in BYD Company Limited common stock is accounted for as a marketable security with changes in fair value recognized in net income. Rabbi trusts primarily hold corporate-owned life insurance on certain current and former key executives and directors. The Rabbi trusts were established to hold investments used to fund the obligations of various nonqualified executive and director compensation plans and to pay the costs of the trusts. The amount represents the cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value. The portion of unrealized losses related to marketable securities still held as of December 31, 2018 is calculated as follows (in millions): Year Ended December 31, 2018 Losses on marketable securities recognized during the period $ (538 ) Less: Net gains recognized during the period on marketable securities sold during the period 2 Unrealized losses recognized during the period on marketable securities still held at the reporting date $ (540 ) Equity Method Investments The Company has invested in projects sponsored by third parties, commonly referred to as tax equity investments. Under the terms of these tax equity investments, the Company has entered into equity capital contribution agreements with the project sponsors that require contributions. The Company has made contributions of $698 million , $403 million and $584 million in 2018 , 2017 and 2016 , respectively, pursuant to these equity capital contribution agreements as the various projects achieve commercial operation. Once a project achieves commercial operation, the Company enters into a partnership agreement with the project sponsor that directs and allocates the operating profits and tax benefits from the project. BHE , through a subsidiary, owns 50% of Electric Transmission Texas, LLC , which owns and operates electric transmission assets in the Electric Reliability Council of Texas footprint. BHE , through a subsidiary, owns 66.67% of Bridger Coal Company ("Bridger Coal"), which is a coal mining joint venture that supplies coal to the Jim Bridger Nos. 1-4 generating facility. Bridger Coal is being accounted for under the equity method of accounting as the power to direct the activities that most significantly impact Bridger Coal's economic performance are shared with the joint venture partner. See Note 11 for discussion of 2017 Tax Reform impacts to equity earnings recorded for the year ended December 31, 2017. Restricted Investments MidAmerican Energy has established a trust for the investment of funds for decommissioning the Quad Cities Nuclear Station Units 1 and 2 ("Quad Cities Station"). These investments in debt and equity securities are reported at fair value. Funds are invested in the trust in accordance with applicable federal and state investment guidelines and are restricted for use as reimbursement for costs of decommissioning the Quad Cities Station, which are currently licensed for operation until December 2032.
MidAmerican Energy Company [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and Restricted Cash and Investments [Text Block]	Investments and Restricted Investments Investments and restricted investments consists of the following amounts as of December 31 (in millions): 2018 2017 Nuclear decommissioning trust $ 504 $ 515 Rabbi trusts 191 198 Other 13 15 Total $ 708 $ 728 MidAmerican Energy has established a trust for the investment of funds for decommissioning the Quad Cities Station. The debt and equity securities in the trust are reported at fair value. Funds are invested in the trust in accordance with applicable federal and state investment guidelines and are restricted for use as reimbursement for costs of decommissioning the Quad Cities Station, which is currently licensed for operation until December 2032. As of December 31, 2018 and 2017 , the fair value of the trust's funds was invested as follows: 51% and 56% , respectively, in domestic common equity securities, 37% and 34% , respectively, in United States government securities, 9% and 7% , respectively, in domestic corporate debt securities and 3% and 3% , respectively, in other securities. Rabbi trusts primarily hold corporate-owned life insurance on certain current and former key executives and directors. The Rabbi trusts were established to hold investments used to fund the obligations of various nonqualified executive and director compensation plans and to pay the costs of the trusts. The amount represents the cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value. Changes in the cash surrender value of the policies are reflected in other income (expense) - other, net on the Statements of Operation.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and Restricted Cash and Investments [Text Block]	Investments and Restricted Investments Refer to Note 6 of MidAmerican Energy's Notes to Financial Statements in Item 8 of this Form 10-K. In addition to MidAmerican Energy's investments and restricted investments, MHC had corporate-owned life insurance policies in a Rabbi trust owned by MHC with a total cash surrender value of $2 million as of December 31, 2018 and 2017 .

Short-Term Debt and Credit Faci

Short-Term Debt and Credit Facilities (Notes)	12 Months Ended
	Dec. 31, 2018
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-Term Debt and Credit Facilities The following table summarizes BHE's and its subsidiaries' availability under their credit facilities as of December 31 (in millions): MidAmerican NV Northern BHE PacifiCorp Funding Energy Powergrid AltaLink Other Total (1) 2018: Credit facilities (2) $ 3,500 $ 1,200 $ 1,309 $ 650 $ 231 $ 639 $ 1,585 $ 9,114 Less: Short-term debt (983 ) (30 ) (240 ) — (77 ) (345 ) (841 ) (2,516 ) Tax-exempt bond support and letters of credit — (89 ) (370 ) (80 ) — (4 ) — (543 ) Net credit facilities $ 2,517 $ 1,081 $ 699 $ 570 $ 154 $ 290 $ 744 $ 6,055 2017: Credit facilities $ 3,600 $ 1,000 $ 909 $ 650 $ 203 $ 1,054 $ 1,635 $ 9,051 Less: Short-term debt (3,331 ) (80 ) — — — (345 ) (732 ) (4,488 ) Tax-exempt bond support and letters of credit (7 ) (130 ) (370 ) (80 ) — (7 ) — (594 ) Net credit facilities $ 262 $ 790 $ 539 $ 570 $ 203 $ 702 $ 903 $ 3,969 (1) The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method. (2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid. As of December 31, 2018 , the Company was in compliance with the covenants of its credit facilities and letter of credit arrangements. BHE BHE has a $3.5 billion unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. This credit facility, which is for general corporate purposes and also supports BHE's commercial paper program and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at BHE's option, plus a spread that varies based on BHE's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.76% and 1.74% , respectively. This credit facility requires that BHE's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.70 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , BHE had $115 million and $96 million , respectively, of letters of credit outstanding, of which $- million and $7 million as of December 31, 2018 and 2017 , respectively, were issued under the credit facility. These letters of credit primarily support power purchase agreements and debt service requirements at certain subsidiaries of BHE Renewables, LLC expiring through January 2020 and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date. PacifiCorp PacifiCorp has a $600 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent and a $600 million unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have variable interest rates based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.85% and 1.83% , respectively. These credit facilities require that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , PacifiCorp had $184 million and $230 million , respectively, of fully available letters of credit issued under committed arrangements. As of December 31, 2018 and 2017 , $170 million and $216 million , respectively, of these letters of credit support PacifiCorp's variable-rate tax-exempt bond obligations and expire in March 2019 and $14 million support certain transactions required by third parties and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date. MidAmerican Funding MidAmerican Energy has a $900 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. As of December 31, 2018, MidAmerican Energy had a $400 million unsecured credit facility expiring November 2019, which it terminated in January 2019. As of December 31, 2018 , the weighted average interest rate on commercial paper borrowings outstanding was 2.49% . The credit facility requires that MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. NV Energy Nevada Power has a $400 million secured credit facility expiring in June 2021 and Sierra Pacific has a $250 million secured credit facility expiring in June 2021 each w ith a one-year extension option subject to lender consent. These credit facilities, which are for general corporate purposes and provide for the issuance of letters of credit, have a variable interest rate based on the Eurodollar rate or a base rate, at each of the Nevada Utilities' option, plus a spread that varies based on each of the Nevada Utilities' credit ratings for its senior secured long‑term debt securities. Amounts due under each credit facility are collateralized by each of the Nevada Utilities' general and refunding mortgage bonds. These credit facilities require that each of the Nevada Utilities' ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. Northern Powergrid Northern Powergrid has a £150 million unsecured credit facility expiring in April 2020. The credit facility has a variable interest rate based on sterling London Interbank Offered Rate ("LIBOR") plus a spread that varies based on its credit ratings. The credit facility requires that the ratio of consolidated senior total net debt, including current maturities, to regulated asset value not exceed 0.8 to 1.0 at Northern Powergrid and 0.65 to 1.0 at Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc as of June 30 and December 31. Northern Powergrid 's interest coverage ratio shall not be less than 2.5 to 1.0. AltaLink ALP has a C$500 million secured revolving credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which provides support for borrowings under the unsecured commercial paper program and may also be used for general corporate purposes, has a variable interest rate based on the Canadian bank prime lending rate or a spread above the Bankers' Acceptance rate, at ALP 's option, based on ALP 's credit ratings for its senior secured long-term debt securities. In addition, ALP has a C$75 million secured revolving credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which may be used for general corporate purposes and letters of credit, has a variable interest rate based on the Canadian bank prime lending rate, United States base rate, a spread above the United States LIBOR loan rate or a spread above the Bankers' Acceptance rate, at ALP 's option, based on ALP 's credit ratings for its senior secured long-term debt securities. As of December 31, 2018 and 2017 , ALP had $281 million and $121 million outstanding under these facilities at a weighted average interest rate of 2.26% and 1.42% , respectively. The credit facilities require the consolidated indebtedness to total capitalization not exceed 0.75 to 1.0 measured as of the last day of each quarter. AltaLink Investments, L.P. has a C$300 million unsecured revolving term credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which may be used for general corporate purposes and letters of credit to a maximum of C$10 million , has a variable interest rate based on the Canadian bank prime lending rate, United States base rate, a spread above the United States LIBOR loan rate or a spread above the Bankers' Acceptance rate, at AltaLink Investments, L.P.'s option, based on AltaLink Investments, L.P.'s credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , AltaLink Investments, L.P. had $64 million and $224 million outstanding under this facility at a weighted average interest rate of 3.25% and 2.40% , respectively. The credit facility requires the consolidated total debt to capitalization to not exceed 0.8 to 1.0 and earnings before interest, taxes, depreciation and amortization to interest expense for the four fiscal quarters ended to not be less than 2.25 to 1.0 measured as of the last day of each quarter. HomeServices HomeServices has a $600 million unsecured credit facility expiring in September 2022. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at HomeServices' option, plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. As of December 31, 2018 and 2017 , HomeServices had $404 million and $292 million , respectively, outstanding under its credit facility with a weighted average interest rate of 3.94% and 2.75% , respectively. Through its subsidiaries, HomeServices maintains mortgage lines of credit totaling $985 million and $1.0 billion as of December 31, 2018 and 2017 , respectively, used for mortgage banking activities that expire beginning in January 2019 through December 2019 or are due on demand. The mortgage lines of credit have variable rates based on LIBOR plus a spread. Collateral for these credit facilities is comprised of residential property being financed and is equal to the loans funded with the facilities. As of December 31, 2018 and 2017 , HomeServices had $436 million and $440 million , respectively, outstanding under these mortgage lines of credit at a weighted average interest rate of 4.42% and 3.60% , respectively. BHE Renewables Letters of Credit Topaz and Solar Star have separate letter of credit and reimbursement facilities used to (a) provide security under the power purchase agreement and large generator interconnection agreements, (b) fund the debt service reserve requirement and the operation and maintenance debt service reserve requirement and (c) provide security for remediation and mitigation liabilities. As of December 31, 2018 , Topaz had $127 million of letters of credit issued under its $134 million facility and Solar Star had $92 million of letters of credit issued under its $105 million facility. As of December 31, 2017 , Topaz had $75 million of letters of credit issued under its $134 million facility and Solar Star had $282 million of letters of credit issued under its $301 million facility. As of December 31, 2018 and 2017 , certain other renewable projects collectively have letters of credit outstanding of $103 million and $118 million , respectively, primarily in support of the power purchase agreements associated with the projects.
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-term Debt and Credit Facilities The following table summarizes PacifiCorp's availability under its credit facilities as of December 31 (in millions): 2018: Credit facilities $ 1,200 Less: Short-term debt (30 ) Tax-exempt bond support (89 ) Net credit facilities $ 1,081 2017: Credit facilities $ 1,000 Less: Short-term debt (80 ) Tax-exempt bond support (130 ) Net credit facilities $ 790 PacifiCorp has a $600 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent and a $600 million unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have variable interest rates based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.85% and 1.83% , respectively. These credit facilities require that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , PacifiCorp had $184 million and $230 million , respectively, of fully available letters of credit issued under committed arrangements. As of December 31, 2018 and 2017 , $170 million and $216 million , respectively, of these letters of credit, support PacifiCorp's variable-rate tax-exempt bond obligations and expire in March 2019 and $14 million support certain transactions required by third parties and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date.
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-Term Debt and Credit Facilities Interim financing of working capital needs and the construction program is obtained from unaffiliated parties through the sale of commercial paper or short-term borrowing from banks. MidAmerican Energy has a $900 million unsecured credit facility expiring June 2021 with a one-year extension option subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. In addition, MidAmerican Energy has a $5 million unsecured credit facility, which expires in June 2019 and has a variable interest rate based on the Eurodollar rate plus a spread. As of December 31, 2018, MidAmerican Energy had a $400 million unsecured credit facility expiring November 2019, which was terminated in January 2019. As of December 31, 2018 , the weighted average interest rate on commercial paper borrowings outstanding was 2.49% . The $900 million credit facility requires that MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of any quarter. As of December 31, 2018 , MidAmerican Energy was in compliance with the covenants of its credit facilities. MidAmerican Energy has authority from the FERC to issue commercial paper and bank notes aggregating $1.3 billion through July 31, 2020. The following table summarizes MidAmerican Energy's availability under its two unsecured revolving credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 1,305 $ 905 Less: Short-term debt outstanding (240 ) — Variable-rate tax-exempt bond support (370 ) (370 ) Net credit facilities $ 695 $ 535
MidAmerican Funding, LLC and Subsidiaries [Domain]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-Term Debt and Credit Facilities Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's credit facilities, MHC has a $4 million unsecured credit facility, which expires in June 2019 and has a variable interest rate based on the Eurodollar rate plus a spread. As of December 31, 2018 and 2017 , there were no borrowings outstanding under this credit facility. As of December 31, 2018 , MHC was in compliance with the covenants of its credit facility.
Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Credit Facility Nevada Power has a $400 million secured credit facility expiring in June 2021 w ith a one-year extension option subject to lender consent. The credit facility, which is for general corporate purposes and provide for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power 's option, plus a spread that varies based on Nevada Power 's credit ratings for its senior secured long‑term debt securities. As of December 31 , 2018 and 2017 , Nevada Power had no borrowings outstanding under the credit facility. Amounts due under Nevada Power 's credit facility are collateralized by Nevada Power 's general and refunding mortgage bonds. The credit facility requires Nevada Power 's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Credit Facility The following table summarizes Sierra Pacific's availability under its credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 250 $ 250 Less - Water Facilities Refunding Revenue Bond support (80 ) (80 ) Net credit facilities $ 170 $ 170 Sierra Pacific has a $250 million secured credit facility expiring in June 2021 with a one-year extension option subject to lender consent. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific 's option, plus a spread that varies based on Sierra Pacific 's credit ratings for its senior secured long‑term debt securities. As of December 31 , 2018 and 2017 , Sierra Pacific had no borrowings outstanding under the credit facility. Amounts due under Sierra Pacific 's credit facility are collateralized by Sierra Pacific 's general and refunding mortgage bonds. The credit facility requires Sierra Pacific 's ratio of debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.

BHE Debt (Notes)

BHE Debt (Notes)	12 Months Ended
	Dec. 31, 2018
MEHC Debt [Abstract]
BHE Debt [Text Block]	BHE Debt Senior Debt BHE senior debt represents unsecured senior obligations of BHE that are redeemable in whole or in part at any time generally with make-whole premiums. BHE senior debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 5.75% Senior Notes, due 2018 — — 650 2.00% Senior Notes, due 2018 — — 350 2.40% Senior Notes, due 2020 350 349 349 2.375% Senior Notes, due 2021 450 448 — 2.80% Senior Notes, due 2023 400 398 — 3.75% Senior Notes, due 2023 500 498 498 3.50% Senior Notes, due 2025 400 398 398 3.250% Senior Notes, due 2028 600 594 — 8.48% Senior Notes, due 2028 256 257 302 6.125% Senior Bonds, due 2036 1,670 1,661 1,660 5.95% Senior Bonds, due 2037 550 547 547 6.50% Senior Bonds, due 2037 225 222 222 5.15% Senior Notes, due 2043 750 740 739 4.50% Senior Notes, due 2045 750 738 737 3.80% Senior Notes, due 2048 750 737 — 4.45% Senior Notes, due 2049 1,000 990 — Total BHE Senior Debt $ 8,651 $ 8,577 $ 6,452 Reflected as: Current liabilities $ — $ 1,000 Noncurrent liabilities 8,577 5,452 Total BHE Senior Debt $ 8,577 $ 6,452 Junior Subordinated Debentures BHE junior subordinated debentures consists of the following as of December 31 (in millions): Par Value 2018 2017 Junior subordinated debentures, due 2057 100 100 100 Total BHE junior subordinated debentures - noncurrent $ 100 $ 100 $ 100 In June 2017, BHE issued $100 million of its 5.00% junior subordinated debentures due June 2057 in exchange for 181,819 shares of BHE no par value common stock held by a minority shareholder. The junior subordinated debentures are redeemable at BHE's option at any time from and after June 15, 2037, at par plus accrued and unpaid interest. Interest expense to the minority shareholder for the year ended December 31, 2018 and 2017 was $5 million and $3 million , respectively.

Subsidiary Debt (Notes)

Subsidiary Debt (Notes)	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Subsidiary Debt	Subsidiary Debt BHE 's direct and indirect subsidiaries are organized as legal entities separate and apart from BHE and its other subsidiaries. Pursuant to separate financing agreements, substantially all of PacifiCorp's electric utility properties; the equity interest of MidAmerican Funding's subsidiary; MidAmerican Energy's electric utility properties in the state of Iowa; substantially all of Nevada Power's and Sierra Pacific's properties in the state of Nevada; AltaLink's transmission properties; and substantially all of the assets of the subsidiaries of BHE Renewables that are direct or indirect owners of solar and wind generation projects are pledged or encumbered to support or otherwise provide the security for their related subsidiary debt. It should not be assumed that the assets of any subsidiary will be available to satisfy BHE 's obligations or the obligations of its other subsidiaries. However, unrestricted cash or other assets which are available for distribution may, subject to applicable law, regulatory commitments and the terms of financing and ring-fencing arrangements for such parties, be advanced, loaned, paid as dividends or otherwise distributed or contributed to BHE or affiliates thereof. The long-term debt of BHE's subsidiaries may include provisions that allow BHE 's subsidiaries to redeem such debt in whole or in part at any time. These provisions generally include make-whole premiums. Distributions at these separate legal entities are limited by various covenants including, among others, leverage ratios, interest coverage ratios and debt service coverage ratios. As of December 31, 2018 , all subsidiaries were in compliance with their long-term debt covenants. On January 29, 2019, PG&E Corporation and Pacific Gas and Electric Company (the "PG&E Utility") (together "PG&E") filed voluntary petitions for relief under chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Northern District of California. As a result, the Company does not expect to receive distributions from Topaz Solar Farms LLC ("Topaz") or Agua Caliente Solar, LLC ("Agua Caliente") in the near term. Long-term debt of subsidiaries consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 PacifiCorp $ 7,076 $ 7,036 $ 7,025 MidAmerican Funding 5,668 5,599 5,259 NV Energy 4,321 4,318 4,581 Northern Powergrid 2,621 2,626 2,805 BHE Pipeline Group 1,050 1,042 796 BHE Transmission 3,856 3,842 4,334 BHE Renewables 3,438 3,401 3,594 HomeServices 233 233 247 Total subsidiary debt $ 28,263 $ 28,097 $ 28,641 Reflected as: Current liabilities $ 2,106 $ 2,431 Noncurrent liabilities 25,991 26,210 Total subsidiary debt $ 28,097 $ 28,641 PacifiCorp PacifiCorp's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs as of December 31 (dollars in millions): Par Value 2018 2017 First mortgage bonds: 2.95% to 8.53%, due through 2023 $ 1,824 $ 1,821 $ 2,320 3.35% to 6.71%, due 2024 to 2026 775 771 771 7.70% due 2031 300 298 298 5.25% to 6.35%, due 2034 to 2038 2,350 2,338 2,337 4.10% to 6.00%, due 2039 to 2042 950 939 938 4.125%, due 2049 600 593 — Variable-rate series, tax-exempt bond obligations (2018-1.67% to 1.85%; 2017-1.60% to 1.87%): Due 2018 to 2020 38 38 79 Due 2018 to 2025 (1) 25 25 70 Due 2024 (1)(2) 143 142 142 Due 2024 to 2025 (2) 50 50 50 Capital lease obligations - 8.75% to 14.61%, due through 2035 21 21 20 Total PacifiCorp $ 7,076 $ 7,036 $ 7,025 (1) Supported by $170 million and $216 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018 and 2017 , respectively. (2) Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations. The issuance of PacifiCorp's first mortgage bonds is limited by available property, earnings tests and other provisions of PacifiCorp's mortgage. Approximately $28 billion of PacifiCorp's eligible property (based on original cost) was subject to the lien of the mortgage as of December 31, 2018 . MidAmerican Funding MidAmerican Funding's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 MidAmerican Funding: 6.927% Senior Bonds, due 2029 $ 240 $ 217 $ 216 MidAmerican Energy: Tax-exempt bond obligations - Variable-rate tax-exempt bond obligation series: (2018-1.74%, 2017-1.91%), due 2023-2047 370 368 368 First Mortgage Bonds: 2.40%, due 2019 500 500 499 3.70%, due 2023 250 249 248 3.50%, due 2024 500 501 501 3.10%, due 2027 375 372 372 4.80%, due 2043 350 346 346 4.40%, due 2044 400 394 394 4.25%, due 2046 450 445 445 3.95%, due 2047 475 470 470 3.65%, due 2048 700 688 — Notes: 5.30% Series, due 2018 — — 350 6.75% Series, due 2031 400 396 396 5.75% Series, due 2035 300 298 298 5.80% Series, due 2036 350 348 348 Transmission upgrade obligation, 4.45% and 3.42% due through 2035 and 2036, respectively 7 5 6 Capital lease obligations - 4.16%, due through 2020 1 2 2 Total MidAmerican Energy 5,428 5,382 5,043 Total MidAmerican Funding $ 5,668 $ 5,599 $ 5,259 In January 2019, MidAmerican Energy issued $600 million of its 3.65% First Mortgage Bonds due April 2029 and $900 million of its 4.25% First Mortgage Bonds due July 2049. In February 2019, MidAmerican Energy redeemed $500 million of its 2.40% First Mortgage Bonds due in March 2019 at a redemption price of 100% of the principal amount plus accrued interest. Pursuant to MidAmerican Energy's mortgage dated September 9, 2013, as amended by the First Supplemental Indenture dated as of September 19, 2013, MidAmerican Energy's first mortgage bonds, currently and from time to time outstanding, are secured by a first mortgage lien on substantially all of its electric generating, transmission and distribution property within the state of Iowa, subject to certain exceptions and permitted encumbrances. As of December 31, 2018 , MidAmerican Energy's eligible property subject to the lien of the mortgage totaled approximately $18 billion based on original cost. Additionally, MidAmerican Energy's senior notes outstanding are equally and ratably secured with the first mortgage bonds as required by the indentures under which the senior notes were issued. MidAmerican Energy's variable-rate tax-exempt obligations bear interest at rates that are periodically established through remarketing of the bonds in the short-term tax-exempt market. MidAmerican Energy, at its option, may change the mode of interest calculation for these bonds by selecting from among several floating or fixed rate alternatives. The interest rates shown in the table above are the weighted average interest rates as of December 31, 2018 and 2017 . MidAmerican Energy maintains revolving credit facility agreements to provide liquidity for holders of these issues and $180 million of the variable rate, tax-exempt bonds are secured by an equal amount of first mortgage bonds pursuant to MidAmerican Energy's mortgage dated September 9, 2013, as supplemented and amended. NV Energy NV Energy's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 NV Energy - 6.250% Senior Notes, due 2020 $ 315 $ 330 $ 337 Nevada Power: General and refunding mortgage securities: 6.500% Series O, due 2018 — — 324 6.500% Series S, due 2018 — — 499 7.125% Series V, due 2019 500 500 499 2.750%, Series BB, due 2020 575 574 — 6.650% Series N, due 2036 367 360 359 6.750% Series R, due 2037 349 348 348 5.375% Series X, due 2040 250 248 248 5.450% Series Y, due 2041 250 244 244 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.800% Pollution Control Bonds Series 2017A, due 2032 (1) 40 40 40 1.600% Pollution Control Bonds Series 2017, due 2036 (1) 40 39 39 1.600% Pollution Control Bonds Series 2017B, due 2039 (1) 13 13 13 Capital and financial lease obligations - 2.750% to 11.600%, due through 2054 463 463 475 Total Nevada Power 2,847 2,829 3,088 Sierra Pacific: General and refunding mortgage securities: 3.375% Series T, due 2023 250 249 249 2.600% Series U, due 2026 400 396 396 6.750% Series P, due 2037 252 256 256 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.250% Pollution Control Series 2016A, due 2029 (2) 20 20 20 1.500% Gas Facilities Series 2016A, due 2031 (2) 59 58 58 3.000% Gas and Water Series 2016B, due 2036 (3) 60 62 63 Variable-rate series (2018 - 1.750% to 1.820%, 2017 - 1.690% to 1.840%): Water Facilities Series 2016C, due 2036 30 30 30 Water Facilities Series 2016D, due 2036 25 25 25 Water Facilities Series 2016E, due 2036 25 25 25 Capital and financial lease obligations - 2.700% to 10.297%, due through 2054 38 38 34 Total Sierra Pacific 1,159 1,159 1,156 Total NV Energy $ 4,321 $ 4,318 $ 4,581 (1) Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time. (2) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time. (3) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time. In January 2019, Nevada Power issued $500 million of its 3.70% General and Refunding Mortgage Notes, Series CC, due May 2029. The issuance of General and Refunding Mortgage Securities by the Nevada Utilities are subject to PUCN approval and are limited by available property and other provisions of the mortgage indentures for each of Nevada Power and Sierra Pacific. As of December 31, 2018 , approximately $8.5 billion of Nevada Power's and $4.1 billion of Sierra Pacific's (based on original cost) property was subject to the liens of the mortgages. Northern Powergrid Northern Powergrid and its subsidiaries' long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value (1) 2018 2017 8.875% Bonds, due 2020 $ 128 $ 133 $ 144 9.25% Bonds, due 2020 255 260 279 3.901% to 4.586% European Investment Bank loans, due 2018 to 2022 294 293 366 7.25% Bonds, due 2022 255 262 279 2.50% Bonds due 2025 191 189 200 2.073% European Investment Bank loan, due 2025 64 65 69 2.564% European Investment Bank loans, due 2027 319 318 336 7.25% Bonds, due 2028 237 241 256 4.375% Bonds, due 2032 191 188 199 5.125% Bonds, due 2035 255 252 267 5.125% Bonds, due 2035 191 189 200 Variable-rate bond, due 2026 (2) 241 236 210 Total Northern Powergrid $ 2,621 $ 2,626 $ 2,805 (1) The par values for these debt instruments are denominated in sterling. (2) Amortizes semiannually and the Company has entered into an interest rate swap that fixes the interest rate on 85% of the outstanding debt. The variable interest rate as of December 31, 2018 was 2.66% while the fixed interest rate was 2.82% . BHE Pipeline Group BHE Pipeline Group 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Northern Natural Gas: 5.75% Senior Notes, due 2018 $ — $ — $ 200 4.25% Senior Notes, due 2021 200 199 199 5.80% Senior Bonds, due 2037 150 149 149 4.10% Senior Bonds, due 2042 250 248 248 4.30% Senior Bonds, due 2049 450 446 — Total BHE Pipeline Group $ 1,050 $ 1,042 $ 796 BHE Transmission BHE Transmission 's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value (1) 2018 2017 AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019 $ 147 $ 148 $ 162 Series 13-1 Senior Bonds, 3.265%, due 2020 147 148 161 Series 15-1 Senior Bonds, 2.244%, due 2022 147 146 158 Total AltaLink Investments, L.P. 441 442 481 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018 — — 159 Series 2013-2 Notes, 3.621%, due 2020 92 92 99 Series 2012-2 Notes, 2.978%, due 2022 202 201 218 Series 2013-4 Notes, 3.668%, due 2023 366 366 397 Series 2014-1 Notes, 3.399%, due 2024 256 256 278 Series 2016-1 Notes, 2.747%, due 2026 256 255 277 Series 2006-1 Notes, 5.249%, due 2036 110 109 119 Series 2010-1 Notes, 5.381%, due 2040 92 91 99 Series 2010-2 Notes, 4.872%, due 2040 110 109 119 Series 2011-1 Notes, 4.462%, due 2041 202 201 218 Series 2012-1 Notes, 3.990%, due 2042 385 380 412 Series 2013-3 Notes, 4.922%, due 2043 256 256 278 Series 2014-3 Notes, 4.054%, due 2044 216 215 233 Series 2015-1 Notes, 4.090%, due 2045 256 255 277 Series 2016-2 Notes, 3.717%, due 2046 330 328 356 Series 2013-1 Notes, 4.446%, due 2053 183 183 198 Series 2014-2 Notes, 4.274%, due 2064 95 95 103 Total AltaLink, L.P. 3,407 3,392 3,840 Other: Construction Loan, 5.660%, due 2020 8 8 13 Total BHE Transmission $ 3,856 $ 3,842 $ 4,334 (1) The par values for these debt instruments are denominated in Canadian dollars. BHE Renewables BHE Renewables ' long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Fixed-rate (1) : Bishop Hill Holdings Senior Notes, 5.125%, due 2032 85 84 93 Solar Star Funding Senior Notes, 3.950%, due 2035 295 292 310 Solar Star Funding Senior Notes, 5.375%, due 2035 924 915 965 Grande Prairie Wind Senior Notes, 3.860%, due 2037 396 392 404 Topaz Solar Farms Senior Notes, 5.750%, due 2039 718 709 745 Topaz Solar Farms Senior Notes, 4.875%, due 2039 207 205 217 Alamo 6 Senior Notes, 4.170%, due 2042 224 221 229 Other 16 16 19 Variable-rate (1) : Pinyon Pines I and II Term Loans, due 2019 (2) 310 310 333 TX Jumbo Road Term Loan, due 2025 (2) 180 176 193 Marshall Wind Term Loan, due 2026 (2) 83 81 86 Total BHE Renewables $ 3,438 $ 3,401 $ 3,594 (1) Amortizes quarterly or semiannually. (2) The term loans have variable interest rates based on LIBOR plus a margin that varies during the terms of the agreements. The Company has entered into interest rate swaps that fix the interest rate on 75% of the Pinyon Pines outstanding debt and 100% of the TX Jumbo Road and Marshall Wind outstanding debt. The variable interest rate as of December 31, 2018 and 2017 was 4.55% and 3.32% , respectively, while the fixed interest rates as of December 31, 2018 and 2017 ranged from 3.21% to 3.63% . HomeServices HomeServices ' long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Variable-rate (1) : Variable-rate term loan (2018 - 4.022%, 2017 - 2.819%), due 2022 $ 233 $ 233 $ 247 (1) Amortizes quarterly. Annual Repayments of Long-Term Debt The annual repayments of BHE and subsidiary debt for the years beginning January 1, 2019 and thereafter, excluding fair value adjustments and unamortized premiums, discounts and debt issuance costs, are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total BHE senior notes $ — $ 350 $ 450 $ — $ 900 $ 6,951 $ 8,651 BHE junior subordinated debentures — — — — — 100 100 PacifiCorp 352 40 425 606 450 5,203 7,076 MidAmerican Funding 500 2 — 1 315 4,850 5,668 NV Energy 523 913 28 29 271 2,557 4,321 Northern Powergrid 80 462 31 479 33 1,536 2,621 BHE Pipeline Group — — 200 — — 850 1,050 BHE Transmission 148 245 — 348 367 2,748 3,856 BHE Renewables 483 168 175 172 177 2,263 3,438 HomeServices 20 27 33 153 — — 233 Totals $ 2,106 $ 2,207 $ 1,342 $ 1,788 $ 2,513 $ 27,058 $ 37,014
PacifiCorp [Member]
Debt Instrument [Line Items]
Debt and Capital Leases Disclosures [Text Block]	Long-term Debt and Capital Lease Obligations PacifiCorp's long-term debt and capital lease obligations were as follows as of December 31 (dollars in millions): 2018 2017 Average Average Principal Carrying Interest Carrying Interest Amount Value Rate Value Rate First mortgage bonds: 2.95% to 8.53%, due through 2023 $ 1,824 $ 1,821 4.48 % $ 2,320 4.73 % 3.35% to 6.71%, due 2024 to 2026 775 771 3.92 771 3.92 7.70% due 2031 300 298 7.70 298 7.70 5.25% to 6.35%, due 2034 to 2038 2,350 2,338 5.96 2,337 5.96 4.10% to 6.00%, due 2039 to 2042 950 939 5.40 938 5.40 4.125%, due 2049 600 593 4.13 — — Variable-rate series, tax-exempt bond obligations (2018-1.67% to 1.85%; 2017-1.60% to 1.87%): Due 2018 to 2020 38 38 1.85 79 1.77 Due 2018 to 2025 (1) 25 25 1.75 70 1.81 Due 2024 (1)(2) 143 142 1.68 142 1.73 Due 2024 to 2025 (2) 50 50 1.75 50 1.72 Total long-term debt 7,055 7,015 7,005 Capital lease obligations: 8.75% to 14.61%, due through 2035 21 21 10.55 20 11.46 Total long-term debt and capital lease obligations $ 7,076 $ 7,036 $ 7,025 Reflected as: 2018 2017 Current portion of long-term debt and capital lease obligations $ 352 $ 588 Long-term debt and capital lease obligations 6,684 6,437 Total long-term debt and capital lease obligations $ 7,036 $ 7,025 1) Supported by $170 million and $216 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018 and 2017 , respectively. 2) Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations. PacifiCorp's long-term debt generally includes provisions that allow PacifiCorp to redeem the first mortgage bonds in whole or in part at any time through the payment of a make-whole premium. Variable-rate tax-exempt bond obligations are generally redeemable at par value. PacifiCorp currently has regulatory authority from the Oregon Public Utility Commission and the Idaho Public Utilities Commission to issue an additional $2.0 billion of long-term debt. PacifiCorp must make a notice filing with the Washington Utilities and Transportation Commission prior to any future issuance. PacifiCorp currently has an effective shelf registration statement filed with the United States Securities and Exchange Commission (SEC) to issue up to $2.0 billion additional first mortgage bonds through October 2021. The issuance of PacifiCorp's first mortgage bonds is limited by available property, earnings tests and other provisions of PacifiCorp's mortgage. Approximately $28 billion of PacifiCorp's eligible property (based on original cost) was subject to the lien of the mortgage as of December 31, 2018 . PacifiCorp has entered into long-term agreements that qualify as capital leases and expire at various dates through March 2035 for transportation services, a power purchase agreement and real estate. The transportation services agreements included as capital leases are for the right to use pipeline facilities to provide natural gas to two of PacifiCorp's generating facilities. Net capital lease assets of $21 million and $20 million as of December 31, 2018 and 2017 , respectively, were included in property, plant and equipment, net in the Consolidated Balance Sheets. As of December 31, 2018 , the annual principal maturities of long-term debt and total capital lease obligations for 2019 and thereafter are as follows (in millions): Long-term Capital Lease Debt Obligations Total 2019 $ 350 $ 4 $ 354 2020 38 3 41 2021 420 7 427 2022 605 3 608 2023 449 2 451 Thereafter 5,193 16 5,209 Total 7,055 35 7,090 Unamortized discount and debt issuance costs (40 ) — (40 ) Amounts representing interest — (14 ) (14 ) Total $ 7,015 $ 21 $ 7,036
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Long-term Debt [Text Block]	Long-Term Debt MidAmerican Energy's long-term debt consists of the following, including amounts maturing within one year and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 First mortgage bonds: 2.40%, due 2019 $ 500 $ 500 $ 499 3.70%, due 2023 250 249 248 3.50%, due 2024 500 500 501 3.10%, due 2027 375 372 372 4.80%, due 2043 350 346 346 4.40%, due 2044 400 395 394 4.25%, due 2046 450 445 445 3.95%, due 2047 475 470 470 3.65%, due 2048 700 688 — Notes: 5.3% Series, due 2018 — — 350 6.75% Series, due 2031 400 396 396 5.75% Series, due 2035 300 298 298 5.8% Series, due 2036 350 347 347 Transmission upgrade obligation, 4.45% and 3.42% due through 2035 and 2036, respectively 6 5 6 Variable-rate tax-exempt bond obligation series: (weighted average interest rate- 2018-1.74%, 2017-1.91%): Due 2023, issued in 1993 7 7 7 Due 2023, issued in 2008 57 57 57 Due 2024 35 35 35 Due 2025 13 13 13 Due 2036 33 33 33 Due 2038 45 45 45 Due 2046 30 29 29 Due 2047 150 149 149 Capital lease obligations - 4.16%, due through 2020 2 2 2 Total $ 5,428 $ 5,381 $ 5,042 The annual repayments of MidAmerican Energy's long-term debt for the years beginning January 1, 2019 , and thereafter, excluding unamortized premiums, discounts and debt issuance costs, are as follows (in millions): 2019 $ 500 2020 2 2021 — 2022 — 2023 315 2024 and thereafter 4,611 In January 2019, MidAmerican Energy issued $600 million of its 3.65% First Mortgage Bonds due April 2029 and $900 million of its 4.25% First Mortgage Bonds due July 2049. In February 2019, MidAmerican Energy redeemed $500 million of its 2.40% First Mortgage Bonds due in March 2019 at a redemption price of 100% of the principal amount plus accrued interest. Pursuant to MidAmerican Energy's mortgage dated September 9, 2013, MidAmerican Energy's first mortgage bonds, currently and from time to time outstanding, are secured by a first mortgage lien on substantially all of its electric generating, transmission and distribution property within the State of Iowa, subject to certain exceptions and permitted encumbrances. As of December 31, 2018 , MidAmerican Energy's eligible property subject to the lien of the mortgage totaled approximately $18 billion based on original cost. Additionally, MidAmerican Energy's senior notes outstanding are equally and ratably secured with the first mortgage bonds as required by the indentures under which the senior notes were issued. MidAmerican Energy's variable-rate tax-exempt bond obligations bear interest at rates that are periodically established through remarketing of the bonds in the short-term tax-exempt market. MidAmerican Energy, at its option, may change the mode of interest calculation for these bonds by selecting from among several floating or fixed rate alternatives. The interest rates shown in the table above are the weighted average interest rates as of December 31, 2018 and 2017 . MidAmerican Energy maintains revolving credit facility agreements to provide liquidity for holders of these issues. Additionally, MidAmerican Energy's obligations associated with the $30 million and $150 million variable rate, tax-exempt bond obligations due 2046 and 2047, respectively, are secured by an equal amount of first mortgage bonds pursuant to MidAmerican Energy's mortgage dated September 9, 2013, as supplemented and amended. Proceeds of the $150 million of variable-rate, tax-exempt Solid Waste Facilities Revenue Bonds due December 2047 are restricted for the purpose of constructing solid waste facilities. As of December 31, 2018 , $56 million of the restricted proceeds remain and are reflected in other current assets on the Balance Sheet. As of December 31, 2018 , MidAmerican Energy was in compliance with all of its applicable long-term debt covenants. In March 1999, MidAmerican Energy committed to the IUB to use commercially reasonable efforts to maintain an investment grade rating on its long-term debt and to maintain its common equity level above 42% of total capitalization unless circumstances beyond its control result in the common equity level decreasing to below 39% of total capitalization. MidAmerican Energy must seek the approval from the IUB of a reasonable utility capital structure if MidAmerican Energy's common equity level decreases below 42% of total capitalization, unless the decrease is beyond the control of MidAmerican Energy. MidAmerican Energy is also required to seek the approval of the IUB if MidAmerican Energy's equity level decreases to below 39% , even if the decrease is due to circumstances beyond the control of MidAmerican Energy. As of December 31, 2018 , MidAmerican Energy's common equity ratio was 53% computed on a basis consistent with its commitment. As a result of its regulatory commitment to maintain its common equity level above certain thresholds, MidAmerican Energy could dividend $2.5 billion as of December 31, 2018 , without falling below 42% .
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Long-term Debt [Text Block]	Long-Term Debt Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements for detail and a discussion of its long-term debt. In addition to MidAmerican Energy's annual repayments of long-term debt, MidAmerican Funding has $239 million of 6.927% Senior Bonds due in 2029 , with a carrying value of $240 million as of December 31, 2018 and 2017 . In December 2017, MidAmerican Funding redeemed through a tender offer a portion of its 6.927% Senior Bonds. A charge of $29 million for the total premium is included in other income (expense) on the Consolidated Statement of Operations. MidAmerican Funding parent company long-term debt is secured by a pledge of the common stock of MHC. See Item 15(c) for the Consolidated Financial Statements of MHC Inc. and subsidiaries. The bonds are the direct senior secured obligations of MidAmerican Funding and effectively rank junior to all indebtedness and other liabilities of the direct and indirect subsidiaries of MidAmerican Funding, to the extent of the assets of these subsidiaries. MidAmerican Funding may redeem the bonds in whole or in part at any time at a redemption price equal to the sum of any accrued and unpaid interest to the date of redemption and the greater of (1) 100% of the principal amount of the bonds or (2) the sum of the present values of the remaining scheduled payments of principal and interest on the bonds, discounted to the date of redemption on a semiannual basis at the treasury yield plus 25 basis points. Subsidiaries of MidAmerican Funding must make payments on their own indebtedness before making distributions to MidAmerican Funding. Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements for a discussion of utility regulatory restrictions affecting distributions from MidAmerican Energy. As a result of the utility regulatory restrictions agreed to by MidAmerican Energy in March 1999, MidAmerican Funding had restricted net assets of $3.9 billion as of December 31, 2018 . As of December 31, 2018 , MidAmerican Funding was in compliance with all of its applicable long-term debt covenants. Each of MidAmerican Funding's direct or indirect subsidiaries is organized as a legal entity separate and apart from MidAmerican Funding and its other subsidiaries. It should not be assumed that any asset of any subsidiary of MidAmerican Funding will be available to satisfy the obligations of MidAmerican Funding or any of its other subsidiaries; provided, however, that unrestricted cash or other assets which are available for distribution may, subject to applicable law and the terms of financing arrangements of such parties, be advanced, loaned, paid as dividends or otherwise distributed or contributed to MidAmerican Funding, one of its subsidiaries or affiliates thereof.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Disclosure [Text Block]	Long-Term Debt and Financial and Capital Lease Obligations Nevada Power 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 General and refunding mortgage securities: 6.500% Series O, due 2018 $ — $ — $ 324 6.500% Series S, due 2018 — — 499 7.125% Series V, due 2019 500 500 499 6.650% Series N, due 2036 367 358 357 6.750% Series R, due 2037 349 346 346 5.375% Series X, due 2040 250 247 247 5.450% Series Y, due 2041 250 236 236 2.750%, Series BB, due 2020 575 574 — Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.800% Pollution Control Bonds Series 2017A, due 2032 (1) 40 40 40 1.600% Pollution Control Bonds Series 2017, due 2036 (1) 40 39 39 1.600% Pollution Control Bonds Series 2017B, due 2039 (1) 13 13 13 Capital and financial lease obligations - 2.750% to 11.600%, due through 2054 463 463 475 Total long-term debt and financial and capital leases $ 2,847 $ 2,816 $ 3,075 Reflected as: Current portion of long-term debt and financial and capital lease obligations $ 520 $ 842 Long-term debt and financial and capital lease obligations 2,296 2,233 Total long-term debt and financial and capital leases $ 2,816 $ 3,075 (1) Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time. Annual Payment on Long-Term Debt and Financial and Capital Leases The annual repayments of long-term debt and capital and financial leases for the years beginning January 1, 2019 and thereafter, are as follows (in millions): Long-term Capital and Financial Debt Lease Obligations Total 2019 $ 500 $ 78 $ 578 2020 575 77 652 2021 — 80 80 2022 — 76 76 2023 — 52 52 Thereafter 1,309 709 2,018 Total 2,384 1,072 3,456 Unamortized premium, discount and debt issuance cost (31 ) — (31 ) Executory costs — (74 ) (74 ) Amounts representing interest — (535 ) (535 ) Total $ 2,353 $ 463 $ 2,816 In January 2019, Nevada Power issued $500 million of its 3.70% General and Refunding Mortgage Notes, Series CC, due May 2029. The issuance of General and Refunding Mortgage Securities by Nevada Power is subject to PUCN approval and is limited by available property and other provisions of the mortgage indentures. As of December 31, 2018 , approximately $8.5 billion (based on original cost) of Nevada Power 's property was subject to the liens of the mortgages. Financial and Capital Lease Obligations • In 1984, Nevada Power entered into a 30 -year capital lease for the Pearson Building with five , five -year renewal options beginning in year 2015. In February 2010, Nevada Power amended this capital lease agreement to include the lease of the adjoining parking lot and to exercise three of the five -year renewal options beginning in year 2015. There remain two additional renewal options which could extend the lease an additional ten years. Capital assets of $23 million and $24 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 , respectively. • In 2007, Nevada Power entered into a 20 -year lease, with three 10 -year renewal options, to occupy land and building for its Beltway Complex operations center in southern Nevada. Nevada Power accounts for the building portion of the lease as a capital lease and the land portion of the lease as an operating lease. Nevada Power transferred operations to the facilities in June 2009. Capital assets of $6 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 . • Nevada Power has long-term energy purchase contracts which qualify as capital leases. The leases were entered into between the years 1989 and 1990 and became commercially operable through 1993. The terms of the leases are for 30 years and expire between the years 2022-2023. Capital assets of $30 million and $34 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 , respectively. • Nevada Power has master leasing agreements of which various pieces of equipment qualify as capital leases. The remaining equipment is treated as operating leases. Lease terms under the master lease agreement are typically five to seven years. Capital assets of $6 million and $3 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 , respectively. • ON Line was placed in-service on December 31 , 2013. The Nevada Utilities entered into a long-term transmission use agreement, in which the Nevada Utilities have 25% interest and Great Basin Transmission South, LLC has 75% interest. Refer to Note 4 for additional information. The Nevada Utilities ' share of the long-term transmission use agreement and ownership interest is split at 95% for Nevada Power and 5% for Sierra Pacific. The term is for 41 years with the agreement ending December 31 , 2054. Payments began on January 31, 2014. ON Line assets of $387 million and $396 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 , respectively.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Disclosure [Text Block]	Long-Term Debt and Financial and Capital Lease Obligations Sierra Pacific 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 General and refunding mortgage securities: 3.375% Series T, due 2023 $ 250 $ 249 $ 248 2.600% Series U, due 2026 400 396 396 6.750% Series P, due 2037 252 255 255 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.250% Pollution Control Series 2016A, due 2029 (1) 20 20 20 1.500% Gas Facilities Series 2016A, due 2031 (1) 59 58 58 3.000% Gas and Water Series 2016B, due 2036 (2) 60 62 63 Variable-rate series (2018 - 1.750% to 1.820%, 2017 - 1.690% to 1.840%): Water Facilities Series 2016C, due 2036 30 30 30 Water Facilities Series 2016D, due 2036 25 25 25 Water Facilities Series 2016E, due 2036 25 25 25 Capital and financial lease obligations - 2.700% to 10.297%, due through 2054 38 38 34 Total long-term debt and financial and capital leases $ 1,159 $ 1,158 $ 1,154 Reflected as: Current portion of long-term debt and financial and capital lease obligations $ 3 $ 2 Long-term debt and financial and capital lease obligations 1,155 1,152 Total long-term debt and financial and capital leases $ 1,158 $ 1,154 (1) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time. (2) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time. Annual Payment on Long-Term Debt and Financial and Capital Leases The annual repayments of long-term debt and capital and financial leases for the years beginning January 1, 2019 and thereafter, are as follows (in millions): Long-term Capital and Financial Debt Lease Obligations Total 2019 $ — $ 6 $ 6 2020 — 4 4 2021 — 5 5 2022 — 4 4 2023 250 4 254 Thereafter 871 47 918 Total 1,121 70 1,191 Unamortized premium, discount and debt issuance cost (1 ) — (1 ) Amounts representing interest — (32 ) (32 ) Total $ 1,120 $ 38 $ 1,158 The issuance of General and Refunding Mortgage Securities by Sierra Pacific is subject to PUCN approval and is limited by available property and other provisions of the mortgage indentures. As of December 31, 2018 , approximately $4.1 billion (based on original cost) of Sierra Pacific 's property was subject to the liens of the mortgages. Financial and Capital Lease Obligations • Sierra Pacific has master leasing agreements of which various pieces of equipment qualify as capital leases. The remaining equipment is treated as operating leases. Lease terms under the master lease agreement are typically five to seven years. Capital assets of $8 million and $3 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 . • ON Line was placed in-service on December 31, 2013. The Nevada Utilities entered into a long-term transmission use agreement, in which the Nevada Utilities have 25% interest and Great Basin Transmission South, LLC has 75% interest. Refer to Note 4 for additional information. The Nevada Utilities share of the long-term transmission use agreement and ownership interest is split at 5% for Sierra Pacific and 95% for Nevada Power. The term is for 41 years with the agreement ending December 31, 2054. Payments began on January 31, 2014. ON Line assets of $20 million and $21 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 . • In 2015, Sierra Pacific entered into a 20 -year capital lease for the Fort Churchill Solar Array. Capital assets of $9 million were included in property, plant and equipment, net as of December 31 , 2018 and 2017 .

Risk Management and Hedging Act

Risk Management and Hedging Activities (Notes)	12 Months Ended
	Dec. 31, 2018
PacifiCorp [Member]
Derivative [Line Items]
Risk Management and Hedging Activities [Text Block]	Risk Management and Hedging Activities PacifiCorp is exposed to the impact of market fluctuations in commodity prices and interest rates. PacifiCorp is principally exposed to electricity, natural gas, coal and fuel oil commodity price risk as it has an obligation to serve retail customer load in its service territories. PacifiCorp's load and generating facilities represent substantial underlying commodity positions. Exposures to commodity prices consist mainly of variations in the price of fuel required to generate electricity and wholesale electricity that is purchased and sold. Commodity prices are subject to wide price swings as supply and demand are impacted by, among many other unpredictable items, weather, market liquidity, generating facility availability, customer usage, storage, and transmission and transportation constraints. Interest rate risk exists on variable-rate debt and future debt issuances. PacifiCorp does not engage in a material amount of proprietary trading activities. PacifiCorp has established a risk management process that is designed to identify, assess, manage, mitigate, monitor and report, each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, PacifiCorp uses commodity derivative contracts, which may include forwards, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. PacifiCorp manages its interest rate risk by limiting its exposure to variable interest rates primarily through the issuance of fixed-rate long-term debt and by monitoring market changes in interest rates. Additionally, PacifiCorp may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate PacifiCorp's exposure to interest rate risk. No interest rate derivatives were in place during the periods presented. PacifiCorp does not hedge all of its commodity price and interest rate risks, thereby exposing the unhedged portion to changes in market prices. There have been no significant changes in PacifiCorp's accounting policies related to derivatives. Refer to Notes 2 and 12 for additional information on derivative contracts. The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2018: Not designated as hedging contracts (1) : Commodity assets $ 36 $ 4 $ 10 $ 1 $ 51 Commodity liabilities (9 ) (1 ) (67 ) (71 ) (148 ) Total 27 3 (57 ) (70 ) (97 ) Total derivatives 27 3 (57 ) (70 ) (97 ) Cash collateral (payable) receivable (2 ) — 16 45 59 Total derivatives - net basis $ 25 $ 3 $ (41 ) $ (25 ) $ (38 ) As of December 31, 2017: Not designated as hedging contracts (1) : Commodity assets $ 11 $ 1 $ 1 $ — $ 13 Commodity liabilities (3 ) — (32 ) (82 ) (117 ) Total 8 1 (31 ) (82 ) (104 ) Total derivatives 8 1 (31 ) (82 ) (104 ) Cash collateral receivable — — 17 57 74 Total derivatives - net basis $ 8 $ 1 $ (14 ) $ (25 ) $ (30 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of December 31, 2018 and 2017 , a regulatory asset of $96 million and $101 million , respectively, was recorded related to the net derivative liability of $97 million and $104 million , respectively. The following table reconciles the beginning and ending balances of PacifiCorp's regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in regulatory assets, as well as amounts reclassified to earnings for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 101 $ 73 $ 133 Changes in fair value recognized in regulatory assets 12 47 (27 ) Net (losses) gains reclassified to operating revenue (68 ) 9 10 Net gains (losses) reclassified to energy costs 51 (28 ) (43 ) Ending balance $ 96 $ 101 $ 73 Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions): Unit of Measure 2018 2017 Electricity sales Megawatt hours (6 ) (9 ) Natural gas purchases Decatherms 117 113 Fuel oil purchases Gallons — — Credit Risk PacifiCorp is exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Credit risk may be concentrated to the extent PacifiCorp's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, PacifiCorp analyzes the financial condition of each significant wholesale counterparty, establishes limits on the amount of unsecured credit to be extended to each counterparty and evaluates the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, PacifiCorp enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtains third-party guarantees, letters of credit and cash deposits. If required, PacifiCorp exercises rights under these arrangements, including calling on the counterparty's credit support arrangement. Collateral and Contingent Features In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base certain collateral requirements on credit ratings for senior unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide bilateral rights to demand cash or other security if credit exposures on a net basis exceed specified rating-dependent threshold levels ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance" in the event of a material adverse change in PacifiCorp's creditworthiness. These rights can vary by contract and by counterparty. As of December 31, 2018 , PacifiCorp's credit ratings for its senior secured debt and its issuer credit ratings for senior unsecured debt by Moody's Investor Service and Standard & Poor's Rating Services were investment grade. The aggregate fair value of PacifiCorp's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $113 million and $110 million as of December 31, 2018 and 2017 , respectively, for which PacifiCorp had posted collateral of $61 million and $74 million , respectively, in the form of cash deposits. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of December 31, 2018 and 2017 , PacifiCorp would have been required to post $35 million and $34 million , respectively, of additional collateral. PacifiCorp's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation or other factors.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	12 Months Ended
	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements The carrying value of the Company's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. The Company has various financial assets and liabilities that are measured at fair value on the Consolidated Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. • Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 - Unobservable inputs reflect the Company's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. The Company develops these inputs based on the best information available, including its own data. The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ 1 $ 91 $ 108 $ (52 ) $ 148 Interest rate derivatives 1 13 10 — 24 Mortgage loans held for sale — 468 — — 468 Money market mutual funds (2) 409 — — — 409 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 1,441 — — — 1,441 Investment funds 128 — — — 128 $ 2,423 $ 625 $ 118 $ (52 ) $ 3,114 Liabilities: Commodity derivatives $ (1 ) $ (180 ) $ (9 ) $ 111 $ (79 ) Interest rate derivatives — (32 ) — — (32 ) $ (1 ) $ (212 ) $ (9 ) $ 111 $ (111 ) As of December 31, 2017: Assets: Commodity derivatives $ 1 $ 42 $ 104 $ (29 ) $ 118 Interest rate derivatives — 15 9 — 24 Mortgage loans held for sale — 465 — — 465 Money market mutual funds (2) 685 — — — 685 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 1,968 — — — 1,968 Investment funds 178 — — — 178 $ 3,296 $ 565 $ 113 $ (29 ) $ 3,945 Liabilities: Commodity derivatives $ (3 ) $ (167 ) $ (10 ) $ 105 $ (75 ) Interest rate derivatives — (8 ) — — (8 ) $ (3 ) $ (175 ) $ (10 ) $ 105 $ (83 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which the Company transacts. When quoted prices for identical contracts are not available, the Company uses forward price curves. Forward price curves represent the Company's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. The Company bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent brokers, exchanges, direct communication with market participants and actual transactions executed by the Company. Market price quotations are generally readily obtainable for the applicable term of the Company's outstanding derivative contracts; therefore, the Company's forward price curves reflect observable market quotes. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to the length of the contract. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, the Company uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. The Company's mortgage loans held for sale are valued based on independent quoted market prices, where available, or the prices of other mortgage whole loans with similar characteristics. As necessary, these prices are adjusted for typical securitization activities, including servicing value, portfolio composition, market conditions and liquidity. The Company's investments in money market mutual funds and debt and equity securities are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): Commodity Derivatives Interest Rate Derivatives Auction Rate Securities 2018 2017 2016 2018 2017 2016 2018 2017 2016 Beginning balance $ 94 $ 60 $ 47 $ 9 $ 6 $ 4 $ — $ — $ 44 Changes included in earnings 1 23 8 181 147 121 — — 5 Changes in fair value recognized in OCI 2 (3 ) (2 ) — — — — — 8 Changes in fair value recognized in net regulatory assets 3 (1 ) (11 ) — — — — — — Purchases 3 1 1 — 4 — — — — Redemptions — — — — — — — — (57 ) Settlements (4 ) 14 17 (180 ) (148 ) (119 ) — — — Ending balance $ 99 $ 94 $ 60 $ 10 $ 9 $ 6 $ — $ — $ — The Company's long-term debt is carried at cost, including fair value adjustments and unamortized premiums, discounts and debt issuance costs as applicable, on the Consolidated Financial Statements. The fair value of the Company's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of the Company's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of the Company's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,774 $ 39,398 $ 35,193 $ 40,522
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements The carrying value of PacifiCorp's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. PacifiCorp has various financial assets and liabilities that are measured at fair value on the Consolidated Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that PacifiCorp has the ability to access at the measurement date. • Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 - Unobservable inputs reflect PacifiCorp's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. PacifiCorp develops these inputs based on the best information available, including its own data. The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 51 $ — $ (23 ) $ 28 Money market mutual funds (2) 69 — — — 69 Investment funds 24 — — — 24 $ 93 $ 51 $ — $ (23 ) $ 121 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 82 $ (66 ) As of December 31, 2017: Assets: Commodity derivatives $ — $ 13 $ — $ (4 ) $ 9 Money market mutual funds (2) 21 — — — 21 Investment funds 21 — — — 21 $ 42 $ 13 $ — $ (4 ) $ 51 Liabilities - Commodity derivatives $ — $ (117 ) $ — $ 78 $ (39 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $74 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which PacifiCorp transacts. When quoted prices for identical contracts are not available, PacifiCorp uses forward price curves. Forward price curves represent PacifiCorp's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. PacifiCorp bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent energy brokers, exchanges, direct communication with market participants and actual transactions executed by PacifiCorp. Market price quotations for certain major electricity and natural gas trading hubs are generally readily obtainable for the first three years; therefore, PacifiCorp's forward price curves for those locations and periods reflect observable market quotes. Market price quotations for other electricity and natural gas trading hubs are not as readily obtainable for the first three years. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, PacifiCorp uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. Refer to Note 11 for further discussion regarding PacifiCorp's risk management and hedging activities. PacifiCorp's investments in money market mutual funds and investment funds are stated at fair value and are primarily accounted for as available-for-sale securities. When available, PacifiCorp uses a readily observable quoted market price or net asset value of an identical security in an active market to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. PacifiCorp's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of PacifiCorp's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of PacifiCorp's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,015 $ 7,833 $ 7,005 $ 8,370
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements The carrying value of MidAmerican Energy's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. MidAmerican Energy has various financial assets and liabilities that are measured at fair value on the Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that MidAmerican Energy has the ability to access at the measurement date. • Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 - Unobservable inputs reflect MidAmerican Energy's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. MidAmerican Energy develops these inputs based on the best information available, including its own data. The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 4 $ 2 $ (3 ) $ 3 Money market mutual funds (2) 2 — — — 2 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 6 — — — 6 Investment funds 10 — — — 10 $ 461 $ 57 $ 2 $ (3 ) $ 517 Liabilities: Commodity derivatives $ — $ (4 ) $ (2 ) $ 3 $ (3 ) Interest rate derivatives (3) — (19 ) — — (19 ) $ — $ (23 ) $ (2 ) $ 3 $ (22 ) As of December 31, 2017 Assets: Commodity derivatives $ — $ 3 $ 4 $ (2 ) $ 5 Money market mutual funds (2) 133 — — — 133 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 7 — — — 7 Investment funds 15 — — — 15 $ 619 $ 46 $ 4 $ (2 ) $ 667 Liabilities - commodity derivatives $ — $ (9 ) $ (1 ) $ 2 $ (8 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $- million as of December 31, 2018 and 2017 . (2) Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost. (3) The interest rate derivatives are interest rate locks related to MidAmerican Energy's January 2019 issuance of first mortgage bonds, at which time the interest rate locks were settled for $22 million. MidAmerican Energy's investments in money market mutual funds and debt and equity securities are stated at fair value, with debt securities primarily accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The following table reconciles the beginning and ending balances of MidAmerican Energy's assets measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): Commodity Derivatives Auction Rate Securities 2018 2017 2016 2018 2017 2016 Beginning balance $ 3 $ (2 ) $ (6 ) $ — $ — $ 26 Transfer to affiliate (1) — — (4 ) — — — Changes included in earnings — — — — — 5 Changes in fair value recognized in OCI — — — — — 4 Changes in fair value recognized in net regulatory assets (3 ) 2 (6 ) — — — Redemptions — — — — — (35 ) Settlements — 3 14 — — — Ending balance $ — $ 3 $ (2 ) $ — $ — $ — (1) On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE. MidAmerican Energy's long-term debt is carried at cost on the Financial Statements. The fair value of MidAmerican Energy's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Energy's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt as of December 31 (in millions): 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,381 $ 5,646 $ 5,042 $ 5,686
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements Refer to Note 12 of MidAmerican Energy's Notes to Financial Statements. MidAmerican Funding's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of MidAmerican Funding's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Funding's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Funding's long-term debt as of December 31 (in millions): 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,621 $ 5,943 $ 5,282 $ 6,006
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements The carrying value of Nevada Power 's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. Nevada Power has various financial assets and liabilities that are measured at fair value on the Consolidated Balance Sheets using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Nevada Power has the ability to access at the measurement date. • Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 - Unobservable inputs reflect Nevada Power 's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Nevada Power develops these inputs based on the best information available, including its own data. The following table presents Nevada Power 's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Total As of December 31, 2018: Assets: Commodity derivatives $ — $ — $ 7 $ 7 Money market mutual funds (1) 104 — — 104 Investment funds 1 — — 1 $ 105 $ — $ 7 $ 112 Liabilities - commodity derivatives $ — $ — $ (4 ) $ (4 ) As of December 31, 2017: Assets - investment funds $ 2 $ — $ — $ 2 Liabilities - commodity derivatives $ — $ — $ (3 ) $ (3 ) (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which Nevada Power transacts. When quoted prices for identical contracts are not available, Nevada Power uses forward price curves. Forward price curves represent Nevada Power 's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Nevada Power bases its forward price curves upon internally developed models, with internal and external fundamental data inputs. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to markets that are not active. Given that limited market data exists for these contracts, Nevada Power uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The model incorporates a mid-market pricing convention (the mid‑point price between bid and ask prices) as a practical expedient for valuing its assets and liabilities measured and reported at fair value. The determination of the fair value for derivative contracts not only includes counterparty risk, but also the impact of Nevada Power 's nonperformance risk on its liabilities, which as of December 31, 2018 , had an immaterial impact to the fair value of its derivative contracts. As such, Nevada Power considers its derivative contracts to be valued using Level 3 inputs. Nevada Power 's investments in money market mutual funds and equity securities are accounted for as available-for-sale securities and are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. The following table reconciles the beginning and ending balances of Nevada Power 's net commodity derivative assets or liabilities measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ (3 ) $ (14 ) $ (22 ) Changes in fair value recognized in regulatory assets or liabilities 4 (3 ) (4 ) Settlements 2 14 12 Ending balance $ 3 $ (3 ) $ (14 ) Nevada Power 's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of Nevada Power 's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of Nevada Power 's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of Nevada Power 's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,353 $ 2,651 $ 2,600 $ 3,088
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements [Text Block]	Fair Value Measurements The carrying value of Sierra Pacific 's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. Sierra Pacific has various financial assets and liabilities that are measured at fair value on the Balance Sheets using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Sierra Pacific has the ability to access at the measurement date. • Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 - Unobservable inputs reflect Sierra Pacific 's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Sierra Pacific develops these inputs based on the best information available, including its own data. The following table presents Sierra Pacific 's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Total As of December 31, 2018: Assets: Commodity derivatives $ — $ — $ 2 $ 2 Money market mutual funds (1) 45 — — 45 $ 45 $ — $ 2 $ 47 As of December 31, 2017: Assets - investment funds $ — $ — $ — $ — (1) Amounts are included in cash and cash equivalents on the Balance Sheets. The fair value of these money market mutual funds approximates cost. Sierra Pacific 's investments in money market mutual funds and equity securities are accounted for as available-for-sale securities and are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. Sierra Pacific 's long-term debt is carried at cost on the Balance Sheets. The fair value of Sierra Pacific 's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of Sierra Pacific 's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of Sierra Pacific 's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,167 $ 1,120 $ 1,221

Other, Net (Notes)

Other, Net (Notes)	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, Net [Text Block]	Other Income (Expense) - Other, Net Other, net, as shown on the Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Interest income and other, net 3 6 1 Total $ 30 $ 37 $ 29
MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, Net [Text Block]	Other Income (Expense) - Other, Net Other, net, as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Gains on sales of assets and other investments 1 1 3 Loss on debt tender offer — (29 ) — Interest income and other, net 3 6 3 Total $ 31 $ 9 $ 34 Refer to Note 8 for information regarding the debt tender offer.

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act The 2017 Tax Reform impacted many areas of income tax law. The most material items include the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018, the one-time repatriation tax of foreign earnings and profits and limitations on bonus depreciation for utility property. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of the 2017 Tax Reform, in December 2017, the Company reduced deferred income tax liabilities $7,115 million . As it is probable the change in deferred taxes for the Company's regulated businesses will be passed back to customers through regulatory mechanisms, the Company increased net regulatory liabilities by $5,950 million . The reduction in deferred income tax liabilities also resulted in a decrease in deferred income tax expense of $1,150 million , mostly driven by the Company's non-regulated businesses, primarily BHE Renewables, BHE's investment in BYD Company Limited and HomeServices. As a result of the 2017 Tax Reform, BHE's consolidated net income in 2017 increased by $516 million primarily due to benefits from reductions in deferred income tax liabilities of $1,150 million , partially offset by an accrual for the deemed repatriation of undistributed foreign earnings and profits totaling $419 million and equity earnings charges totaling $228 million mainly for amounts to be returned to the customers of equity investments in regulated entities. In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. The Company recorded the impacts of the 2017 Tax Reform in December 2017 and believed all the impacts to be complete with the exception of the repatriation tax on foreign earnings and interpretations of the bonus depreciation rules. The Company determined the amounts recorded and the interpretations relating to these two items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. The Company believed the estimates for the repatriation tax to be reasonable, however, additional time was required to validate the inputs to the foreign earnings and profits calculation, the basis on which the repatriation tax is determined and additional guidance was required to determine state income tax implications. The Company also believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018 , the Company finalized its provisional amounts resulting in a $134 million reduction to the repatriation tax liability estimate, based on further analysis of the earnings and profits completed during 2018 and additional guidance from certain states. In addition, the Company recorded a current tax benefit and deferred tax expense of $68 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform and the nature of the Company's regulated businesses, the Company reduced the associated deferred income tax liabilities $27 million and increased regulatory liabilities by the same amount. Iowa Senate File 2417 In May 2018, Iowa Senate File 2417 was signed into law, which, among other items, reduces the state of Iowa corporate tax rate from 12% to 9.8% and eliminates corporate federal deductibility, both for tax years starting in 2021. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of Iowa Senate File 2417, the Company reduced deferred income tax liabilities $61 million and decreased deferred income tax expense by $2 million . As it is probable the change in deferred taxes for the Company's regulated businesses will be passed back to customers through regulatory mechanisms, the Company increased net regulatory liabilities by $59 million . In connection with Iowa Senate File 2417, the Company determined it was more appropriate to present the deferred income tax assets of $609 million associated with the state of Iowa net operating loss carryforward as a long-term income tax receivable from Berkshire Hathaway as a component of BHE's shareholders' equity. As the Company does not currently expect to receive the majority of the income tax amounts from Berkshire Hathaway related to the state of Iowa prior to the 2021 effective date, the Company remeasured the long-term income tax receivable with Berkshire Hathaway at the enactment date and recorded a decrease to the long-term income tax receivable from Berkshire Hathaway of $115 million . Subsequent to the remeasurement date, the Company amended the tax sharing agreement with Berkshire Hathaway and received $90 million in 2019 related to previously used state of Iowa net operating loss carryforwards thereby increasing the current income tax receivable from Berkshire Hathaway and decreasing the long-term income tax receivable by the same amount. Additionally, during the year the Company generated $53 million of state of Iowa net operating losses which will be carried forward and will increase the long-term income tax receivable from Berkshire Hathaway. Income tax (benefit) expense consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (686 ) $ (653 ) $ (743 ) State (9 ) (3 ) 1 Foreign 104 83 55 (591 ) (573 ) (687 ) Deferred: Federal 165 (76 ) 1,164 State (131 ) 100 (59 ) Foreign (20 ) 2 (7 ) 14 26 1,098 Investment tax credits (6 ) (7 ) (8 ) Total $ (583 ) $ (554 ) $ 403 A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax (benefit) expense is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (30 ) (20 ) (14 ) Effects of ratemaking (8 ) (1 ) — State income tax, net of federal income tax benefit (6 ) 3 (1 ) Effects of tax rate change and repatriation tax (4 ) (31 ) — Income tax effect of foreign income (3 ) (5 ) (6 ) Equity income 1 (2 ) 2 Other, net (1 ) (1 ) (2 ) Effective income tax rate (30 )% (22 )% 14 % Effects of 2017 Tax Reform have been included in state income tax, net of federal income tax benefit, effects of tax rate change and repatriation tax and equity income. Income tax credits relate primarily to production tax credits from wind-powered generating facilities owned by MidAmerican Energy, PacifiCorp and BHE Renewables. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Income tax effect of foreign income includes, among other items, deferred income tax benefits of $16 million in 2016 related to the enactment of reductions in the United Kingdom corporate income tax rate. In September 2016, the corporate income tax rate was reduced from 18% to 17% effective April 1, 2020. The Company's provision for income taxes has been computed on a stand-alone basis. Berkshire Hathaway includes the Company in its consolidated United States federal and Iowa state income tax returns and substantially all of the Company's United States federal income tax is remitted to or received from Berkshire Hathaway. As of December 31, 2018 , the Company had a current income tax receivable from Berkshire Hathaway of $90 million and a long-term income tax receivable from Berkshire Hathaway, reflected as a component of BHE's shareholders' equity, of $457 million for Iowa state income tax. As of December 31, 2017 , the Company had a current income tax receivable from Berkshire Hathaway for federal income tax of $334 million . The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 1,674 $ 1,707 Federal, state and foreign carryforwards 596 1,118 AROs 232 223 Employee benefits 68 45 Other 459 450 Total deferred income tax assets 3,029 3,543 Valuation allowances (137 ) (126 ) Total deferred income tax assets, net 2,892 3,417 Deferred income tax liabilities: Property-related items (10,185 ) (9,950 ) Investments (876 ) (843 ) Regulatory assets (656 ) (651 ) Other (222 ) (215 ) Total deferred income tax liabilities (11,939 ) (11,659 ) Net deferred income tax liability $ (9,047 ) $ (8,242 ) The following table provides the Company's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions): Federal State Foreign Total Net operating loss carryforwards (1) $ 284 $ 5,577 $ 562 $ 6,423 Deferred income taxes on net operating loss carryforwards $ 60 $ 312 $ 151 $ 523 Expiration dates 2023-2026 2019-2038 2035-2038 Tax credits $ 45 $ 28 $ — $ 73 Expiration dates 2023- indefinite 2019- indefinite (1) The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023. The United States Internal Revenue Service has closed its examination of the Company's income tax returns through December 31, 2011. The statute of limitations for the Company's income tax returns have expired through December 31, 2009, for California, Minnesota, Montana, Nebraska, Oregon and Utah, and through December 31, 2014, except for the impact of any federal audit adjustments, for Idaho, Illinois, Iowa and Kansas. The closure of examinations, or the expiration of the statute of limitations, for state filings may not preclude the state from adjusting the state net operating loss carryforward utilized in a year for which the statute of limitations is not closed. A reconciliation of the beginning and ending balances of the Company's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 181 $ 128 Additions based on tax positions related to the current year 4 6 Additions for tax positions of prior years 38 70 Reductions for tax positions of prior years (38 ) (18 ) Statute of limitations 2 (4 ) Settlements (2 ) (1 ) Ending balance $ 185 $ 181 As of December 31, 2018 and 2017 , the Company had unrecognized tax benefits totaling $154 million and $158 million , respectively, that if recognized, would have an impact on the effective tax rate. The remaining unrecognized tax benefits relate to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility. Recognition of these tax benefits, other than applicable interest and penalties, would not affect the Company's effective income tax rate.
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act The Tax Cuts and Jobs Act enacted on December 22, 2017 ("2017 Tax Reform") impacted many areas of income tax law. The most material items included the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018 and limitations on bonus depreciation for utility property. In December 2017, the SEC issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. On December 31, 2017, PacifiCorp recorded the impacts of the 2017 Tax Reform and believed all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. PacifiCorp determined the amounts recorded and the interpretations relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. PacifiCorp believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018, PacifiCorp finalized its provisional amounts recording a current tax benefit and deferred tax expense of $21 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform and PacifiCorp's regulatory nature, PacifiCorp reduced the associated deferred income tax liabilities $8 million and increased regulatory liabilities by the same amount. Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ 164 $ 249 $ 169 State 40 41 32 Total 204 290 201 Deferred: Federal (187 ) 59 123 State (9 ) 15 21 Total (196 ) 74 144 Investment tax credits (3 ) (4 ) (5 ) Total income tax expense $ 5 $ 360 $ 340 A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % State income taxes, net of federal income tax benefit 4 3 3 Amortization of excess deferred income taxes (17 ) — — Federal income tax credits (7 ) (5 ) (6 ) Other — (1 ) (1 ) Effective income tax rate 1 % 32 % 31 % Income tax credits relate primarily to production tax credits earned by PacifiCorp's wind-powered generating facilities. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Amortization of excess deferred income taxes is primarily attributable to the amortization of $127 million of Utah allocated excess deferred income taxes pursuant to a 2017 Tax Reform settlement approved by the UPSC, whereby a portion of Utah allocated excess deferred income taxes was used to accelerate depreciation on Utah's share of certain thermal plant units. The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 752 $ 756 Employee benefits 91 84 Derivative contracts and unamortized contract values 45 48 State carryforwards 77 83 Asset retirement obligations 53 50 Other 56 50 1,074 1,071 Deferred income tax liabilities: Property, plant and equipment (3,335 ) (3,381 ) Regulatory assets (273 ) (261 ) Other (9 ) (11 ) (3,617 ) (3,653 ) Net deferred income tax liability $ (2,543 ) $ (2,582 ) The following table provides PacifiCorp's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions): State Net operating loss carryforwards $ 1,230 Deferred income taxes on net operating loss carryforwards $ 58 Expiration dates 2019 - 2032 Tax credit carryforwards $ 19 Expiration dates 2019 - indefinite The United States Internal Revenue Service has closed its examination of PacifiCorp's income tax returns through December 31, 2011. The statute of limitations for PacifiCorp's state income tax returns have expired through December 31, 2009, with the exception of Idaho, for which the statute of limitations has expired through December 31, 2014, except for the impact of any federal audit adjustments. The statute of limitations expiring for state filings may not preclude the state from adjusting the state net operating loss carryforward utilized in a year for which the statute of limitations is not closed. As of December 31, 2018 and 2017 , PacifiCorp had unrecognized tax benefits totaling $1 million and $10 million , respectively, related to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility. Recognition of these tax benefits, other than applicable interest and penalties, would not affect PacifiCorp's effective income tax rate.
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act The 2017 Tax Reform impacts many areas of income tax law. The most material items include the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018 and limitations on bonus depreciation for utility property. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of the 2017 Tax Reform, MidAmerican Energy reduced deferred income tax liabilities $1,824 million . As it is probable the change in deferred taxes will be passed back to customers through regulatory mechanisms, MidAmerican Energy increased net regulatory liabilities by $1,845 million . In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. On December 31, 2017, MidAmerican Energy recorded the impacts of 2017 Tax Reform and believed all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Energy determined the amounts recorded and the interpretations relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. MidAmerican Energy believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018, MidAmerican Energy recorded a current tax benefit of $27 million and a deferred tax expense of $28 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform, MidAmerican Energy reduced the associated deferred income tax liabilities $12 million and increased regulatory liabilities by the same amount. MidAmerican Energy's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (276 ) $ (490 ) $ (479 ) State (12 ) (25 ) (14 ) (288 ) (515 ) (493 ) Deferred: Federal 42 335 366 State (8 ) (2 ) (4 ) 34 333 362 Investment tax credits (1 ) (1 ) (1 ) Total $ (255 ) $ (183 ) $ (132 ) Iowa Senate File 2417 In May 2018, Iowa Senate File 2417 was signed into law, which, among other items, reduces the state of Iowa corporate tax rate from 12% to 9.8% and eliminates corporate federal deductibility, both for tax years starting in 2021. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of Iowa Senate File 2417, MidAmerican Energy reduced net deferred income tax liabilities $54 million and decreased deferred income tax benefit by $2 million . As it is probable the change in deferred taxes for MidAmerican Energy will be passed back to customers through regulatory mechanisms, MidAmerican Energy increased net regulatory liabilities by $56 million . A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (73 ) (68 ) (61 ) State income tax, net of federal income tax benefit (4 ) (4 ) (3 ) Effects of ratemaking (5 ) (7 ) (3 ) 2017 Tax Reform 1 2 — Other, net — (1 ) — Effective income tax rate (60 )% (43 )% (32 )% Income tax credits relate primarily to production tax credits earned by MidAmerican Energy's wind-powered generating facilities. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. MidAmerican Energy's net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 405 $ 443 Asset retirement obligations 164 160 Employee benefits 47 45 Other 80 57 Total deferred income tax assets 696 705 Deferred income tax liabilities: Depreciable property (2,945 ) (2,865 ) Regulatory assets (61 ) (42 ) Other (12 ) (35 ) Total deferred income tax liabilities (3,018 ) (2,942 ) Net deferred income tax liability $ (2,322 ) $ (2,237 ) As of December 31, 2018 , MidAmerican Energy has available $44 million of state tax carryforwards, principally related to $655 million of net operating losses, that expire at various intervals between 2019 and 2037 . The United States Internal Revenue Service has closed its examination of MidAmerican Energy's income tax returns through December 31, 2011. The statute of limitations for MidAmerican Energy's state income tax returns have expired through December 31, 2009, with the exception of Iowa and Illinois, for which the statute of limitations have expired through December 31, 2014, except for the impact of any federal audit adjustments. The statute of limitations expiring for state filings may not preclude the state from adjusting the state net operating loss carryforward utilized in a year for which the statute of limitations is not closed. A reconciliation of the beginning and ending balances of MidAmerican Energy's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 12 $ 10 Additions based on tax positions related to the current year 4 1 Additions for tax positions of prior years 47 23 Reductions based on tax positions related to the current year (4 ) (4 ) Reductions for tax positions of prior years (48 ) (19 ) Interest and penalties (1 ) 1 Ending balance $ 10 $ 12 As of December 31, 2018 , MidAmerican Energy had unrecognized tax benefits totaling $29 million that, if recognized, would have an impact on the effective tax rate. The remaining unrecognized tax benefits relate to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility. Recognition of these tax benefits, other than applicable interest and penalties, would not affect MidAmerican Energy's effective income tax rate.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act On December 22, 2017, the Tax Cuts and Jobs Act ("2017 Tax Reform") was signed into law, which impacts many areas of income tax law. The most material items include the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018 and limitations on bonus depreciation for utility property. Accounting principles generally accepted in the United States of America ("GAAP") require the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of the 2017 Tax Reform, MidAmerican Funding reduced deferred income tax liabilities $1,822 million . As it is probable the change in deferred taxes for the MidAmerican Funding's regulated businesses will be passed back to customers through regulatory mechanisms, MidAmerican Funding increased net regulatory liabilities by $1,845 million . In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. On December 31, 2017, MidAmerican Funding recorded the impacts of 2017 Tax Reform and believed all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Funding determined the amounts recorded and the interpretations relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. MidAmerican Funding believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018, MidAmerican Funding recorded a current tax benefit of $27 million and a deferred tax expense of $28 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform, MidAmerican Funding reduced the associated deferred income tax liabilities $12 million and increased regulatory liabilities by the same amount. MidAmerican Funding's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (280 ) $ (505 ) $ (485 ) State (14 ) (31 ) (16 ) (294 ) (536 ) (501 ) Deferred: Federal 42 338 367 State (9 ) (3 ) (4 ) 33 335 363 Investment tax credits (1 ) (1 ) (1 ) Total $ (262 ) $ (202 ) $ (139 ) Iowa Senate File 2417 In May 2018, Iowa Senate File 2417 was signed into law, which, among other items, reduces the state of Iowa corporate tax rate from 12% to 9.8% and eliminates corporate federal deductibility, both for tax years starting in 2021. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of Iowa Senate File 2417, MidAmerican Funding reduced net deferred income tax liabilities $54 million and decreased deferred income tax benefit by $2 million . As it is probable the change in deferred taxes for MidAmerican Energy will be passed back to customers through regulatory mechanisms, MidAmerican Funding increased net regulatory liabilities by $56 million . A reconciliation of the federal statutory income tax rate MidAmerican Funding's the effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (76 ) (77 ) (64 ) State income tax, net of federal income tax benefit (4 ) (6 ) (3 ) Effects of ratemaking (6 ) (8 ) (3 ) 2017 Tax Reform 1 3 — Other, net — (1 ) — Effective income tax rate (64 )% (54 )% (35 )% Income tax credits relate primarily to production tax credits earned by MidAmerican Energy's wind-powered generating facilities. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 405 $ 443 Asset retirement obligations 164 160 Employee benefits 47 45 Other 85 62 Total deferred income tax assets 701 710 Deferred income tax liabilities: Depreciable property (2,947 ) (2,868 ) Regulatory assets (62 ) (42 ) Other (11 ) (35 ) Total deferred income tax liabilities (3,020 ) (2,945 ) Net deferred income tax liability $ (2,319 ) $ (2,235 ) As of December 31, 2018 , MidAmerican Funding has available $44 million of state tax carryforwards, principally related to $655 million of net operating losses, that expire at various intervals between 2019 and 2037 . The United States Internal Revenue Service has closed its examination MidAmerican Funding’s income tax returns through December 31, 2011. The statute of limitations for MidAmerican Funding’s state income tax returns have expired through December 31, 2009, with the exception of Iowa and Illinois, for which the statute of limitations have expired through December 31, 2014, except for the impact of any federal audit adjustments. The statute of limitations expiring for state filings may not preclude the state from adjusting the state net operating loss carryforward utilized in a year for which the statute of limitations is not closed. A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 12 $ 10 Additions based on tax positions related to the current year 4 1 Additions for tax positions of prior years 47 23 Reductions based on tax positions related to the current year (4 ) (4 ) Reductions for tax positions of prior years (48 ) (19 ) Interest and penalties (1 ) 1 Ending balance $ 10 $ 12 As of December 31, 2018 , MidAmerican Funding had unrecognized tax benefits totaling $30 million that, if recognized, would have an impact on the effective tax rate. The remaining unrecognized tax benefits relate to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility. Recognition of these tax benefits, other than applicable interest and penalties, would not affect MidAmerican Funding's effective income tax rate.
Nevada Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act The 2017 Tax Reform impacts many areas of income tax law. The most material items include the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018, limitations on bonus depreciation for utility property and the elimination of the deduction for production activities. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of the 2017 Tax Reform, Nevada Power reduced deferred income tax liabilities $787 million . As it was probable the change in deferred taxes would be passed back to customers through regulatory mechanisms, Nevada Power increased net regulatory liabilities by $792 million . In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. Nevada Power recorded the impacts of the 2017 Tax Reform in December 2017 and believed all the impacts to be complete with the exception of the interpretation of the bonus depreciation rules. Nevada Power determined the amounts recorded and the interpretation relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Nevada Power believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018 , Nevada Power finalized its provisional amounts and recorded a current tax benefit and deferred tax expense of $12 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform and Nevada Power's regulatory nature, Nevada Power reduced the associated deferred income tax liabilities $5 million and increased regulatory liabilities by the same amount. Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current – Federal $ 84 $ 62 $ 68 Deferred – Federal (13 ) 95 79 Uncertain tax positions 2 — — Investment tax credits (1 ) (1 ) (1 ) Total income tax expense $ 72 $ 156 $ 146 A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31 : 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Non-deductible expenses 3 — — Effect of ratemaking — 1 — Effect of tax rate change — 1 — Other — 1 (1 ) Effective income tax rate 24 % 38 % 34 % The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 209 $ 201 Capital and financial leases 97 100 Employee benefits 15 18 Customer advances 18 14 Other 9 6 Total deferred income tax assets 348 339 Deferred income tax liabilities: Property related items (799 ) (796 ) Regulatory assets (196 ) (206 ) Capital and financial leases (94 ) (97 ) Other (8 ) (7 ) Total deferred income tax liabilities (1,097 ) (1,106 ) Net deferred income tax liability $ (749 ) $ (767 ) The United States Internal Revenue Service has closed its examination of NV Energy ’s consolidated income tax returns through December 31, 2008, and the statute of limitations has expired for NV Energy ’s consolidated income tax returns through the short year ended December 19, 2013. The statute of limitations expiring may not preclude the Internal Revenue Service from adjusting the federal net operating loss carryforward utilized in a year for which the examination is not closed.
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes [Text Block]	Income Taxes Tax Cuts and Jobs Act The 2017 Tax Reform impacts many areas of income tax law. The most material items include the reduction of the federal corporate tax rate from 35% to 21% effective January 1, 2018, limitations on bonus depreciation for utility property and the elimination of the deduction for production activities. GAAP requires the effect on deferred tax assets and liabilities of a change in tax rates be recognized in the period the tax rate change was enacted. As a result of the 2017 Tax Reform, Sierra Pacific reduced deferred income tax liabilities $342 million . As it was probable the change in deferred taxes would be passed back to customers through regulatory mechanisms, Sierra Pacific increased net regulatory liabilities by $341 million . In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of the 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. Sierra Pacific recorded the impacts of the 2017 Tax Reform in December 2017 and believed all the impacts to be complete with the exception of the interpretation of the bonus depreciation rules. Sierra Pacific determined the amounts recorded and the interpretation relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Sierra Pacific believed its interpretations for bonus depreciation to be reasonable, however, clarifying guidance was needed. During 2018 , Sierra Pacific finalized its provisional amounts and recorded a current tax benefit and deferred tax expense of $4 million following clarifying bonus depreciation guidance. As a result of 2017 Tax Reform and Sierra Pacific's regulatory nature, Sierra Pacific reduced the associated deferred income tax liabilities $2 million and increased regulatory liabilities by the same amount. Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current – Federal $ 23 $ — $ — Deferred – Federal 7 56 50 Uncertain tax positions 1 — — Investment tax credits (1 ) (1 ) (1 ) Total income tax expense $ 30 $ 55 $ 49 A reconciliation of the federal statutory income rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31 : 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Non-deductible expenses 4 — — Effects of ratemaking — — 1 Effect of tax rate change — (1 ) — Other — — 1 Effective income tax rate 25 % 34 % 37 % The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 70 $ 67 Federal net operating loss and credit carryforwards — 10 Employee benefit plans 10 10 Capital and financial leases 8 7 Customer Advances 8 7 Other 6 6 Total deferred income tax assets 102 107 Deferred income tax liabilities: Property related items (346 ) (349 ) Regulatory assets (73 ) (74 ) Capital and financial leases (8 ) (7 ) Other (6 ) (7 ) Total deferred income tax liabilities (433 ) (437 ) Net deferred income tax liability $ (331 ) $ (330 ) The United States Internal Revenue Service has closed its examination of NV Energy ’s consolidated income tax returns through December 31, 2008, and the statute of limitations has expired for NV Energy ’s consolidated income tax returns through the short year ended December 19, 2013. The statute of limitations expiring may not preclude the Internal Revenue Service from adjusting the federal net operating loss carryforward utilized in a year for which the examination is not closed.

Supplemental Cash Flow Disclosu

Supplemental Cash Flow Disclosures Supplemental Cash Flow Disclosures (Notes)	12 Months Ended
	Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Disclosures Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements and debt service obligations for certain of the Company's nonregulated renewable energy projects. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): As of December 31, 2018 2017 Cash and cash equivalents $ 627 $ 935 Restricted cash and cash equivalents 227 327 Investments and restricted cash and cash equivalents and investments 29 21 Total cash and cash equivalents and restricted cash and cash equivalents $ 883 $ 1,283 The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information: Interest paid, net of amounts capitalized $ 1,713 $ 1,715 $ 1,673 Income taxes received, net (1) $ 780 $ 540 $ 1,016 Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 823 $ 653 $ 547 Common stock exchanged for junior subordinated debentures $ — $ 100 $ — (1) Includes $884 million , $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018 , 2017 and 2016 , respectively.
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Disclosures Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and 2017 , as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): 2018 2017 Cash and cash equivalents $ 77 14 Restricted cash included in other current assets 13 13 Restricted cash included in other assets 2 2 Total cash and cash equivalents and restricted cash and cash equivalents $ 92 $ 29 The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Interest paid, net of amounts capitalized $ 347 $ 350 $ 350 Income taxes paid, net $ 144 $ 340 $ 201 Supplemental disclosure of non-cash investing and financing activities: Accounts payable related to property, plant and equipment additions $ 184 $ 147 $ 101
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Disclosures Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of December 31, 2018 and 2017 , consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and 2017 as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Balance Sheets (in millions): As of December 31, 2018 2017 Cash and cash equivalents $ — $ 172 Restricted cash and cash equivalents in other current assets 56 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 56 $ 282 The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental cash flow information: Interest paid, net of amounts capitalized $ 198 $ 193 $ 181 Income taxes received, net $ 494 $ 465 $ 601 Supplemental disclosure of non-cash investing transactions: Accounts payable related to utility plant additions $ 371 $ 224 $ 131 Dividend of unregulated retail services business $ — $ — $ 90
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Information Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of December 31, 2018 and 2017 , consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and 2017 as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): As of December 31, 2018 2017 Cash and cash equivalents $ 1 $ 172 Restricted cash and cash equivalents in other current assets 56 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 57 $ 282 The summary of supplemental cash flow information as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental cash flow information: Interest paid, net of amounts capitalized $ 218 $ 218 $ 204 Income taxes received, net $ 511 $ 472 $ 609 Supplemental disclosure of non-cash investing transactions: Accounts payable related to utility plant additions $ 371 $ 224 $ 131 Transfer of unregulated retail services business to affiliate $ — $ — $ 90
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Disclosures Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , consist of funds restricted by the Public Utilities Commission of Nevada ("PUCN") for a certain renewable energy contract. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): As of December 31, December 31, 2018 2017 Cash and cash equivalents $ 111 $ 57 Restricted cash and cash equivalents included in other current assets 10 9 Total cash and cash equivalents and restricted cash and cash equivalents $ 121 $ 66 The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information - Interest paid, net of amounts capitalized $ 166 $ 167 $ 173 Income taxes paid $ 117 $ 89 $ — Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 34 $ 18 $ 19 Capital and financial lease obligations incurred $ 1 $ — $ (1 )
Sierra Pacific Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Supplemental Cash Flow Disclosures [Text Block]	Supplemental Cash Flow Disclosures Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , consist of funds restricted by the Public Utilities Commission of Nevada ("PUCN") for a certain renewable energy contract. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Balance Sheets (in millions): As of December 31, December 31, 2018 2017 Cash and cash equivalents $ 71 $ 4 Restricted cash and cash equivalents included in other current assets 5 4 Total cash and cash equivalents and restricted cash and cash equivalents $ 76 $ 8 The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information - Interest paid, net of amounts capitalized $ 41 $ 40 $ 47 Income taxes paid $ 19 $ — $ — Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 15 $ 10 $ 15 Capital and financial lease obligations incurred $ 6 $ 1 $ —

Related Party Transactions Rela

Related Party Transactions Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2018
PacifiCorp [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	PacifiCorp has an intercompany administrative services agreement with BHE and its subsidiaries. Amounts charged to PacifiCorp by BHE and its subsidiaries under this agreement totaled $12 million , $11 million and $10 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. Payables associated with these administrative services were immaterial as of December 31, 2018 and 2017 , respectively. Amounts charged by PacifiCorp to BHE and its subsidiaries under this agreement, as well as receivables associated with these administrative services, were immaterial during the years ended December 31, 2018 , 2017 and 2016 , respectively. PacifiCorp also engages in various transactions with several subsidiaries of BHE in the ordinary course of business. Services provided by these subsidiaries in the ordinary course of business and charged to PacifiCorp primarily relate to wholesale electricity purchases and transmission of electricity, transportation of natural gas and employee relocation services. These expenses totaled $8 million , $6 million and $7 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. Payables associated with these services were immaterial as of December 31, 2018 and 2017 , respectively. Amounts charged by PacifiCorp to subsidiaries of BHE for wholesale electricity sales in the ordinary course of business were immaterial during the years ended December 31, 2018 , 2017 and 2016 , respectively. PacifiCorp has long-term transportation contracts with BNSF Railway Company ("BNSF"), an indirect wholly owned subsidiary of Berkshire Hathaway, PacifiCorp's ultimate parent company. Transportation costs under these contracts were $33 million , $35 million and $37 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. As of December 31, 2018 and 2017 , PacifiCorp had immaterial amounts of accounts payable to BNSF outstanding under these contracts, including indirect payables related to a jointly owned facility. PacifiCorp is party to a tax-sharing agreement and is part of the Berkshire Hathaway consolidated United States federal income tax return. As of December 31, 2018 , federal and state income taxes payable to BHE were $10 million , and as of December 31, 2017 , federal and state income taxes receivable from BHE were $59 million . For the years ended December 31, 2018 , 2017 and 2016 , cash paid for federal and state income taxes to BHE totaled $144 million , $340 million and $201 million , respectively. PacifiCorp transacts with its equity investees, Bridger Coal and Trapper Mining Inc. During the years ended December 31, 2018 , 2017 and 2016 , PacifiCorp charged Bridger Coal immaterial amounts, primarily for administrative support and management services, as well as materials, provided by PacifiCorp to Bridger Coal. Receivables for these services, as well as for certain expenses paid by PacifiCorp and reimbursed by Bridger Coal, were immaterial as of December 31, 2018 and 2017 , respectively. Services provided by equity investees to PacifiCorp primarily relate to coal purchases. During the years ended December 31, 2018 , 2017 and 2016 , coal purchases from PacifiCorp's equity investees totaled $163 million , $170 million and $174 million , respectively. Payables to PacifiCorp's equity investees were $13 million and $18 million as of December 31, 2018 and 2017 , respectively.
MidAmerican Energy Company [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions The companies identified as affiliates of MidAmerican Energy are Berkshire Hathaway and its subsidiaries, including BHE and its subsidiaries. The basis for the following transactions is provided for in service agreements between MidAmerican Energy and the affiliates. MidAmerican Energy is reimbursed for charges incurred on behalf of its affiliates. The majority of these reimbursed expenses are for general costs, such as insurance and building rent, and for employee wages, benefits and costs related to corporate functions such as information technology, human resources, treasury, legal and accounting. The amount of such reimbursements was $51 million , $53 million and $41 million for 2018 , 2017 and 2016 , respectively. Additionally, in 2018, MidAmerican Energy received $15 million from BHE for the transfer of corporate aircraft. MidAmerican Energy reimbursed BHE in the amount of $11 million , $9 million and $6 million in 2018 , 2017 and 2016 , respectively, for its share of corporate expenses. MidAmerican Energy purchases natural gas transportation and storage capacity services from Northern Natural Gas Company, a wholly owned subsidiary of BHE, and coal transportation services from BNSF Railway Company, an indirect wholly owned subsidiary of Berkshire Hathaway, in the normal course of business at either tariffed or market prices. These purchases totaled $127 million , $122 million and $135 million in 2018 , 2017 and 2016 , respectively. MidAmerican Energy had accounts receivable from affiliates of $8 million and $9 million as of December 31, 2018 and 2017 , respectively, that are included in receivables on the Balance Sheets. MidAmerican Energy also had accounts payable to affiliates of $12 million and $16 million as of December 31, 2018 and 2017 , respectively, that are included in accounts payable on the Balance Sheets. MidAmerican Energy is party to a tax-sharing agreement and is part of the Berkshire Hathaway consolidated United States federal income tax return. For current federal and state income taxes, MidAmerican Energy had a payable to BHE of $156 million as of December 31, 2018 , and a receivable from BHE of $51 million as of December 31, 2017 . MidAmerican Energy received net cash receipts for federal and state income taxes from BHE totaling $494 million , $465 million and $601 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. MidAmerican Energy recognizes the full amount of the funded status for its pension and postretirement plans, and amounts attributable to MidAmerican Energy's affiliates that have not previously been recognized through income are recognized as an intercompany balance with such affiliates. MidAmerican Energy adjusts these balances when changes to the funded status of the respective plans are recognized and does not intend to settle the balances currently. Amounts receivable from affiliates attributable to the funded status of employee benefit plans totaled $20 million and $16 million as of December 31, 2018 and 2017 , respectively, and similar amounts payable to affiliates totaled $36 million and $45 million as of December 31, 2018 and 2017 , respectively. See Note 10 for further information pertaining to pension and postretirement accounting.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions The companies identified as affiliates of MidAmerican Funding are Berkshire Hathaway and its subsidiaries, including BHE and its subsidiaries. The basis for the following transactions is provided for in service agreements between MidAmerican Funding and the affiliates. MidAmerican Funding is reimbursed for charges incurred on behalf of its affiliates. The majority of these reimbursed expenses are for allocated general costs, such as insurance and building rent, and for employee wages, benefits and costs for corporate functions, such as information technology, human resources, treasury, legal and accounting. The amount of such reimbursements was $44 million , $46 million and $35 million for 2018 , 2017 and 2016 , respectively. Additionally, in 2018, MidAmerican Funding received $15 million from BHE for the transfer of corporate aircraft. MidAmerican Funding reimbursed BHE in the amount of $11 million , $9 million and $6 million in 2018 , 2017 and 2016 , respectively, for its share of corporate expenses. MidAmerican Energy purchases natural gas transportation and storage capacity services from Northern Natural Gas Company, a wholly owned subsidiary of BHE, and coal transportation services from BNSF Railway Company, a wholly-owned subsidiary of Berkshire Hathaway, in the normal course of business at either tariffed or market prices. These purchases totaled $127 million , $122 million and $135 million in 2018 , 2017 and 2016 , respectively. MHC has a $300 million revolving credit arrangement carrying interest at the 30-day LIBOR rate plus a spread to borrow from BHE. Outstanding balances are unsecured and due on demand. The outstanding balance was $156 million at an interest rate of 2.629% as of December 31, 2018 , and $164 million at an interest rate of 1.629% as of December 31, 2017 , and is reflected as note payable to affiliate on the Consolidated Balance Sheet. BHE has a $100 million revolving credit arrangement, carrying interest at the 30-day LIBOR rate plus a spread to borrow from MHC. Outstanding balances are unsecured and due on demand. There were no borrowings outstanding throughout 2018 and 2017 . MidAmerican Funding had accounts receivable from affiliates of $5 million and $9 million as of December 31, 2018 and 2017 , respectively, that are included in receivables, net on the Consolidated Balance Sheets. MidAmerican Funding also had accounts payable to affiliates of $12 million and $14 million as of December 31, 2018 and 2017 , respectively, that are included in accounts payable on the Consolidated Balance Sheets. MidAmerican Funding is party to a tax-sharing agreement and is part of the Berkshire Hathaway consolidated United States federal income tax return. For current federal and state income taxes, MidAmerican Funding had a payable to BHE of $156 million as of December 31, 2018 , and a receivable from BHE of $64 million as of December 31, 2017 . MidAmerican Funding received net cash receipts for federal and state income taxes from BHE totaling $511 million , $472 million and $609 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. MidAmerican Funding recognizes the full amount of the funded status for its pension and postretirement plans, and amounts attributable to MidAmerican Funding's affiliates that have not previously been recognized through income are recognized as an intercompany balance with such affiliates. MidAmerican Funding adjusts these balances when changes to the funded status of the respective plans are recognized and does not intend to settle the balances currently. Amounts receivable from affiliates attributable to the funded status of employee benefit plans totaled $20 million and $16 million as of December 31, 2018 and 2017 , respectively, and similar amounts payable to affiliates totaled $36 million and $45 million as of December 31, 2018 and 2017 , respectively. See Note 10 for further information pertaining to pension and postretirement accounting. The indenture pertaining to MidAmerican Funding's long-term debt restricts MidAmerican Funding from paying a distribution on its equity securities, unless after making such distribution either its debt to total capital ratio does not exceed 0.67:1 and its interest coverage ratio is not less than 2.2:1 or its senior secured long-term debt rating is at least BBB or its equivalent. MidAmerican Funding may seek a release from this restriction upon delivery to the indenture trustee of written confirmation from the ratings agencies that without this restriction MidAmerican Funding's senior secured long-term debt would be rated at least BBB+.
Nevada Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions Nevada Power has an intercompany administrative services agreement with BHE and its subsidiaries. Amounts charged to Nevada Power under this agreement totaled $2 million for the years ended December 31 , 2018 , 2017 and 2016 . Kern River Gas Transmission Company, an indirect subsidiary of BHE , provided natural gas transportation and other services to Nevada Power of $58 million , $66 million and $68 million for the years ended December 31 , 2018 , 2017 and 2016 . As of December 31 , 2018 and 2017 , Nevada Power 's Consolidated Balance Sheets included amounts due to Kern River Gas Transmission Company of $4 million and $5 million , respectively. Nevada Power provided electricity and other services to PacifiCorp , an indirect subsidiary of BHE , of $3 million , $3 million and $2 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Receivables associated with these services were $- million as of December 31 , 2018 and 2017 . PacifiCorp provided electricity and the sale of renewable energy credits to Nevada Power of $- million for the years ended December 31 , 2018 , 2017 and 2016 . Payables associated with these transactions were $- million as of December 31 , 2018 and 2017 . Nevada Power provided electricity to Sierra Pacific of $91 million , $104 million and $78 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Receivables associated with these transactions were $6 million and $10 million as of December 31 , 2018 and 2017 , respectively. Nevada Power purchased electricity from Sierra Pacific of $28 million , $21 million and $17 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Payables associated with these transactions were $1 million and $- million as of December 31 , 2018 and 2017 , respectively. Nevada Power incurs intercompany administrative and shared facility costs with NV Energy and Sierra Pacific . These transactions are governed by an intercompany service agreement and are priced at cost. Nevada Power provided services to NV Energy of $1 million , $- million and $1 million for each of the years ending December 31 , 2018 , 2017 and 2016 , respectively. NV Energy provided services to Nevada Power of $7 million , $10 million and $10 million for the years ending December 31 , 2018 , 2017 and 2016 , respectively. Nevada Power provided services to Sierra Pacific of $28 million , $27 million and $24 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Sierra Pacific provided services to Nevada Power of $15 million , $17 million and $14 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. As of December 31 , 2018 and 2017 , Nevada Power 's Consolidated Balance Sheets included amounts due to NV Energy of $26 million and $29 million , respectively. There were no receivables due from NV Energy as of December 31 , 2018 and 2017 . As of December 31 , 2018 and 2017 , Nevada Power 's Consolidated Balance Sheets included receivables due from Sierra Pacific of $5 million . There were no payables due to Sierra Pacific as of December 31 , 2018 and 2017 . Nevada Power is party to a tax-sharing agreement with NV Energy and NV Energy is part of the Berkshire Hathaway consolidated United States federal income tax return. Federal income taxes payable to NV Energy were $4 million and $38 million as of December 31, 2018 and 2017 , respectively. Nevada Power made cash payments of $117 million , $89 million and $- million for federal income taxes for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Certain disbursements for accounts payable and payroll are made by NV Energy on behalf of Nevada Power and reimbursed automatically when settled by the bank. These amounts are recorded as accounts payable at the time of disbursement.

Employee Benefit Plans (Notes)

Employee Benefit Plans (Notes)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Defined Benefit Plans Domestic Operations PacifiCorp, MidAmerican Energy and NV Energy sponsor defined benefit pension plans that cover a majority of all employees of BHE and its domestic energy subsidiaries. These pension plans include noncontributory defined benefit pension plans, supplemental executive retirement plans ("SERP") and a restoration plan for certain executives of NV Energy. PacifiCorp, MidAmerican Energy and NV Energy also provide certain postretirement healthcare and life insurance benefits through various plans to eligible retirees. Net Periodic Benefit Cost For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur. Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 21 $ 24 $ 29 $ 9 $ 9 $ 9 Interest cost 105 116 126 24 29 31 Expected return on plan assets (164 ) (160 ) (160 ) (41 ) (40 ) (41 ) Settlement 21 — — — — — Net amortization 28 25 46 (13 ) (14 ) (12 ) Net periodic benefit cost (credit) $ 11 $ 5 $ 41 $ (21 ) $ (16 ) $ (13 ) Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 2,761 $ 2,525 $ 736 $ 666 Employer contributions 38 64 8 5 Participant contributions — — 8 10 Actual return on plan assets (147 ) 390 (38 ) 106 Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 3,006 $ 2,952 $ 721 $ 734 Service cost 21 24 9 9 Interest cost 105 116 24 29 Participant contributions — — 8 10 Actuarial (gain) loss (160 ) 132 (40 ) (10 ) Amendment 2 — — — Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Benefit obligation, end of year $ 2,718 $ 3,006 $ 672 $ 721 Accumulated benefit obligation, end of year $ 2,709 $ 2,988 The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 Benefit obligation, end of year 2,718 3,006 672 721 Funded status $ (322 ) $ (245 ) $ (8 ) $ 15 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 20 $ 66 $ 5 $ 32 Other current liabilities (13 ) (14 ) — — Other long-term liabilities (329 ) (297 ) (13 ) (17 ) Amounts recognized $ (322 ) $ (245 ) $ (8 ) $ 15 The SERPs and restoration plan have no plan assets; however, the Company has Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERPs and restoration plan. The cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $256 million and $272 million as of December 31, 2018 and 2017 , respectively. These assets are not included in the plan assets in the above table, but are reflected in noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of plan assets, projected benefit obligation and accumulated benefit obligation for (1) pension and other postretirement benefit plans with a projected benefit obligation in excess of the fair value of plan assets and (2) pension plans with an accumulated benefit obligation in excess of the fair value of plan assets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Fair value of plan assets $ 1,752 $ 2,016 $ 417 $ 126 Projected benefit obligation $ 2,091 $ 2,327 $ 429 $ 143 Accumulated benefit obligation $ 2,085 $ 2,316 Unrecognized Amounts The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss $ 747 $ 649 $ 50 $ 14 Prior service credit — (3 ) (22 ) (37 ) Regulatory deferrals (1 ) (4 ) 7 7 Total $ 746 $ 642 $ 35 $ (16 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Pension Balance, December 31, 2016 $ 761 $ (13 ) $ 13 $ 761 Net (gain) loss arising during the year (68 ) (29 ) 3 (94 ) Net amortization (28 ) (1 ) 4 (25 ) Total (96 ) (30 ) 7 (119 ) Balance, December 31, 2017 665 (43 ) 20 642 Net loss (gain) arising during the year 114 43 (6 ) 151 Net prior service cost arising during the year — — 2 2 Settlement (21 ) — — (21 ) Net amortization (28 ) — — (28 ) Total 65 43 (4 ) 104 Balance, December 31, 2018 $ 730 $ — $ 16 $ 746 Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Other Postretirement Balance, December 31, 2016 $ 55 $ (12 ) $ — $ 43 Net gain arising during the year (52 ) (21 ) — (73 ) Net amortization 7 7 — 14 Total (45 ) (14 ) — (59 ) Balance, December 31, 2017 10 (26 ) — (16 ) Net gain arising during the year 23 14 1 38 Net amortization 11 2 — 13 Total 34 16 1 51 Balance, December 31, 2018 $ 44 $ (10 ) $ 1 $ 35 Plan Assumptions Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.06 % 4.21 % 3.57 % 4.01 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rates for cash balance plan 2016 NA NA 2.57 % NA NA NA 2017 NA 2.49 % 2.57 % NA NA NA 2018 3.38 % 3.06 % 2.57 % NA NA NA 2019 3.54 % 3.06 % 3.01 % NA NA NA 2020 3.54 % 2.72 % 3.01 % NA NA NA 2021 3.56 % 2.72 % 3.01 % NA NA NA Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.06 % 4.43 % 3.57 % 4.01 % 4.33 % Expected return on plan assets 6.36 % 6.55 % 6.78 % 6.44 % 6.73 % 7.03 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rate for cash balance plan 3.38 % 2.49 % 2.57 % NA NA NA In establishing its assumption as to the expected return on plan assets, the Company utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. 2018 2017 Assumed healthcare cost trend rates as of December 31: Healthcare cost trend rate assumed for next year 6.80 % 7.10 % Rate that the cost trend rate gradually declines to 5.00 % 5.00 % Year that the rate reaches the rate it is assumed to remain at 2025 2025 Contributions and Benefit Payments Employer contributions to the pension and other postretirement benefit plans are expected to be $13 million and $1 million , respectively, during 2019 . Funding to the established pension trusts is based upon the actuarially determined costs of the plans and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. The Company considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. The Company's funding policy for its other postretirement benefit plans is to generally contribute an amount equal to the net periodic benefit cost. The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Other Pension Postretirement 2019 $ 221 $ 53 2020 224 57 2021 221 55 2022 212 54 2023 212 53 2024-2028 958 243 Plan Assets Investment Policy and Asset Allocations The Company's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by each plan's Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The target allocations (percentage of plan assets) for the Company's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Other Pension Postretirement % % PacifiCorp: Debt securities (1) 30-43 33-37 Equity securities (1) 48-65 62-66 Limited partnership interests 6-12 1-3 MidAmerican Energy: Debt securities (1) 20-50 25-45 Equity securities (1) 60-80 45-80 Real estate funds 2-8 — Other 0-3 0-5 NV Energy: Debt securities (1) 53-77 40 Equity securities (1) 23-47 60 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 8 $ 41 $ 49 Debt securities: United States government obligations 160 — 160 International government obligations — 5 5 Corporate obligations — 373 373 Municipal obligations — 29 29 Agency, asset and mortgage-backed obligations — 123 123 Equity securities: United States companies 492 1 493 International companies 108 — 108 Investment funds (2) 119 — 119 Total assets in the fair value hierarchy $ 887 $ 572 1,459 Investment funds (2) measured at net asset value 792 Limited partnership interests (3) measured at net asset value 104 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 2,396 As of December 31, 2017: Cash equivalents $ 10 $ 76 $ 86 Debt securities: United States government obligations 218 — 218 Corporate obligations — 350 350 Municipal obligations — 16 16 Agency, asset and mortgage-backed obligations — 110 110 Equity securities: United States companies 622 — 622 International companies 136 — 136 Investment funds (2) 83 20 103 Total assets in the fair value hierarchy $ 1,069 $ 572 1,641 Investment funds (2) measured at net asset value 1,019 Limited partnership interests (3) measured at net asset value 63 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 2,761 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 62% and 38% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 73% and 27% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 10 $ 2 $ 12 Debt securities: United States government obligations 13 — 13 Corporate obligations — 42 42 Municipal obligations — 45 45 Agency, asset and mortgage-backed obligations — 30 30 Equity securities: United States companies 158 — 158 International companies 6 — 6 Investment funds 202 1 203 Total assets in the fair value hierarchy $ 389 $ 120 509 Investment funds measured at net asset value 149 Limited partnership interests measured at net asset value 6 Total assets measured at fair value $ 664 As of December 31, 2017: Cash equivalents $ 11 $ 3 $ 14 Debt securities: United States government obligations 20 — 20 Corporate obligations — 36 36 Municipal obligations — 46 46 Agency, asset and mortgage-backed obligations — 29 29 Equity securities: United States companies 185 — 185 International companies 8 — 8 Investment funds (2) 219 1 220 Total assets in the fair value hierarchy $ 443 $ 115 558 Investment funds (2) measured at net asset value 174 Limited partnership interests (3) measured at net asset value 4 Total assets measured at fair value $ 736 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 79% and 21% , respectively, for 2018 and 73% and 27% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund's net asset value is based on the fair value of the underlying assets held by the fund less its liabilities. Foreign Operations Certain wholly-owned subsidiaries of Northern Powergrid participate in the Northern Powergrid group of the United Kingdom industry-wide Electricity Supply Pension Scheme (the "UK Plan"), which provides pension and other related defined benefits, based on final pensionable pay, to the majority of the employees of Northern Powergrid . The UK Plan is closed to employees hired after July 23, 1997. Employees hired after that date are covered by a defined contribution plan sponsored by a wholly-owned subsidiary of Northern Powergrid . Net Periodic Benefit Cost For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur. Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions): 2018 2017 2016 Service cost $ 19 $ 23 $ 20 Interest cost 56 58 72 Expected return on plan assets (101 ) (100 ) (110 ) Settlement 44 31 — Net amortization 45 63 44 Net periodic benefit cost $ 63 $ 75 $ 26 Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): 2018 2017 Plan assets at fair value, beginning of year $ 2,368 $ 2,169 Employer contributions 60 58 Participant contributions 1 1 Actual return on plan assets (44 ) 145 Settlement (205 ) (144 ) Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (120 ) 207 Plan assets at fair value, end of year $ 1,989 $ 2,368 The following table is a reconciliation of the benefit obligation for the years ended December 31 (in millions): 2018 2017 Benefit obligation, beginning of year $ 2,201 $ 2,125 Service cost 19 23 Interest cost 56 58 Participant contributions 1 1 Actuarial gain (87 ) (4 ) Settlement (182 ) (131 ) Amendment 8 — Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (112 ) 197 Benefit obligation, end of year $ 1,833 $ 2,201 Accumulated benefit obligation, end of year $ 1,637 $ 1,933 The funded status of the UK Plan and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): 2018 2017 Plan assets at fair value, end of year $ 1,989 $ 2,368 Benefit obligation, end of year 1,833 2,201 Funded status $ 156 $ 167 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 156 $ 167 Unrecognized Amounts The portion of the funded status of the UK Plan not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): 2018 2017 Net loss $ 472 $ 510 Prior service cost 8 — Total $ 480 $ 510 A reconciliation of the amounts not yet recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss on the Consolidated Balance Sheets, for the years ended December 31 is as follows (in millions): 2018 2017 Balance, beginning of year $ 510 $ 590 Net (gain) loss arising during the year 59 (50 ) Net prior service cost arising during the year 8 — Settlement (22 ) (17 ) Net amortization (45 ) (63 ) Foreign currency exchange rate changes (30 ) 50 Total (30 ) (80 ) Balance, end of year $ 480 $ 510 Plan Assumptions Assumptions used to determine benefit obligations and net periodic benefit cost were as follows: 2018 2017 2016 Benefit obligations as of December 31: Discount rate 2.90 % 2.60 % 2.70 % Rate of compensation increase 3.55 % 3.45 % 3.00 % Rate of future price inflation 3.05 % 2.95 % 3.00 % Net periodic benefit cost for the years ended December 31: Discount rate 2.60 % 2.70 % 3.70 % Expected return on plan assets 4.90 % 5.00 % 5.60 % Rate of compensation increase 3.45 % 3.00 % 2.90 % Rate of future price inflation 2.95 % 3.00 % 2.90 % Contributions and Benefit Payments Employer contributions to the UK Plan are expected to be £43 million during 2019 . The expected benefit payments to participants in the UK Plan for 2019 through 2023 and for the five years thereafter excluding lump sum settlement elections, using the foreign currency exchange rate as of December 31, 2018 , are summarized below (in millions): 2019 $ 70 2020 71 2021 73 2022 75 2023 77 2024-2028 416 Plan Assets Investment Policy and Asset Allocations The investment policy for the UK Plan is to balance risk and return through a diversified portfolio of debt securities, equity securities, real estate and other asset classes. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The UK Plan retains outside investment advisors to manage plan investments within the parameters set by the trustees of the UK Plan in consultation with Northern Powergrid . The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The return on assets assumption is based on a weighted-average of the expected historical performance for the types of assets in which the UK Plan invests. The target allocations (percentage of plan assets) for the UK Plan assets are as follows as of December 31, 2018 : % Debt securities (1) 50-55 Equity securities (1) 35-40 Real estate funds and other 5-15 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds have been allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of the UK Plan assets, by major category (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 3 $ 59 $ — $ 62 Debt securities: United Kingdom government obligations 891 — — 891 Equity securities: Investment funds (2) — 697 — 697 Real estate funds — — 239 239 Total $ 894 $ 756 $ 239 1,889 Investment funds (2) measured at net asset value 100 Total assets measured at fair value $ 1,989 As of December 31, 2017: Cash equivalents $ 4 $ 30 $ — $ 34 Debt securities: United Kingdom government obligations 870 — — 870 Equity securities: Investment funds (2) — 1,027 — 1,027 Real estate funds — — 230 230 Total $ 874 $ 1,057 $ 230 2,161 Investment funds (2) measured at net asset value 207 Total assets measured at fair value $ 2,368 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 36% and 64% , respectively, for 2018 and 21% and 79% , respectively, for 2017 . The fair value of the UK Plan's assets are determined similar to the plan assets of the domestic plans as previously discussed. The following table reconciles the beginning and ending balances of the UK Plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions): Real Estate Funds 2018 2017 2016 Beginning balance $ 230 $ 105 $ 204 Actual return on plan assets still held at period end 23 6 10 Purchases (sales) — 104 (80 ) Foreign currency exchange rate changes (14 ) 15 (29 ) Ending balance $ 239 $ 230 $ 105 Defined Contribution Plans The Company sponsors various defined contribution plans covering substantially all employees. The Company's contributions vary depending on the plan, but matching contributions are based on each participant's level of contribution, and certain participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. The Company's contributions to these plans were $112 million , $103 million and $102 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans PacifiCorp sponsors defined benefit pension and other postretirement benefit plans that cover the majority of its employees, as well as a defined contribution 401(k) employee savings plan ("401(k) Plan"). In addition, PacifiCorp contributes to a joint trustee pension plan and a subsidiary previously contributed to a multiemployer pension plan for benefits offered to certain bargaining units. Defined Benefit Plans PacifiCorp's pension plans include non-contributory defined benefit pension plans, collectively the PacifiCorp Retirement Plan ("Retirement Plan"), and the Supplemental Executive Retirement Plan ("SERP"). The Retirement Plan is closed to all non-union employees hired after January 1, 2008. All non-union Retirement Plan participants hired prior to January 1, 2008 that did not elect to receive equivalent fixed contributions to the 401(k) Plan effective January 1, 2009 earned benefits based on a cash balance formula through December 31, 2016. Effective January 1, 2017, non-union employee participants with a cash balance benefit in the Retirement Plan are no longer eligible to receive pay credits in their cash balance formula. In general for union employees, benefits under the Retirement Plan were frozen at various dates from December 31, 2007 through December 31, 2011 as they are now being provided with enhanced 401(k) Plan benefits. However, certain limited union Retirement Plan participants continue to earn benefits under the Retirement Plan based on the employee's years of service and a final average pay formula. The SERP was closed to new participants as of March 21, 2006 and froze future accruals for active participants as of December 31, 2014. During 2018, the Retirement Plan incurred a settlement charge of $22 million as a result of excess lump sum distributions over the defined threshold for the year ended December 31, 2018. PacifiCorp's other postretirement benefit plan provides healthcare and life insurance benefits to eligible retirees. Net Periodic Benefit Cost For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur. Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ — $ — $ 4 $ 2 $ 2 $ 2 Interest cost 43 49 54 11 14 15 Expected return on plan assets (72 ) (72 ) (75 ) (21 ) (21 ) (21 ) Settlement 22 — — — — — Net amortization 13 14 34 (6 ) (6 ) (5 ) Net periodic benefit cost (credit) $ 6 $ (9 ) $ 17 $ (14 ) $ (11 ) $ (9 ) Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 1,111 $ 999 $ 332 $ 302 Employer contributions 4 54 1 1 Participant contributions — — 5 7 Actual return on plan assets (52 ) 166 (16 ) 49 Settlement (52 ) — — — Benefits paid (69 ) (108 ) (25 ) (27 ) Plan assets at fair value, end of year $ 942 $ 1,111 $ 297 $ 332 The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 1,251 $ 1,276 $ 331 $ 358 Service cost — — 2 2 Interest cost 43 49 11 14 Participant contributions — — 5 7 Actuarial (gain) loss (68 ) 34 (26 ) (23 ) Settlement (52 ) — — Benefits paid (69 ) (108 ) (25 ) (27 ) Benefit obligation, end of year $ 1,105 $ 1,251 $ 298 $ 331 Accumulated benefit obligation, end of year $ 1,105 $ 1,251 The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 942 $ 1,111 $ 297 $ 332 Less - Benefit obligation, end of year 1,105 1,251 298 331 Funded status $ (163 ) $ (140 ) $ (1 ) $ 1 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 3 $ 5 $ — $ 1 Other current liabilities (4 ) (4 ) — — Other long-term liabilities (162 ) (141 ) (1 ) — Amounts recognized $ (163 ) $ (140 ) $ (1 ) $ 1 The SERP has no plan assets; however, PacifiCorp has a Rabbi trust that holds corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in the Rabbi trust, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $52 million and $60 million as of December 31, 2018 and 2017 , respectively. These assets are not included in the plan assets in the above table, but are reflected in cash and cash equivalents, totaling $1 million and $9 million as of December 31, 2018 and 2017 , respectively, and noncurrent other assets, totaling $51 million as of December 31, 2018 and 2017 on the Consolidated Balance Sheets. The projected benefit obligation for the pension and other postretirement plans were in excess of the fair value of their respective plans assets as of December 31, 2018. The accumulated benefit obligation for the pension plans was in excess of the fair value of plan assets as of December 31, 2018. Unrecognized Amounts The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss (gain) $ 461 $ 442 $ (2 ) $ (12 ) Prior service credit — — — (6 ) Regulatory deferrals (1 ) (4 ) 7 7 Total $ 460 $ 438 $ 5 $ (11 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Accumulated Other Regulatory Comprehensive Asset Loss Total Pension Balance, December 31, 2016 $ 491 $ 20 $ 511 Net (gain) loss arising during the year (60 ) 1 (59 ) Net amortization (13 ) (1 ) (14 ) Total (73 ) — (73 ) Balance, December 31, 2017 418 20 438 Net loss (gain) arising during the year 59 (2 ) 57 Net amortization (12 ) (1 ) (13 ) Settlement (22 ) — (22 ) Total 25 (3 ) 22 Balance, December 31, 2018 $ 443 $ 17 $ 460 Regulatory Asset (Liability) Other Postretirement Balance, December 31, 2016 $ 34 Net gain arising during the year (51 ) Net amortization 6 Total (45 ) Balance, December 31, 2017 (11 ) Net loss arising during the year 10 Net amortization 6 Total 16 Balance, December 31, 2018 $ 5 Plan Assumptions Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.05 % 4.25 % 3.60 % 4.05 % Rate of compensation increase N/A N/A N/A N/A N/A N/A Interest crediting rates for cash balance plan (1)(2)(3) 3.40 % 1.61 % 2.06 % N/A N/A N/A Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.05 % 4.40 % 3.60 % 4.05 % 4.35 % Expected return on plan assets 7.00 7.25 7.50 6.86 7.25 7.50 Rate of compensation increase N/A N/A 2.75 N/A N/A N/A (1) 2018 Cash Balance Interest Crediting Rate assumption is 3.40% for 2019 and all future years for nonunion participants and 3.15% for 2019-2020 and 3.25% for 2021+ for union participants. (2) 2017 Cash Balance Interest Crediting Rate assumption was 2.26% for 2018-2019 and 1.60% for 2020+ for nonunion participants and 2.78% for 2018-2019 and 2.60% for 2020+ for union participants. (3) 2016 Cash Balance Interest Crediting Rate assumption was 1.44% for 2017-2018 and 2.05% for 2019+ for nonunion participants and 2.35% for 2017-2018 and 3.05% for 2019+ for union participants. In establishing its assumption as to the expected return on plan assets, PacifiCorp utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. As a result of a plan amendment effective on January 1, 2017, the benefit obligation for the Retirement Plan is no longer affected by future increases in compensation. As a result of a labor settlement reached with UMWA in December 2014, the benefit obligation for the other postretirement plan is no longer affected by healthcare cost trends. Contributions and Benefit Payments Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $0 million , respectively, during 2019 . Funding to PacifiCorp's Retirement Plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 ("ERISA") and the Pension Protection Act of 2006, as amended ("PPA"). PacifiCorp considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the PPA. PacifiCorp's funding of its other postretirement benefit plan is subject to tax deductibility and subordination limits and other considerations. The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Pension Other Postretirement 2019 $ 105 $ 24 2020 102 26 2021 98 23 2022 92 22 2023 88 21 2024-2028 369 95 Plan Assets Investment Policy and Asset Allocations PacifiCorp's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the PacifiCorp Pension Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Pension (1) Other Postretirement (1) % % Debt securities (2) 30 - 43 33 - 37 Equity securities (2) 48 - 65 62 - 66 Limited partnership interests 6 - 12 1 - 3 (1) PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts. (2) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements Level 1 (1) Level 2 (1) Level 3 (1) Total As of December 31, 2018: Cash equivalents $ — $ 11 $ — $ 11 Debt securities: United States government obligations 4 — — 4 International government obligations — 1 — 1 Corporate obligations — 88 — 88 Municipal obligations — 10 — 10 Agency, asset and mortgage-backed obligations — 43 — 43 Equity securities: United States companies 327 — — 327 International companies 15 — — 15 Investment funds (2) 54 — — 54 Total assets in the fair value hierarchy $ 400 $ 153 $ — 553 Investment funds (2) measured at net asset value 285 Limited partnership interests (3) measured at net asset value 104 Investments at fair value $ 942 As of December 31, 2017: Cash equivalents $ — $ 43 $ — $ 43 Debt securities: United States government obligations 45 — — 45 Corporate obligations — 60 — 60 Municipal obligations — 9 — 9 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 416 — — 416 International companies 22 — — 22 Total assets in the fair value hierarchy $ 483 $ 149 $ — 632 Investment funds (2) measured at net asset value 416 Limited partnership interests (3) measured at net asset value 63 Investments at fair value $ 1,111 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 55% and 45% respectively, for 2018 and 60% and 40% , respectively, for 2017 , and are invested in United States and international securities of approximately 68% and 32% , respectively, for 2018 and 57% and 43% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions): Input Levels for Fair Value Measurements Level 1(1) Level 2(1) Level 3(1) Total As of December 31, 2018: Cash and cash equivalents $ 4 $ 1 $ — $ 5 Debt securities: United States government obligations 3 — — 3 Corporate obligations — 23 — 23 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 17 — 17 Equity securities: United States companies 83 — — 83 International companies 4 — — 4 Investment funds (2) 38 — — 38 Total assets in the fair value hierarchy 132 43 — 175 Investment funds (2) measured at net asset value 116 Limited partnership interests (3) measured at net asset value 6 Investments at fair value $ 297 As of December 31, 2017: Cash and cash equivalents $ 4 $ 3 $ — $ 7 Debt securities: United States government obligations 11 — — 11 Corporate obligations — 16 — 16 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 16 — 16 Equity securities: United States companies 98 — — 98 International companies 6 — — 6 Investment funds (2) 32 — — 32 Total assets in the fair value hierarchy 151 37 — 188 Investment funds (2) measured at net asset value 140 Limited partnership interests (3) measured at net asset value 4 Investments at fair value $ 332 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 63% and 37% , respectively, for 2017 , and are invested in United States and international securities of approximately 90% and 10% , respectively, for 2018 and 77% and 23% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund's net asset value is based on the fair value of the underlying assets held by the fund less its liabilities. Multiemployer and Joint Trustee Pension Plans PacifiCorp contributes to the PacifiCorp/IBEW Local 57 Retirement Trust Fund ("Local 57 Trust Fund") (plan number 001) and its subsidiary, Energy West Mining Company, previously contributed to the UMWA 1974 Pension Plan (plan number 002). Contributions to these pension plans are based on the terms of collective bargaining agreements. As a result of the Utah Mine Disposition and United Mine Workers of America ("UMWA") labor settlement, PacifiCorp's subsidiary, Energy West Mining Company, triggered involuntary withdrawal from the UMWA 1974 Pension Plan in June 2015 when the UMWA employees ceased performing work for the subsidiary. PacifiCorp recorded its estimate of the withdrawal obligation in December 2014 when withdrawal was considered probable and deferred the portion of the obligation considered probable of recovery to a regulatory asset. PacifiCorp has subsequently revised its estimate due to changes in facts and circumstances for a withdrawal occurring by July 2015. As communicated in a letter received in August 2016, the plan trustees have determined a withdrawal liability of $115 million . Energy West Mining Company began making installment payments in November 2016 and has the option to elect a lump sum payment to settle the withdrawal obligation. The ultimate amount paid by Energy West Mining Company to settle the obligation is dependent on a variety of factors, including the results of ongoing negotiations with the plan trustees. The Local 57 Trust Fund is a joint trustee plan such that the board of trustees is represented by an equal number of trustees from PacifiCorp and the union. The Local 57 Trust Fund was established pursuant to the provisions of the Taft-Hartley Act and although formed with the ability for other employers to participate in the plan, there are no other employers that participate in this plan. The risk of participating in multiemployer pension plans generally differs from single-employer plans in that assets are pooled such that contributions by one employer may be used to provide benefits to employees of other participating employers and plan assets cannot revert back to employers. If an employer ceases participation in the plan, the employer may be obligated to pay a withdrawal liability based on the participants' unfunded, vested benefits in the plan. This occurred as a result of Energy West Mining Company's withdrawal from the UMWA 1974 Pension Plan. If participating employers withdraw from a multiemployer plan, the unfunded obligations of the plan may be borne by the remaining participating employers, including any employers that withdrew during the three years prior to a mass withdrawal. The following table presents PacifiCorp's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions): PPA zone status or plan funded status percentage for plan years beginning July 1, Contributions (1) Plan name Employer Identification Number 2018 2017 2016 Funding improvement plan Surcharge imposed under PPA (1) 2018 2017 2016 Year contributions to plan exceeded more than 5% of total contributions (2) Local 57 Trust Fund 87-0640888 At least 80% At least 80% At least 80% None None $ 7 $ 7 $ 8 2016, 2015, 2014 (1) PacifiCorp's minimum contributions to the plan are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements, subject to ERISA minimum funding requirements. (2) For the Local 57 Trust Fund, information is for plan years beginning July 1, 2016, 2015 and 2014. Information for the plan year beginning July 1, 2017 is not yet available. The current collective bargaining agreements governing the Local 57 Trust Fund expire in 2023. Defined Contribution Plan PacifiCorp's 401(k) plan covers substantially all employees. PacifiCorp's matching contributions are based on each participant's level of contribution and, as of January 1, 2018 , all participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. PacifiCorp's contributions to the 401(k) plan were $39 million , $39 million and $34 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Defined Benefit Plan MidAmerican Energy sponsors a noncontributory defined benefit pension plan covering a majority of all employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. Benefit obligations under the plan are based on a cash balance arrangement for salaried employees and most union employees and final average pay formulas for other union employees. MidAmerican Energy also maintains noncontributory, nonqualified defined benefit supplemental executive retirement plans ("SERP") for certain active and retired participants. In 2018, the defined benefit pension plan recorded a settlement gain of $1 million for previously unrecognized gains as a result of excess lump sum distributions over the defined threshold for the year ended December 31, 2018. MidAmerican Energy also sponsors certain postretirement healthcare and life insurance benefits covering substantially all retired employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. Under the plans, a majority of all employees of the participating companies may become eligible for these benefits if they reach retirement age. New employees are not eligible for benefits under the plans. MidAmerican Energy has been allowed to recover accrued pension and other postretirement benefit costs in its electric and gas service rates. Net Periodic Benefit Cost For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns on equity investments over a five-year period beginning after the first year in which they occur. MidAmerican Energy bills to and is reimbursed currently for affiliates' share of the net periodic benefit costs from all plans in which such affiliates participate. In 2018 , 2017 and 2016 , MidAmerican Energy's share of the pension net periodic benefit (credit) cost was $(9) million , $(6) million and $(2) million , respectively. MidAmerican Energy's share of the other postretirement net periodic benefit (credit) cost in 2018 , 2017 and 2016 totaled $(2) million , $(1) million and $(1) million , respectively. Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 9 $ 9 $ 10 $ 5 $ 5 $ 5 Interest cost 28 31 34 8 9 10 Expected return on plan assets (44 ) (44 ) (44 ) (13 ) (14 ) (13 ) Settlement (1 ) — — — — — Net amortization 2 2 2 (4 ) (4 ) (4 ) Net periodic benefit (credit) cost $ (6 ) $ (2 ) $ 2 $ (4 ) $ (4 ) $ (2 ) Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 745 $ 684 $ 277 $ 252 Employer contributions 7 7 1 1 Participant contributions — — 1 1 Actual return on plan assets (39 ) 114 (17 ) 36 Settlement (37 ) — — — Benefits paid (32 ) (60 ) (15 ) (13 ) Plan assets at fair value, end of year $ 644 $ 745 $ 247 $ 277 The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 799 $ 773 $ 246 $ 233 Service cost 9 9 5 5 Interest cost 28 31 8 9 Participant contributions — — 1 1 Actuarial (gain) loss (33 ) 46 (3 ) 11 Plan amendments 2 — — — Settlement (37 ) — — — Benefits paid (32 ) (60 ) (15 ) (13 ) Benefit obligation, end of year $ 736 $ 799 $ 242 $ 246 Accumulated benefit obligation, end of year $ 733 $ 790 The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 644 $ 745 $ 247 $ 277 Less - Benefit obligation, end of year 736 799 242 246 Funded status $ (92 ) $ (54 ) $ 5 $ 31 Amounts recognized on the Balance Sheets: Other assets $ 17 $ 66 $ 5 $ 31 Other current liabilities (7 ) (8 ) — — Other liabilities (102 ) (112 ) — — Amounts recognized $ (92 ) $ (54 ) $ 5 $ 31 The SERP has no plan assets; however, MidAmerican Energy and BHE have Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in MidAmerican Energy's Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $116 million and $118 million as of December 31, 2018 and 2017 . These assets are not included in the plan assets in the above table, but are reflected in investments and restricted investments on the Balance Sheets. The accumulated benefit obligation and projected benefit obligation for the SERP was $109 million and $109 million for 2018 and $118 million and $120 million for 2017, respectively. Unrecognized Amounts The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss (gain) $ 40 $ (11 ) $ 48 $ 23 Prior service cost (credit) 1 1 (20 ) (25 ) Total $ 41 $ (10 ) $ 28 $ (2 ) MidAmerican Energy sponsors pension and other postretirement benefit plans on behalf of certain of its affiliates in addition to itself, and therefore, the portion of the funded status of the respective plans that has not yet been recognized in net periodic benefit cost is attributable to multiple entities. Additionally, substantially all of MidAmerican Energy's portion of such amounts is either refundable to or recoverable from its customers and is reflected as regulatory liabilities and regulatory assets. A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Regulatory Asset Regulatory Liability Receivables (Payables) with Affiliates Total Pension Balance, December 31, 2016 $ 22 $ (12 ) $ 6 $ 16 Net loss (gain) arising during the year 4 (29 ) 1 (24 ) Net amortization (2 ) — — (2 ) Total 2 (29 ) 1 (26 ) Balance, December 31, 2017 24 (41 ) 7 (10 ) Net loss arising during the year 2 41 9 52 Net amortization (2 ) — — (2 ) Settlement 1 — — 1 Total 1 41 9 51 Balance, December 31, 2018 $ 25 $ — $ 16 $ 41 Regulatory Asset Receivables (Payables) with Affiliates Total Other Postretirement Balance, December 31, 2016 $ 18 $ (13 ) $ 5 Net gain arising during the year (7 ) (4 ) (11 ) Net amortization 3 1 4 Total (4 ) (3 ) (7 ) Balance, December 31, 2017 14 (16 ) (2 ) Net loss arising during the year 20 6 26 Net amortization 3 1 4 Total 23 7 30 Balance, December 31, 2018 $ 37 $ (9 ) $ 28 Actuarial losses for 2018 impacting the December 31, 2018 funded status for the pension and other postretirement plans are due to lower than assumed actual return on plan assets, offset by an increase in the discount rate assumptions from that assumed at December 31, 2017. Plan Assumptions Assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.10 % 4.15 % 3.50 % 3.90 % Rate of compensation increase 2.75 % 2.75 % 2.75 % N/A N/A N/A Interest crediting rates for cash balance plan 2016 N/A N/A 1.18 % N/A N/A N/A 2017 N/A 1.44 % 1.44 % N/A N/A N/A 2018 2.26 % 2.26 % 1.44 % N/A N/A N/A 2019 3.40 % 2.26 % 2.10 % N/A N/A N/A 2020 3.40 % 1.60 % 2.10 % N/A N/A N/A 2021 and beyond 3.40 % 1.60 % 2.10 % N/A N/A N/A Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.10 % 4.50 % 3.50 % 3.90 % 4.25 % Expected return on plan assets (1) 6.50 % 6.75 % 7.00 % 6.25 % 6.50 % 6.75 % Rate of compensation increase 2.75 % 2.75 % 2.75 % N/A N/A N/A Interest crediting rates for cash balance plan 2.26 % 1.44 % 1.18 % N/A N/A N/A (1) Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 4.13% for 2018 , and 4.81% for 2017 , and 5.00% for 2016 . In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. 2018 2017 Assumed healthcare cost trend rates as of December 31: Healthcare cost trend rate assumed for next year 6.80 % 7.10 % Rate that the cost trend rate gradually declines to 5.00 % 5.00 % Year that the rate reaches the rate it is assumed to remain at 2025 2025 Contributions and Benefit Payments Employer contributions to the pension and other postretirement benefit plans are expected to be $7 million and $1 million , respectively, during 2019 . Funding to MidAmerican Energy's pension benefit plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. MidAmerican Energy considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. MidAmerican Energy's funding policy for its other postretirement benefit plan is to generally contribute amounts consistent with its rate regulatory arrangements. Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Pension Other Postretirement 2019 $ 61 $ 19 2020 62 21 2021 61 22 2022 60 22 2023 58 22 2024-2028 262 102 Plan Assets Investment Policy and Asset Allocations MidAmerican Energy's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the MidAmerican Energy Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Pension Other Postretirement % % Debt securities (1) 20-50 25-45 Equity securities (1) 60-80 45-80 Real estate funds 2-8 — Other 0-3 0-5 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ — $ 20 $ — $ 20 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 63 — 63 Municipal obligations — 6 — 6 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 111 — — 111 International companies 35 — — 35 Investment funds (2) 65 — — 65 Total assets in the hierarchy $ 217 $ 126 $ — — Investment funds (2) measured at net asset value 260 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 644 As of December 31, 2017: Cash equivalents $ — $ 17 $ — $ 17 Debt securities: United States government obligations 21 — — 21 Corporate obligations — 59 — 59 Municipal obligations — 7 — 7 Agency, asset and mortgage-backed obligations — 33 — 33 Equity securities: United States companies 137 — — 137 International companies 44 — — 44 Investment funds (2) 74 — — 74 Total assets in the hierarchy $ 276 $ 116 $ — 392 Investment funds (2) measured at net asset value 315 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 745 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 69% and 31% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 74% and 26% , respectively, for 2018 and 72% and 28% , respectively, for 2017 . The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 5 $ — $ — $ 5 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 12 — 12 Municipal obligations — 43 — 43 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 73 — — 73 Investment funds (2) 96 — — 96 Total assets measured at fair value $ 180 $ 67 $ — $ 247 As of December 31, 2017: Cash equivalents $ 6 $ — $ — $ 6 Debt securities: United States government obligations 5 — — 5 Corporate obligations — 14 — 14 Municipal obligations — 44 — 44 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 84 — — 84 Investment funds (2) 112 — — 112 Total assets measured at fair value $ 207 $ 70 $ — $ 277 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22% , respectively, for 2018 and 81% and 19% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 41% and 59% , respectively, for 2018 and 42% and 58% , respectively, for 2017 . For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund's net asset value is based on the fair value of the underlying assets held by the fund less its liabilities. Defined Contribution Plan MidAmerican Energy sponsors a defined contribution plan ("401(k) plan") covering substantially all employees. MidAmerican Energy's matching contributions are based on each participant's level of contribution, and certain participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. Certain participants now receive enhanced benefits in the 401(k) plan and no longer accrue benefits in the noncontributory defined benefit pension plans. MidAmerican Energy's contributions to the plan were $22 million , $20 million , and $20 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Refer to Note 10 of MidAmerican Energy's Notes to Financial Statements for additional information regarding MidAmerican Funding's pension, supplemental retirement and postretirement benefit plans. Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions): 2018 2017 2016 Pension costs $ 3 $ 4 $ 4 Other postretirement costs (2 ) (3 ) (1 )

Retirement Plan and Postretirem

Retirement Plan and Postretirement Benefits Retirement Plan and Postretirement Benefits (Notes)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Defined Benefit Plans Domestic Operations PacifiCorp, MidAmerican Energy and NV Energy sponsor defined benefit pension plans that cover a majority of all employees of BHE and its domestic energy subsidiaries. These pension plans include noncontributory defined benefit pension plans, supplemental executive retirement plans ("SERP") and a restoration plan for certain executives of NV Energy. PacifiCorp, MidAmerican Energy and NV Energy also provide certain postretirement healthcare and life insurance benefits through various plans to eligible retirees. Net Periodic Benefit Cost For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur. Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 21 $ 24 $ 29 $ 9 $ 9 $ 9 Interest cost 105 116 126 24 29 31 Expected return on plan assets (164 ) (160 ) (160 ) (41 ) (40 ) (41 ) Settlement 21 — — — — — Net amortization 28 25 46 (13 ) (14 ) (12 ) Net periodic benefit cost (credit) $ 11 $ 5 $ 41 $ (21 ) $ (16 ) $ (13 ) Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 2,761 $ 2,525 $ 736 $ 666 Employer contributions 38 64 8 5 Participant contributions — — 8 10 Actual return on plan assets (147 ) 390 (38 ) 106 Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 3,006 $ 2,952 $ 721 $ 734 Service cost 21 24 9 9 Interest cost 105 116 24 29 Participant contributions — — 8 10 Actuarial (gain) loss (160 ) 132 (40 ) (10 ) Amendment 2 — — — Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Benefit obligation, end of year $ 2,718 $ 3,006 $ 672 $ 721 Accumulated benefit obligation, end of year $ 2,709 $ 2,988 The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 Benefit obligation, end of year 2,718 3,006 672 721 Funded status $ (322 ) $ (245 ) $ (8 ) $ 15 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 20 $ 66 $ 5 $ 32 Other current liabilities (13 ) (14 ) — — Other long-term liabilities (329 ) (297 ) (13 ) (17 ) Amounts recognized $ (322 ) $ (245 ) $ (8 ) $ 15 The SERPs and restoration plan have no plan assets; however, the Company has Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERPs and restoration plan. The cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $256 million and $272 million as of December 31, 2018 and 2017 , respectively. These assets are not included in the plan assets in the above table, but are reflected in noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of plan assets, projected benefit obligation and accumulated benefit obligation for (1) pension and other postretirement benefit plans with a projected benefit obligation in excess of the fair value of plan assets and (2) pension plans with an accumulated benefit obligation in excess of the fair value of plan assets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Fair value of plan assets $ 1,752 $ 2,016 $ 417 $ 126 Projected benefit obligation $ 2,091 $ 2,327 $ 429 $ 143 Accumulated benefit obligation $ 2,085 $ 2,316 Unrecognized Amounts The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss $ 747 $ 649 $ 50 $ 14 Prior service credit — (3 ) (22 ) (37 ) Regulatory deferrals (1 ) (4 ) 7 7 Total $ 746 $ 642 $ 35 $ (16 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Pension Balance, December 31, 2016 $ 761 $ (13 ) $ 13 $ 761 Net (gain) loss arising during the year (68 ) (29 ) 3 (94 ) Net amortization (28 ) (1 ) 4 (25 ) Total (96 ) (30 ) 7 (119 ) Balance, December 31, 2017 665 (43 ) 20 642 Net loss (gain) arising during the year 114 43 (6 ) 151 Net prior service cost arising during the year — — 2 2 Settlement (21 ) — — (21 ) Net amortization (28 ) — — (28 ) Total 65 43 (4 ) 104 Balance, December 31, 2018 $ 730 $ — $ 16 $ 746 Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Other Postretirement Balance, December 31, 2016 $ 55 $ (12 ) $ — $ 43 Net gain arising during the year (52 ) (21 ) — (73 ) Net amortization 7 7 — 14 Total (45 ) (14 ) — (59 ) Balance, December 31, 2017 10 (26 ) — (16 ) Net gain arising during the year 23 14 1 38 Net amortization 11 2 — 13 Total 34 16 1 51 Balance, December 31, 2018 $ 44 $ (10 ) $ 1 $ 35 Plan Assumptions Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.06 % 4.21 % 3.57 % 4.01 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rates for cash balance plan 2016 NA NA 2.57 % NA NA NA 2017 NA 2.49 % 2.57 % NA NA NA 2018 3.38 % 3.06 % 2.57 % NA NA NA 2019 3.54 % 3.06 % 3.01 % NA NA NA 2020 3.54 % 2.72 % 3.01 % NA NA NA 2021 3.56 % 2.72 % 3.01 % NA NA NA Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.06 % 4.43 % 3.57 % 4.01 % 4.33 % Expected return on plan assets 6.36 % 6.55 % 6.78 % 6.44 % 6.73 % 7.03 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rate for cash balance plan 3.38 % 2.49 % 2.57 % NA NA NA In establishing its assumption as to the expected return on plan assets, the Company utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. 2018 2017 Assumed healthcare cost trend rates as of December 31: Healthcare cost trend rate assumed for next year 6.80 % 7.10 % Rate that the cost trend rate gradually declines to 5.00 % 5.00 % Year that the rate reaches the rate it is assumed to remain at 2025 2025 Contributions and Benefit Payments Employer contributions to the pension and other postretirement benefit plans are expected to be $13 million and $1 million , respectively, during 2019 . Funding to the established pension trusts is based upon the actuarially determined costs of the plans and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. The Company considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. The Company's funding policy for its other postretirement benefit plans is to generally contribute an amount equal to the net periodic benefit cost. The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Other Pension Postretirement 2019 $ 221 $ 53 2020 224 57 2021 221 55 2022 212 54 2023 212 53 2024-2028 958 243 Plan Assets Investment Policy and Asset Allocations The Company's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by each plan's Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The target allocations (percentage of plan assets) for the Company's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Other Pension Postretirement % % PacifiCorp: Debt securities (1) 30-43 33-37 Equity securities (1) 48-65 62-66 Limited partnership interests 6-12 1-3 MidAmerican Energy: Debt securities (1) 20-50 25-45 Equity securities (1) 60-80 45-80 Real estate funds 2-8 — Other 0-3 0-5 NV Energy: Debt securities (1) 53-77 40 Equity securities (1) 23-47 60 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 8 $ 41 $ 49 Debt securities: United States government obligations 160 — 160 International government obligations — 5 5 Corporate obligations — 373 373 Municipal obligations — 29 29 Agency, asset and mortgage-backed obligations — 123 123 Equity securities: United States companies 492 1 493 International companies 108 — 108 Investment funds (2) 119 — 119 Total assets in the fair value hierarchy $ 887 $ 572 1,459 Investment funds (2) measured at net asset value 792 Limited partnership interests (3) measured at net asset value 104 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 2,396 As of December 31, 2017: Cash equivalents $ 10 $ 76 $ 86 Debt securities: United States government obligations 218 — 218 Corporate obligations — 350 350 Municipal obligations — 16 16 Agency, asset and mortgage-backed obligations — 110 110 Equity securities: United States companies 622 — 622 International companies 136 — 136 Investment funds (2) 83 20 103 Total assets in the fair value hierarchy $ 1,069 $ 572 1,641 Investment funds (2) measured at net asset value 1,019 Limited partnership interests (3) measured at net asset value 63 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 2,761 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 62% and 38% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 73% and 27% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 10 $ 2 $ 12 Debt securities: United States government obligations 13 — 13 Corporate obligations — 42 42 Municipal obligations — 45 45 Agency, asset and mortgage-backed obligations — 30 30 Equity securities: United States companies 158 — 158 International companies 6 — 6 Investment funds 202 1 203 Total assets in the fair value hierarchy $ 389 $ 120 509 Investment funds measured at net asset value 149 Limited partnership interests measured at net asset value 6 Total assets measured at fair value $ 664 As of December 31, 2017: Cash equivalents $ 11 $ 3 $ 14 Debt securities: United States government obligations 20 — 20 Corporate obligations — 36 36 Municipal obligations — 46 46 Agency, asset and mortgage-backed obligations — 29 29 Equity securities: United States companies 185 — 185 International companies 8 — 8 Investment funds (2) 219 1 220 Total assets in the fair value hierarchy $ 443 $ 115 558 Investment funds (2) measured at net asset value 174 Limited partnership interests (3) measured at net asset value 4 Total assets measured at fair value $ 736 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 79% and 21% , respectively, for 2018 and 73% and 27% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund's net asset value is based on the fair value of the underlying assets held by the fund less its liabilities. Foreign Operations Certain wholly-owned subsidiaries of Northern Powergrid participate in the Northern Powergrid group of the United Kingdom industry-wide Electricity Supply Pension Scheme (the "UK Plan"), which provides pension and other related defined benefits, based on final pensionable pay, to the majority of the employees of Northern Powergrid . The UK Plan is closed to employees hired after July 23, 1997. Employees hired after that date are covered by a defined contribution plan sponsored by a wholly-owned subsidiary of Northern Powergrid . Net Periodic Benefit Cost For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur. Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions): 2018 2017 2016 Service cost $ 19 $ 23 $ 20 Interest cost 56 58 72 Expected return on plan assets (101 ) (100 ) (110 ) Settlement 44 31 — Net amortization 45 63 44 Net periodic benefit cost $ 63 $ 75 $ 26 Funded Status The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): 2018 2017 Plan assets at fair value, beginning of year $ 2,368 $ 2,169 Employer contributions 60 58 Participant contributions 1 1 Actual return on plan assets (44 ) 145 Settlement (205 ) (144 ) Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (120 ) 207 Plan assets at fair value, end of year $ 1,989 $ 2,368 The following table is a reconciliation of the benefit obligation for the years ended December 31 (in millions): 2018 2017 Benefit obligation, beginning of year $ 2,201 $ 2,125 Service cost 19 23 Interest cost 56 58 Participant contributions 1 1 Actuarial gain (87 ) (4 ) Settlement (182 ) (131 ) Amendment 8 — Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (112 ) 197 Benefit obligation, end of year $ 1,833 $ 2,201 Accumulated benefit obligation, end of year $ 1,637 $ 1,933 The funded status of the UK Plan and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): 2018 2017 Plan assets at fair value, end of year $ 1,989 $ 2,368 Benefit obligation, end of year 1,833 2,201 Funded status $ 156 $ 167 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 156 $ 167 Unrecognized Amounts The portion of the funded status of the UK Plan not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): 2018 2017 Net loss $ 472 $ 510 Prior service cost 8 — Total $ 480 $ 510 A reconciliation of the amounts not yet recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss on the Consolidated Balance Sheets, for the years ended December 31 is as follows (in millions): 2018 2017 Balance, beginning of year $ 510 $ 590 Net (gain) loss arising during the year 59 (50 ) Net prior service cost arising during the year 8 — Settlement (22 ) (17 ) Net amortization (45 ) (63 ) Foreign currency exchange rate changes (30 ) 50 Total (30 ) (80 ) Balance, end of year $ 480 $ 510 Plan Assumptions Assumptions used to determine benefit obligations and net periodic benefit cost were as follows: 2018 2017 2016 Benefit obligations as of December 31: Discount rate 2.90 % 2.60 % 2.70 % Rate of compensation increase 3.55 % 3.45 % 3.00 % Rate of future price inflation 3.05 % 2.95 % 3.00 % Net periodic benefit cost for the years ended December 31: Discount rate 2.60 % 2.70 % 3.70 % Expected return on plan assets 4.90 % 5.00 % 5.60 % Rate of compensation increase 3.45 % 3.00 % 2.90 % Rate of future price inflation 2.95 % 3.00 % 2.90 % Contributions and Benefit Payments Employer contributions to the UK Plan are expected to be £43 million during 2019 . The expected benefit payments to participants in the UK Plan for 2019 through 2023 and for the five years thereafter excluding lump sum settlement elections, using the foreign currency exchange rate as of December 31, 2018 , are summarized below (in millions): 2019 $ 70 2020 71 2021 73 2022 75 2023 77 2024-2028 416 Plan Assets Investment Policy and Asset Allocations The investment policy for the UK Plan is to balance risk and return through a diversified portfolio of debt securities, equity securities, real estate and other asset classes. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The UK Plan retains outside investment advisors to manage plan investments within the parameters set by the trustees of the UK Plan in consultation with Northern Powergrid . The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The return on assets assumption is based on a weighted-average of the expected historical performance for the types of assets in which the UK Plan invests. The target allocations (percentage of plan assets) for the UK Plan assets are as follows as of December 31, 2018 : % Debt securities (1) 50-55 Equity securities (1) 35-40 Real estate funds and other 5-15 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds have been allocated based on the underlying investments in debt and equity securities. Fair Value Measurements The following table presents the fair value of the UK Plan assets, by major category (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 3 $ 59 $ — $ 62 Debt securities: United Kingdom government obligations 891 — — 891 Equity securities: Investment funds (2) — 697 — 697 Real estate funds — — 239 239 Total $ 894 $ 756 $ 239 1,889 Investment funds (2) measured at net asset value 100 Total assets measured at fair value $ 1,989 As of December 31, 2017: Cash equivalents $ 4 $ 30 $ — $ 34 Debt securities: United Kingdom government obligations 870 — — 870 Equity securities: Investment funds (2) — 1,027 — 1,027 Real estate funds — — 230 230 Total $ 874 $ 1,057 $ 230 2,161 Investment funds (2) measured at net asset value 207 Total assets measured at fair value $ 2,368 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 36% and 64% , respectively, for 2018 and 21% and 79% , respectively, for 2017 . The fair value of the UK Plan's assets are determined similar to the plan assets of the domestic plans as previously discussed. The following table reconciles the beginning and ending balances of the UK Plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions): Real Estate Funds 2018 2017 2016 Beginning balance $ 230 $ 105 $ 204 Actual return on plan assets still held at period end 23 6 10 Purchases (sales) — 104 (80 ) Foreign currency exchange rate changes (14 ) 15 (29 ) Ending balance $ 239 $ 230 $ 105 Defined Contribution Plans The Company sponsors various defined contribution plans covering substantially all employees. The Company's contributions vary depending on the plan, but matching contributions are based on each participant's level of contribution, and certain participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. The Company's contributions to these plans were $112 million , $103 million and $102 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.
Nevada Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Nevada Power is a participant in benefit plans sponsored by NV Energy . The NV Energy Retirement Plan includes a qualified pension plan ("Qualified Pension Plan") and a supplemental executive retirement plan and a restoration plan (collectively, "Non‑Qualified Pension Plans") that provide pension benefits for eligible employees. The NV Energy Comprehensive Welfare Benefit and Cafeteria Plan provides certain postretirement health care and life insurance benefits for eligible retirees ("Other Postretirement Plans") on behalf of Nevada Power . Nevada Power contributed $19 million , $1 million and $36 million to the Qualified Pension Plan for the year ended December 31 , 2018 , 2017 and 2016 , respectively. Nevada Power contributed $ 1 million , $1 million and $- million to the Non-Qualified Pension Plans for the year ended December 31 , 2018 , 2017 and 2016 , respectively. Nevada Power contributed $- million to the Other Postretirement Plans for the year ended December 31 , 2018 and did not make any contributions for the years ended December 31 , 2017 and 2016 . Amounts attributable to Nevada Power were allocated from NV Energy based upon the current, or in the case of retirees, previous, employment location. Offsetting regulatory assets and liabilities have been recorded related to the amounts not yet recognized as a component of net periodic benefit costs that will be included in regulated rates. Net periodic benefit costs not included in regulated rates are included in accumulated other comprehensive loss, net. Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following as of December 31 (in millions): 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (26 ) $ (23 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (10 ) Other Postretirement Plans - Other long-term liabilities (1 ) 1
Sierra Pacific Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee Benefit Plans [Text Block]	Employee Benefit Plans Sierra Pacific is a participant in benefit plans sponsored by NV Energy . The NV Energy Retirement Plan includes a qualified pension plan ("Qualified Pension Plan") and a supplemental executive retirement plan and a restoration plan (collectively, "Non‑Qualified Pension Plans") that provide pension benefits for eligible employees. The NV Energy Comprehensive Welfare Benefit and Cafeteria Plan provides certain postretirement health care and life insurance benefits for eligible retirees ("Other Postretirement Plans") on behalf of Sierra Pacific . Sierra Pacific contributed $6 million , $1 million and $27 million to the Qualified Pension Plan for the year ended December 31 , 2018 , 2017 and 2016 , respectively. For the Other Postretirement Plans, Sierra Pacific contributed $6 million , $ 4 million and $1 million for the year ended December 31 , 2018 , 2017 and 2016 , respectively. Sierra Pacific contributed $ 1 million , $1 million and $- million to the Non-Qualified Pension Plans for the year ended December 31 , 2018 , 2017 and 2016 , respectively. Amounts attributable to Sierra Pacific were allocated from NV Energy based upon the current, or in the case of retirees, previous, employment location. Offsetting regulatory assets and liabilities have been recorded related to the amounts not yet recognized as a component of net periodic benefit costs that will be included in regulated rates. Net periodic benefit costs not included in regulated rates are included in accumulated other comprehensive loss, net. Amounts payable to NV Energy are included on the Balance Sheets and consist of the following as of December 31 (in millions): 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (19 ) $ (2 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (7 ) (8 ) Other Postretirement Plans - Other long-term liabilities (13 ) (20 )

Asset Retirement Obligations (N

Asset Retirement Obligations (Notes)	12 Months Ended
	Dec. 31, 2018
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations The Company estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. The Company does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain generation, transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Consolidated Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. These accruals totaled $2.4 billion and $2.3 billion as of December 31, 2018 and 2017 , respectively. The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Fossil fuel facilities $ 371 $ 380 Quad Cities Station 345 342 Wind generating facilities 174 138 Offshore pipeline facilities 33 32 Solar generating facilities 20 19 Other 42 43 Total asset retirement obligations $ 985 $ 954 Quad Cities Station nuclear decommissioning trust funds $ 504 $ 515 The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 954 $ 954 Change in estimated costs 10 (18 ) Additions 28 21 Retirements (45 ) (45 ) Accretion 38 42 Ending balance $ 985 $ 954 Reflected as: Other current liabilities $ 43 $ 60 Other long-term liabilities 942 894 Total ARO liability $ 985 $ 954 The Nuclear Regulatory Commission regulates the decommissioning of nuclear power plants, which includes the planning and funding for the decommissioning. In accordance with these regulations, MidAmerican Energy submits a biennial report to the Nuclear Regulatory Commission providing reasonable assurance that funds will be available to pay for its share of the Quad Cities Station decommissioning. Certain of the Company's decommissioning and reclamation obligations relate to jointly owned facilities and mine sites, and as such, each subsidiary is committed to pay a proportionate share of the decommissioning or reclamation costs. In the event of a default by any of the other joint participants, the respective subsidiary may be obligated to absorb, directly or by paying additional sums to the entity, a proportionate share of the defaulting party's liability. The Company's estimated share of the decommissioning and reclamation obligations are primarily recorded as ARO liabilities. The changes in estimated costs relate primarily to the Quad Cities Station due to a change in the inflation rate and, for 2017, a new decommissioning study conducted by the operator of Quad Cities Station that changed the estimated amount and timing of cash flows. In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy discontinued sending CCR to surface impoundments effective April 2018 and will remove all CCR material located below the water table in such facilities, the latter of which is a more extensive closure activity than previously assumed. The incremental cost and timing of such actions is not currently reasonably determinable, but an evaluation of such estimates is expected to be completed in the first quarter of 2019, with any necessary adjustments to the related asset retirement obligations recognized at that time.
PacifiCorp [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	PacifiCorp estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. PacifiCorp does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Consolidated Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. Cost of removal regulatory liabilities totaled $994 million and $955 million as of December 31, 2018 and 2017 , respectively. The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 215 $ 215 Change in estimated costs 9 (8 ) Additions — 6 Retirements (5 ) (6 ) Accretion 8 8 Ending balance $ 227 $ 215 Reflected as: Other current liabilities $ 21 $ 25 Other long-term liabilities 206 190 $ 227 $ 215 Certain of PacifiCorp's decommissioning and reclamation obligations relate to jointly owned facilities and mine sites. PacifiCorp is committed to pay a proportionate share of the decommissioning or reclamation costs. In the event of a default by any of the other joint participants, PacifiCorp may be obligated to absorb, directly or by paying additional sums to the entity, a proportionate share of the defaulting party's liability. PacifiCorp's estimated share of the decommissioning and reclamation obligations are primarily recorded as ARO liabilities.
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations MidAmerican Energy estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. MidAmerican Energy does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain generation, transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. These accruals totaled $708 million and $688 million as of December 31, 2018 and 2017 , respectively. The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Quad Cities Station $ 345 $ 342 Fossil-fueled generating facilities 93 113 Wind-powered generating facilities 123 103 Other 1 1 Total asset retirement obligations $ 562 $ 559 Quad Cities Station nuclear decommissioning trust funds (1) $ 504 $ 515 (1) Refer to Note 6 for a discussion of the Quad Cities Station nuclear decommissioning trust funds. The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 559 $ 567 Change in estimated costs (10 ) (14 ) Additions 17 8 Retirements (28 ) (26 ) Accretion 24 24 Ending balance $ 562 $ 559 Reflected as: Other current liabilities $ 10 $ 31 Asset retirement obligations 552 528 $ 562 $ 559 The changes in estimated costs relate primarily to the Quad Cities Station due to a change in the inflation rate and, for 2017, a new decommissioning study conducted by the operator of Quad Cities Station that changed the estimated amount and timing of cash flows. In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy discontinued sending CCR to surface impoundments effective April 2018 and will remove all CCR material located below the water table in such facilities, the latter of which is a more extensive closure activity than previously assumed. The incremental cost and timing of such actions is not currently reasonably determinable, but an evaluation of such estimates is expected to be completed in the first quarter of 2019, with any necessary adjustments to the related asset retirement obligations recognized at that time.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations Refer to Note 11 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations Nevada Power estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. Nevada Power does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain generation, transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Consolidated Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. These accruals totaled $320 million and $307 million as of December 31 , 2018 and 2017 , respectively. The following table presents Nevada Power 's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Waste water remediation $ 37 $ 39 Evaporative ponds and dry ash landfills 12 11 Asbestos 5 3 Solar 2 3 Other 27 24 Total asset retirement obligations $ 83 $ 80 The following table reconciles the beginning and ending balances of Nevada Power 's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 80 $ 83 Change in estimated costs 11 6 Retirements (11 ) (13 ) Accretion 3 4 Ending balance $ 83 $ 80 Reflected as: Other current liabilities $ 13 $ 4 Other long-term liabilities 70 76 $ 83 $ 80 In 2008, Nevada Power signed an administrative order of consent as owner and operator of Reid Gardner Generating Station Unit Nos. 1, 2 and 3 and as co-owner and operating agent of Unit No. 4. Based on the administrative order of consent, Nevada Power recorded estimated AROs and capital remediation costs. However, actual costs of work under the administrative order of consent may vary significantly once the scope of work is defined and additional site characterization has been completed. In connection with the termination of the co-ownership arrangement, effective October 22, 2013, between Nevada Power and California Department of Water Resources ("CDWR") for the Reid Gardner Generating Station Unit No. 4, Nevada Power and CDWR entered into a cost-sharing agreement that sets forth how the parties will jointly share in costs associated with all investigation, characterization and, if necessary, remedial activities as required under the administrative order of consent. Certain of Nevada Power 's decommissioning and reclamation obligations relate to jointly-owned facilities, and as such, Nevada Power is committed to pay a proportionate share of the decommissioning or reclamation costs. In the event of a default by any of the other joint participants, the respective subsidiary may be obligated to absorb, directly or by paying additional sums to the entity, a proportionate share of the defaulting party's liability. Management has identified legal obligations to retire generation plant assets specified in land leases for Nevada Power 's jointly-owned Navajo Generating Station and the Higgins Generating Station. Provisions of the lease require the lessees to remove the facilities upon request of the lessors at the expiration of the leases. Nevada Power 's estimated share of the decommissioning and reclamation obligations are primarily recorded as ARO liabilities in other long-term liabilities on the Consolidated Balance Sheets.
Sierra Pacific Power Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations Sierra Pacific estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. Sierra Pacific does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain generation, transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. These accruals totaled $210 million and $211 million as of December 31 , 2018 and 2017 , respectively. The following table presents Sierra Pacific 's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Asbestos $ 5 $ 5 Evaporative ponds and dry ash landfills 2 2 Other 3 3 Total asset retirement obligations $ 10 $ 10 The following table reconciles the beginning and ending balances of Sierra Pacific 's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 10 $ 10 Retirements — — Ending balance $ 10 $ 10 Reflected as: Other current liabilities $ — $ — Other long-term liabilities 10 10 $ 10 $ 10 Certain of Sierra Pacific 's decommissioning and reclamation obligations relate to jointly-owned facilities, and as such, Sierra Pacific is committed to pay a proportionate share of the decommissioning or reclamation costs. In the event of a default by any of the other joint participants, the respective subsidiary may be obligated to absorb, directly or by paying additional sums to the entity, a proportionate share of the defaulting party's liability. Sierra Pacific 's estimated share of the decommissioning and reclamation obligations are primarily recorded as ARO liabilities in other long-term liabilities on the Balance Sheets.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2018
Contractual Obligation [Line Items]
Commitments and Contingencies	Commitments and Contingencies Commitments The Company has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2018 are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 2,215 $ 1,659 $ 1,380 $ 1,174 $ 1,047 $ 11,155 $ 18,630 Construction commitments 2,330 587 52 — — — 2,969 Operating leases and easements 197 177 160 139 111 1,738 2,522 Maintenance, service and other contracts 306 344 303 277 241 1,358 2,829 $ 5,048 $ 2,767 $ 1,895 $ 1,590 $ 1,399 $ 14,251 $ 26,950 Fuel, Capacity and Transmission Contract Commitments The Utilities have fuel supply and related transportation and lime contracts for their coal- and natural gas-fueled generating facilities. The Utilities expect to supplement these contracts with additional contracts and spot market purchases to fulfill their future fossil fuel needs. The Utilities acquire a portion of their electricity through long-term purchases and exchange agreements. The Utilities have several power purchase agreements with renewable generating facilities that are not included in the table above as the payments are based on the amount of energy generated and there are no minimum payments. The Utilities also have contracts for the right to transmit electricity over other entities' transmission lines to facilitate delivery to their customers. MidAmerican Energy has long-term rail transportation contracts with BNSF Railway Company ("BNSF"), an affiliate company, and Union Pacific Railroad Company for the transportation of coal to all of the MidAmerican Energy-operated coal-fueled generating facilities. For the years ended December 31, 2018 , 2017 and 2016 , $111 million , $109 million and $137 million , respectively, were incurred for coal transportation services, the majority of which was related to the BNSF agreement. Construction Commitments The Company's firm construction commitments reflected in the table above include the following major construction projects: • MidAmerican Energy's construction of wind-powered generating facilities and the last of the four Multi-Value Projects approved by the Midcontinent Independent System Operator, Inc. for high voltage transmission lines in Iowa and Illinois in 2018. • ALP's investments in directly assigned transmission projects from the AESO . • PacifiCorp's costs associated with certain generating plant, transmission and distribution projects. Operating Leases and Easements The Company has non-cancelable operating leases primarily for office equipment, office space, certain operating facilities, land and rail cars. These leases generally require the Company to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. The Company also has non-cancelable easements for land on which certain of its assets, primarily wind-powered generating facilities, are located. Rent expense on non-cancelable operating leases and easements totaled $191 million for 2018 and $156 million for both 2017 and 2016 . Maintenance, Service and Other Contracts The Company has entered into service agreements related to its nonregulated solar and wind-powered projects with third parties to operate and maintain the projects under fixed-fee operating and maintenance agreements. Additionally, t he Company has various non-cancelable maintenance, service and other contracts primarily related to turbine and equipment maintenance and various other service agreements. BHE Renewables' Counterparty Risk On January 29, 2019, PG&E filed voluntary petitions for relief under chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Northern District of California. The Company owns 100% of Topaz and owns a 49% interest in Agua Caliente. Topaz is a 550 -MW solar photovoltaic electric power generating facility located in California. Topaz sells 100% of its energy, capacity and renewable energy credits generated from the facility to PG&E Utility under a 25-year wholesale power purchase agreement that is in effect until October 2039. As of December 31, 2018, the Company's consolidated balance sheet includes $1.1 billion of property, plant and equipment, net and $0.9 billion of non-recourse project debt related to Topaz. Agua Caliente is a 290 -MW solar photovoltaic electric power generating facility located in Arizona. Agua Caliente sells 100% of its energy, capacity and renewable energy credits generated from the facility to PG&E Utility under a 25-year wholesale power purchase agreement that is in effect until June 2039. As of December 31, 2018, the Company's equity investment in Agua Caliente totals $44 million and the project has $0.8 billion of non-recourse project debt owed to the United States Department of Energy. PG&E paid in full the December invoices for both Topaz and Agua Caliente, which were payable January 25, 2019. In addition, the Company continues to perform on its obligations and deliver renewable energy to the PG&E Utility, and PG&E has publicly stated it will pay suppliers in full under normal terms for post-petition goods and services received. The Company believes it is more likely than not that no impairment exists as post-petition contractual revenue payments are expected to be paid by PG&E Utility to the Topaz and Agua Caliente projects. The Company will continue to monitor the situation. Legal Matters The Company is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. The Company does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Environmental Laws and Regulations The Company is subject to federal, state, local and foreign laws and regulations regarding climate change, renewable portfolio standards, air and water quality, emissions performance standards, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact the Company's current and future operations. The Company believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the FERC. In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Among other things, the KHSA provided that the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it is determined dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. In April 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce) executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, in September 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC"), a private, independent nonprofit 501(c)(3) organization formed by certain signatories of the amended KSHA, jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also in September 2016, the KRRC filed an application with the FERC to surrender the license and decommission the same four facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. In March 2018, the FERC issued an order splitting the existing license for the Klamath Project into two licenses: the Klamath Project (P‑2082) contains East Side, West Side, Keno and Fall Creek developments; the new Lower Klamath Project (P‑14803) contains J.C. Boyle, Copco No. 1, Copco No. 2 and Iron Gate developments. In the same order, the FERC deferred consideration of the transfer of the license for the Lower Klamath facilities from PacifiCorp to the KRRC until some point in the future. PacifiCorp is currently the licensee for both the Klamath Project and Lower Klamath Project facilities and will retain ownership of the Klamath Project facilities after the approval and transfer of the Lower Klamath Project facilities. In April 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. In June 2018, the FERC granted PacifiCorp's motion to stay the effective date of the Lower Klamath Project license and all related compliance obligations, pending a FERC order on the license transfer. Meanwhile, the FERC continues to assess the KRRC's capacity to become a project licensee for purposes of dam removal. The United States Court of Appeals for the District of Columbia Circuit issued a decision in the Hoopa Valley Tribe v. FERC litigation, on January 25, 2019, finding that the states of California and Oregon have waived their Clean Water Act, Section 401, water quality certification authority over the Klamath hydroelectric project relicensing. PacifiCorp is evaluating the impact of this decision. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million , of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. As of December 31, 2018 , PacifiCorp's assets included $44 million of costs associated with the Klamath hydroelectric system's mainstem dams and the associated relicensing and settlement costs, which are being depreciated and amortized in accordance with state regulatory approvals through either December 31, 2019, or December 31, 2022, depending upon the state jurisdiction. Hydroelectric Commitments Certain of PacifiCorp's hydroelectric licenses contain requirements for PacifiCorp to make certain capital and operating expenditures related to its hydroelectric facilities. PacifiCorp estimates it is obligated to make capital expenditures of approximately $155 million over the next 10 years related to these licenses. Guarantees The Company has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on the Company's consolidated financial results.
PacifiCorp [Member]
Contractual Obligation [Line Items]
Commitments and Contingencies	Legal Matters PacifiCorp is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. PacifiCorp does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Environmental Laws and Regulations PacifiCorp is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact PacifiCorp's current and future operations. PacifiCorp believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the FERC. In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Among other things, the KHSA provided that the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it is determined dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. In April 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce) executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, in September 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC"), a private, independent nonprofit 501(c)(3) organization formed by certain signatories of the amended KSHA, jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also in September 2016, the KRRC filed an application with the FERC to surrender the license and decommission the same four facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. In March 2018, the FERC issued an order splitting the existing license for the Klamath Project into two licenses: the Klamath Project (P‑2082) contains East Side, West Side, Keno and Fall Creek developments; the new Lower Klamath Project (P‑14803) contains J.C. Boyle, Copco No. 1, Copco No. 2 and Iron Gate developments. In the same order, the FERC deferred consideration of the transfer of the license for the Lower Klamath facilities from PacifiCorp to the KRRC until some point in the future. PacifiCorp is currently the licensee for both the Klamath Project and Lower Klamath Project facilities and will retain ownership of the Klamath Project facilities after the approval and transfer of the Lower Klamath Project facilities. In April 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. In June 2018, the FERC granted PacifiCorp's motion to stay the effective date of the Lower Klamath Project license and all related compliance obligations, pending a FERC order on the license transfer. Meanwhile, the FERC continues to assess the KRRC's capacity to become a project licensee for purposes of dam removal. The United States Court of Appeals for the District of Columbia Circuit issued a decision in the Hoopa Valley Tribe v. FERC litigation, on January 25, 2019, finding that the states of California and Oregon have waived their Clean Water Act, Section 401, water quality certification authority over the Klamath hydroelectric project relicensing. PacifiCorp is evaluating the impact of this decision. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million , of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. As of December 31, 2018 , PacifiCorp's assets included $44 million of costs associated with the Klamath hydroelectric system's mainstem dams and the associated relicensing and settlement costs, which are being depreciated and amortized in accordance with state regulatory approvals through either December 31, 2019, or December 31, 2022, depending upon the state jurisdiction. Hydroelectric Commitments Certain of PacifiCorp's hydroelectric licenses contain requirements for PacifiCorp to make certain capital and operating expenditures related to its hydroelectric facilities. PacifiCorp estimates it is obligated to make capital expenditures of approximately $155 million over the next 10 years related to these licenses. Commitments PacifiCorp has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2018 are as follows (in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Contract type: Purchased electricity contracts - commercially operable $ 317 $ 194 $ 155 $ 152 $ 145 $ 1,522 $ 2,485 Purchased electricity contracts - non-commercially operable 13 21 48 49 49 797 977 Fuel contracts 732 648 521 326 268 976 3,471 Construction commitments 888 559 2 — — — 1,449 Transmission 108 95 80 69 63 427 842 Operating leases and easements 7 6 7 6 5 90 121 Maintenance, service and other contracts 52 25 26 16 8 81 208 Total commitments $ 2,117 $ 1,548 $ 839 $ 618 $ 538 $ 3,893 $ 9,553 Purchased Electricity Contracts - Commercially Operable As part of its energy resource portfolio, PacifiCorp acquires a portion of its electricity through long-term purchases and exchange agreements. PacifiCorp has several power purchase agreements with wind-powered generating facilities that are not included in the table above as the payments are based on the amount of energy generated and there are no minimum payments. Included in the purchased electricity payments are any power purchase agreements that meet the definition of a lease. Rent expense related to those power purchase agreements that meet the definition of a lease totaled $26 million for 2018 and $14 million for 2017 and 2016 . Included in the minimum fixed annual payments for purchased electricity above are commitments to purchase electricity from several hydroelectric systems under long-term arrangements with public utility districts. These purchases are made on a "cost-of-service" basis for a stated percentage of system output and for a like percentage of system operating expenses and debt service. These costs are included in energy costs on the Consolidated Statements of Operations. PacifiCorp is required to pay its portion of operating costs and its portion of the debt service, whether or not any electricity is produced. These arrangements accounted for less than 5% of PacifiCorp's 2018 , 2017 and 2016 energy sources. Purchased Electricity Contracts - Non-commercially Operable PacifiCorp has several contracts for purchases of electricity from facilities that have not yet achieved commercial operation. To the extent any of these facilities do not achieve commercial operation, PacifiCorp has no obligation to the counterparty. Fuel Contracts PacifiCorp has "take or pay" coal and natural gas contracts that require minimum payments. Construction Commitments PacifiCorp's construction commitments included in the table above relate to firm commitments and include costs associated with certain generating plant, transmission, and distribution projects. Transmission PacifiCorp has contracts for the right to transmit electricity over other entities' transmission lines to facilitate delivery to PacifiCorp's customers. Operating Leases and Easements PacifiCorp has non-cancelable operating leases primarily for certain operating facilities, office space, land and equipment that expire at various dates through the year ending December 31, 2096. These leases generally require PacifiCorp to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. PacifiCorp also has non-cancelable easements for land on which certain of its assets, primarily wind-powered generating facilities, are located. Rent expense totaled $15 million for the years ended December 31, 2018 , 2017 and 2016 . Guarantees PacifiCorp has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on PacifiCorp's consolidated financial results.
MidAmerican Energy Company [Member]
Contractual Obligation [Line Items]
Commitments and Contingencies	Commitments and Contingencies Commitments MidAmerican Energy had the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31, 2018 , are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Coal and natural gas for generation $ 96 $ 21 $ 17 $ 13 $ 5 $ — $ 152 Electric capacity and transmission 29 28 26 15 7 36 141 Natural gas contracts for gas operations 145 76 59 45 23 30 378 Construction commitments 1,299 28 50 — — — 1,377 Easements and operating leases 27 29 29 30 30 1,078 1,223 Maintenance and services contracts 118 196 147 143 134 224 962 $ 1,714 $ 378 $ 328 $ 246 $ 199 $ 1,368 $ 4,233 Coal, Natural Gas, Electric Capacity and Transmission Commitments MidAmerican Energy has coal supply and related transportation and lime contracts for its coal-fueled generating facilities. MidAmerican Energy expects to supplement the coal contracts with additional contracts and spot market purchases to fulfill its future coal supply needs. Additionally, MidAmerican Energy has a natural gas transportation contract for a natural gas-fueled generating facility. The contracts have minimum payment commitments ranging through 2023 . MidAmerican Energy has various natural gas supply and transportation contracts for its regulated natural gas operations that have minimum payment commitments ranging through 2037 . MidAmerican Energy has contracts to purchase electric capacity that have minimum payment commitments ranging through 2028 . MidAmerican Energy also has contracts for the right to transmit electricity over other entities' transmission lines with minimum payment commitments ranging through 2022 . Construction Commitments MidAmerican Energy's firm construction commitments reflected in the table above consist primarily of contracts for the construction and repowering of wind-powered generating facilities in 2019. Easements and Operating Leases MidAmerican Energy has non-cancelable easements with minimum payment commitments ranging through 2061 for land in Iowa on which certain of its assets, primarily wind-powered generating facilities, are located. MidAmerican Energy also has non-cancelable operating leases with minimum payment commitments ranging through 2024 primarily for office and other building space. These leases generally require MidAmerican Energy to pay for insurance, taxes and maintenance applicable to the leased property. A number of the leases contain renewal options for varying periods. Rent expense on non-cancelable operating leases totaled $3 million , $3 million and $4 million for 2018 , 2017 and 2016 , respectively. Maintenance, Services and Other Contracts MidAmerican Energy has other non-cancelable contracts primarily related to maintenance and services for various generating facilities with minimum payment commitments ranging through 2028 . Environmental Laws and Regulations MidAmerican Energy is subject to federal, state and local laws and regulations regarding air and water quality, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact its current and future operations. MidAmerican Energy believes it is in material compliance with all applicable laws and regulations. Transmission Rates MidAmerican Energy's wholesale transmission rates are set annually using FERC-approved formula rates subject to true-up for actual cost of service. Prior to September 2016, the rates in effect were based on a 12.38% return on equity ("ROE"). In November 2013 and February 2015, a coalition of intervenors filed successive complaints with the FERC requesting that the 12.38% ROE no longer be found just and reasonable and sought to reduce the base ROE to 9.15% and 8.67% , respectively. MidAmerican Energy is authorized by the FERC to include a 0.50% adder beyond the base ROE effective January 2015. In September 2016, the FERC issued an order for the first complaint, which reduces the base ROE to 10.32% and requires refunds, plus interest, for the period from November 2013 through February 2015. Customer refunds relative to the first complaint occurred in February 2017. It is uncertain when the FERC will rule on the second complaint, covering the period from February 2015 through May 2016. MidAmerican Energy believes it is probable that the FERC will order a base ROE lower than 12.38% in the second complaint and, as of December 31, 2018 , has accrued a $10 million liability for refunds of amounts collected under the higher ROE from March 2015 through May 2016. Legal Matters MidAmerican Energy is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Energy does not believe that such normal and routine litigation will have a material impact on its financial results.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Contractual Obligation [Line Items]
Commitments and Contingencies	Commitments and Contingencies Refer to Note 13 of MidAmerican Energy's Notes to Financial Statements. Legal Matters MidAmerican Funding is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Funding does not believe that such normal and routine litigation will have a material impact on its consolidated financial results.
Nevada Power Company [Member]
Contractual Obligation [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Nevada Power is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Nevada Power 's current and future operations. Nevada Power believes it is in material compliance with all applicable laws and regulations. Senate Bill 123 In June 2013, the Nevada State Legislature passed Senate Bill No. 123 ("SB 123"), which included the retirement of coal plants and replacing the capacity with renewable facilities and other generating facilities. In May 2014, Nevada Power filed its ERCR Plan in compliance with SB 123. In July 2015, Nevada Power filed an amendment to its ERCR Plan with the PUCN which was approved in September 2015. In June 2015, the Nevada State Legislature passed Assembly Bill No. 498, which modified the capacity replacement components of SB 123. In compliance with Senate Bill No. 123, Nevada Power retired 557 MWs of coal-fueled generation in 2017 and will retire an additional 255 MWs of coal-fueled generation in 2019. Consistent with the Emissions Reduction and Capacity Replacement Plan ("ERCR Plan"), between 2014 and 2016, Nevada Power acquired 536 MWs of natural gas generating resources, executed long-term power purchase agreements for 200 M Ws of nameplate renewable energy capacity and constructed a 15 -MW solar photovoltaic facility. Nevada Power has the option to acquire 35 MWs of nameplate renewable energy capacity in the future under the ERCR Plan, subject to PUCN approval. Legal Matters Nevada Power is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Nevada Power does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Nevada Power is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts. Commitments Nevada Power has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31 , 2018 are as follows (in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 612 $ 459 $ 379 $ 383 $ 386 $ 4,925 $ 7,144 Fuel and capacity contract commitments (not commercially operable) — 1 6 40 40 982 1,069 Operating leases and easements 10 7 7 8 7 59 98 Maintenance, service and other contracts 46 41 44 37 23 26 217 Total commitments $ 668 $ 508 $ 436 $ 468 $ 456 $ 5,992 $ 8,528 Fuel and Capacity Contract Commitments Purchased Power Nevada Power has several contracts for long-term purchase of electric energy which have been approved by the PUCN. The expiration of these contracts range from 2019 to 2067 . Purchased power includes contracts which meet the definition of a lease. Nevada Power 's operations and maintenance expense for purchase power contracts which met the lease criteria for 2018 , 2017 and 2016 were $271 million , $310 million and $302 million , respectively, and are recorded as cost of fuel, energy and capacity on the Consolidated Statements of Operations. Coal and Natural Gas Nevada Power has a contract for the transportation of coal that extends through 2019 . Additionally, gas transportation contracts expire from 2022 to 2032 and the gas supply contracts expires from 2019 to 2020 . Fuel and Capacity Contract Commitments - Not Commercially Operable Nevada Power has several contracts for long-term purchase of electric energy in which the facility remains under development. Amounts represent the estimated payments under renewable energy power purchase contracts, which have been approved by the PUCN and are contingent upon the developers obtaining commercial operation and their ability to deliver power. Operating Leases and Easements Nevada Power has non-cancelable operating leases primarily for office equipment, office space, certain operating facilities, vehicles and land. These leases generally require Nevada Power to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. Nevada Power also has non-cancelable easements for land. Operations and maintenance expense on non-cancelable operating leases and easements totaled $7 million , $9 million and $13 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. Maintenance, Service and Other Contracts Nevada Power has long-term service agreements for the performance of maintenance on generation units. Obligation amounts are based on estimated usage. The estimated expiration of these service agreements range from 2019 to 2026 .
Sierra Pacific Power Company [Member]
Contractual Obligation [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Sierra Pacific is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Sierra Pacific 's current and future operations. Sierra Pacific believes it is in material compliance with all applicable laws and regulations. Legal Matters Sierra Pacific is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Sierra Pacific does not believe that such normal and routine litigation will have a material impact on its financial results. Sierra Pacific is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts. Commitments Sierra Pacific has the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31 , 2018 are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 204 $ 154 $ 117 $ 81 $ 61 $ 502 $ 1,119 Fuel and capacity contract commitments (not commercially operable) 8 16 28 58 58 1,394 1,562 Operating leases and easements 4 4 4 3 2 56 73 Maintenance, service and other contracts 8 7 6 6 2 1 30 Total commitments $ 224 $ 181 $ 155 $ 148 $ 123 $ 1,953 $ 2,784 Fuel and Capacity Contract Commitments Purchased Power Sierra Pacific has several contracts for long-term purchase of electric energy which have been approved by the PUCN. The expiration of these contracts range from 2019 to 2045 . Purchased power includes contracts which meet the definition of a lease. Sierra Pacific 's operating and maintenance expense for purchase power contracts which met the lease criteria for 2018 , 2017 and 2016 were $72 million , $74 million and $69 million , respectively, and are recorded as cost of fuel, energy and capacity on the Statements of Operations. Coal and Natural Gas Sierra Pacific has a long-term contract for the transport of coal that expires in 2019 . Additionally, gas transportation contracts expire from 2019 to 2046 and the gas supply contracts expire from 2019 to 2020 . Operating Leases and Easements Sierra Pacific has non-cancelable operating leases primarily for office equipment, office space, certain operating facilities, vehicles and land. These leases generally require Sierra Pacific to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. Sierra Pacific also has non-cancelable easements for land. Operating and maintenance expense on non-cancelable operating leases and easements totaled $4 million , $4 million and $6 million for the year-ended December 31 , 2018 , 2017 and 2016 , respectively. Maintenance, Service and Other Contracts Sierra Pacific has long-term service agreements for the performance of maintenance on generation units. Obligation amounts are based on estimated usage. The estimated expiration of these service agreements range from 2019 to 2039 .

Preferred Stock (Notes)

Preferred Stock (Notes)	12 Months Ended
	Dec. 31, 2018
PacifiCorp [Member]
Class of Stock [Line Items]
Preferred Stock [Text Block]	PacifiCorp has 3,500 thousand shares of Serial Preferred Stock authorized at the stated value of $100 per share. PacifiCorp had 24 thousand shares of Serial Preferred Stock issued and outstanding as of December 31, 2018 and 2017 . The outstanding preferred stock series are non-redeemable and have annual dividend rates of 6.00% and 7.00% . In the event of voluntary liquidation, all preferred stock is entitled to stated value or a specified preference amount per share plus accrued dividends. Upon involuntary liquidation, all preferred stock is entitled to stated value plus accrued dividends. Dividends on all preferred stock are cumulative. Holders also have the right to elect members to the PacifiCorp Board of Directors in the event dividends payable are in default in an amount equal to four full quarterly payments. PacifiCorp also has 16 million shares of No Par Serial Preferred Stock and 127 thousand shares of 5% Preferred Stock authorized, but no shares were issued or outstanding as of December 31, 2018 and 2017 .

BHE Shareholders' Equity (Notes

BHE Shareholders' Equity (Notes)	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
BHE Shareholders' Equity [Text Block]	BHE Shareholders' Equity Common Stock On March 14, 2000, and as amended on December 7, 2005, BHE 's shareholders entered into a Shareholder Agreement that provides specific rights to certain shareholders. One of these rights allows certain shareholders the ability to put their common shares to BHE at the then-current fair value dependent on certain circumstances controlled by BHE . For the years ended December 31, 2018 and 2017, BHE repurchased 177,381 shares of its common stock for $107 million and 35,000 shares of its common stock for $19 million , respectively. For the year ended December 31, 2017, BHE issued $100 million of its 5.00% junior subordinated debentures due June 2057 in exchange for 181,819 shares of its common stock. In February 2019, BHE repurchased 447,712 shares of its common stock for $293 million . Restricted Net Assets BHE has maximum debt-to-total capitalization percentage restrictions imposed by its senior unsecured credit facilities expiring in June 2021 which, in certain circumstances, limit BHE 's ability to make cash dividends or distributions. As a result of this restriction, BHE has restricted net assets of $16.5 billion as of December 31, 2018 . Certain of BHE 's subsidiaries have restrictions on their ability to dividend, loan or advance funds to BHE due to specific legal or regulatory restrictions, including, but not limited to, maximum debt-to-total capitalization percentages and commitments made to state commissions or federal agencies in connection with past acquisitions. As a result of these restrictions, BHE 's subsidiaries had restricted net assets of $20.7 billion as of December 31, 2018 .

Common Shareholder's Equity Com

Common Shareholder's Equity Common Shareholder's Equity (Notes)	12 Months Ended
	Dec. 31, 2018
Class of Stock [Line Items]
Common Shareholder's Equity [Text Block]	BHE Shareholders' Equity Common Stock On March 14, 2000, and as amended on December 7, 2005, BHE 's shareholders entered into a Shareholder Agreement that provides specific rights to certain shareholders. One of these rights allows certain shareholders the ability to put their common shares to BHE at the then-current fair value dependent on certain circumstances controlled by BHE . For the years ended December 31, 2018 and 2017, BHE repurchased 177,381 shares of its common stock for $107 million and 35,000 shares of its common stock for $19 million , respectively. For the year ended December 31, 2017, BHE issued $100 million of its 5.00% junior subordinated debentures due June 2057 in exchange for 181,819 shares of its common stock. In February 2019, BHE repurchased 447,712 shares of its common stock for $293 million . Restricted Net Assets BHE has maximum debt-to-total capitalization percentage restrictions imposed by its senior unsecured credit facilities expiring in June 2021 which, in certain circumstances, limit BHE 's ability to make cash dividends or distributions. As a result of this restriction, BHE has restricted net assets of $16.5 billion as of December 31, 2018 . Certain of BHE 's subsidiaries have restrictions on their ability to dividend, loan or advance funds to BHE due to specific legal or regulatory restrictions, including, but not limited to, maximum debt-to-total capitalization percentages and commitments made to state commissions or federal agencies in connection with past acquisitions. As a result of these restrictions, BHE 's subsidiaries had restricted net assets of $20.7 billion as of December 31, 2018 .
PacifiCorp [Member]
Class of Stock [Line Items]
Common Shareholder's Equity [Text Block]	Common Shareholder's Equity Through PPW Holdings, BHE is the sole shareholder of PacifiCorp's common stock. The state regulatory orders that authorized BHE's acquisition of PacifiCorp contain restrictions on PacifiCorp's ability to pay dividends to the extent that they would reduce PacifiCorp's common equity below specified percentages of defined capitalization. As of December 31, 2018 , the most restrictive of these commitments prohibits PacifiCorp from making any distribution to PPW Holdings or BHE without prior state regulatory approval to the extent that it would reduce PacifiCorp's common equity below 44% of its total capitalization, excluding short-term debt and current maturities of long-term debt. As of December 31, 2018 , PacifiCorp's actual common equity percentage, as calculated under this measure, was 54% , and PacifiCorp would have been permitted to dividend $2.6 billion under this commitment. These commitments also restrict PacifiCorp from making any distributions to either PPW Holdings or BHE if PacifiCorp's senior unsecured debt rating is BBB- or lower by Standard & Poor's Rating Services or Fitch Ratings, or Baa3 or lower by Moody's Investor Service, as indicated by two of the three rating services. As of December 31, 2018 , PacifiCorp met the minimum required senior unsecured debt ratings for making distributions. PacifiCorp is also subject to a maximum debt-to-total capitalization percentage under various financing agreements as further discussed in Note 6 .

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss, Net (Notes)	12 Months Ended
	Dec. 31, 2018
Schedule of accumulated other comprehensive income (loss)
Comprehensive Income (Loss)	Components of Accumulated Other Comprehensive Loss, Net The following table shows the change in accumulated other comprehensive loss attributable to BHE shareholders by each component of other comprehensive income (loss), net of applicable income taxes, for the year ended December 31 (in millions): Unrecognized Foreign Unrealized Unrealized AOCI Amounts on Currency Gains on Gains on Attributable Retirement Translation Marketable Cash Flow To BHE Benefits Adjustment Securities Hedges Shareholders, Net Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive (loss) income (9 ) (583 ) (30 ) 19 (603 ) Balance, December 31, 2016 (447 ) (1,675 ) 585 26 (1,511 ) Other comprehensive income 64 546 500 3 1,113 Balance, December 31, 2017 (383 ) (1,129 ) 1,085 29 (398 ) Adoption of ASU 2016-01 — — (1,085 ) — (1,085 ) Other comprehensive income (loss) 25 (494 ) — 7 (462 ) Balance, December 31, 2018 $ (358 ) $ (1,623 ) $ — $ 36 $ (1,945 ) Reclassifications from AOCI to net income for the years ended December 31, 2018 , 2017 and 2016 were insignificant. Additionally, refer to the "Foreign Operations" discussion in Note 12 for information about unrecognized amounts on retirement benefits reclassifications from AOCI that do not impact net income in their entirety.
PacifiCorp [Member]
Schedule of accumulated other comprehensive income (loss)
Comprehensive Income (Loss)	Accumulated other comprehensive loss, net consists of unrecognized amounts on retirement benefits, net of tax, of $13 million and $15 million as of December 31, 2018 and 2017 , respectively.
MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Comprehensive Income (Loss)	Components of Accumulated Other Comprehensive Loss, Net The following table shows the change in accumulated other comprehensive loss by each component of other comprehensive income, net of applicable income taxes, for the year ended December 31, 2016 (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 3 — 3 Dividend of unregulated retail services business — 27 27 Balance, December 31, 2016 $ — $ — $ — On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of accumulated other comprehensive income (loss)
Comprehensive Income (Loss)	Components of Accumulated Other Comprehensive Loss, Net Refer to Note 14 of MidAmerican Energy's Notes to Financial Statements.

Variable-Interest Entities Vari

Variable-Interest Entities Variable-Interest Entities (Notes)	12 Months Ended
	Dec. 31, 2018
PacifiCorp [Member]
Schedule of Equity Method Investments [Line Items]
Variable Interest Entity Disclosure [Text Block]	Variable-Interest Entities PacifiCorp holds a two-thirds interest in Bridger Coal Company ("Bridger Coal"), which supplies coal to the Jim Bridger generating facility that is owned two-thirds by PacifiCorp and one-third by PacifiCorp's joint venture partner in Bridger Coal. PacifiCorp purchases two-thirds of the coal produced by Bridger Coal, while the remaining coal is purchased by the joint venture partner. The power to direct the activities that most significantly impact Bridger Coal's economic performance are shared with the joint venture partner. Each joint venture partner is jointly and severally liable for the obligations of Bridger Coal. Bridger Coal's necessary working capital to carry out its mining operations is financed by contributions from PacifiCorp and its joint venture partner. PacifiCorp's equity investment in Bridger Coal was $100 million and $137 million as of December 31, 2018 and 2017 , respectively. Refer to Note 19 for information regarding related-party transactions with Bridger Coal.

Noncontrolling Interests (Notes

Noncontrolling Interests (Notes)	12 Months Ended
	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Noncontrolling Interests [Text Block]	Noncontrolling Interests Included in noncontrolling interests on the Consolidated Balance Sheets are preferred securities of subsidiaries of $58 million as of December 31, 2018 and 2017 , consisting of $56 million of 8.061% cumulative preferred securities of Northern Electric plc., a subsidiary of Northern Powergrid , which are redeemable in the event of the revocation of Northern Electric plc.'s electricity distribution license by the Secretary of State, and $2 million of nonredeemable preferred stock of PacifiCorp.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Noncontrolling Interest [Line Items]
Other, Net [Text Block]	Other Income (Expense) - Other, Net Other, net, as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Gains on sales of assets and other investments 1 1 3 Loss on debt tender offer — (29 ) — Interest income and other, net 3 6 3 Total $ 31 $ 9 $ 34 Refer to Note 8 for information regarding the debt tender offer.

Segment Information (Notes)

Segment Information (Notes)	12 Months Ended
	Dec. 31, 2018
Segment Reporting Information [Line Items]
Segment Information [Text Block]	Segment Information The Company's reportable segments with foreign operations include Northern Powergrid , whose business is principally in the United Kingdom, BHE Transmission , whose business includes operations in Canada, and BHE Renewables , whose business includes operations in the Philippines. Intersegment eliminations and adjustments, including the allocation of goodwill, have been made. Information related to the Company's reportable segments is shown below (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: PacifiCorp $ 5,026 $ 5,237 $ 5,201 MidAmerican Funding 3,053 2,846 2,631 NV Energy 3,039 3,015 2,895 Northern Powergrid 1,020 949 995 BHE Pipeline Group 1,203 993 978 BHE Transmission 710 699 502 BHE Renewables 908 838 743 HomeServices 4,214 3,443 2,801 BHE and Other (1) 614 594 676 Total operating revenue $ 19,787 $ 18,614 $ 17,422 Depreciation and amortization: PacifiCorp $ 979 $ 796 $ 783 MidAmerican Funding 609 500 479 NV Energy 456 422 421 Northern Powergrid 250 214 200 BHE Pipeline Group 126 159 206 BHE Transmission 247 239 241 BHE Renewables 268 251 230 HomeServices 51 66 31 BHE and Other (1) (2 ) (1 ) — Total depreciation and amortization $ 2,984 $ 2,646 $ 2,591 Operating income: PacifiCorp $ 1,051 $ 1,440 $ 1,429 MidAmerican Funding 550 544 551 NV Energy 607 766 774 Northern Powergrid 486 488 500 BHE Pipeline Group 525 473 455 BHE Transmission 313 322 92 BHE Renewables 325 316 256 HomeServices 214 214 212 BHE and Other (1) 1 (41 ) (22 ) Total operating income 4,072 4,522 4,247 Interest expense (1,838 ) (1,841 ) (1,854 ) Capitalized interest 61 45 139 Allowance for equity funds 104 76 158 Interest and dividend income 113 111 120 (Losses) gains on marketable securities, net (538 ) 14 10 Other, net (9 ) (420 ) 30 Total income before income tax (benefit) expense and equity income (loss) $ 1,965 $ 2,507 $ 2,850 Years Ended December 31, 2018 2017 2016 Interest expense: PacifiCorp $ 384 $ 381 $ 381 MidAmerican Funding 247 237 218 NV Energy 224 233 250 Northern Powergrid 141 133 136 BHE Pipeline Group 43 43 50 BHE Transmission 167 169 153 BHE Renewables 201 204 198 HomeServices 23 7 2 BHE and Other (1) 408 434 466 Total interest expense $ 1,838 $ 1,841 $ 1,854 Income tax (benefit) expense: PacifiCorp $ 5 $ 362 $ 341 MidAmerican Funding (262 ) (202 ) (139 ) NV Energy 100 221 200 Northern Powergrid 61 57 22 BHE Pipeline Group 119 170 163 BHE Transmission 7 (124 ) 26 BHE Renewables (2) (158 ) (795 ) (32 ) HomeServices 52 49 81 BHE and Other (1) (507 ) (292 ) (259 ) Total income tax (benefit) expense $ (583 ) $ (554 ) $ 403 Capital expenditures: PacifiCorp $ 1,257 $ 769 $ 903 MidAmerican Funding 2,332 1,776 1,637 NV Energy 503 456 529 Northern Powergrid 566 579 579 BHE Pipeline Group 427 286 226 BHE Transmission 270 334 466 BHE Renewables 817 323 719 HomeServices 47 37 20 BHE and Other 22 11 11 Total capital expenditures $ 6,241 $ 4,571 $ 5,090 As of December 31, 2018 2017 2016 Property, plant and equipment, net: PacifiCorp $ 19,591 $ 19,203 $ 19,162 MidAmerican Funding 16,171 14,221 12,835 NV Energy 9,852 9,770 9,825 Northern Powergrid 6,007 6,075 5,148 BHE Pipeline Group 4,904 4,587 4,423 BHE Transmission 5,824 6,330 5,810 BHE Renewables 6,155 5,637 5,302 HomeServices 141 117 78 BHE and Other (50 ) (69 ) (74 ) Total property, plant and equipment, net $ 68,595 $ 65,871 $ 62,509 Total assets: PacifiCorp $ 23,478 $ 23,086 $ 23,563 MidAmerican Funding 20,029 18,444 17,571 NV Energy 14,119 13,903 14,320 Northern Powergrid 7,427 7,565 6,433 BHE Pipeline Group 5,511 5,134 5,144 BHE Transmission 8,424 9,009 8,378 BHE Renewables 8,666 7,687 7,010 HomeServices 2,797 2,722 1,776 BHE and Other 1,738 2,658 1,245 Total assets $ 92,189 $ 90,208 $ 85,440 Years Ended December 31, 2018 2017 2016 Operating revenue by country: United States $ 18,014 $ 16,916 $ 15,895 United Kingdom 1,017 948 995 Canada 710 699 506 Philippines and other 46 51 26 Total operating revenue by country $ 19,787 $ 18,614 $ 17,422 Income before income tax (benefit) expense and equity income (loss) by country: United States $ 1,425 $ 1,927 $ 2,264 United Kingdom 307 313 382 Canada 155 167 135 Philippines and other 78 100 69 Total income before income tax (benefit) expense and equity (loss) income by country: $ 1,965 $ 2,507 $ 2,850 As of December 31, 2018 2017 2016 Property, plant and equipment, net by country: United States $ 56,870 $ 53,579 $ 51,671 United Kingdom 5,895 5,953 5,020 Canada 5,817 6,323 5,803 Philippines and other 13 16 15 Total property, plant and equipment, net by country $ 68,595 $ 65,871 $ 62,509 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate to other corporate entities, including MidAmerican Energy Services, LLC, corporate functions and intersegment eliminations. (2) Income tax (benefit) expense includes the tax attributes of disregarded entities that are not required to pay income taxes and the earnings of which are taxable directly to BHE. The following table shows the change in the carrying amount of goodwill by reportable segment for the years ended December 31, 2018 and 2017 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 930 $ 75 $ 1,470 $ 95 $ 840 $ — $ 9,010 Acquisitions — — — — — — — 508 — 508 Foreign currency translation — — — 61 — 101 — — — 162 Other — — — — (2 ) — — — — (2 ) December 31, 2017 1,129 2,102 2,369 991 73 1,571 95 1,348 — 9,678 Acquisitions — — — — — — — 79 — 79 Foreign currency translation — — — (39 ) — (123 ) — — — (162 ) December 31, 2018 $ 1,129 $ 2,102 $ 2,369 $ 952 $ 73 $ 1,448 $ 95 $ 1,427 $ — $ 9,595
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Segment Information [Text Block]	Segment Information MidAmerican Energy has identified two reportable operating segments: regulated electric and regulated natural gas. The previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information below related to the statements of operations for all periods presented. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost. Refer to Note 9 for a discussion of items affecting income tax (benefit) expense for the regulated electric and natural gas operating segments. The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 2,283 $ 2,108 $ 1,985 Regulated natural gas 754 719 637 Other 12 10 3 Total operating revenue $ 3,049 $ 2,837 $ 2,625 Depreciation and amortization: Regulated electric $ 565 $ 458 $ 436 Regulated natural gas 44 42 43 Total depreciation and amortization $ 609 $ 500 $ 479 Years Ended December 31, 2018 2017 2016 Operating income: Regulated electric $ 469 $ 472 $ 486 Regulated natural gas 81 72 64 Other 1 (1 ) — Total operating income $ 551 $ 543 $ 550 Interest expense: Regulated electric $ 208 $ 196 $ 178 Regulated natural gas 19 18 18 Total interest expense $ 227 $ 214 $ 196 Income tax (benefit) expense: Regulated electric $ (273 ) $ (212 ) $ (156 ) Regulated natural gas 16 29 22 Other 2 — 2 Total income tax (benefit) expense $ (255 ) $ (183 ) $ (132 ) Net income: Regulated electric $ 628 $ 570 $ 512 Regulated natural gas 54 35 32 Other — — (2 ) Net income $ 682 $ 605 $ 542 Years Ended December 31, 2018 2017 2016 Capital expenditures: Regulated electric $ 2,223 $ 1,686 $ 1,564 Regulated natural gas 109 87 72 Total capital expenditures $ 2,332 $ 1,773 $ 1,636 As of December 31, 2018 2017 2016 Total assets: Regulated electric $ 16,511 $ 14,914 $ 14,113 Regulated natural gas 1,406 1,403 1,345 Other 3 1 1 Total assets $ 17,920 $ 16,318 $ 15,459
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Segment Information [Text Block]	Segment Information MidAmerican Funding has identified two reportable operating segments: regulated electric and regulated natural gas. The previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information below related to the statements of operations for all periods presented. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost. "Other" in the tables below consists of the nonregulated subsidiaries of MidAmerican Funding not engaged in the energy business and parent company interest expense. Refer to Note 9 for a discussion of items affecting income tax (benefit) expense for the regulated electric and natural gas operating segments. The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 2,283 $ 2,108 $ 1,985 Regulated natural gas 754 719 637 Other 16 19 9 Total operating revenue $ 3,053 $ 2,846 $ 2,631 Depreciation and amortization: Regulated electric $ 565 $ 458 $ 436 Regulated natural gas 44 42 43 Total depreciation and amortization $ 609 $ 500 $ 479 Operating income: Regulated electric $ 469 $ 472 $ 486 Regulated natural gas 81 72 64 Other — — 1 Total operating income $ 550 $ 544 $ 551 Interest expense: Regulated electric $ 208 $ 196 $ 178 Regulated natural gas 19 18 18 Other 20 23 23 Total interest expense $ 247 $ 237 $ 219 Income tax (benefit) expense: Regulated electric $ (273 ) $ (212 ) $ (156 ) Regulated natural gas 16 29 22 Other (5 ) (19 ) (5 ) Total income tax (benefit) expense $ (262 ) $ (202 ) $ (139 ) Net income: Regulated electric $ 628 $ 570 $ 512 Regulated natural gas 54 35 32 Other (13 ) (31 ) (12 ) Net income $ 669 $ 574 $ 532 Years Ended December 31, 2018 2017 2016 Capital expenditures: Regulated electric $ 2,223 $ 1,686 $ 1,564 Regulated natural gas 109 87 72 Total capital expenditures $ 2,332 $ 1,773 $ 1,636 As of December 31, 2018 2017 2016 Total assets: Regulated electric $ 17,702 $ 16,105 $ 15,304 Regulated natural gas 1,485 1,482 1,424 Other 15 34 19 Total assets $ 19,202 $ 17,621 $ 16,747 Goodwill by reportable segment as of December 31, 2018 and 2017 , was as follows (in millions): Regulated electric $ 1,191 Regulated natural gas 79 Total $ 1,270
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Segment Information [Text Block]	Segment Information Sierra Pacific has identified two reportable operating segments: regulated electric and regulated natural gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting natural gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by the PUCN; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 752 $ 713 $ 702 Regulated gas 103 99 110 Total operating revenue $ 855 $ 812 $ 812 Operating income: Regulated electric $ 136 $ 175 $ 162 Regulated gas 16 22 19 Total operating income 152 197 181 Interest expense (44 ) (43 ) (54 ) Allowance for borrowed funds 1 2 4 Allowance for equity funds 4 3 (1 ) Other, net 9 5 3 Income before income tax expense $ 122 $ 164 $ 133 As of December 31, 2018 2017 2016 Assets Regulated electric $ 3,177 $ 3,103 $ 3,119 Regulated gas 314 300 314 Regulated common assets (1) 78 10 60 Total assets $ 3,569 $ 3,413 $ 3,493 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Unaudited Quarterly Operating R

Unaudited Quarterly Operating Results Unaudited Quarterly Operating Results (Notes)	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member]
Quarterly Operating Results [Line Items]
Quarterly Financial Information [Text Block]	Unaudited Quarterly Operating Results (in millions) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenue $ 746 $ 717 $ 832 $ 754 Operating income 79 87 278 107 Net income (loss) 106 106 483 (13 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenue $ 695 $ 658 $ 813 $ 671 Operating income 102 130 284 27 Net income 105 134 385 (19 ) Quarterly operating results are affected by, among other things, MidAmerican Energy's seasonal retail electricity prices, the timing of recognition of federal renewable electricity production tax credits related to MidAmerican Energy's wind-powered generating facilities and the seasonal impact of weather on electricity and natural gas sales.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Quarterly Operating Results [Line Items]
Quarterly Financial Information [Text Block]	Unaudited Quarterly Operating Results (in millions) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenue $ 747 $ 718 $ 832 $ 756 Operating income 79 87 278 106 Net income (loss) 103 103 479 (16 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenue $ 696 $ 659 $ 815 $ 676 Operating income 102 131 284 27 Net income 102 131 383 (42 ) Quarterly operating results are affected by, among other things, MidAmerican Energy's seasonal retail electricity prices, the timing of recognition of federal renewable electricity production tax credits related to MidAmerican Energy's wind-powered generating facilities and the seasonal impact of weather on electricity and natural gas sales.
Nevada Power Company [Member]
Quarterly Operating Results [Line Items]
Quarterly Financial Information [Text Block]	Unaudited Quarterly Operating Results (in millions) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenues $ 395 $ 562 $ 820 $ 407 Operating income 40 122 247 37 Net income — 64 164 (2 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenues $ 392 $ 574 $ 819 $ 421 Operating income 52 157 317 37 Net income 10 77 176 (8 )
Sierra Pacific Power Company [Member]
Quarterly Operating Results [Line Items]
Quarterly Financial Information [Text Block]	Unaudited Quarterly Operating Results (in millions) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Regulated electric operating revenue $ 181 $ 169 $ 225 $ 177 Regulated natural gas operating revenue 41 19 14 29 Operating income 47 19 56 30 Net income 34 7 35 16 Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Regulated electric operating revenue $ 159 $ 160 $ 215 $ 179 Regulated natural gas operating revenue 34 17 15 33 Operating income 46 36 75 41 Net income 24 17 44 24

Condensed Financial Statements

Condensed Financial Statements (Notes)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements [Text Block]	Schedule I As of December 31, 2018 2017 ASSETS Current assets: Cash and cash equivalents $ 9 $ 346 Accounts receivable - affiliate 100 60 Notes receivable - affiliate 156 391 Income tax receivable 103 — Other current assets 15 21 Total current assets 383 818 Investments in subsidiaries 36,602 34,019 Other investments 1,579 2,117 Goodwill 1,221 1,221 Other assets 546 1,155 Total assets $ 40,331 $ 39,330 LIABILITIES AND EQUITY Current liabilities: Accounts payable and other current liabilities $ 183 $ 268 Notes payable - affiliate 328 182 Short-term debt 983 3,331 Current portion of BHE senior debt — 1,000 Total current liabilities 1,494 4,781 BHE senior debt 8,577 5,452 BHE junior subordinated debentures 100 100 Notes payable - affiliate 1 1 Other long-term liabilities 543 800 Total liabilities 10,715 11,134 Equity: BHE shareholders' equity: Common stock - 115 shares authorized, no par value, 77 shares issued and outstanding — — Additional paid-in capital 6,371 6,368 Long-term income tax receivable (457 ) — Retained earnings 25,624 22,206 Accumulated other comprehensive loss, net (1,945 ) (398 ) Total BHE shareholders' equity 29,593 28,176 Noncontrolling interest 23 20 Total equity 29,616 28,196 Total liabilities and equity $ 40,331 $ 39,330 The accompanying notes are an integral part of this financial statement schedule. Schedule I BERKSHIRE HATHAWAY ENERGY COMPANY PARENT COMPANY ONLY CONDENSED STATEMENTS OF OPERATIONS (Amounts in millions) Years Ended December 31, 2018 2017 2016 Operating expenses: General and administration $ 21 $ 55 $ 51 Depreciation and amortization 4 4 4 Total operating expenses 25 59 55 Operating loss (25 ) (59 ) (55 ) Other income (expense): Interest expense (438 ) (475 ) (527 ) Other, net (537 ) (369 ) 37 Total other income (expense) (975 ) (844 ) (490 ) Loss before income tax benefit and equity income (1,000 ) (903 ) (545 ) Income tax benefit (513 ) (335 ) (285 ) Equity income 3,058 3,441 2,805 Net income 2,571 2,873 2,545 Net income attributable to noncontrolling interest 3 3 3 Net income attributable to BHE shareholders $ 2,568 $ 2,870 $ 2,542 The accompanying notes are an integral part of this financial statement schedule. Schedule I BERKSHIRE HATHAWAY ENERGY COMPANY PARENT COMPANY ONLY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Amounts in millions) Years Ended December 31, 2018 2017 2016 Net income $ 2,571 $ 2,873 $ 2,545 Other comprehensive income (loss), net of tax (462 ) 1,113 (603 ) Comprehensive income 2,109 3,986 1,942 Comprehensive income attributable to noncontrolling interests 3 3 3 Comprehensive income attributable to BHE shareholders $ 2,106 $ 3,983 $ 1,939 The accompanying notes are an integral part of this financial statement schedule. Schedule I BERKSHIRE HATHAWAY ENERGY COMPANY PARENT COMPANY ONLY CONDENSED STATEMENTS OF CASH FLOWS (In millions) Years Ended December 31, 2018 2017 2016 Cash flows from operating activities $ 1,885 $ 2,450 $ 2,760 Cash flows from investing activities: Investments in subsidiaries (1,791 ) (1,566 ) (1,080 ) Purchases of investments (44 ) (71 ) (24 ) Proceeds from sale of investments 45 68 20 Notes receivable from affiliate, net (72 ) (305 ) (307 ) Other, net (22 ) (8 ) (5 ) Net cash flows from investing activities (1,884 ) (1,882 ) (1,396 ) Cash flows from financing activities: Proceeds from BHE senior debt 3,166 — — Repayments of BHE senior debt (1,045 ) (1,379 ) — Repayments of BHE subordinated debt — (944 ) (2,000 ) Common stock purchases (107 ) (19 ) — Net proceeds from (repayments of) short-term debt (2,348 ) 2,498 581 Tender offer premium paid — (406 ) — Notes payable to affiliate, net — — 69 Other, net (4 ) (5 ) (4 ) Net cash flows from financing activities (338 ) (255 ) (1,354 ) Net change in cash and cash equivalents (337 ) 313 10 Cash and cash equivalents at beginning of year 346 33 23 Cash and cash equivalents at end of year $ 9 $ 346 $ 33 The accompanying notes are an integral part of this financial statement schedule. Schedule I BERKSHIRE HATHAWAY ENERGY COMPANY PARENT COMPANY ONLY NOTES TO CONDENSED FINANCIAL STATEMENTS Basis of Presentation - The condensed financial information of BHE investments in subsidiaries are presented under the equity method of accounting. Under this method, the assets and liabilities of subsidiaries are not consolidated. The investments in subsidiaries are recorded in the Condensed Balance Sheets. The income from operations of subsidiaries is reported on a net basis as equity income in the Condensed Statements of Operations. Other investments - BHE 's investment in BYD Company Limited ("BYD") common stock is accounted for as an available-for-sale security with changes in fair value recognized in AOCI. As of December 31, 2018 and 2017 , the fair value of BHE 's investment in BYD common stock was $1,435 million and $1,961 million , respectively, which resulted in an unrealized gain of $1,203 million and $1,729 million as of December 31, 2018 and 2017 , respectively. Dividends and distributions from subsidiaries - Cash dividends paid to BHE by its subsidiaries for the years ended December 31, 2018 , 2017 and 2016 were $2.3 billion , $3.0 billion and $3.0 billion , respectively. In January and February 2019 , BHE received cash dividends from its subsidiaries totaling $194 million . Guarantees and commitments - BHE has issued guarantees and letters of credit in respect of subsidiary and equity method investments aggregating $297 million and commitments, subject to satisfaction of certain specified conditions, to provide equity contributions in support of renewable tax equity investments totaling $1,383 million . See the notes to the consolidated BHE financial statements in Part II, Item 8 for other disclosures regarding long-term obligations (Notes 8 , 9 and 10 ) and shareholders' equity (Note 16 ).
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements [Text Block]	MIDAMERICAN FUNDING, LLC PARENT COMPANY ONLY NOTES TO CONDENSED FINANCIAL STATEMENTS Incorporated by reference are MidAmerican Funding, LLC and Subsidiaries Consolidated Statements of Changes in Equity for the three years ended December 31, 2018 in Part II, Item 8. Basis of Presentation - The condensed financial information of MidAmerican Funding, LLC's ("MidAmerican Funding's") investments in subsidiaries is presented under the equity method of accounting. Under this method, the assets and liabilities of subsidiaries are not consolidated. The investments in and advances to subsidiaries are recorded on the Condensed Balance Sheets. The income from operations of the subsidiaries is reported on a net basis as equity in undistributed earnings of subsidiary companies on the Condensed Statements of Operations. Payable to Affiliate - MHC, Inc. ("MHC") settles all obligations of MidAmerican Funding including primarily interest costs on, and repayments of, MidAmerican Funding's long-term debt and income taxes. MHC received $2 million in 2018 and paid $130 million and $13 million for the years 2017 and 2016 , respectively, on behalf of MidAmerican Funding. See the notes to the consolidated MidAmerican Funding financial statements in Part II, Item 8 for other disclosures.

Schedule II Consolidated Valuat

Schedule II Consolidated Valuation and Qualifying Accounts (Notes)	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Consolidated Valuation and Qualifying Accounts [Text Block]	Schedule II BERKSHIRE HATHAWAY ENERGY COMPANY CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS FOR THE THREE YEARS ENDED DECEMBER 31, 2018 (Amounts in millions) Column B Column C Column E Balance at Charged Balance Column A Beginning to Acquisition Column D at End Description of Year Income Reserves Deductions of Year Reserves Deducted From Assets To Which They Apply: Reserve for uncollectible accounts receivable: Year ended 2018 $ 40 $ 43 $ — $ (41 ) $ 42 Year ended 2017 33 42 — (35 ) 40 Year ended 2016 31 39 — (37 ) 33 Reserves Not Deducted From Assets (1) : Year ended 2018 $ 13 $ 6 $ — $ (6 ) $ 13 Year ended 2017 13 7 — (7 ) 13 Year ended 2016 13 5 — (5 ) 13 The notes to the consolidated BHE financial statements are an integral part of this financial statement schedule. (1) Reserves not deducted from assets relate primarily to estimated liabilities for losses retained by BHE for workers compensation, public liability and property damage claims.
MidAmerican Funding, LLC and Subsidiaries [Domain]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Consolidated Valuation and Qualifying Accounts [Text Block]	MIDAMERICAN FUNDING, LLC AND SUBSIDIARIES MHC INC. AND SUBSIDIARIES CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS FOR THE THREE YEARS ENDED DECEMBER 31, 2018 (Amounts in millions) Column B Column C Column E Balance at Additions Balance Column A Beginning Charged Column D at End Description of Year to Income Deductions of Year Reserves Deducted From Assets To Which They Apply: Reserve for uncollectible accounts receivable: Year ended 2018 $ 7 $ 8 $ (8 ) $ 7 Year ended 2017 $ 7 $ 8 $ (8 ) $ 7 Year ended 2016 $ 6 $ 7 $ (6 ) $ 7 Reserves Not Deducted From Assets (1) : Year ended 2018 $ 13 $ 6 $ (6 ) $ 13 Year ended 2017 $ 13 $ 7 $ (7 ) $ 13 Year ended 2016 $ 13 $ 5 $ (5 ) $ 13 (1) Reserves not deducted from assets include primarily estimated liabilities for losses retained by MidAmerican Funding and MHC for workers compensation, public liability and property damage claims.
MidAmerican Energy Company [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Consolidated Valuation and Qualifying Accounts [Text Block]	MIDAMERICAN ENERGY COMPANY VALUATION AND QUALIFYING ACCOUNTS FOR THE THREE YEARS ENDED DECEMBER 31, 2018 (Amounts in millions) Column B Column C Column E Balance at Additions Balance Column A Beginning Charged Column D at End Description of Year to Income Deductions of Year Reserves Deducted From Assets To Which They Apply: Reserve for uncollectible accounts receivable: Year ended 2018 $ 7 $ 8 $ (8 ) $ 7 Year ended 2017 $ 7 $ 8 $ (8 ) $ 7 Year ended 2016 $ 6 $ 7 $ (6 ) $ 7 Reserves Not Deducted From Assets (1) : Year ended 2018 $ 13 $ 6 $ (6 ) $ 13 Year ended 2017 $ 13 $ 7 $ (7 ) $ 13 Year ended 2016 $ 13 $ 5 $ (5 ) $ 13 (1) Reserves not deducted from assets include estimated liabilities for losses retained by MidAmerican Energy for workers compensation, public liability and property damage claims.

Discontinued Operations Discont

Discontinued Operations Discontinued Operations	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member] | Unregulated Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Disclosure	deleted

Revenue from Contract with Cust

Revenue from Contract with Customer Revenue from Contract with Customer (Notes)	12 Months Ended
	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The Company uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The following table summarizes the Company's energy products and services revenue by regulated energy and nonregulated energy, with further disaggregation of regulated energy by customer class and line of business, including a reconciliation to the Company's reportable segment information included in Note 21 (in millions): For the Year Ended December 31, 2018 PacifiCorp MidAmerican Funding NV Energy Northern Powergrid BHE Pipeline Group BHE Transmission BHE Renewables BHE and Other (1) Total Customer Revenue: Regulated: Retail Electric $ 4,732 $ 1,915 $ 2,773 $ — $ — $ — $ — $ (1 ) $ 9,419 Retail Gas — 636 101 — — — — — 737 Wholesale 55 411 39 — — — — (4 ) 501 Transmission and 103 56 96 892 — 700 — (1 ) 1,846 Interstate pipeline — — — — 1,232 — — (125 ) 1,107 Other — — 2 — — — — — 2 Total Regulated 4,890 3,018 3,011 892 1,232 700 — (131 ) 13,612 Nonregulated — 14 — 39 — 10 673 624 1,360 Total Customer Revenue 4,890 3,032 3,011 931 1,232 710 673 493 14,972 Other revenue (2) 136 21 28 89 (29 ) — 235 121 601 Total $ 5,026 $ 3,053 $ 3,039 $ 1,020 $ 1,203 $ 710 $ 908 $ 614 $ 15,573 (1) The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations. (2) Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group. Real Estate Services The following table summarizes the Company's real estate services revenue by line of business (in millions): HomeServices Year Ended Ended December 31, 2018 Customer Revenue: Brokerage $ 3,882 Franchise 67 Total Customer Revenue 3,949 Other revenue 265 Total $ 4,214 Contract Assets and Liabilities As of December 31, 2018 and December 31, 2017, there were no material contract assets or contract liabilities recorded on the Consolidated Balance Sheets. For the year ended December 31, 2018, there was no material revenue recognized that was included in the contract liability balance at the beginning of the period or from performance obligations satisfied in previous periods. Remaining Performance Obligations The following table summarizes the Company's revenue it expects to recognize in future periods related to significant unsatisfied remaining performance obligations for fixed contracts with expected durations in excess of one year as of December 31, 2018, by reportable segment (in millions): Performance obligations expected to be satisfied: Less than 12 months More than 12 months Total BHE Pipeline Group $ 842 $ 5,678 $ 6,520
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers MidAmerican Energy uses a single five-step model to identify and recognizes revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The following table summarizes MidAmerican Energy's revenue by line of business and customer class, including a reconciliation to MidAmerican Energy's reportable segment information included in Note 19 , (in millions): For the Year Ended December 31, 2018 Electric Natural Gas Other Total Customer Revenue: Retail: Residential $ 696 $ 421 $ — $ 1,117 Commercial 314 153 — 467 Industrial 758 22 — 780 Natural gas transportation services — 39 — 39 Other retail 147 1 — 148 Total retail 1,915 636 — 2,551 Wholesale 295 116 — 411 Multi-value transmission projects 55 — — 55 Other Customer Revenue — — 11 11 Total Customer Revenue 2,265 752 11 3,028 Other revenue 18 2 1 21 Total operating revenue $ 2,283 $ 754 $ 12 $ 3,049 Contract Assets and Liabilities In the event one of the parties to a contract has performed before the other, MidAmerican Energy would recognize a contract asset or contract liability depending on the relationship between MidAmerican Energy's performance and the customer's payment. As of December 31, 2018 , there were no contract assets or contract liabilities recorded on the Balance Sheets.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers Refer to Note 15 of MidAmerican Energy's Notes to Financial Statements. Additionally, MidAmerican Funding had $4 million of other revenue from contracts with customers for the year ended December 31, 2018 .
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	( 14 ) Revenue from Contracts with Customers The following table summarizes PacifiCorp's revenue by regulated energy, with further disaggregation of regulated energy by customer class, for the year ended December 31 (in millions): 2018 Customer Revenue: Retail: Residential $ 1,737 Commercial 1,513 Industrial 1,172 Other retail 234 Total retail 4,656 Wholesale 55 Transmission 103 Other Customer Revenue 76 Total Customer Revenue 4,890 Other revenue 136 Total operating revenue $ 5,026 Contract Assets and Liabilities In the event one of the parties to a contract has performed before the other, PacifiCorp would recognize a contract asset or contract liability depending on the relationship between PacifiCorp's performance and the customer's payment. As of December 31 , 2018 and December 31 , 2017 , there were no material contract assets or contract liabilities recorded on the Consolidated Balance Sheets. During the years ended December 31 , 2018 and 2017 , there was no material revenue recognized that was included in the contract liability balance at the beginning of the period or from performance obligations satisfied in previous periods.
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	Revenues from Contracts with Customers The following table summarizes Nevada Power's revenue by customer class for the year ended December 31 (in millions): 2018 Customer Revenue: Retail: Residential $ 1,195 Commercial 433 Industrial 425 Other 24 Total fully bundled 2,077 Distribution only service 30 Total retail 2,107 Wholesale, transmission and other 53 Total Customer Revenue 2,160 Other revenue 24 Total revenue $ 2,184 Contract Assets and Liabilities In the event one of the parties to a contract has performed before the other, Nevada Power would recognize a contract asset or contract liability depending on the relationship between Nevada Power's performance and the customer's payment. As of December 31, 2018 and December 31, 2017 , there were no contract assets or contract liabilities recorded on the Consolidated Balance Sheets.
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer [Text Block]	Revenues from Contracts with Customers The following table summarizes Sierra Pacific's revenue by customer class, including a reconciliation to Sierra Pacific's reportable segment information included in Note 16 , for the year ended December 31 (in millions): 2018 Electric Gas Total Customer Revenue: Retail: Residential $ 267 $ 67 $ 334 Commercial 246 25 271 Industrial 177 8 185 Other 6 1 7 Total fully bundled 696 101 797 Distribution only service 4 — 4 Total retail 700 101 801 Wholesale, transmission and other 48 — 48 Total Customer Revenue 748 101 849 Other revenue 4 2 6 Total revenue $ 752 $ 103 $ 855 Contract Assets and Liabilities In the event one of the parties to a contract has performed before the other, Sierra Pacific would recognize a contract asset or contract liability depending on the relationship between Sierra Pacific's performance and the customer's payment. As of December 31, 2018 and December 31, 2017 , there were no contract assets or contract liabilities recorded on the Balance Sheets.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Allowance for Doubtful Accounts [Line Items]
Basis of consolidation and presentation [Policy Text Block]	Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of BHE and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. The Consolidated Statements of Operations include the revenue and expenses of any acquired entities from the date of acquisition. Intercompany accounts and transactions have been eliminated.
Use of estimates in preparation of financial statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; impairment of goodwill; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; fair value of assets acquired and liabilities assumed in business combinations; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements.
Accounting for the effects of certain types of regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation PacifiCorp, MidAmerican Energy, Nevada Power, Sierra Pacific, Northern Natural Gas, Kern River and ALP (the "Regulated Businesses") prepare their financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, the Regulated Businesses defer the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. The Company continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit the Regulated Businesses' ability to recover their costs. The Company believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at the federal, state and provincial levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be recognized in net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI").
Fair value measurement [Policy Text Block]	Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Alternative valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements and debt service obligations for certain of the Company's nonregulated renewable energy projects. Restricted amounts are included in restricted cash and cash equivalents and investments and restricted cash and cash equivalents and investments on the Consolidated Balance Sheets.
Investments [Policy Text Block]	Investments Fixed Maturity Securities The Company's management determines the appropriate classification of investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments and restricted cash and cash equivalents and investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Consolidated Balance Sheets. Available-for-sale investments are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on fixed maturity securities in a trust related to the decommissioning of nuclear generation assets are recorded as a net regulatory liability since the Company expects to recover costs for these activities through regulated rates. Trading investments are carried at fair value with changes in fair value recognized in earnings. Held-to-maturity investments are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. Investment gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired with respect to securities classified as available-for-sale. If the value of a fixed maturity investment declines to below amortized cost and the decline is deemed other than temporary, the amortized cost of the investment is reduced to fair value, with a corresponding charge to earnings. Any resulting impairment loss is recognized in earnings if the Company intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If the Company does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated fixed maturity investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable. Equity Securities Beginning January 1, 2018, investments in equity securities are carried at fair value with changes in fair value recognized in earnings as a component of gains (losses) on marketable securities, net. Prior to January 1, 2018, substantially all of the Company's equity security investments were classified as available-for-sale with changes in fair value recognized in OCI, net of income taxes. All changes in fair value of equity securities in a trust related to the decommissioning of nuclear generation assets are recorded as a net regulatory liability since the Company expects to recover costs for these activities through regulated rates. Equity Method Investments The Company utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when the investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, the Company records the investment at cost and subsequently increases or decreases the carrying value of the investment by the Company's share of the net earnings or losses and OCI of the investee. The Company records dividends or other equity distributions as reductions in the carrying value of the investment. Certain equity investments are presented on the Consolidated Balance Sheets net of related investment tax credits.
Allowance for doubtful accounts [Policy Text Block]	Allowance for Doubtful Accounts Trade receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on the Company's assessment of the collectibility of amounts owed to the Company by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2018 and 2017 , the allowance for doubtful accounts totaled $42 million and $40 million , respectively, and is included in trade receivables, net on the Consolidated Balance Sheets.
Derivatives [Policy Text Block]	Derivatives The Company employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price, interest rate, and foreign currency exchange rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Consolidated Balance Sheets. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or cost of sales on the Consolidated Statements of Operations. For the Company's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For the Company's derivatives not designated as hedging contracts and for which changes in fair value are not recorded as regulatory assets and liabilities, unrealized gains and losses are recognized on the Consolidated Statements of Operations as operating revenue for sales contracts; cost of sales and operating expense for purchase contracts and electricity, natural gas and fuel swap contracts; and other, net for interest rate swap derivatives. For the Company's derivatives designated as hedging contracts, the Company formally assesses, at inception and thereafter, whether the hedging contract is highly effective in offsetting changes in the hedged item. The Company formally documents hedging activity by transaction type and risk management strategy. Changes in the estimated fair value of a derivative contract designated and qualified as a cash flow hedge, to the extent effective, are included on the Consolidated Statements of Changes in Equity as AOCI, net of tax, until the contract settles and the hedged item is recognized in earnings. The Company discontinues hedge accounting prospectively when it has determined that a derivative contract no longer qualifies as an effective hedge, or when it is no longer probable that the hedged forecasted transaction will occur. When hedge accounting is discontinued because the derivative contract no longer qualifies as an effective hedge, future changes in the estimated fair value of the derivative contract are charged to earnings. Gains and losses related to discontinued hedges that were previously recorded in AOCI will remain in AOCI until the contract settles and the hedged item is recognized in earnings, unless it becomes probable that the hedged forecasted transaction will not occur at which time associated deferred amounts in AOCI are immediately recognized in earnings.
Inventories [Policy Text Block]	Inventories Inventories consist mainly of fuel, which includes coal stocks, stored gas and fuel oil, totaling $273 million and $352 million as of December 31, 2018 and 2017 , respectively, and materials and supplies totaling $571 million and $536 million as of December 31, 2018 and 2017 , respectively. The cost of materials and supplies, coal stocks and fuel oil is determined primarily using the average cost method. The cost of stored gas is determined using either the last-in-first-out ("LIFO") method or the lower of average cost or market. With respect to inventories carried at LIFO cost, the replacement cost would be $14 million and $22 million higher as of December 31, 2018 and 2017 , respectively.
Property, plant and equipment, net - general [Policy Text Block]	Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. The Company capitalizes all construction-related materials, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include capitalized interest, including debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable to the Regulated Businesses. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by the Company's various regulatory authorities. Depreciation studies are completed by the Regulated Businesses to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally when the Company retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, is capitalized by the Regulated Businesses as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC") and the Alberta Utilities Commission ("AUC"). After construction is completed, the Company is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
Property, plant and equipment, net - asset retirement obligations [Policy Text Block]	Asset Retirement Obligations The Company recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. The Company's AROs are primarily related to the decommissioning of nuclear generating facilities and obligations associated with its other generating facilities and offshore natural gas pipelines. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. For the Regulated Businesses, the difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
Property, plant and equipment, net - impairment [Policy Text Block]	Impairment The Company evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. The impacts of regulation are considered when evaluating the carrying value of regulated assets.
Goodwill [Policy Text Block]	Goodwill Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. The Company evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, the Company estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. The Company uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, the Company incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2018 , 2017 and 2016 , the Company did not record any material goodwill impairments. The Company records goodwill adjustments for (a) the tax benefit associated with the excess of tax-deductible goodwill over the reported amount of goodwill and (b) changes to the purchase price allocation prior to the end of the measurement period, which is not to exceed one year from the acquisition date.
Revenue recognition [Policy Text Block]	Revenue Recognition Customer Revenue The Company uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The Company records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. In the event one of the parties to a contract has performed before the other, the Company would recognize a contract asset or contract liability depending on the relationship between the Company's performance and the customer's payment. Energy Products and Services A majority of the Company's energy revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. The Company's energy revenue that is nonregulated primarily relates to the Company's renewable energy business. Revenue recognized is equal to what the Company has the right to invoice as it corresponds directly with the value to the customer of the Company's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and 2017 , trade receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $554 million and $665 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued. Real Estate Services The Company's HomeServices reportable segment consists of separate brokerage, mortgage and franchise businesses. Rates charged for brokerage, mortgage and franchise real estate services are established through contractual arrangements that establish the transaction price and the allocation of the price amongst the separate performance obligations. The full-service residential real estate brokerage business has performance obligations to deliver integrated real estate services including brokerage services, title and closing services, property and casualty insurance, home warranties, relocation services, and other home-related services to customers. All performance obligations related to the full-service residential real estate brokerage business are satisfied in less than one year at the point in time when a real estate transaction is closed or when services are provided. Commission revenue from real estate brokerage transactions and related amounts due to agents are recognized when a real estate transaction is closed. Title and escrow closing fee revenue from real estate transactions and related amounts due to the title insurer are recognized at closing. Payments for amounts billed are generally due from the customer at closing. The franchise business operates a network that has performance obligations to provide the right to use certain brand names and other related service marks as well as to provide orientation programs, training and consultation services, advertising programs and other services to its franchisees. The performance obligations related to the franchise business are satisfied over time or when the services are provided. Franchise royalty fees are sales-based variable consideration and are based on a percentage of commissions earned by franchisees on real estate sales, which are recognized when the sale closes. Meetings and training revenue, referral fees, late fees, service fees and franchise termination fees are earned when services have been completed. Payments for amounts billed are generally due from the franchisee within 30 days of billing. Other Revenue Energy Products and Services Other revenue consists primarily of revenue related to power purchase agreements not considered Customer Revenue as they are recognized in accordance with Accounting Standards Codification ("ASC") 815, "Derivatives and Hedging" and ASC 840, "Leases" and certain non tariff-based revenue approved by the regulator that is not considered Customer Revenue within ASC 606, "Revenue from Contracts with Customers." Real Estate Service Other revenue consists primarily of revenue related to the mortgage business. Mortgage fee revenue consists of amounts earned related to application and underwriting fees, and fees on canceled loans. Fees associated with the origination and acquisition of mortgage loans are recognized as earned. These amounts are not considered Customer Revenue as they are recognized in accordance with ASC 815, "Derivatives and Hedging," ASC 825, "Financial Instruments" and ASC 860, "Transfers and Servicing."
Unamortized debt premiums, discounts and financing costs [Policy Text Block]	Unamortized Debt Premiums, Discounts and Debt Issuance Costs Premiums, discounts and debt issuance costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method.
Foreign currency [Policy Text Block]	Foreign Currency The accounts of foreign-based subsidiaries are measured in most instances using the local currency of the subsidiary as the functional currency. Revenue and expenses of these businesses are translated into United States dollars at the average exchange rate for the period. Assets and liabilities are translated at the exchange rate as of the end of the reporting period. Gains or losses from translating the financial statements of foreign-based operations are included in equity as a component of AOCI. Gains or losses arising from transactions denominated in a currency other than the functional currency of the entity that is party to the transaction are included in earnings.
Income taxes [Policy Text Block]	Income Taxes The Company's provision for income taxes has been computed on a stand-alone basis. Berkshire Hathaway includes the Company in its consolidated United States federal and Iowa state income tax returns and substantially all of the Company's United States federal income tax is remitted to or received from Berkshire Hathaway. The Company records the deferred income tax assets associated with the state of Iowa net operating loss carryforward as a long-term income tax receivable from Berkshire Hathaway as a component of BHE's shareholders' equity due to the long-term related-party nature of the income tax receivable. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities associated with income tax benefits and expense for certain property-related basis differences and other various differences that the Company's regulated businesses deems probable to be passed on to their customers in most state and provincial jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions.
Unremitted earnings in foreign investment [Policy Text Block]	The Company has not established deferred income taxes on its undistributed foreign earnings that have been determined by management to be reinvested indefinitely; however, the Company periodically evaluates its capital requirements. If circumstances change in the future and a portion of the Company's undistributed foreign earnings were repatriated, the dividends may be subject to taxation in the United States but the tax is not expected to be material.
Income tax uncertainties [Policy Text Block]	In determining the Company's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by the Company's various regulatory commissions. The Company's income tax returns are subject to continuous examinations by federal, state, local and foreign income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. The Company recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of the Company's federal, state, local and foreign income tax examinations is uncertain, the Company believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on the Company's consolidated financial results. The Company's unrecognized tax benefits are primarily included in accrued property, income and other taxes and other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. The Company elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, which amends FASB ASC Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity's ability to hedge non-financial and financial risk components and reduces complexity in fair value hedges of interest rate risk. In addition, it eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item and also eases certain documentation and assessment requirements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The Company adopted the guidance on January 1, 2019 and it did not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. The Company adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $(8) million and $4 million , respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this guidance retrospectively effective January 1, 2018 which resulted in a decrease to operating cash flows of $15 million and an increase in investing cash flows of $81 million for the year ended December 31, 2017 and an increase in operating cash flows and investing cash flows of $22 million and $36 million , respectively, for the year ended December 31, 2016. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. The Company adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $27 million and $26 million previously recognized within investing cash flows to operating cash flows for the years ended December 31, 2017 and 2016 respectively. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. The Company adopted this guidance effective January 1, 2019, for all contracts currently in-effect. The Company is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $550 million based on the contracts currently in effect and reclassify approximately $525 million of finance lease right of use assets and lease liabilities previously recognized in property, plant and equipment, net and subsidiary debt to other assets and other liabilities, respectively. The Company currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance addressed certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. The Company adopted this guidance effective January 1, 2018 with a cumulative-effect increase to retained earnings of $1,085 million and a corresponding decrease to AOCI. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. The Company adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
PacifiCorp [Member]
Allowance for Doubtful Accounts [Line Items]
Basis of consolidation and presentation [Policy Text Block]	Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of PacifiCorp and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated.
Use of estimates in preparation of financial statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements.
Accounting for the effects of certain types of regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation PacifiCorp prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, PacifiCorp defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in rates occur. PacifiCorp continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit PacifiCorp's ability to recover its costs. PacifiCorp believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future rates, the related regulatory assets and liabilities will be written off to net income or re-established as accumulated other comprehensive income (loss) ("AOCI").
Fair value measurement [Policy Text Block]	Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents consist substantially of funds representing escrow accounts for disputes, vendor retention, custodial and nuclear decommissioning funds. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets.
Investments [Policy Text Block]	Investments Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. As of December 31, 2018 and 2017 , PacifiCorp had no unrealized gains and losses on available-for-sale securities. Trading securities are carried at fair value with realized and unrealized gains and losses recognized in earnings. Equity Method Investments PacifiCorp utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when an investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, PacifiCorp records the investment at cost and subsequently increases or decreases the carrying value of the investment by PacifiCorp's proportionate share of the net earnings or losses and other comprehensive income (loss) ("OCI") of the investee. PacifiCorp records dividends or other equity distributions as reductions in the carrying value of the investment.
Allowance for doubtful accounts [Policy Text Block]	Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on PacifiCorp's assessment of the collectability of amounts owed to PacifiCorp by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 10 $ 7 $ 7 Charged to operating costs and expenses, net 12 15 12 Write-offs, net (14 ) (12 ) (12 ) Ending balance $ 8 $ 10 $ 7
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 10 $ 7 $ 7 Charged to operating costs and expenses, net 12 15 12 Write-offs, net (14 ) (12 ) (12 ) Ending balance $ 8 $ 10 $ 7
Derivatives [Policy Text Block]	Derivatives PacifiCorp employs a number of different derivative contracts, which may include forwards, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or energy costs on the Consolidated Statements of Operations. For PacifiCorp's derivative contracts, the settled amount is generally included in rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in rates are recorded as regulatory liabilities or assets. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings.
Inventories [Policy Text Block]	Inventories Inventories consist mainly of materials, supplies and fuel stocks and are stated at the lower of average cost or net realizable value.
Property, plant and equipment, net - general [Policy Text Block]	Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. PacifiCorp capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs, which include debt and equity allowance for funds used during construction ("AFUDC"). The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Depreciation and amortization are generally computed on the straight-line method based on composite asset class lives prescribed by PacifiCorp's various regulatory authorities or over the assets' estimated useful lives. Depreciation studies are completed periodically to determine the appropriate composite asset class lives, net salvage and depreciation rates. These studies are reviewed and rates are ultimately approved by the various regulatory authorities. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally when PacifiCorp retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of property, plant and equipment, is capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, PacifiCorp is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
Property, plant and equipment, net - asset retirement obligations [Policy Text Block]	Asset Retirement Obligations PacifiCorp recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. PacifiCorp's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
Property, plant and equipment, net - impairment [Policy Text Block]	Impairment PacifiCorp evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. The impacts of regulation are considered when evaluating the carrying value of regulated assets.
Revenue recognition [Policy Text Block]	Revenue Recognition PacifiCorp uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which PacifiCorp expects to be entitled in exchange for those goods or services. PacifiCorp records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. Substantially all of PacifiCorp's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission and distribution and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with ASC 815, "Derivatives and Hedging." Revenue recognized is equal to what PacifiCorp has the right to invoice as it corresponds directly with the value to the customer of PacifiCorp's performance to date and includes billed and unbilled amounts. As of December 31 , 2018 and December 31, 2017 , trade receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $229 million and $255 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued.
Income taxes [Policy Text Block]	Income Taxes Berkshire Hathaway includes PacifiCorp in its consolidated United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that PacifiCorp deems probable to be passed on to its customers in most state jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse or as otherwise approved by PacifiCorp's various regulatory commissions. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions. Investment tax credits are included in other long-term liabilities on the Consolidated Balance Sheets and were $13 million and $16 million as of December 31, 2018 and 2017 , respectively.
Income tax uncertainties [Policy Text Block]	In determining PacifiCorp's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by PacifiCorp's various regulatory commissions. PacifiCorp's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. PacifiCorp recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of PacifiCorp's federal, state and local income tax examinations is uncertain, PacifiCorp believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on PacifiCorp's consolidated financial results. PacifiCorp's unrecognized tax benefits are primarily included in other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
Segment reporting	Segment Information PacifiCorp currently has one segment, which includes its regulated electric utility operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. PacifiCorp elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on PacifiCorp's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. PacifiCorp adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations utilizing the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the year-ended December 31, 2017 and 2016 of $22 million of benefit and $2 million of cost, respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. PacifiCorp adopted this guidance retrospectively January 1, 2018. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. PacifiCorp adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $27 million and $25 million previously recognized within investing cash flows to operating cash flows for the years ended December 31, 2017 and 2016 . In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp adopted this guidance, electing all practical expedients, effective January 1, 2019, for all contracts currently in-effect. PacifiCorp is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. PacifiCorp currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within the Notes to the Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. PacifiCorp adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method. The adoption did not have a cumulative effect impact at the date of initial adoption.
MidAmerican Energy Company [Member]
Allowance for Doubtful Accounts [Line Items]
Use of estimates in preparation of financial statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements.
Accounting for the effects of certain types of regulation [Policy Text Block]	A ccounting for the Effects of Certain Types of Regulation MidAmerican Energy's utility operations are subject to the regulation of the Iowa Utilities Board ("IUB"), the Illinois Commerce Commission ("ICC"), the South Dakota Public Utilities Commission, and the Federal Energy Regulatory Commission ("FERC"). MidAmerican Energy's accounting policies and the accompanying Financial Statements conform to GAAP applicable to rate-regulated enterprises and reflect the effects of the ratemaking process. MidAmerican Energy prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, MidAmerican Energy defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. MidAmerican Energy continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition, that could limit MidAmerican Energy's ability to recover its costs. MidAmerican Energy believes the application of the guidance for regulated operations is appropriate, and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI").
Fair value measurement [Policy Text Block]	Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents and Restricted Cash and Cash Equivalents and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents is comprised of funds restricted for the purpose of constructing solid waste facilities under tax exempt bond agreements. Restricted amounts are included in other current assets and investments and restricted investments on the Balance Sheets.
Investments [Policy Text Block]	Investments Fixed Maturity Securities MidAmerican Energy's management determines the appropriate classification of investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Balance Sheets. Available-for-sale investments are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on fixed maturity securities in a trust related to the decommissioning of the Quad Cities Generating Station Units 1 and 2 ("Quad Cities Station") are recorded as a net regulatory liability because MidAmerican Energy expects to recover costs for these activities through regulated rates. Trading investments are carried at fair value with changes in fair value recognized in earnings. Held-to-maturity securities are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. Investments gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired with respect to securities classified as available-for-sale. If the value of a fixed maturity investment declines to below amortized cost and the decline is deemed other than temporary, the amortized cost of the investment is reduced to fair value, with a corresponding charge to earnings. Any resulting impairment loss is recognized in earnings if MidAmerican Energy intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If MidAmerican Energy does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable.
Allowance for doubtful accounts [Policy Text Block]	Allowance for Doubtful Accounts Receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on MidAmerican Energy's assessment of the collectibility of amounts owed to it by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2018 and 2017 , the allowance for doubtful accounts totaled $7 million and is included in receivables, net on the Balance Sheets.
Derivatives [Policy Text Block]	Derivatives MidAmerican Energy employs a number of different derivative contracts, including forwards, futures, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities, and interest rate risk. Derivative contracts are recorded on the Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Balance Sheets. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked to market, and settled amounts are recognized as operating revenue or cost of sales on the Statements of Operations. For MidAmerican Energy's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities.
Inventories [Policy Text Block]	Inventories Inventories consist mainly of coal stocks, totaling $51 million and $117 million as of December 31, 2018 and 2017 , respectively, materials and supplies, totaling $124 million and $100 million as of December 31, 2018 and 2017 , respectively, and natural gas in storage, totaling $24 million as of December 31, 2018 and 2017 . The cost of materials and supplies, coal stocks and fuel oil is determined using the average cost method. The cost of stored natural gas is determined using the last-in-first-out method. With respect to stored natural gas, the replacement cost would be $14 million and $22 million higher as of December 31, 2018 and 2017 , respectively.
Property, plant and equipment, net - general [Policy Text Block]	Utility Plant, Net General Additions to utility plant are recorded at cost. MidAmerican Energy capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC") and equity AFUDC. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds and retail energy benefits associated with certain wind-powered generation. Amounts expensed under this arrangement are included as a component of depreciation and amortization. Depreciation and amortization for MidAmerican Energy's utility operations are computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by its various regulatory authorities. Depreciation studies are completed by MidAmerican Energy to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced. Generally, when MidAmerican Energy retires or sells a component of utility plant, it charges the original cost, net of any proceeds from the disposition to accumulated depreciation. Any gain or loss on disposals of nonregulated assets is recorded through earnings. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of its regulated facilities, is capitalized by MidAmerican Energy as a component of utility plant, with offsetting credits to the Statements of Operations. AFUDC is computed based on guidelines set forth by the FERC. After construction is completed, MidAmerican Energy is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
Property, plant and equipment, net - asset retirement obligations [Policy Text Block]	Asset Retirement Obligations MidAmerican Energy recognizes AROs when it has a legal obligation to perform decommissioning or removal activities upon retirement of an asset. MidAmerican Energy's AROs are primarily related to decommissioning of the Quad Cities Station and obligations associated with its other generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to utility plant) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in utility plant, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
Property, plant and equipment, net - impairment [Policy Text Block]	Impairment MidAmerican Energy evaluates long-lived assets for impairment, including utility plant, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value. The impacts of regulation are considered when evaluating the carrying value of regulated assets. For all other assets, any resulting impairment loss is reflected on the Statements of Operations.
Revenue recognition [Policy Text Block]	Revenue Recognition MidAmerican Energy uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which MidAmerican Energy expects to be entitled in exchange for those goods and services. MidAmerican Energy records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Statements of Operations. A majority of MidAmerican Energy's energy revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with Accounting Standards Codification ("ASC") 840, "Leases" and amounts not considered Customer Revenue within ASC 606. Revenue from electric and natural gas customers is recognized as electricity or natural gas is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2018 and 2017 , unbilled revenue was $88 million and $89 million , respectively, and is included in receivables, net on the Balance Sheets. The determination of customer billings is based on a systematic reading of customer meters and applicable rates. At the end of each month, amounts of energy provided to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recorded. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns, total volumes supplied to the system, line losses, economic impacts and composition of customer classes. Unbilled revenue is reversed in the following month and billed revenue is recorded based on the subsequent meter readings. All of MidAmerican Energy's regulated retail electric and natural gas sales are subject to energy adjustment clauses. MidAmerican Energy also has costs that are recovered, at least in part, through bill riders, including demand-side management and certain transmission costs. The clauses and riders allow MidAmerican Energy to adjust the amounts charged for electric and natural gas service as the related costs change. The costs recovered in revenue through use of the adjustment clauses and bill riders are charged to expense in the same year the related revenue is recognized. At any given time, these costs may be over or under collected from customers. The total under collection included in receivables at December 31, 2018 and 2017 , was $56 million and $72 million , respectively.
Unamortized debt premiums, discounts and financing costs [Policy Text Block]	Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and issuance costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method.
Income taxes [Policy Text Block]	Income Taxes Berkshire Hathaway includes MidAmerican Funding and MidAmerican Energy in its consolidated United States federal and Iowa state income tax returns. MidAmerican Funding's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that MidAmerican Energy deems probable to be passed on to its customers in most state jurisdictions are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory commissions.
Income tax uncertainties [Policy Text Block]	In determining MidAmerican Funding's and MidAmerican Energy's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by MidAmerican Energy's various regulatory commissions. MidAmerican Funding's and MidAmerican Energy's income tax returns are subject to continuous examinations by federal, state and local tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. MidAmerican Funding and MidAmerican Energy recognize the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of their federal, state and local income tax examinations is uncertain, each company believes it has made adequate provisions for its income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on its consolidated financial results. MidAmerican Funding's and MidAmerican Energy's unrecognized tax benefits are primarily included in taxes accrued and other long-term liabilities on their respective Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy elected to early adopt ASU No. 2018-14 for period ending December 31, 2018. The adoption did not have a material impact on MidAmerican Energy's Financial Statements and disclosures included within Notes to Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. MidAmerican Energy adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, for the years ended December 31, 2017 and 2016, amounts other than the service cost for pension and other postretirement benefit plans totaling $20 million and $15 million , respectively, have been reclassified to Other, net in the Statements of Operations of participating subsidiaries, of which $18 million and $15 million , respectively, relates to MidAmerican Energy. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy adopted this guidance effective January 1, 2019, for all contracts currently in-effect. MidAmerican Energy is finalizing its implementation efforts relative to the new guidance and currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. MidAmerican Energy adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Allowance for Doubtful Accounts [Line Items]
Basis of consolidation and presentation [Policy Text Block]	Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of MidAmerican Funding and its subsidiaries in which it held a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated, other than those between rate-regulated operations.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired when MidAmerican Funding purchased MHC. MidAmerican Funding evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, MidAmerican Funding estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. MidAmerican Funding uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, MidAmerican Funding incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2018 , 2017 and 2016 , MidAmerican Funding did not record any goodwill impairments.
Nevada Power Company [Member]
Allowance for Doubtful Accounts [Line Items]
Basis of consolidation and presentation [Policy Text Block]	Basis of Consolidation and Presentation The Consolidated Financial Statements include the accounts of Nevada Power and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the years ended December 31, 2018 , 2017 and 2016 .
Use of estimates in preparation of financial statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements.
Accounting for the effects of certain types of regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation Nevada Power prepares its Consolidated Financial Statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, Nevada Power defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. Nevada Power continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit Nevada Power 's ability to recover its costs. Nevada Power believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss).
Fair value measurement [Policy Text Block]	Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents and Restricted Cash and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets.
Allowance for doubtful accounts [Policy Text Block]	Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on Nevada Power 's assessment of the collectibility of amounts owed to Nevada Power by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. Nevada Power also has the ability to assess deposits on customers who have delayed payments or who are deemed to be a credit risk. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 16 $ 12 $ 13 Charged to operating costs and expenses, net 15 15 16 Write-offs, net (15 ) (11 ) (17 ) Ending balance $ 16 $ 16 $ 12
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 16 $ 12 $ 13 Charged to operating costs and expenses, net 15 15 16 Write-offs, net (15 ) (11 ) (17 ) Ending balance $ 16 $ 16 $ 12
Derivatives [Policy Text Block]	Derivatives Nevada Power employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked‑to‑market and settled amounts are recognized as cost of fuel, energy and capacity on the Consolidated Statements of Operations. For Nevada Power 's derivative contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings.
Inventories [Policy Text Block]	Inventories Inventories consist mainly of materials and supplies totaling $56 million as of December 31 , 2018 and 2017 , and fuel, which includes coal stock, stored natural gas and fuel oil, totaling $5 million and $3 million as of December 31 , 2018 and 2017 , respectively. The cost is determined using the average cost method. Materials are charged to inventory when purchased and are expensed or capitalized to construction work in process, as appropriate, when used. Fuel costs are recovered from retail customers through the base tariff energy rates and deferred energy accounting adjustment charges approved by the Public Utilities Commission of Nevada ("PUCN").
Property, plant and equipment, net - general [Policy Text Block]	Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. Nevada Power capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. The cost of repairs and minor replacements are charged to expense when incurred with the exception of costs for generation plant maintenance under certain long-term service agreements. Costs under these agreements are expensed straight-line over the term of the agreements as approved by the PUCN. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by Nevada Power 's various regulatory authorities. Depreciation studies are completed by Nevada Power to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as a non-current regulatory liability on the Consolidated Balance Sheets. As actual removal costs are incurred, the associated liability is reduced. Generally when Nevada Power retires or sells a component of regulated property, plant and equipment depreciated using the composite method, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings with the exception of material gains or losses on regulated property, plant and equipment depreciated on a straight-line basis, which is then recorded to a regulatory asset or liability. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, are capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. The rate applied to construction costs is the lower of the PUCN allowed rate of return and rates computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, Nevada Power is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Nevada Power 's AFUDC rate used during 2018 and 2017 was 7.95% and 8.09% , respectively.
Property, plant and equipment, net - asset retirement obligations [Policy Text Block]	Asset Retirement Obligations Nevada Power recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. Nevada Power 's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability on the Consolidated Balance Sheets. The costs are not recovered in rates until the work has been completed.
Property, plant and equipment, net - impairment [Policy Text Block]	Impairment of Long-Lived Assets Nevada Power evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Consolidated Statements of Operations. As substantially all property, plant and equipment was used in regulated businesses as of December 31 , 2018 , the impacts of regulation are considered when evaluating the carrying value of regulated assets.
Revenue recognition [Policy Text Block]	Revenue Recognition Nevada Power uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which Nevada Power expects to be entitled in exchange for those goods or services. Nevada Power records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations. Substantially all of Nevada Power's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission and distribution and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of amounts not considered Customer Revenue within Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers" and revenue recognized in accordance with ASC 840, "Leases". Revenue recognized is equal to what Nevada Power has the right to invoice as it corresponds directly with the value to the customer of Nevada Power's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and December 31, 2017 , accounts receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $106 million and $111 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued.
Unamortized debt premiums, discounts and financing costs [Policy Text Block]	Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing on a straight-line basis.
Income taxes [Policy Text Block]	Income Taxes Berkshire Hathaway includes Nevada Power in its consolidated United States federal income tax return. Consistent with established regulatory practice, Nevada Power 's provision for income taxes has been computed on a separate return basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of other comprehensive income ("OCI") are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property‑related basis differences and other various differences that Nevada Power deems probable to be passed on to its customers are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties.
Income tax uncertainties [Policy Text Block]	In determining Nevada Power 's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by Nevada Power 's various regulatory commissions. Nevada Power 's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. Nevada Power recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of Nevada Power 's federal, state and local income tax examinations is uncertain, Nevada Power believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on Nevada Power 's consolidated financial results. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
Segment reporting	Segment Information Nevada Power currently has one segment, which includes its regulated electric utility operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Nevada Power adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $2 million and $3 million , respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Nevada Power adopted this guidance effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Nevada Power adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power adopted this guidance effective January 1, 2019, for all contracts currently in effect. Nevada Power is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. Nevada Power currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Nevada Power adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
Sierra Pacific Power Company [Member]
Allowance for Doubtful Accounts [Line Items]
Basis of consolidation and presentation [Policy Text Block]	Basis of Presentation The Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the years ended December 31, 2018 , 2017 and 2016 .
Use of estimates in preparation of financial statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; recovery of long-lived assets; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements.
Accounting for the effects of certain types of regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation Sierra Pacific prepares its Financial Statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, Sierra Pacific defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur. Sierra Pacific continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit Sierra Pacific 's ability to recover its costs. Sierra Pacific believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss).
Fair value measurement [Policy Text Block]	Fair Value Measurements As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash equivalent and restricted cash and investments [Policy Text Block]	Cash Equivalents and Restricted Cash and Investments Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Balance Sheets.
Allowance for doubtful accounts [Policy Text Block]	Allowance for Doubtful Accounts Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on Sierra Pacific 's assessment of the collectibility of amounts owed to Sierra Pacific by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. Sierra Pacific also has the ability to assess deposits on customers who have delayed payments or who are deemed to be a credit risk. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 2 $ 2 $ 1 Charged to operating costs and expenses, net 1 2 2 Write-offs, net (1 ) (2 ) (1 ) Ending balance $ 2 $ 2 $ 2
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 2 $ 2 $ 1 Charged to operating costs and expenses, net 1 2 2 Write-offs, net (1 ) (2 ) (1 ) Ending balance $ 2 $ 2 $ 2
Derivatives [Policy Text Block]	Derivatives Sierra Pacific employs a number of different derivative contracts, which may include forwards, futures, options, swaps and other agreements, to manage its commodity price and interest rate risk. Derivative contracts are recorded on the Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked‑to‑market and settled amounts are recognized as cost of fuel, energy and capacity or natural gas purchased for resale on the Statements of Operations. For Sierra Pacific 's derivative contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings.
Inventories [Policy Text Block]	Inventories Inventories consist mainly of materials and supplies totaling $44 million and $42 million as of December 31 , 2018 and 2017 , respectively, and fuel, which includes coal stock, stored natural gas and fuel oil, totaling $8 million and $7 million as of December 31 , 2018 and 2017 , respectively. The cost is determined using the average cost method. Materials are charged to inventory when purchased and are expensed or capitalized to construction work in process, as appropriate, when used. Fuel costs are recovered from retail customers through the base tariff energy rates and deferred energy accounting adjustment charges approved by the Public Utilities Commission of Nevada ("PUCN").
Property, plant and equipment, net - general [Policy Text Block]	Property, Plant and Equipment, Net General Additions to property, plant and equipment are recorded at cost. Sierra Pacific capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC"), and equity AFUDC, as applicable. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. The cost of repairs and minor replacements are charged to expense when incurred with the exception of costs for generation plant maintenance under certain long-term service agreements. Costs under these agreements are expensed straight-line over the term of the agreements as approved by the PUCN. Depreciation and amortization are generally computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by Sierra Pacific 's various regulatory authorities. Depreciation studies are completed by Sierra Pacific to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as a non-current regulatory liability on the Balance Sheets. As actual removal costs are incurred, the associated liability is reduced. Generally when Sierra Pacific retires or sells a component of regulated property, plant and equipment depreciated using the composite method, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings with the exception of material gains or losses on regulated property, plant and equipment depreciated on a straight-line basis, which is then recorded to a regulatory asset or liability. Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of regulated facilities, are capitalized as a component of property, plant and equipment, with offsetting credits to the Statements of Operations. The rate applied to construction costs is the lower of the PUCN allowed rate of return and rates computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, Sierra Pacific is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets. Sierra Pacific 's AFUDC rate used during 2018 and 2017 was 6.65% for electric, 5.74% and 5.63% for natural gas, respectively, and 6.55% for common facilities.
Property, plant and equipment, net - asset retirement obligations [Policy Text Block]	Asset Retirement Obligations Sierra Pacific recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. Sierra Pacific 's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability on the Balance Sheets. The costs are not recovered in rates until the work has been completed.
Property, plant and equipment, net - impairment [Policy Text Block]	Impairment of Long-Lived Assets Sierra Pacific evaluates long-lived assets for impairment, including property, plant and equipment, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value and any resulting impairment loss is reflected on the Statements of Operations. As substantially all property, plant and equipment was used in regulated businesses as of December 31 , 2018 , the impacts of regulation are considered when evaluating the carrying value of regulated assets.
Revenue recognition [Policy Text Block]	Revenue Recognition Sierra Pacific uses a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue") upon transfer of control of promised goods or services in an amount that reflects the consideration to which Sierra Pacific expects to be entitled in exchange for those goods or services. Sierra Pacific records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Statements of Operations. Substantially all of Sierra Pacific's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory commissions. These tariff-based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Other revenue consists primarily of revenue recognized in accordance with ASC 840, "Leases" and amounts not considered Customer Revenue within Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers". Revenue recognized is equal to what Sierra Pacific has the right to invoice as it corresponds directly with the value to the customer of Sierra Pacific's performance to date and includes billed and unbilled amounts. As of December 31, 2018 and December 31, 2017 , accounts receivables, net on the Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $57 million and $62 million , respectively. Payments for amounts billed are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued.
Unamortized debt premiums, discounts and financing costs [Policy Text Block]	Unamortized Debt Premiums, Discounts and Issuance Costs Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing on a straight-line basis.
Income taxes [Policy Text Block]	Income Taxes Berkshire Hathaway includes Sierra Pacific in its consolidated United States federal income tax return. Consistent with established regulatory practice, Sierra Pacific 's provision for income taxes has been computed on a separate return basis. Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of other comprehensive income ("OCI") are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with certain property-related basis differences and other various differences that Sierra Pacific deems probable to be passed on to its customers are charged or credited directly to a regulatory asset or liability and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more-likely-than-not to be realized. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties.
Income tax uncertainties [Policy Text Block]	In determining Sierra Pacific 's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by Sierra Pacific 's various regulatory commissions. Sierra Pacific 's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. Sierra Pacific recognizes the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of Sierra Pacific 's federal, state and local income tax examinations is uncertain, Sierra Pacific believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on Sierra Pacific 's financial results. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Statements of Operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Sierra Pacific adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $1 million and $(1) million , respectively, have been reclassified to Other, net in the Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Sierra Pacific adopted this guidance effective January 1, 2018 which did not have a material impact on its Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Sierra Pacific adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific adopted this guidance effective January 1, 2019, for all contracts currently in effect. Sierra Pacific is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $20 million based on the contracts currently in-effect. Sierra Pacific currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Sierra Pacific adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. The Company elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, which amends FASB ASC Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity's ability to hedge non-financial and financial risk components and reduces complexity in fair value hedges of interest rate risk. In addition, it eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item and also eases certain documentation and assessment requirements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The Company adopted the guidance on January 1, 2019 and it did not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. The Company adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $(8) million and $4 million , respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this guidance retrospectively effective January 1, 2018 which resulted in a decrease to operating cash flows of $15 million and an increase in investing cash flows of $81 million for the year ended December 31, 2017 and an increase in operating cash flows and investing cash flows of $22 million and $36 million , respectively, for the year ended December 31, 2016. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. The Company adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $27 million and $26 million previously recognized within investing cash flows to operating cash flows for the years ended December 31, 2017 and 2016 respectively. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. The Company adopted this guidance effective January 1, 2019, for all contracts currently in-effect. The Company is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $550 million based on the contracts currently in effect and reclassify approximately $525 million of finance lease right of use assets and lease liabilities previously recognized in property, plant and equipment, net and subsidiary debt to other assets and other liabilities, respectively. The Company currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance addressed certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. The Company adopted this guidance effective January 1, 2018 with a cumulative-effect increase to retained earnings of $1,085 million and a corresponding decrease to AOCI. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. The Company adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
PacifiCorp [Member]
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. PacifiCorp elected to early adopt ASU No. 2018-14 effective December 31, 2018. The adoption did not have a material impact on PacifiCorp's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. PacifiCorp adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations utilizing the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the year-ended December 31, 2017 and 2016 of $22 million of benefit and $2 million of cost, respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. PacifiCorp adopted this guidance retrospectively January 1, 2018. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. PacifiCorp adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $27 million and $25 million previously recognized within investing cash flows to operating cash flows for the years ended December 31, 2017 and 2016 . In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp adopted this guidance, electing all practical expedients, effective January 1, 2019, for all contracts currently in-effect. PacifiCorp is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. PacifiCorp currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within the Notes to the Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. PacifiCorp adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method. The adoption did not have a cumulative effect impact at the date of initial adoption.
Allowance for Doubtful Accounts [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility Plant: Generation 14 - 67 years $ 12,606 $ 12,490 Transmission 58 - 75 years 6,357 6,226 Distribution 20 - 70 years 7,030 6,792 Intangible plant (1) 5 - 75 years 970 937 Other 5 - 60 years 1,483 1,435 Utility plant in service 28,446 27,880 Accumulated depreciation and amortization (10,060 ) (9,366 ) Utility plant in service, net 18,386 18,514 Other non-regulated, net of accumulated depreciation and amortization 47 years 10 11 Plant, net 18,396 18,525 Construction work-in-progress 1,195 678 Property, plant and equipment, net $ 19,591 $ 19,203 (1) Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 10 $ 7 $ 7 Charged to operating costs and expenses, net 12 15 12 Write-offs, net (14 ) (12 ) (12 ) Ending balance $ 8 $ 10 $ 7
MidAmerican Energy Company [Member]
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods ending after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy elected to early adopt ASU No. 2018-14 for period ending December 31, 2018. The adoption did not have a material impact on MidAmerican Energy's Financial Statements and disclosures included within Notes to Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. MidAmerican Energy adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, for the years ended December 31, 2017 and 2016, amounts other than the service cost for pension and other postretirement benefit plans totaling $20 million and $15 million , respectively, have been reclassified to Other, net in the Statements of Operations of participating subsidiaries, of which $18 million and $15 million , respectively, relates to MidAmerican Energy. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy adopted this guidance effective January 1, 2019, for all contracts currently in-effect. MidAmerican Energy is finalizing its implementation efforts relative to the new guidance and currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. MidAmerican Energy adopted this guidance effective January 1, 2018, and the adoption did not have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. MidAmerican Energy adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
Allowance for Doubtful Accounts [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant in service: Generation 20-70 years $ 13,727 $ 12,107 Transmission 52-75 years 1,934 1,838 Electric distribution 20-75 years 3,672 3,380 Natural gas distribution 29-75 years 1,726 1,640 Utility plant in service 21,059 18,965 Accumulated depreciation and amortization (5,941 ) (5,561 ) Utility plant in service, net 15,118 13,404 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 15,124 13,410 Construction work-in-progress 1,035 797 Property, plant and equipment, net $ 16,159 $ 14,207
Nevada Power Company [Member]
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Nevada Power adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $2 million and $3 million , respectively, have been reclassified to Other, net in the Consolidated Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Nevada Power adopted this guidance effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Nevada Power adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power adopted this guidance effective January 1, 2019, for all contracts currently in effect. Nevada Power is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $15 million based on the contracts currently in-effect. Nevada Power currently does not believe the adoption of the new guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Nevada Power adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
Allowance for Doubtful Accounts [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Generation 30 - 55 years $ 3,720 $ 3,707 Distribution 20 - 65 years 3,411 3,314 Transmission 45 - 70 years 1,867 1,860 General and intangible plant 5 - 65 years 848 793 Utility plant 9,846 9,674 Accumulated depreciation and amortization (3,076 ) (2,871 ) Utility plant, net 6,770 6,803 Other non-regulated, net of accumulated depreciation and amortization 45 years 1 1 Plant, net 6,771 6,804 Construction work-in-progress 97 73 Property, plant and equipment, net $ 6,868 $ 6,877
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 16 $ 12 $ 13 Charged to operating costs and expenses, net 15 15 16 Write-offs, net (15 ) (11 ) (17 ) Ending balance $ 16 $ 16 $ 12
Sierra Pacific Power Company [Member]
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. Sierra Pacific adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the years ended December 31, 2017 and 2016 of $1 million and $(1) million , respectively, have been reclassified to Other, net in the Statements of Operations. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Sierra Pacific adopted this guidance effective January 1, 2018 which did not have a material impact on its Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. Sierra Pacific adopted this guidance retrospectively effective January 1, 2018 which did not have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases," ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption and ASU No. 2018-20 that provides targeted improvements to lessor accounting, such as the handling of sales and other similar taxes. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific adopted this guidance effective January 1, 2019, for all contracts currently in effect. Sierra Pacific is finalizing its implementation efforts relative to the new guidance and currently expects to recognize operating lease right of use assets and lease liabilities of approximately $20 million based on the contracts currently in-effect. Sierra Pacific currently does not believe the adoption of the new guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize Customer Revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Sierra Pacific adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.
Allowance for Doubtful Accounts [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Electric generation 25 - 60 years $ 1,144 $ 1,144 Electric distribution 20 - 100 years 1,568 1,459 Electric transmission 50 - 100 years 835 786 Electric general and intangible plant 5 - 70 years 197 181 Natural gas distribution 35 - 70 years 403 390 Natural gas general and intangible plant 5 - 70 years 14 14 Common general 5 - 70 years 321 294 Utility plant 4,482 4,268 Accumulated depreciation and amortization (1,593 ) (1,513 ) Utility plant, net 2,889 2,755 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,894 2,760 Construction work-in-progress 90 132 Property, plant and equipment, net $ 2,984 $ 2,892
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Balance Sheets, is summarized as follows for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 2 $ 2 $ 1 Charged to operating costs and expenses, net 1 2 2 Write-offs, net (1 ) (2 ) (1 ) Ending balance $ 2 $ 2 $ 2

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 77,288 $ 74,660 Interstate natural gas pipeline assets 3-80 years 7,524 7,176 84,812 81,836 Accumulated depreciation and amortization (26,010 ) (24,478 ) Regulated assets, net 58,802 57,358 Nonregulated assets: Independent power plants 5-30 years 6,826 6,010 Other assets 3-30 years 1,498 1,489 8,324 7,499 Accumulated depreciation and amortization (1,641 ) (1,542 ) Nonregulated assets, net 6,683 5,957 Net operating assets 65,485 63,315 Construction work-in-progress 3,110 2,556 Property, plant and equipment, net $ 68,595 $ 65,871
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant in service: Generation 20-70 years $ 13,727 $ 12,107 Transmission 52-75 years 1,934 1,838 Electric distribution 20-75 years 3,672 3,380 Natural gas distribution 29-75 years 1,726 1,640 Utility plant in service 21,059 18,965 Accumulated depreciation and amortization (5,941 ) (5,561 ) Utility plant in service, net 15,118 13,404 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 15,124 13,410 Construction work-in-progress 1,035 797 Property, plant and equipment, net $ 16,159 $ 14,207
Depreciation and Amortization Rates [Table Text Block]	The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows: 2018 2017 2016 Electric 2.9 % 2.6 % 2.8 % Natural gas 2.8 % 2.7 % 2.9 %
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility Plant: Generation 14 - 67 years $ 12,606 $ 12,490 Transmission 58 - 75 years 6,357 6,226 Distribution 20 - 70 years 7,030 6,792 Intangible plant (1) 5 - 75 years 970 937 Other 5 - 60 years 1,483 1,435 Utility plant in service 28,446 27,880 Accumulated depreciation and amortization (10,060 ) (9,366 ) Utility plant in service, net 18,386 18,514 Other non-regulated, net of accumulated depreciation and amortization 47 years 10 11 Plant, net 18,396 18,525 Construction work-in-progress 1,195 678 Property, plant and equipment, net $ 19,591 $ 19,203 (1) Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Generation 30 - 55 years $ 3,720 $ 3,707 Distribution 20 - 65 years 3,411 3,314 Transmission 45 - 70 years 1,867 1,860 General and intangible plant 5 - 65 years 848 793 Utility plant 9,846 9,674 Accumulated depreciation and amortization (3,076 ) (2,871 ) Utility plant, net 6,770 6,803 Other non-regulated, net of accumulated depreciation and amortization 45 years 1 1 Plant, net 6,771 6,804 Construction work-in-progress 97 73 Property, plant and equipment, net $ 6,868 $ 6,877
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions): Depreciable Life 2018 2017 Utility plant: Electric generation 25 - 60 years $ 1,144 $ 1,144 Electric distribution 20 - 100 years 1,568 1,459 Electric transmission 50 - 100 years 835 786 Electric general and intangible plant 5 - 70 years 197 181 Natural gas distribution 35 - 70 years 403 390 Natural gas general and intangible plant 5 - 70 years 14 14 Common general 5 - 70 years 321 294 Utility plant 4,482 4,268 Accumulated depreciation and amortization (1,593 ) (1,513 ) Utility plant, net 2,889 2,755 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,894 2,760 Construction work-in-progress 90 132 Property, plant and equipment, net $ 2,984 $ 2,892

Jointly Owned Utility Facilit_2

Jointly Owned Utility Facilities (Tables)	12 Months Ended
	Dec. 31, 2018
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Table Text Block]	The amounts shown in the table below represent the Company's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Accumulated Construction Company Facility In Depreciation and Work-in- Share Service Amortization Progress PacifiCorp: Jim Bridger Nos. 1-4 67 % $ 1,458 $ 647 $ 11 Hunter No. 1 94 484 182 — Hunter No. 2 60 298 121 5 Wyodak 80 471 229 — Colstrip Nos. 3 and 4 10 248 137 6 Hermiston 50 180 87 1 Craig Nos. 1 and 2 19 367 241 — Hayden No. 1 25 74 37 — Hayden No. 2 13 43 22 — Foote Creek 79 40 27 1 Transmission and distribution facilities Various 808 246 76 Total PacifiCorp 4,471 1,976 100 MidAmerican Energy: Louisa No. 1 88 % 822 443 8 Quad Cities Nos. 1 and 2 (1) 25 723 407 10 Walter Scott, Jr. No. 3 79 641 304 2 Walter Scott, Jr. No. 4 (2) 60 454 167 1 George Neal No. 4 41 310 164 2 Ottumwa No. 1 52 630 209 6 George Neal No. 3 72 442 196 3 Transmission facilities Various 257 92 — Total MidAmerican Energy 4,279 1,982 32 NV Energy: Navajo 11 % 223 176 — Valmy 50 389 252 1 Transmission facilities Various 226 49 1 Total NV Energy 838 477 2 BHE Pipeline Group - common facilities Various 286 173 — Total $ 9,874 $ 4,608 $ 134 (1) Includes amounts related to nuclear fuel. (2) Facility in-service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million , respectively.
PacifiCorp [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Table Text Block]	The amounts shown in the table below represent PacifiCorp's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Facility Accumulated Construction PacifiCorp in Depreciation and Work-in- Share Service Amortization Progress Jim Bridger Nos. 1 - 4 67 % $ 1,458 $ 647 $ 11 Hunter No. 1 94 484 182 — Hunter No. 2 60 298 121 5 Wyodak 80 471 229 — Colstrip Nos. 3 and 4 10 248 137 6 Hermiston 50 180 87 1 Craig Nos. 1 and 2 19 367 241 — Hayden No. 1 25 74 37 — Hayden No. 2 13 43 22 — Foote Creek 79 40 27 1 Transmission and distribution facilities Various 808 246 76 Total $ 4,471 $ 1,976 $ 100
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Table Text Block]	The amounts shown in the table below represent MidAmerican Energy's share in each jointly owned facility included in property, plant and equipment, net as of December 31, 2018 (dollars in millions): Accumulated Construction Company Plant in Depreciation and Work-in- Share Service Amortization Progress Louisa Unit No. 1 88 % $ 822 $ 443 $ 8 Quad Cities Unit Nos. 1 & 2 (1) 25 723 407 10 Walter Scott, Jr. Unit No. 3 79 641 304 2 Walter Scott, Jr. Unit No. 4 (2) 60 454 167 1 George Neal Unit No. 4 41 310 164 2 Ottumwa Unit No. 1 52 630 209 6 George Neal Unit No. 3 72 442 196 3 Transmission facilities Various 257 92 — Total $ 4,279 $ 1,982 $ 32 (1) Includes amounts related to nuclear fuel. (2) Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million , respectively.
Nevada Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Table Text Block]	The amounts shown in the table below represent Nevada Power 's share in each jointly owned facility included in property, plant and equipment, net as of December 31 , 2018 (dollars in millions): Nevada Construction Power's Utility Accumulated Work-in- Share Plant Depreciation Progress Navajo Generating Station 11 % $ 223 $ 176 $ — ON Line Transmission Line 24 147 19 1 Other transmission facilities Various 67 27 — Total $ 437 $ 222 $ 1
Sierra Pacific Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities [Table Text Block]	The amounts shown in the table below represent Sierra Pacific 's share in each jointly owned facility included in property, plant and equipment, net as of December 31 , 2018 (dollars in millions): Sierra Construction Pacific's Utility Accumulated Work-in- Share Plant Depreciation Progress Valmy Generating Station 50 % $ 389 $ 252 $ 1 ON Line Transmission Line 1 8 1 — Valmy Transmission 50 4 2 — Total $ 401 $ 255 $ 1

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future regulated rates. The Company's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 16 years $ 773 $ 675 Asset retirement obligations 17 years 375 334 Asset disposition costs Various 358 387 Deferred income taxes (2) Various 196 143 Deferred operating costs 10 years 141 147 Abandoned projects 2 years 134 156 Unrealized loss on regulated derivative contracts 2 years 120 122 Deferred net power costs 2 years 103 58 Unamortized contract values 5 years 79 89 Other Various 788 839 Total regulatory assets $ 3,067 $ 2,950 Reflected as: Current assets $ 171 $ 189 Noncurrent assets 2,896 2,761 Total regulatory assets $ 3,067 $ 2,950 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. (2) Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.
Regulatory Liabilities [Table Text Block]	Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. The Company's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) Various $ 3,923 $ 4,143 Cost of removal (2) 28 years 2,426 2,349 Levelized depreciation 30 years 329 332 Asset retirement obligations 34 years 163 177 Impact fees 4 years 88 89 Other Various 577 421 Total regulatory liabilities $ 7,506 $ 7,511 Reflected as: Current liabilities $ 160 $ 202 Noncurrent liabilities 7,346 7,309 Total regulatory liabilities $ 7,506 $ 7,511 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 20 years $ 448 $ 418 Utah mine disposition (2) Various 136 156 Unamortized contract values 5 years 79 89 Deferred net power costs 3 year 62 21 Unrealized loss on derivative contracts 2 years 96 101 Asset retirement obligation 31 years 119 100 Other Various 172 176 Total regulatory assets $ 1,112 $ 1,061 Reflected as: Current assets $ 36 $ 31 Noncurrent assets 1,076 1,030 Total regulatory assets $ 1,112 $ 1,061 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized. (2) Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recove
Regulatory Liabilities [Table Text Block]	es Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Cost of removal (1) 26 years $ 994 $ 955 Deferred income taxes (2) Various 1,803 1,960 Other Various 258 156 Total regulatory liabilities $ 3,055 $ 3,071 Reflected as: Current liabilities $ 77 $ 75 Noncurrent liabilities 2,978 2,996 Total regulatory liabilities $ 3,055 $ 3,071 (1) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying c
MidAmerican Energy Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions): Average Remaining Life 2018 2017 Asset retirement obligations (1) 12 years $ 160 $ 133 Employee benefit plans (2) 14 years 62 38 Unrealized loss on regulated derivative contracts 1 year 19 6 Other Various 32 27 Total $ 273 $ 204 (1) Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 11 for a discussion of asset retirement obligations. (2) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. Mi
Regulatory Liabilities [Table Text Block]	latory liabilities represent income to be recognized or amounts to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions): Average Remaining Life 2018 2017 Cost of removal accrual (1) 29 years $ 708 $ 688 Deferred income taxes (2) 29 years 626 681 Asset retirement obligations (3) 34 years 160 173 Employee benefit plans (4) N/A — 41 Pre-funded AFUDC on transmission MVPs (5) 54 years 36 35 Iowa electric revenue sharing accrual (6) 1 year 70 26 Other Various 20 17 Total $ 1,620 $ 1,661 (1) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost. (2) Amounts primarily represent income tax liabilities primarily related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 9 for further discussion of 2017 Tax Reform impacts. (3) Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations. (4) Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized. (5) Represents AFUDC accrued on transmission MVPs that is deducted from rate base as a result of the inclusion of related construction work-in-progress in rate base. (6) Represents current-year accruals under a regulatory arrangement in Iowa in which equity returns exceeding specified thresholds reduce utility plant upon final determination.
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future rates. Nevada Power 's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Decommissioning costs (2) 5 years $ 222 $ 231 Deferred operating costs 10 years 152 169 Merger costs from 1999 merger 26 years 125 130 Employee benefit plans (1) 8 years 105 89 Asset retirement obligations 7 years 68 72 Abandoned projects 2 years 46 58 Legacy meters 14 years 53 56 ON Line deferrals 35 years 46 47 Deferred energy costs 1 year 47 46 Other Various 53 71 Total regulatory assets $ 917 $ 969 Reflected as: Current assets $ 39 $ 28 Other assets 878 941 Total regulatory assets $ 917 $ 969 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized. (2) Amount includes regulatory assets with an indeterminate life of $81 million as of December 31 , 2018 .
Regulatory Liabilities [Table Text Block]	Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Nevada Power 's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) 27 years $ 677 $ 670 Cost of removal (2) 33 years 320 307 Impact fees (3) 4 years 86 89 Energy efficiency program 1 year 24 27 Other Various 79 28 Total regulatory liabilities $ 1,186 $ 1,121 Reflected as: Current liabilities $ 49 $ 91 Other long-term liabilities 1,137 1,030 Total regulatory liabilities $ 1,186 $ 1,121 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31 , 2018 . See Note 9 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. (3) Amounts reduce rate base or otherwise accrue a carrying cost.
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future rates. Sierra Pacific 's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Employee benefit plans (1) 8 years $ 132 $ 110 Merger costs from 1999 merger 28 years 74 77 Abandoned projects 7 years 29 34 Renewable energy programs 1 year 4 23 Losses on reacquired debt 16 years 19 21 Other Various 63 67 Total regulatory assets $ 321 $ 332 Reflected as: Current assets $ 7 $ 32 Other assets 314 300 Total regulatory assets $ 321 $ 332 (1) Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.
Regulatory Liabilities [Table Text Block]	Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Sierra Pacific 's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions): Weighted Average Remaining Life 2018 2017 Deferred income taxes (1) 28 years $ 270 $ 264 Cost of removal (2) 40 years 210 211 Deferred energy costs 1 year — 8 Other Various 29 17 Total regulatory liabilities $ 509 $ 500 Reflected as: Current liabilities $ 18 $ 19 Other long-term liabilities 491 481 Total regulatory liabilities $ 509 $ 500 (1) Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $21 million and $- million as of December 31 , 2018 and 2017 , respectively. See Note 9 for further discussion of 2017 Tax Reform impacts. (2) Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

Investments and Restricted Ca_2

Investments and Restricted Cash and Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and Restricted Cash and Investments [Table Text Block]	Investments and restricted cash and cash equivalents and investments consists of the following as of December 31 (in millions): 2018 2017 Investments: BYD Company Limited common stock $ 1,435 $ 1,961 Rabbi trusts 371 441 Other 168 124 Total investments 1,974 2,526 Equity method investments: BHE Renewables tax equity investments 1,661 1,025 Electric Transmission Texas, LLC 527 524 Bridger Coal Company 99 137 Other 153 148 Total equity method investments 2,440 1,834 Restricted cash and cash equivalents and investments: Quad Cities Station nuclear decommissioning trust funds 504 515 Restricted cash and cash equivalents 256 348 Total restricted cash and cash equivalents and investments 760 863 Total investments and restricted cash and cash equivalents and investments $ 5,174 $ 5,223 Reflected as: Other current assets $ 271 $ 351 Noncurrent assets 4,903 4,872 Total investments and restricted cash and cash equivalents and investments $ 5,174 $ 5,223
MidAmerican Energy Company [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and Restricted Cash and Investments [Table Text Block]	Investments and restricted investments consists of the following amounts as of December 31 (in millions): 2018 2017 Nuclear decommissioning trust $ 504 $ 515 Rabbi trusts 191 198 Other 13 15 Total $ 708 $ 728

Short-Term Debt and Credit Fa_2

Short-Term Debt and Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2018
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-Term Debt and Credit Facilities The following table summarizes BHE's and its subsidiaries' availability under their credit facilities as of December 31 (in millions): MidAmerican NV Northern BHE PacifiCorp Funding Energy Powergrid AltaLink Other Total (1) 2018: Credit facilities (2) $ 3,500 $ 1,200 $ 1,309 $ 650 $ 231 $ 639 $ 1,585 $ 9,114 Less: Short-term debt (983 ) (30 ) (240 ) — (77 ) (345 ) (841 ) (2,516 ) Tax-exempt bond support and letters of credit — (89 ) (370 ) (80 ) — (4 ) — (543 ) Net credit facilities $ 2,517 $ 1,081 $ 699 $ 570 $ 154 $ 290 $ 744 $ 6,055 2017: Credit facilities $ 3,600 $ 1,000 $ 909 $ 650 $ 203 $ 1,054 $ 1,635 $ 9,051 Less: Short-term debt (3,331 ) (80 ) — — — (345 ) (732 ) (4,488 ) Tax-exempt bond support and letters of credit (7 ) (130 ) (370 ) (80 ) — (7 ) — (594 ) Net credit facilities $ 262 $ 790 $ 539 $ 570 $ 203 $ 702 $ 903 $ 3,969 (1) The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method. (2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid. As of December 31, 2018 , the Company was in compliance with the covenants of its credit facilities and letter of credit arrangements. BHE BHE has a $3.5 billion unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. This credit facility, which is for general corporate purposes and also supports BHE's commercial paper program and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at BHE's option, plus a spread that varies based on BHE's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.76% and 1.74% , respectively. This credit facility requires that BHE's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.70 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , BHE had $115 million and $96 million , respectively, of letters of credit outstanding, of which $- million and $7 million as of December 31, 2018 and 2017 , respectively, were issued under the credit facility. These letters of credit primarily support power purchase agreements and debt service requirements at certain subsidiaries of BHE Renewables, LLC expiring through January 2020 and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date. PacifiCorp PacifiCorp has a $600 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent and a $600 million unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have variable interest rates based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.85% and 1.83% , respectively. These credit facilities require that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , PacifiCorp had $184 million and $230 million , respectively, of fully available letters of credit issued under committed arrangements. As of December 31, 2018 and 2017 , $170 million and $216 million , respectively, of these letters of credit support PacifiCorp's variable-rate tax-exempt bond obligations and expire in March 2019 and $14 million support certain transactions required by third parties and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date. MidAmerican Funding MidAmerican Energy has a $900 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. As of December 31, 2018, MidAmerican Energy had a $400 million unsecured credit facility expiring November 2019, which it terminated in January 2019. As of December 31, 2018 , the weighted average interest rate on commercial paper borrowings outstanding was 2.49% . The credit facility requires that MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. NV Energy Nevada Power has a $400 million secured credit facility expiring in June 2021 and Sierra Pacific has a $250 million secured credit facility expiring in June 2021 each w ith a one-year extension option subject to lender consent. These credit facilities, which are for general corporate purposes and provide for the issuance of letters of credit, have a variable interest rate based on the Eurodollar rate or a base rate, at each of the Nevada Utilities' option, plus a spread that varies based on each of the Nevada Utilities' credit ratings for its senior secured long‑term debt securities. Amounts due under each credit facility are collateralized by each of the Nevada Utilities' general and refunding mortgage bonds. These credit facilities require that each of the Nevada Utilities' ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. Northern Powergrid Northern Powergrid has a £150 million unsecured credit facility expiring in April 2020. The credit facility has a variable interest rate based on sterling London Interbank Offered Rate ("LIBOR") plus a spread that varies based on its credit ratings. The credit facility requires that the ratio of consolidated senior total net debt, including current maturities, to regulated asset value not exceed 0.8 to 1.0 at Northern Powergrid and 0.65 to 1.0 at Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc as of June 30 and December 31. Northern Powergrid 's interest coverage ratio shall not be less than 2.5 to 1.0. AltaLink ALP has a C$500 million secured revolving credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which provides support for borrowings under the unsecured commercial paper program and may also be used for general corporate purposes, has a variable interest rate based on the Canadian bank prime lending rate or a spread above the Bankers' Acceptance rate, at ALP 's option, based on ALP 's credit ratings for its senior secured long-term debt securities. In addition, ALP has a C$75 million secured revolving credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which may be used for general corporate purposes and letters of credit, has a variable interest rate based on the Canadian bank prime lending rate, United States base rate, a spread above the United States LIBOR loan rate or a spread above the Bankers' Acceptance rate, at ALP 's option, based on ALP 's credit ratings for its senior secured long-term debt securities. As of December 31, 2018 and 2017 , ALP had $281 million and $121 million outstanding under these facilities at a weighted average interest rate of 2.26% and 1.42% , respectively. The credit facilities require the consolidated indebtedness to total capitalization not exceed 0.75 to 1.0 measured as of the last day of each quarter. AltaLink Investments, L.P. has a C$300 million unsecured revolving term credit facility expiring in December 2023 with a recurring one-year extension option subject to lender consent. The credit facility, which may be used for general corporate purposes and letters of credit to a maximum of C$10 million , has a variable interest rate based on the Canadian bank prime lending rate, United States base rate, a spread above the United States LIBOR loan rate or a spread above the Bankers' Acceptance rate, at AltaLink Investments, L.P.'s option, based on AltaLink Investments, L.P.'s credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , AltaLink Investments, L.P. had $64 million and $224 million outstanding under this facility at a weighted average interest rate of 3.25% and 2.40% , respectively. The credit facility requires the consolidated total debt to capitalization to not exceed 0.8 to 1.0 and earnings before interest, taxes, depreciation and amortization to interest expense for the four fiscal quarters ended to not be less than 2.25 to 1.0 measured as of the last day of each quarter. HomeServices HomeServices has a $600 million unsecured credit facility expiring in September 2022. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at HomeServices' option, plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. As of December 31, 2018 and 2017 , HomeServices had $404 million and $292 million , respectively, outstanding under its credit facility with a weighted average interest rate of 3.94% and 2.75% , respectively. Through its subsidiaries, HomeServices maintains mortgage lines of credit totaling $985 million and $1.0 billion as of December 31, 2018 and 2017 , respectively, used for mortgage banking activities that expire beginning in January 2019 through December 2019 or are due on demand. The mortgage lines of credit have variable rates based on LIBOR plus a spread. Collateral for these credit facilities is comprised of residential property being financed and is equal to the loans funded with the facilities. As of December 31, 2018 and 2017 , HomeServices had $436 million and $440 million , respectively, outstanding under these mortgage lines of credit at a weighted average interest rate of 4.42% and 3.60% , respectively. BHE Renewables Letters of Credit Topaz and Solar Star have separate letter of credit and reimbursement facilities used to (a) provide security under the power purchase agreement and large generator interconnection agreements, (b) fund the debt service reserve requirement and the operation and maintenance debt service reserve requirement and (c) provide security for remediation and mitigation liabilities. As of December 31, 2018 , Topaz had $127 million of letters of credit issued under its $134 million facility and Solar Star had $92 million of letters of credit issued under its $105 million facility. As of December 31, 2017 , Topaz had $75 million of letters of credit issued under its $134 million facility and Solar Star had $282 million of letters of credit issued under its $301 million facility. As of December 31, 2018 and 2017 , certain other renewable projects collectively have letters of credit outstanding of $103 million and $118 million , respectively, primarily in support of the power purchase agreements associated with the projects.
Short-Term Debt and Credit Facilities [Table Text Block]	The following table summarizes BHE's and its subsidiaries' availability under their credit facilities as of December 31 (in millions): MidAmerican NV Northern BHE PacifiCorp Funding Energy Powergrid AltaLink Other Total (1) 2018: Credit facilities (2) $ 3,500 $ 1,200 $ 1,309 $ 650 $ 231 $ 639 $ 1,585 $ 9,114 Less: Short-term debt (983 ) (30 ) (240 ) — (77 ) (345 ) (841 ) (2,516 ) Tax-exempt bond support and letters of credit — (89 ) (370 ) (80 ) — (4 ) — (543 ) Net credit facilities $ 2,517 $ 1,081 $ 699 $ 570 $ 154 $ 290 $ 744 $ 6,055 2017: Credit facilities $ 3,600 $ 1,000 $ 909 $ 650 $ 203 $ 1,054 $ 1,635 $ 9,051 Less: Short-term debt (3,331 ) (80 ) — — — (345 ) (732 ) (4,488 ) Tax-exempt bond support and letters of credit (7 ) (130 ) (370 ) (80 ) — (7 ) — (594 ) Net credit facilities $ 262 $ 790 $ 539 $ 570 $ 203 $ 702 $ 903 $ 3,969 (1) The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method. (2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Credit Facility The following table summarizes Sierra Pacific's availability under its credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 250 $ 250 Less - Water Facilities Refunding Revenue Bond support (80 ) (80 ) Net credit facilities $ 170 $ 170 Sierra Pacific has a $250 million secured credit facility expiring in June 2021 with a one-year extension option subject to lender consent. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific 's option, plus a spread that varies based on Sierra Pacific 's credit ratings for its senior secured long‑term debt securities. As of December 31 , 2018 and 2017 , Sierra Pacific had no borrowings outstanding under the credit facility. Amounts due under Sierra Pacific 's credit facility are collateralized by Sierra Pacific 's general and refunding mortgage bonds. The credit facility requires Sierra Pacific 's ratio of debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.
Short-Term Debt and Credit Facilities [Table Text Block]	The following table summarizes Sierra Pacific's availability under its credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 250 $ 250 Less - Water Facilities Refunding Revenue Bond support (80 ) (80 ) Net credit facilities $ 170 $ 170
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-term Debt and Credit Facilities The following table summarizes PacifiCorp's availability under its credit facilities as of December 31 (in millions): 2018: Credit facilities $ 1,200 Less: Short-term debt (30 ) Tax-exempt bond support (89 ) Net credit facilities $ 1,081 2017: Credit facilities $ 1,000 Less: Short-term debt (80 ) Tax-exempt bond support (130 ) Net credit facilities $ 790 PacifiCorp has a $600 million unsecured credit facility expiring in June 2021 with a one-year extension option subject to lender consent and a $600 million unsecured credit facility expiring in June 2021 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have variable interest rates based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2018 and 2017 , the weighted average interest rate on commercial paper borrowings outstanding was 2.85% and 1.83% , respectively. These credit facilities require that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of December 31, 2018 and 2017 , PacifiCorp had $184 million and $230 million , respectively, of fully available letters of credit issued under committed arrangements. As of December 31, 2018 and 2017 , $170 million and $216 million , respectively, of these letters of credit, support PacifiCorp's variable-rate tax-exempt bond obligations and expire in March 2019 and $14 million support certain transactions required by third parties and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date.
Short-Term Debt and Credit Facilities [Table Text Block]	The following table summarizes PacifiCorp's availability under its credit facilities as of December 31 (in millions): 2018: Credit facilities $ 1,200 Less: Short-term debt (30 ) Tax-exempt bond support (89 ) Net credit facilities $ 1,081 2017: Credit facilities $ 1,000 Less: Short-term debt (80 ) Tax-exempt bond support (130 ) Net credit facilities $ 790
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Short-Term Debt and Credit Facilities Interim financing of working capital needs and the construction program is obtained from unaffiliated parties through the sale of commercial paper or short-term borrowing from banks. MidAmerican Energy has a $900 million unsecured credit facility expiring June 2021 with a one-year extension option subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. In addition, MidAmerican Energy has a $5 million unsecured credit facility, which expires in June 2019 and has a variable interest rate based on the Eurodollar rate plus a spread. As of December 31, 2018, MidAmerican Energy had a $400 million unsecured credit facility expiring November 2019, which was terminated in January 2019. As of December 31, 2018 , the weighted average interest rate on commercial paper borrowings outstanding was 2.49% . The $900 million credit facility requires that MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of any quarter. As of December 31, 2018 , MidAmerican Energy was in compliance with the covenants of its credit facilities. MidAmerican Energy has authority from the FERC to issue commercial paper and bank notes aggregating $1.3 billion through July 31, 2020. The following table summarizes MidAmerican Energy's availability under its two unsecured revolving credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 1,305 $ 905 Less: Short-term debt outstanding (240 ) — Variable-rate tax-exempt bond support (370 ) (370 ) Net credit facilities $ 695 $ 535
Short-Term Debt and Credit Facilities [Table Text Block]	The following table summarizes MidAmerican Energy's availability under its two unsecured revolving credit facilities as of December 31 (in millions): 2018 2017 Credit facilities $ 1,305 $ 905 Less: Short-term debt outstanding (240 ) — Variable-rate tax-exempt bond support (370 ) (370 ) Net credit facilities $ 695 $ 535
Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Credit Facility Nevada Power has a $400 million secured credit facility expiring in June 2021 w ith a one-year extension option subject to lender consent. The credit facility, which is for general corporate purposes and provide for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power 's option, plus a spread that varies based on Nevada Power 's credit ratings for its senior secured long‑term debt securities. As of December 31 , 2018 and 2017 , Nevada Power had no borrowings outstanding under the credit facility. Amounts due under Nevada Power 's credit facility are collateralized by Nevada Power 's general and refunding mortgage bonds. The credit facility requires Nevada Power 's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.

BHE Debt (Tables)

BHE Debt (Tables)	12 Months Ended
	Dec. 31, 2018
MEHC Debt [Abstract]
BHE Debt [Table Text Block]	Senior Debt BHE senior debt represents unsecured senior obligations of BHE that are redeemable in whole or in part at any time generally with make-whole premiums. BHE senior debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 5.75% Senior Notes, due 2018 — — 650 2.00% Senior Notes, due 2018 — — 350 2.40% Senior Notes, due 2020 350 349 349 2.375% Senior Notes, due 2021 450 448 — 2.80% Senior Notes, due 2023 400 398 — 3.75% Senior Notes, due 2023 500 498 498 3.50% Senior Notes, due 2025 400 398 398 3.250% Senior Notes, due 2028 600 594 — 8.48% Senior Notes, due 2028 256 257 302 6.125% Senior Bonds, due 2036 1,670 1,661 1,660 5.95% Senior Bonds, due 2037 550 547 547 6.50% Senior Bonds, due 2037 225 222 222 5.15% Senior Notes, due 2043 750 740 739 4.50% Senior Notes, due 2045 750 738 737 3.80% Senior Notes, due 2048 750 737 — 4.45% Senior Notes, due 2049 1,000 990 — Total BHE Senior Debt $ 8,651 $ 8,577 $ 6,452 Reflected as: Current liabilities $ — $ 1,000 Noncurrent liabilities 8,577 5,452 Total BHE Senior Debt $ 8,577 $ 6,452 Junior Subordinated Debentures BHE junior subordinated debentures consists of the following as of December 31 (in millions): Par Value 2018 2017 Junior subordinated debentures, due 2057 100 100 100 Total BHE junior subordinated debentures - noncurrent $ 100 $ 100 $ 100 Long-term debt of subsidiaries consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 PacifiCorp $ 7,076 $ 7,036 $ 7,025 MidAmerican Funding 5,668 5,599 5,259 NV Energy 4,321 4,318 4,581 Northern Powergrid 2,621 2,626 2,805 BHE Pipeline Group 1,050 1,042 796 BHE Transmission 3,856 3,842 4,334 BHE Renewables 3,438 3,401 3,594 HomeServices 233 233 247 Total subsidiary debt $ 28,263 $ 28,097 $ 28,641 Reflected as: Current liabilities $ 2,106 $ 2,431 Noncurrent liabilities 25,991 26,210 Total subsidiary debt $ 28,097 $ 28,641 MidAmerican Energy's long-term debt consists of the following, including amounts maturing within one year and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 First mortgage bonds: 2.40%, due 2019 $ 500 $ 500 $ 499 3.70%, due 2023 250 249 248 3.50%, due 2024 500 500 501 3.10%, due 2027 375 372 372 4.80%, due 2043 350 346 346 4.40%, due 2044 400 395 394 4.25%, due 2046 450 445 445 3.95%, due 2047 475 470 470 3.65%, due 2048 700 688 — Notes: 5.3% Series, due 2018 — — 350 6.75% Series, due 2031 400 396 396 5.75% Series, due 2035 300 298 298 5.8% Series, due 2036 350 347 347 Transmission upgrade obligation, 4.45% and 3.42% due through 2035 and 2036, respectively 6 5 6 Variable-rate tax-exempt bond obligation series: (weighted average interest rate- 2018-1.74%, 2017-1.91%): Due 2023, issued in 1993 7 7 7 Due 2023, issued in 2008 57 57 57 Due 2024 35 35 35 Due 2025 13 13 13 Due 2036 33 33 33 Due 2038 45 45 45 Due 2046 30 29 29 Due 2047 150 149 149 Capital lease obligations - 4.16%, due through 2020 2 2 2 Total $ 5,428 $ 5,381 $ 5,042

Subsidiary Debt (Tables)

Subsidiary Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	Senior Debt BHE senior debt represents unsecured senior obligations of BHE that are redeemable in whole or in part at any time generally with make-whole premiums. BHE senior debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 5.75% Senior Notes, due 2018 — — 650 2.00% Senior Notes, due 2018 — — 350 2.40% Senior Notes, due 2020 350 349 349 2.375% Senior Notes, due 2021 450 448 — 2.80% Senior Notes, due 2023 400 398 — 3.75% Senior Notes, due 2023 500 498 498 3.50% Senior Notes, due 2025 400 398 398 3.250% Senior Notes, due 2028 600 594 — 8.48% Senior Notes, due 2028 256 257 302 6.125% Senior Bonds, due 2036 1,670 1,661 1,660 5.95% Senior Bonds, due 2037 550 547 547 6.50% Senior Bonds, due 2037 225 222 222 5.15% Senior Notes, due 2043 750 740 739 4.50% Senior Notes, due 2045 750 738 737 3.80% Senior Notes, due 2048 750 737 — 4.45% Senior Notes, due 2049 1,000 990 — Total BHE Senior Debt $ 8,651 $ 8,577 $ 6,452 Reflected as: Current liabilities $ — $ 1,000 Noncurrent liabilities 8,577 5,452 Total BHE Senior Debt $ 8,577 $ 6,452 Junior Subordinated Debentures BHE junior subordinated debentures consists of the following as of December 31 (in millions): Par Value 2018 2017 Junior subordinated debentures, due 2057 100 100 100 Total BHE junior subordinated debentures - noncurrent $ 100 $ 100 $ 100 Long-term debt of subsidiaries consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (in millions): Par Value 2018 2017 PacifiCorp $ 7,076 $ 7,036 $ 7,025 MidAmerican Funding 5,668 5,599 5,259 NV Energy 4,321 4,318 4,581 Northern Powergrid 2,621 2,626 2,805 BHE Pipeline Group 1,050 1,042 796 BHE Transmission 3,856 3,842 4,334 BHE Renewables 3,438 3,401 3,594 HomeServices 233 233 247 Total subsidiary debt $ 28,263 $ 28,097 $ 28,641 Reflected as: Current liabilities $ 2,106 $ 2,431 Noncurrent liabilities 25,991 26,210 Total subsidiary debt $ 28,097 $ 28,641 MidAmerican Energy's long-term debt consists of the following, including amounts maturing within one year and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 First mortgage bonds: 2.40%, due 2019 $ 500 $ 500 $ 499 3.70%, due 2023 250 249 248 3.50%, due 2024 500 500 501 3.10%, due 2027 375 372 372 4.80%, due 2043 350 346 346 4.40%, due 2044 400 395 394 4.25%, due 2046 450 445 445 3.95%, due 2047 475 470 470 3.65%, due 2048 700 688 — Notes: 5.3% Series, due 2018 — — 350 6.75% Series, due 2031 400 396 396 5.75% Series, due 2035 300 298 298 5.8% Series, due 2036 350 347 347 Transmission upgrade obligation, 4.45% and 3.42% due through 2035 and 2036, respectively 6 5 6 Variable-rate tax-exempt bond obligation series: (weighted average interest rate- 2018-1.74%, 2017-1.91%): Due 2023, issued in 1993 7 7 7 Due 2023, issued in 2008 57 57 57 Due 2024 35 35 35 Due 2025 13 13 13 Due 2036 33 33 33 Due 2038 45 45 45 Due 2046 30 29 29 Due 2047 150 149 149 Capital lease obligations - 4.16%, due through 2020 2 2 2 Total $ 5,428 $ 5,381 $ 5,042
Maturities of Long-term Debt [Table Text Block]	Annual Repayments of Long-Term Debt The annual repayments of BHE and subsidiary debt for the years beginning January 1, 2019 and thereafter, excluding fair value adjustments and unamortized premiums, discounts and debt issuance costs, are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total BHE senior notes $ — $ 350 $ 450 $ — $ 900 $ 6,951 $ 8,651 BHE junior subordinated debentures — — — — — 100 100 PacifiCorp 352 40 425 606 450 5,203 7,076 MidAmerican Funding 500 2 — 1 315 4,850 5,668 NV Energy 523 913 28 29 271 2,557 4,321 Northern Powergrid 80 462 31 479 33 1,536 2,621 BHE Pipeline Group — — 200 — — 850 1,050 BHE Transmission 148 245 — 348 367 2,748 3,856 BHE Renewables 483 168 175 172 177 2,263 3,438 HomeServices 20 27 33 153 — — 233 Totals $ 2,106 $ 2,207 $ 1,342 $ 1,788 $ 2,513 $ 27,058 $ 37,014
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Maturities of Long-term Debt [Table Text Block]	The annual repayments of MidAmerican Energy's long-term debt for the years beginning January 1, 2019 , and thereafter, excluding unamortized premiums, discounts and debt issuance costs, are as follows (in millions): 2019 $ 500 2020 2 2021 — 2022 — 2023 315 2024 and thereafter 4,611
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	Sierra Pacific 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 General and refunding mortgage securities: 3.375% Series T, due 2023 $ 250 $ 249 $ 248 2.600% Series U, due 2026 400 396 396 6.750% Series P, due 2037 252 255 255 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.250% Pollution Control Series 2016A, due 2029 (1) 20 20 20 1.500% Gas Facilities Series 2016A, due 2031 (1) 59 58 58 3.000% Gas and Water Series 2016B, due 2036 (2) 60 62 63 Variable-rate series (2018 - 1.750% to 1.820%, 2017 - 1.690% to 1.840%): Water Facilities Series 2016C, due 2036 30 30 30 Water Facilities Series 2016D, due 2036 25 25 25 Water Facilities Series 2016E, due 2036 25 25 25 Capital and financial lease obligations - 2.700% to 10.297%, due through 2054 38 38 34 Total long-term debt and financial and capital leases $ 1,159 $ 1,158 $ 1,154 Reflected as: Current portion of long-term debt and financial and capital lease obligations $ 3 $ 2 Long-term debt and financial and capital lease obligations 1,155 1,152 Total long-term debt and financial and capital leases $ 1,158 $ 1,154 (1) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time. (2) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time.
Maturities of Long-term Debt [Table Text Block]	The annual repayments of long-term debt and capital and financial leases for the years beginning January 1, 2019 and thereafter, are as follows (in millions): Long-term Capital and Financial Debt Lease Obligations Total 2019 $ — $ 6 $ 6 2020 — 4 4 2021 — 5 5 2022 — 4 4 2023 250 4 254 Thereafter 871 47 918 Total 1,121 70 1,191 Unamortized premium, discount and debt issuance cost (1 ) — (1 ) Amounts representing interest — (32 ) (32 ) Total $ 1,120 $ 38 $ 1,158
Nevada Power Company [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	Nevada Power 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 General and refunding mortgage securities: 6.500% Series O, due 2018 $ — $ — $ 324 6.500% Series S, due 2018 — — 499 7.125% Series V, due 2019 500 500 499 6.650% Series N, due 2036 367 358 357 6.750% Series R, due 2037 349 346 346 5.375% Series X, due 2040 250 247 247 5.450% Series Y, due 2041 250 236 236 2.750%, Series BB, due 2020 575 574 — Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.800% Pollution Control Bonds Series 2017A, due 2032 (1) 40 40 40 1.600% Pollution Control Bonds Series 2017, due 2036 (1) 40 39 39 1.600% Pollution Control Bonds Series 2017B, due 2039 (1) 13 13 13 Capital and financial lease obligations - 2.750% to 11.600%, due through 2054 463 463 475 Total long-term debt and financial and capital leases $ 2,847 $ 2,816 $ 3,075 Reflected as: Current portion of long-term debt and financial and capital lease obligations $ 520 $ 842 Long-term debt and financial and capital lease obligations 2,296 2,233 Total long-term debt and financial and capital leases $ 2,816 $ 3,075 (1) Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.
Maturities of Long-term Debt [Table Text Block]	The annual repayments of long-term debt and capital and financial leases for the years beginning January 1, 2019 and thereafter, are as follows (in millions): Long-term Capital and Financial Debt Lease Obligations Total 2019 $ 500 $ 78 $ 578 2020 575 77 652 2021 — 80 80 2022 — 76 76 2023 — 52 52 Thereafter 1,309 709 2,018 Total 2,384 1,072 3,456 Unamortized premium, discount and debt issuance cost (31 ) — (31 ) Executory costs — (74 ) (74 ) Amounts representing interest — (535 ) (535 ) Total $ 2,353 $ 463 $ 2,816
PacifiCorp [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	PacifiCorp's long-term debt and capital lease obligations were as follows as of December 31 (dollars in millions): 2018 2017 Average Average Principal Carrying Interest Carrying Interest Amount Value Rate Value Rate First mortgage bonds: 2.95% to 8.53%, due through 2023 $ 1,824 $ 1,821 4.48 % $ 2,320 4.73 % 3.35% to 6.71%, due 2024 to 2026 775 771 3.92 771 3.92 7.70% due 2031 300 298 7.70 298 7.70 5.25% to 6.35%, due 2034 to 2038 2,350 2,338 5.96 2,337 5.96 4.10% to 6.00%, due 2039 to 2042 950 939 5.40 938 5.40 4.125%, due 2049 600 593 4.13 — — Variable-rate series, tax-exempt bond obligations (2018-1.67% to 1.85%; 2017-1.60% to 1.87%): Due 2018 to 2020 38 38 1.85 79 1.77 Due 2018 to 2025 (1) 25 25 1.75 70 1.81 Due 2024 (1)(2) 143 142 1.68 142 1.73 Due 2024 to 2025 (2) 50 50 1.75 50 1.72 Total long-term debt 7,055 7,015 7,005 Capital lease obligations: 8.75% to 14.61%, due through 2035 21 21 10.55 20 11.46 Total long-term debt and capital lease obligations $ 7,076 $ 7,036 $ 7,025 Reflected as: 2018 2017 Current portion of long-term debt and capital lease obligations $ 352 $ 588 Long-term debt and capital lease obligations 6,684 6,437 Total long-term debt and capital lease obligations $ 7,036 $ 7,025 1) Supported by $170 million and $216 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018 and 2017 , respectively. 2) Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
Maturities of Long-term Debt [Table Text Block]	As of December 31, 2018 , the annual principal maturities of long-term debt and total capital lease obligations for 2019 and thereafter are as follows (in millions): Long-term Capital Lease Debt Obligations Total 2019 $ 350 $ 4 $ 354 2020 38 3 41 2021 420 7 427 2022 605 3 608 2023 449 2 451 Thereafter 5,193 16 5,209 Total 7,055 35 7,090 Unamortized discount and debt issuance costs (40 ) — (40 ) Amounts representing interest — (14 ) (14 ) Total $ 7,015 $ 21 $ 7,036
BHE Pipeline Group [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	BHE Pipeline Group BHE Pipeline Group 's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Northern Natural Gas: 5.75% Senior Notes, due 2018 $ — $ — $ 200 4.25% Senior Notes, due 2021 200 199 199 5.80% Senior Bonds, due 2037 150 149 149 4.10% Senior Bonds, due 2042 250 248 248 4.30% Senior Bonds, due 2049 450 446 — Total BHE Pipeline Group $ 1,050 $ 1,042 $ 796
PacifiCorp [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	PacifiCorp PacifiCorp's long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs as of December 31 (dollars in millions): Par Value 2018 2017 First mortgage bonds: 2.95% to 8.53%, due through 2023 $ 1,824 $ 1,821 $ 2,320 3.35% to 6.71%, due 2024 to 2026 775 771 771 7.70% due 2031 300 298 298 5.25% to 6.35%, due 2034 to 2038 2,350 2,338 2,337 4.10% to 6.00%, due 2039 to 2042 950 939 938 4.125%, due 2049 600 593 — Variable-rate series, tax-exempt bond obligations (2018-1.67% to 1.85%; 2017-1.60% to 1.87%): Due 2018 to 2020 38 38 79 Due 2018 to 2025 (1) 25 25 70 Due 2024 (1)(2) 143 142 142 Due 2024 to 2025 (2) 50 50 50 Capital lease obligations - 8.75% to 14.61%, due through 2035 21 21 20 Total PacifiCorp $ 7,076 $ 7,036 $ 7,025 (1) Supported by $170 million and $216 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018 and 2017 , respectively. (2) Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
MidAmerican Funding [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	MidAmerican Funding MidAmerican Funding's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 MidAmerican Funding: 6.927% Senior Bonds, due 2029 $ 240 $ 217 $ 216 MidAmerican Energy: Tax-exempt bond obligations - Variable-rate tax-exempt bond obligation series: (2018-1.74%, 2017-1.91%), due 2023-2047 370 368 368 First Mortgage Bonds: 2.40%, due 2019 500 500 499 3.70%, due 2023 250 249 248 3.50%, due 2024 500 501 501 3.10%, due 2027 375 372 372 4.80%, due 2043 350 346 346 4.40%, due 2044 400 394 394 4.25%, due 2046 450 445 445 3.95%, due 2047 475 470 470 3.65%, due 2048 700 688 — Notes: 5.30% Series, due 2018 — — 350 6.75% Series, due 2031 400 396 396 5.75% Series, due 2035 300 298 298 5.80% Series, due 2036 350 348 348 Transmission upgrade obligation, 4.45% and 3.42% due through 2035 and 2036, respectively 7 5 6 Capital lease obligations - 4.16%, due through 2020 1 2 2 Total MidAmerican Energy 5,428 5,382 5,043 Total MidAmerican Funding $ 5,668 $ 5,599 $ 5,259
NV Energy, Inc. [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	NV Energy NV Energy's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 NV Energy - 6.250% Senior Notes, due 2020 $ 315 $ 330 $ 337 Nevada Power: General and refunding mortgage securities: 6.500% Series O, due 2018 — — 324 6.500% Series S, due 2018 — — 499 7.125% Series V, due 2019 500 500 499 2.750%, Series BB, due 2020 575 574 — 6.650% Series N, due 2036 367 360 359 6.750% Series R, due 2037 349 348 348 5.375% Series X, due 2040 250 248 248 5.450% Series Y, due 2041 250 244 244 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.800% Pollution Control Bonds Series 2017A, due 2032 (1) 40 40 40 1.600% Pollution Control Bonds Series 2017, due 2036 (1) 40 39 39 1.600% Pollution Control Bonds Series 2017B, due 2039 (1) 13 13 13 Capital and financial lease obligations - 2.750% to 11.600%, due through 2054 463 463 475 Total Nevada Power 2,847 2,829 3,088 Sierra Pacific: General and refunding mortgage securities: 3.375% Series T, due 2023 250 249 249 2.600% Series U, due 2026 400 396 396 6.750% Series P, due 2037 252 256 256 Tax-exempt refunding revenue bond obligations: Fixed-rate series: 1.250% Pollution Control Series 2016A, due 2029 (2) 20 20 20 1.500% Gas Facilities Series 2016A, due 2031 (2) 59 58 58 3.000% Gas and Water Series 2016B, due 2036 (3) 60 62 63 Variable-rate series (2018 - 1.750% to 1.820%, 2017 - 1.690% to 1.840%): Water Facilities Series 2016C, due 2036 30 30 30 Water Facilities Series 2016D, due 2036 25 25 25 Water Facilities Series 2016E, due 2036 25 25 25 Capital and financial lease obligations - 2.700% to 10.297%, due through 2054 38 38 34 Total Sierra Pacific 1,159 1,159 1,156 Total NV Energy $ 4,321 $ 4,318 $ 4,581
Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	gages. Northern Powergrid Northern Powergrid and its subsidiaries' long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value (1) 2018 2017 8.875% Bonds, due 2020 $ 128 $ 133 $ 144 9.25% Bonds, due 2020 255 260 279 3.901% to 4.586% European Investment Bank loans, due 2018 to 2022 294 293 366 7.25% Bonds, due 2022 255 262 279 2.50% Bonds due 2025 191 189 200 2.073% European Investment Bank loan, due 2025 64 65 69 2.564% European Investment Bank loans, due 2027 319 318 336 7.25% Bonds, due 2028 237 241 256 4.375% Bonds, due 2032 191 188 199 5.125% Bonds, due 2035 255 252 267 5.125% Bonds, due 2035 191 189 200 Variable-rate bond, due 2026 (2) 241 236 210 Total Northern Powergrid $ 2,621 $ 2,626 $ 2,805 (1) The par values for these debt instruments are denominated in sterling. (2) Amortizes semiannually and the Company has entered into an interest rate swap that fixes the interest rate on 85% of the outstanding debt. The variable interest rate as of December 31, 2018 was 2.66% while the fixed interest rate was 2.82% .
BHE Transmission [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	BHE Transmission BHE Transmission 's long-term debt consists of the following, including fair value adjustments and unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value (1) 2018 2017 AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019 $ 147 $ 148 $ 162 Series 13-1 Senior Bonds, 3.265%, due 2020 147 148 161 Series 15-1 Senior Bonds, 2.244%, due 2022 147 146 158 Total AltaLink Investments, L.P. 441 442 481 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018 — — 159 Series 2013-2 Notes, 3.621%, due 2020 92 92 99 Series 2012-2 Notes, 2.978%, due 2022 202 201 218 Series 2013-4 Notes, 3.668%, due 2023 366 366 397 Series 2014-1 Notes, 3.399%, due 2024 256 256 278 Series 2016-1 Notes, 2.747%, due 2026 256 255 277 Series 2006-1 Notes, 5.249%, due 2036 110 109 119 Series 2010-1 Notes, 5.381%, due 2040 92 91 99 Series 2010-2 Notes, 4.872%, due 2040 110 109 119 Series 2011-1 Notes, 4.462%, due 2041 202 201 218 Series 2012-1 Notes, 3.990%, due 2042 385 380 412 Series 2013-3 Notes, 4.922%, due 2043 256 256 278 Series 2014-3 Notes, 4.054%, due 2044 216 215 233 Series 2015-1 Notes, 4.090%, due 2045 256 255 277 Series 2016-2 Notes, 3.717%, due 2046 330 328 356 Series 2013-1 Notes, 4.446%, due 2053 183 183 198 Series 2014-2 Notes, 4.274%, due 2064 95 95 103 Total AltaLink, L.P. 3,407 3,392 3,840 Other: Construction Loan, 5.660%, due 2020 8 8 13 Total BHE Transmission $ 3,856 $ 3,842 $ 4,334 (1) The par values for these debt instruments are denominated in Canadian dollars.
BHE Renewables [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	llars. BHE Renewables BHE Renewables ' long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Fixed-rate (1) : Bishop Hill Holdings Senior Notes, 5.125%, due 2032 85 84 93 Solar Star Funding Senior Notes, 3.950%, due 2035 295 292 310 Solar Star Funding Senior Notes, 5.375%, due 2035 924 915 965 Grande Prairie Wind Senior Notes, 3.860%, due 2037 396 392 404 Topaz Solar Farms Senior Notes, 5.750%, due 2039 718 709 745 Topaz Solar Farms Senior Notes, 4.875%, due 2039 207 205 217 Alamo 6 Senior Notes, 4.170%, due 2042 224 221 229 Other 16 16 19 Variable-rate (1) : Pinyon Pines I and II Term Loans, due 2019 (2) 310 310 333 TX Jumbo Road Term Loan, due 2025 (2) 180 176 193 Marshall Wind Term Loan, due 2026 (2) 83 81 86 Total BHE Renewables $ 3,438 $ 3,401 $ 3,594 (1) Amortizes quarterly or semiannually. (2) The term loans have variable interest rates based on LIBOR plus a margin that varies during the terms of the agreements. The Company has entered into interest rate swaps that fix the interest rate on 75% of the Pinyon Pines outstanding debt and 100% of the TX Jumbo Road and Marshall Wind outstanding debt. The variable interest rate as of December 31, 2018 and 2017 was 4.55% and 3.32% , respectively, while the fixed interest rates as of December 31, 2018 and 2017 ranged from 3.21% to 3.63% .
HomeServices [Member]
Debt Instrument [Line Items]
Subsidiary Debt [Table Text Block]	HomeServices HomeServices ' long-term debt consists of the following, including unamortized premiums, discounts and debt issuance costs, as of December 31 (dollars in millions): Par Value 2018 2017 Variable-rate (1) : Variable-rate term loan (2018 - 4.022%, 2017 - 2.819%), due 2022 $ 233 $ 233 $ 247 (1) Amortizes quarterly.

Risk Management and Hedging A_2

Risk Management and Hedging Activities (Tables) - PacifiCorp [Member]	12 Months Ended
	Dec. 31, 2018
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2018: Not designated as hedging contracts (1) : Commodity assets $ 36 $ 4 $ 10 $ 1 $ 51 Commodity liabilities (9 ) (1 ) (67 ) (71 ) (148 ) Total 27 3 (57 ) (70 ) (97 ) Total derivatives 27 3 (57 ) (70 ) (97 ) Cash collateral (payable) receivable (2 ) — 16 45 59 Total derivatives - net basis $ 25 $ 3 $ (41 ) $ (25 ) $ (38 ) As of December 31, 2017: Not designated as hedging contracts (1) : Commodity assets $ 11 $ 1 $ 1 $ — $ 13 Commodity liabilities (3 ) — (32 ) (82 ) (117 ) Total 8 1 (31 ) (82 ) (104 ) Total derivatives 8 1 (31 ) (82 ) (104 ) Cash collateral receivable — — 17 57 74 Total derivatives - net basis $ 8 $ 1 $ (14 ) $ (25 ) $ (30 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of December 31, 2018 and 2017 , a regulatory asset of $96 million and $101 million , respectively, was recorded related to the net derivative liability of $97 million and $104 million , respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts [Table Text Block]	The following table reconciles the beginning and ending balances of PacifiCorp's regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in regulatory assets, as well as amounts reclassified to earnings for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ 101 $ 73 $ 133 Changes in fair value recognized in regulatory assets 12 47 (27 ) Net (losses) gains reclassified to operating revenue (68 ) 9 10 Net gains (losses) reclassified to energy costs 51 (28 ) (43 ) Ending balance $ 96 $ 101 $ 73
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions): Unit of Measure 2018 2017 Electricity sales Megawatt hours (6 ) (9 ) Natural gas purchases Decatherms 117 113 Fuel oil purchases Gallons — —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block]	The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): Commodity Derivatives Interest Rate Derivatives Auction Rate Securities 2018 2017 2016 2018 2017 2016 2018 2017 2016 Beginning balance $ 94 $ 60 $ 47 $ 9 $ 6 $ 4 $ — $ — $ 44 Changes included in earnings 1 23 8 181 147 121 — — 5 Changes in fair value recognized in OCI 2 (3 ) (2 ) — — — — — 8 Changes in fair value recognized in net regulatory assets 3 (1 ) (11 ) — — — — — — Purchases 3 1 1 — 4 — — — — Redemptions — — — — — — — — (57 ) Settlements (4 ) 14 17 (180 ) (148 ) (119 ) — — — Ending balance $ 99 $ 94 $ 60 $ 10 $ 9 $ 6 $ — $ — $ —
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of the UK Plan assets, by major category (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 3 $ 59 $ — $ 62 Debt securities: United Kingdom government obligations 891 — — 891 Equity securities: Investment funds (2) — 697 — 697 Real estate funds — — 239 239 Total $ 894 $ 756 $ 239 1,889 Investment funds (2) measured at net asset value 100 Total assets measured at fair value $ 1,989 As of December 31, 2017: Cash equivalents $ 4 $ 30 $ — $ 34 Debt securities: United Kingdom government obligations 870 — — 870 Equity securities: Investment funds (2) — 1,027 — 1,027 Real estate funds — — 230 230 Total $ 874 $ 1,057 $ 230 2,161 Investment funds (2) measured at net asset value 207 Total assets measured at fair value $ 2,368 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 36% and 64% , respectively, for 2018 and 21% and 79% , respectively, for 2017 . The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 8 $ 41 $ 49 Debt securities: United States government obligations 160 — 160 International government obligations — 5 5 Corporate obligations — 373 373 Municipal obligations — 29 29 Agency, asset and mortgage-backed obligations — 123 123 Equity securities: United States companies 492 1 493 International companies 108 — 108 Investment funds (2) 119 — 119 Total assets in the fair value hierarchy $ 887 $ 572 1,459 Investment funds (2) measured at net asset value 792 Limited partnership interests (3) measured at net asset value 104 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 2,396 As of December 31, 2017: Cash equivalents $ 10 $ 76 $ 86 Debt securities: United States government obligations 218 — 218 Corporate obligations — 350 350 Municipal obligations — 16 16 Agency, asset and mortgage-backed obligations — 110 110 Equity securities: United States companies 622 — 622 International companies 136 — 136 Investment funds (2) 83 20 103 Total assets in the fair value hierarchy $ 1,069 $ 572 1,641 Investment funds (2) measured at net asset value 1,019 Limited partnership interests (3) measured at net asset value 63 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 2,761 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 62% and 38% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 73% and 27% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 10 $ 2 $ 12 Debt securities: United States government obligations 13 — 13 Corporate obligations — 42 42 Municipal obligations — 45 45 Agency, asset and mortgage-backed obligations — 30 30 Equity securities: United States companies 158 — 158 International companies 6 — 6 Investment funds 202 1 203 Total assets in the fair value hierarchy $ 389 $ 120 509 Investment funds measured at net asset value 149 Limited partnership interests measured at net asset value 6 Total assets measured at fair value $ 664 As of December 31, 2017: Cash equivalents $ 11 $ 3 $ 14 Debt securities: United States government obligations 20 — 20 Corporate obligations — 36 36 Municipal obligations — 46 46 Agency, asset and mortgage-backed obligations — 29 29 Equity securities: United States companies 185 — 185 International companies 8 — 8 Investment funds (2) 219 1 220 Total assets in the fair value hierarchy $ 443 $ 115 558 Investment funds (2) measured at net asset value 174 Limited partnership interests (3) measured at net asset value 4 Total assets measured at fair value $ 736 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 79% and 21% , respectively, for 2018 and 73% and 27% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ 1 $ 91 $ 108 $ (52 ) $ 148 Interest rate derivatives 1 13 10 — 24 Mortgage loans held for sale — 468 — — 468 Money market mutual funds (2) 409 — — — 409 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 1,441 — — — 1,441 Investment funds 128 — — — 128 $ 2,423 $ 625 $ 118 $ (52 ) $ 3,114 Liabilities: Commodity derivatives $ (1 ) $ (180 ) $ (9 ) $ 111 $ (79 ) Interest rate derivatives — (32 ) — — (32 ) $ (1 ) $ (212 ) $ (9 ) $ 111 $ (111 ) As of December 31, 2017: Assets: Commodity derivatives $ 1 $ 42 $ 104 $ (29 ) $ 118 Interest rate derivatives — 15 9 — 24 Mortgage loans held for sale — 465 — — 465 Money market mutual funds (2) 685 — — — 685 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 1,968 — — — 1,968 Investment funds 178 — — — 178 $ 3,296 $ 565 $ 113 $ (29 ) $ 3,945 Liabilities: Commodity derivatives $ (3 ) $ (167 ) $ (10 ) $ 105 $ (75 ) Interest rate derivatives — (8 ) — — (8 ) $ (3 ) $ (175 ) $ (10 ) $ 105 $ (83 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of the Company's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,774 $ 39,398 $ 35,193 $ 40,522
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents Nevada Power 's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Total As of December 31, 2018: Assets: Commodity derivatives $ — $ — $ 7 $ 7 Money market mutual funds (1) 104 — — 104 Investment funds 1 — — 1 $ 105 $ — $ 7 $ 112 Liabilities - commodity derivatives $ — $ — $ (4 ) $ (4 ) As of December 31, 2017: Assets - investment funds $ 2 $ — $ — $ 2 Liabilities - commodity derivatives $ — $ — $ (3 ) $ (3 ) (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table reconciles the beginning and ending balances of Nevada Power 's net commodity derivative assets or liabilities measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): 2018 2017 2016 Beginning balance $ (3 ) $ (14 ) $ (22 ) Changes in fair value recognized in regulatory assets or liabilities 4 (3 ) (4 ) Settlements 2 14 12 Ending balance $ 3 $ (3 ) $ (14 )
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of Nevada Power 's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,353 $ 2,651 $ 2,600 $ 3,088
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements Level 1 (1) Level 2 (1) Level 3 (1) Total As of December 31, 2018: Cash equivalents $ — $ 11 $ — $ 11 Debt securities: United States government obligations 4 — — 4 International government obligations — 1 — 1 Corporate obligations — 88 — 88 Municipal obligations — 10 — 10 Agency, asset and mortgage-backed obligations — 43 — 43 Equity securities: United States companies 327 — — 327 International companies 15 — — 15 Investment funds (2) 54 — — 54 Total assets in the fair value hierarchy $ 400 $ 153 $ — 553 Investment funds (2) measured at net asset value 285 Limited partnership interests (3) measured at net asset value 104 Investments at fair value $ 942 As of December 31, 2017: Cash equivalents $ — $ 43 $ — $ 43 Debt securities: United States government obligations 45 — — 45 Corporate obligations — 60 — 60 Municipal obligations — 9 — 9 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 416 — — 416 International companies 22 — — 22 Total assets in the fair value hierarchy $ 483 $ 149 $ — 632 Investment funds (2) measured at net asset value 416 Limited partnership interests (3) measured at net asset value 63 Investments at fair value $ 1,111 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 55% and 45% respectively, for 2018 and 60% and 40% , respectively, for 2017 , and are invested in United States and international securities of approximately 68% and 32% , respectively, for 2018 and 57% and 43% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions): Input Levels for Fair Value Measurements Level 1(1) Level 2(1) Level 3(1) Total As of December 31, 2018: Cash and cash equivalents $ 4 $ 1 $ — $ 5 Debt securities: United States government obligations 3 — — 3 Corporate obligations — 23 — 23 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 17 — 17 Equity securities: United States companies 83 — — 83 International companies 4 — — 4 Investment funds (2) 38 — — 38 Total assets in the fair value hierarchy 132 43 — 175 Investment funds (2) measured at net asset value 116 Limited partnership interests (3) measured at net asset value 6 Investments at fair value $ 297 As of December 31, 2017: Cash and cash equivalents $ 4 $ 3 $ — $ 7 Debt securities: United States government obligations 11 — — 11 Corporate obligations — 16 — 16 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 16 — 16 Equity securities: United States companies 98 — — 98 International companies 6 — — 6 Investment funds (2) 32 — — 32 Total assets in the fair value hierarchy 151 37 — 188 Investment funds (2) measured at net asset value 140 Limited partnership interests (3) measured at net asset value 4 Investments at fair value $ 332 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 63% and 37% , respectively, for 2017 , and are invested in United States and international securities of approximately 90% and 10% , respectively, for 2018 and 77% and 23% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 51 $ — $ (23 ) $ 28 Money market mutual funds (2) 69 — — — 69 Investment funds 24 — — — 24 $ 93 $ 51 $ — $ (23 ) $ 121 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 82 $ (66 ) As of December 31, 2017: Assets: Commodity derivatives $ — $ 13 $ — $ (4 ) $ 9 Money market mutual funds (2) 21 — — — 21 Investment funds 21 — — — 21 $ 42 $ 13 $ — $ (4 ) $ 51 Liabilities - Commodity derivatives $ — $ (117 ) $ — $ 78 $ (39 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $74 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,015 $ 7,833 $ 7,005 $ 8,370
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ — $ 20 $ — $ 20 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 63 — 63 Municipal obligations — 6 — 6 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 111 — — 111 International companies 35 — — 35 Investment funds (2) 65 — — 65 Total assets in the hierarchy $ 217 $ 126 $ — — Investment funds (2) measured at net asset value 260 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 644 As of December 31, 2017: Cash equivalents $ — $ 17 $ — $ 17 Debt securities: United States government obligations 21 — — 21 Corporate obligations — 59 — 59 Municipal obligations — 7 — 7 Agency, asset and mortgage-backed obligations — 33 — 33 Equity securities: United States companies 137 — — 137 International companies 44 — — 44 Investment funds (2) 74 — — 74 Total assets in the hierarchy $ 276 $ 116 $ — 392 Investment funds (2) measured at net asset value 315 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 745 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 69% and 31% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 74% and 26% , respectively, for 2018 and 72% and 28% , respectively, for 2017 . The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 5 $ — $ — $ 5 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 12 — 12 Municipal obligations — 43 — 43 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 73 — — 73 Investment funds (2) 96 — — 96 Total assets measured at fair value $ 180 $ 67 $ — $ 247 As of December 31, 2017: Cash equivalents $ 6 $ — $ — $ 6 Debt securities: United States government obligations 5 — — 5 Corporate obligations — 14 — 14 Municipal obligations — 44 — 44 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 84 — — 84 Investment funds (2) 112 — — 112 Total assets measured at fair value $ 207 $ 70 $ — $ 277 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22% , respectively, for 2018 and 81% and 19% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 41% and 59% , respectively, for 2018 and 42% and 58% , respectively, for 2017 . The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 4 $ 2 $ (3 ) $ 3 Money market mutual funds (2) 2 — — — 2 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 6 — — — 6 Investment funds 10 — — — 10 $ 461 $ 57 $ 2 $ (3 ) $ 517 Liabilities: Commodity derivatives $ — $ (4 ) $ (2 ) $ 3 $ (3 ) Interest rate derivatives (3) — (19 ) — — (19 ) $ — $ (23 ) $ (2 ) $ 3 $ (22 ) As of December 31, 2017 Assets: Commodity derivatives $ — $ 3 $ 4 $ (2 ) $ 5 Money market mutual funds (2) 133 — — — 133 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 7 — — — 7 Investment funds 15 — — — 15 $ 619 $ 46 $ 4 $ (2 ) $ 667 Liabilities - commodity derivatives $ — $ (9 ) $ (1 ) $ 2 $ (8 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $- million as of December 31, 2018 and 2017 . (2) Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table reconciles the beginning and ending balances of MidAmerican Energy's assets measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions): Commodity Derivatives Auction Rate Securities 2018 2017 2016 2018 2017 2016 Beginning balance $ 3 $ (2 ) $ (6 ) $ — $ — $ 26 Transfer to affiliate (1) — — (4 ) — — — Changes included in earnings — — — — — 5 Changes in fair value recognized in OCI — — — — — 4 Changes in fair value recognized in net regulatory assets (3 ) 2 (6 ) — — — Redemptions — — — — — (35 ) Settlements — 3 14 — — — Ending balance $ — $ 3 $ (2 ) $ — $ — $ — (1) On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE.
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt as of December 31 (in millions): 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,381 $ 5,646 $ 5,042 $ 5,686
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of MidAmerican Funding's long-term debt as of December 31 (in millions): 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,621 $ 5,943 $ 5,282 $ 6,006
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents Sierra Pacific 's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Total As of December 31, 2018: Assets: Commodity derivatives $ — $ — $ 2 $ 2 Money market mutual funds (1) 45 — — 45 $ 45 $ — $ 2 $ 47 As of December 31, 2017: Assets - investment funds $ — $ — $ — $ — (1) Amounts are included in cash and cash equivalents on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying value and estimated fair value of Sierra Pacific 's long-term debt as of December 31 (in millions): 2018 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,167 $ 1,120 $ 1,221

Other, Net (Tables)

Other, Net (Tables)	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Other, net, as shown on the Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Interest income and other, net 3 6 1 Total $ 30 $ 37 $ 29
MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Other, net, as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Gains on sales of assets and other investments 1 1 3 Loss on debt tender offer — (29 ) — Interest income and other, net 3 6 3 Total $ 31 $ 9 $ 34 Refer to Note 8 for information regarding the debt tender offer.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax (benefit) expense consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (686 ) $ (653 ) $ (743 ) State (9 ) (3 ) 1 Foreign 104 83 55 (591 ) (573 ) (687 ) Deferred: Federal 165 (76 ) 1,164 State (131 ) 100 (59 ) Foreign (20 ) 2 (7 ) 14 26 1,098 Investment tax credits (6 ) (7 ) (8 ) Total $ (583 ) $ (554 ) $ 403
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax (benefit) expense is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (30 ) (20 ) (14 ) Effects of ratemaking (8 ) (1 ) — State income tax, net of federal income tax benefit (6 ) 3 (1 ) Effects of tax rate change and repatriation tax (4 ) (31 ) — Income tax effect of foreign income (3 ) (5 ) (6 ) Equity income 1 (2 ) 2 Other, net (1 ) (1 ) (2 ) Effective income tax rate (30 )% (22 )% 14 %
Components of Net Deferred Income Tax Liability [Table Text Block]	The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 1,674 $ 1,707 Federal, state and foreign carryforwards 596 1,118 AROs 232 223 Employee benefits 68 45 Other 459 450 Total deferred income tax assets 3,029 3,543 Valuation allowances (137 ) (126 ) Total deferred income tax assets, net 2,892 3,417 Deferred income tax liabilities: Property-related items (10,185 ) (9,950 ) Investments (876 ) (843 ) Regulatory assets (656 ) (651 ) Other (222 ) (215 ) Total deferred income tax liabilities (11,939 ) (11,659 ) Net deferred income tax liability $ (9,047 ) $ (8,242 )
Summary of Operating Loss Carryforwards [Table Text Block]	The following table provides the Company's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions): Federal State Foreign Total Net operating loss carryforwards (1) $ 284 $ 5,577 $ 562 $ 6,423 Deferred income taxes on net operating loss carryforwards $ 60 $ 312 $ 151 $ 523 Expiration dates 2023-2026 2019-2038 2035-2038 Tax credits $ 45 $ 28 $ — $ 73 Expiration dates 2023- indefinite 2019- indefinite (1) The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.
Net Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balances of the Company's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 181 $ 128 Additions based on tax positions related to the current year 4 6 Additions for tax positions of prior years 38 70 Reductions for tax positions of prior years (38 ) (18 ) Statute of limitations 2 (4 ) Settlements (2 ) (1 ) Ending balance $ 185 $ 181
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ 164 $ 249 $ 169 State 40 41 32 Total 204 290 201 Deferred: Federal (187 ) 59 123 State (9 ) 15 21 Total (196 ) 74 144 Investment tax credits (3 ) (4 ) (5 ) Total income tax expense $ 5 $ 360 $ 340
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % State income taxes, net of federal income tax benefit 4 3 3 Amortization of excess deferred income taxes (17 ) — — Federal income tax credits (7 ) (5 ) (6 ) Other — (1 ) (1 ) Effective income tax rate 1 % 32 % 31 %
Components of Net Deferred Income Tax Liability [Table Text Block]	The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 752 $ 756 Employee benefits 91 84 Derivative contracts and unamortized contract values 45 48 State carryforwards 77 83 Asset retirement obligations 53 50 Other 56 50 1,074 1,071 Deferred income tax liabilities: Property, plant and equipment (3,335 ) (3,381 ) Regulatory assets (273 ) (261 ) Other (9 ) (11 ) (3,617 ) (3,653 ) Net deferred income tax liability $ (2,543 ) $ (2,582 )
Summary of Operating Loss Carryforwards [Table Text Block]	The following table provides PacifiCorp's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions): State Net operating loss carryforwards $ 1,230 Deferred income taxes on net operating loss carryforwards $ 58 Expiration dates 2019 - 2032 Tax credit carryforwards $ 19 Expiration dates 2019 - indefinite
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	MidAmerican Energy's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (276 ) $ (490 ) $ (479 ) State (12 ) (25 ) (14 ) (288 ) (515 ) (493 ) Deferred: Federal 42 335 366 State (8 ) (2 ) (4 ) 34 333 362 Investment tax credits (1 ) (1 ) (1 ) Total $ (255 ) $ (183 ) $ (132 )
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (73 ) (68 ) (61 ) State income tax, net of federal income tax benefit (4 ) (4 ) (3 ) Effects of ratemaking (5 ) (7 ) (3 ) 2017 Tax Reform 1 2 — Other, net — (1 ) — Effective income tax rate (60 )% (43 )% (32 )%
Components of Net Deferred Income Tax Liability [Table Text Block]	MidAmerican Energy's net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 405 $ 443 Asset retirement obligations 164 160 Employee benefits 47 45 Other 80 57 Total deferred income tax assets 696 705 Deferred income tax liabilities: Depreciable property (2,945 ) (2,865 ) Regulatory assets (61 ) (42 ) Other (12 ) (35 ) Total deferred income tax liabilities (3,018 ) (2,942 ) Net deferred income tax liability $ (2,322 ) $ (2,237 )
Net Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balances of MidAmerican Energy's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 12 $ 10 Additions based on tax positions related to the current year 4 1 Additions for tax positions of prior years 47 23 Reductions based on tax positions related to the current year (4 ) (4 ) Reductions for tax positions of prior years (48 ) (19 ) Interest and penalties (1 ) 1 Ending balance $ 10 $ 12
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	MidAmerican Funding's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current: Federal $ (280 ) $ (505 ) $ (485 ) State (14 ) (31 ) (16 ) (294 ) (536 ) (501 ) Deferred: Federal 42 338 367 State (9 ) (3 ) (4 ) 33 335 363 Investment tax credits (1 ) (1 ) (1 ) Total $ (262 ) $ (202 ) $ (139 )
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate MidAmerican Funding's the effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31: 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Income tax credits (76 ) (77 ) (64 ) State income tax, net of federal income tax benefit (4 ) (6 ) (3 ) Effects of ratemaking (6 ) (8 ) (3 ) 2017 Tax Reform 1 3 — Other, net — (1 ) — Effective income tax rate (64 )% (54 )% (35 )%
Components of Net Deferred Income Tax Liability [Table Text Block]	MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 405 $ 443 Asset retirement obligations 164 160 Employee benefits 47 45 Other 85 62 Total deferred income tax assets 701 710 Deferred income tax liabilities: Depreciable property (2,947 ) (2,868 ) Regulatory assets (62 ) (42 ) Other (11 ) (35 ) Total deferred income tax liabilities (3,020 ) (2,945 ) Net deferred income tax liability $ (2,319 ) $ (2,235 )
Net Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 12 $ 10 Additions based on tax positions related to the current year 4 1 Additions for tax positions of prior years 47 23 Reductions based on tax positions related to the current year (4 ) (4 ) Reductions for tax positions of prior years (48 ) (19 ) Interest and penalties (1 ) 1 Ending balance $ 10 $ 12
Nevada Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current – Federal $ 84 $ 62 $ 68 Deferred – Federal (13 ) 95 79 Uncertain tax positions 2 — — Investment tax credits (1 ) (1 ) (1 ) Total income tax expense $ 72 $ 156 $ 146
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31 : 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Non-deductible expenses 3 — — Effect of ratemaking — 1 — Effect of tax rate change — 1 — Other — 1 (1 ) Effective income tax rate 24 % 38 % 34 %
Components of Net Deferred Income Tax Liability [Table Text Block]	The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 209 $ 201 Capital and financial leases 97 100 Employee benefits 15 18 Customer advances 18 14 Other 9 6 Total deferred income tax assets 348 339 Deferred income tax liabilities: Property related items (799 ) (796 ) Regulatory assets (196 ) (206 ) Capital and financial leases (94 ) (97 ) Other (8 ) (7 ) Total deferred income tax liabilities (1,097 ) (1,106 ) Net deferred income tax liability $ (749 ) $ (767 )
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax expense (benefit) consists of the following for the years ended December 31 (in millions): 2018 2017 2016 Current – Federal $ 23 $ — $ — Deferred – Federal 7 56 50 Uncertain tax positions 1 — — Investment tax credits (1 ) (1 ) (1 ) Total income tax expense $ 30 $ 55 $ 49
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31 : 2018 2017 2016 Federal statutory income tax rate 21 % 35 % 35 % Non-deductible expenses 4 — — Effects of ratemaking — — 1 Effect of tax rate change — (1 ) — Other — — 1 Effective income tax rate 25 % 34 % 37 %
Components of Net Deferred Income Tax Liability [Table Text Block]	The net deferred income tax liability consists of the following as of December 31 (in millions): 2018 2017 Deferred income tax assets: Regulatory liabilities $ 70 $ 67 Federal net operating loss and credit carryforwards — 10 Employee benefit plans 10 10 Capital and financial leases 8 7 Customer Advances 8 7 Other 6 6 Total deferred income tax assets 102 107 Deferred income tax liabilities: Property related items (346 ) (349 ) Regulatory assets (73 ) (74 ) Capital and financial leases (8 ) (7 ) Other (6 ) (7 ) Total deferred income tax liabilities (433 ) (437 ) Net deferred income tax liability $ (331 ) $ (330 )

Supplemental Cash Flow Disclo_2

Supplemental Cash Flow Disclosures (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information: Interest paid, net of amounts capitalized $ 1,713 $ 1,715 $ 1,673 Income taxes received, net (1) $ 780 $ 540 $ 1,016 Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 823 $ 653 $ 547 Common stock exchanged for junior subordinated debentures $ — $ 100 $ — (1) Includes $884 million , $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018 , 2017 and 2016 , respectively.
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Interest paid, net of amounts capitalized $ 347 $ 350 $ 350 Income taxes paid, net $ 144 $ 340 $ 201 Supplemental disclosure of non-cash investing and financing activities: Accounts payable related to property, plant and equipment additions $ 184 $ 147 $ 101
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental cash flow information: Interest paid, net of amounts capitalized $ 198 $ 193 $ 181 Income taxes received, net $ 494 $ 465 $ 601 Supplemental disclosure of non-cash investing transactions: Accounts payable related to utility plant additions $ 371 $ 224 $ 131 Dividend of unregulated retail services business $ — $ — $ 90
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and 2017 as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): As of December 31, 2018 2017 Cash and cash equivalents $ 1 $ 172 Restricted cash and cash equivalents in other current assets 56 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 57 $ 282 The summary of supplemental cash flow information as of and for the years ending December 31 is as follows (in millions): 2018 2017 2016 Supplemental cash flow information: Interest paid, net of amounts capitalized $ 218 $ 218 $ 204 Income taxes received, net $ 511 $ 472 $ 609 Supplemental disclosure of non-cash investing transactions: Accounts payable related to utility plant additions $ 371 $ 224 $ 131 Transfer of unregulated retail services business to affiliate $ — $ — $ 90
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information - Interest paid, net of amounts capitalized $ 166 $ 167 $ 173 Income taxes paid $ 117 $ 89 $ — Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 34 $ 18 $ 19 Capital and financial lease obligations incurred $ 1 $ — $ (1 ) A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions): As of December 31, December 31, 2018 2017 Cash and cash equivalents $ 111 $ 57 Restricted cash and cash equivalents included in other current assets 10 9 Total cash and cash equivalents and restricted cash and cash equivalents $ 121 $ 66
Sierra Pacific Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions): 2018 2017 2016 Supplemental disclosure of cash flow information - Interest paid, net of amounts capitalized $ 41 $ 40 $ 47 Income taxes paid $ 19 $ — $ — Supplemental disclosure of non-cash investing and financing transactions: Accruals related to property, plant and equipment additions $ 15 $ 10 $ 15 Capital and financial lease obligations incurred $ 6 $ 1 $ — A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of December 31, 2018 and December 31, 2017 , as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Balance Sheets (in millions): As of December 31, December 31, 2018 2017 Cash and cash equivalents $ 71 $ 4 Restricted cash and cash equivalents included in other current assets 5 4 Total cash and cash equivalents and restricted cash and cash equivalents $ 76 $ 8

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 21 $ 24 $ 29 $ 9 $ 9 $ 9 Interest cost 105 116 126 24 29 31 Expected return on plan assets (164 ) (160 ) (160 ) (41 ) (40 ) (41 ) Settlement 21 — — — — — Net amortization 28 25 46 (13 ) (14 ) (12 ) Net periodic benefit cost (credit) $ 11 $ 5 $ 41 $ (21 ) $ (16 ) $ (13 ) Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions): 2018 2017 2016 Service cost $ 19 $ 23 $ 20 Interest cost 56 58 72 Expected return on plan assets (101 ) (100 ) (110 ) Settlement 44 31 — Net amortization 45 63 44 Net periodic benefit cost $ 63 $ 75 $ 26
Changes in Fair Value of Plan Assets [Table Text Block]	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 2,761 $ 2,525 $ 736 $ 666 Employer contributions 38 64 8 5 Participant contributions — — 8 10 Actual return on plan assets (147 ) 390 (38 ) 106 Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): 2018 2017 Plan assets at fair value, beginning of year $ 2,368 $ 2,169 Employer contributions 60 58 Participant contributions 1 1 Actual return on plan assets (44 ) 145 Settlement (205 ) (144 ) Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (120 ) 207 Plan assets at fair value, end of year $ 1,989 $ 2,368
Changes in Projected Benefit Obligations [Table Text Block]	following table is a reconciliation of the benefit obligation for the years ended December 31 (in millions): 2018 2017 Benefit obligation, beginning of year $ 2,201 $ 2,125 Service cost 19 23 Interest cost 56 58 Participant contributions 1 1 Actuarial gain (87 ) (4 ) Settlement (182 ) (131 ) Amendment 8 — Benefits paid (71 ) (68 ) Foreign currency exchange rate changes (112 ) 197 Benefit obligation, end of year $ 1,833 $ 2,201 Accumulated benefit obligation, end of year $ 1,637 $ 1,933 The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 3,006 $ 2,952 $ 721 $ 734 Service cost 21 24 9 9 Interest cost 105 116 24 29 Participant contributions — — 8 10 Actuarial (gain) loss (160 ) 132 (40 ) (10 ) Amendment 2 — — — Settlement (119 ) (15 ) — — Benefits paid (137 ) (203 ) (50 ) (51 ) Benefit obligation, end of year $ 2,718 $ 3,006 $ 672 $ 721 Accumulated benefit obligation, end of year $ 2,709 $ 2,988
Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The fair value of plan assets, projected benefit obligation and accumulated benefit obligation for (1) pension and other postretirement benefit plans with a projected benefit obligation in excess of the fair value of plan assets and (2) pension plans with an accumulated benefit obligation in excess of the fair value of plan assets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Fair value of plan assets $ 1,752 $ 2,016 $ 417 $ 126 Projected benefit obligation $ 2,091 $ 2,327 $ 429 $ 143 Accumulated benefit obligation $ 2,085 $ 2,316 The funded status of the UK Plan and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): 2018 2017 Plan assets at fair value, end of year $ 1,989 $ 2,368 Benefit obligation, end of year 1,833 2,201 Funded status $ 156 $ 167 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 156 $ 167 The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 2,396 $ 2,761 $ 664 $ 736 Benefit obligation, end of year 2,718 3,006 672 721 Funded status $ (322 ) $ (245 ) $ (8 ) $ 15 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 20 $ 66 $ 5 $ 32 Other current liabilities (13 ) (14 ) — — Other long-term liabilities (329 ) (297 ) (13 ) (17 ) Amounts recognized $ (322 ) $ (245 ) $ (8 ) $ 15
Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]	A reconciliation of the amounts not yet recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss on the Consolidated Balance Sheets, for the years ended December 31 is as follows (in millions): 2018 2017 Balance, beginning of year $ 510 $ 590 Net (gain) loss arising during the year 59 (50 ) Net prior service cost arising during the year 8 — Settlement (22 ) (17 ) Net amortization (45 ) (63 ) Foreign currency exchange rate changes (30 ) 50 Total (30 ) (80 ) Balance, end of year $ 480 $ 510 The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss $ 747 $ 649 $ 50 $ 14 Prior service credit — (3 ) (22 ) (37 ) Regulatory deferrals (1 ) (4 ) 7 7 Total $ 746 $ 642 $ 35 $ (16 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Pension Balance, December 31, 2016 $ 761 $ (13 ) $ 13 $ 761 Net (gain) loss arising during the year (68 ) (29 ) 3 (94 ) Net amortization (28 ) (1 ) 4 (25 ) Total (96 ) (30 ) 7 (119 ) Balance, December 31, 2017 665 (43 ) 20 642 Net loss (gain) arising during the year 114 43 (6 ) 151 Net prior service cost arising during the year — — 2 2 Settlement (21 ) — — (21 ) Net amortization (28 ) — — (28 ) Total 65 43 (4 ) 104 Balance, December 31, 2018 $ 730 $ — $ 16 $ 746 Accumulated Other Regulatory Regulatory Comprehensive Asset Liability Loss Total Other Postretirement Balance, December 31, 2016 $ 55 $ (12 ) $ — $ 43 Net gain arising during the year (52 ) (21 ) — (73 ) Net amortization 7 7 — 14 Total (45 ) (14 ) — (59 ) Balance, December 31, 2017 10 (26 ) — (16 ) Net gain arising during the year 23 14 1 38 Net amortization 11 2 — 13 Total 34 16 1 51 Balance, December 31, 2018 $ 44 $ (10 ) $ 1 $ 35 The portion of the funded status of the UK Plan not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): 2018 2017 Net loss $ 472 $ 510 Prior service cost 8 — Total $ 480 $ 510
Defined Benefit Plans, Amounts To Be Recognized In Following Year [Table Text Block]
Plan Assumptions [Table Text Block]	Assumptions used to determine benefit obligations and net periodic benefit cost were as follows: 2018 2017 2016 Benefit obligations as of December 31: Discount rate 2.90 % 2.60 % 2.70 % Rate of compensation increase 3.55 % 3.45 % 3.00 % Rate of future price inflation 3.05 % 2.95 % 3.00 % Net periodic benefit cost for the years ended December 31: Discount rate 2.60 % 2.70 % 3.70 % Expected return on plan assets 4.90 % 5.00 % 5.60 % Rate of compensation increase 3.45 % 3.00 % 2.90 % Rate of future price inflation 2.95 % 3.00 % 2.90 % Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.06 % 4.21 % 3.57 % 4.01 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rates for cash balance plan 2016 NA NA 2.57 % NA NA NA 2017 NA 2.49 % 2.57 % NA NA NA 2018 3.38 % 3.06 % 2.57 % NA NA NA 2019 3.54 % 3.06 % 3.01 % NA NA NA 2020 3.54 % 2.72 % 3.01 % NA NA NA 2021 3.56 % 2.72 % 3.01 % NA NA NA Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.06 % 4.43 % 3.57 % 4.01 % 4.33 % Expected return on plan assets 6.36 % 6.55 % 6.78 % 6.44 % 6.73 % 7.03 % Rate of compensation increase 2.75 % 2.75 % 2.75 % NA NA NA Interest crediting rate for cash balance plan 3.38 % 2.49 % 2.57 % NA NA NA In establishing its assumption as to the expected return on plan assets, the Company utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. 2018 2017 Assumed healthcare cost trend rates as of December 31: Healthcare cost trend rate assumed for next year 6.80 % 7.10 % Rate that the cost trend rate gradually declines to 5.00 % 5.00 % Year that the rate reaches the rate it is assumed to remain at 2025 2025
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
Expected Benefit Payments [Table Text Block]	Employer contributions to the UK Plan are expected to be £43 million during 2019 . The expected benefit payments to participants in the UK Plan for 2019 through 2023 and for the five years thereafter excluding lump sum settlement elections, using the foreign currency exchange rate as of December 31, 2018 , are summarized below (in millions): 2019 $ 70 2020 71 2021 73 2022 75 2023 77 2024-2028 416 The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Other Pension Postretirement 2019 $ 221 $ 53 2020 224 57 2021 221 55 2022 212 54 2023 212 53 2024-2028 958 243
Allocation of Plan Assets [Table Text Block]	The target allocations (percentage of plan assets) for the UK Plan assets are as follows as of December 31, 2018 : % Debt securities (1) 50-55 Equity securities (1) 35-40 Real estate funds and other 5-15 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds have been allocated based on the underlying investments in debt and equity securities. The target allocations (percentage of plan assets) for the Company's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Other Pension Postretirement % % PacifiCorp: Debt securities (1) 30-43 33-37 Equity securities (1) 48-65 62-66 Limited partnership interests 6-12 1-3 MidAmerican Energy: Debt securities (1) 20-50 25-45 Equity securities (1) 60-80 45-80 Real estate funds 2-8 — Other 0-3 0-5 NV Energy: Debt securities (1) 53-77 40 Equity securities (1) 23-47 60 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of the UK Plan assets, by major category (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 3 $ 59 $ — $ 62 Debt securities: United Kingdom government obligations 891 — — 891 Equity securities: Investment funds (2) — 697 — 697 Real estate funds — — 239 239 Total $ 894 $ 756 $ 239 1,889 Investment funds (2) measured at net asset value 100 Total assets measured at fair value $ 1,989 As of December 31, 2017: Cash equivalents $ 4 $ 30 $ — $ 34 Debt securities: United Kingdom government obligations 870 — — 870 Equity securities: Investment funds (2) — 1,027 — 1,027 Real estate funds — — 230 230 Total $ 874 $ 1,057 $ 230 2,161 Investment funds (2) measured at net asset value 207 Total assets measured at fair value $ 2,368 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 36% and 64% , respectively, for 2018 and 21% and 79% , respectively, for 2017 . The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 8 $ 41 $ 49 Debt securities: United States government obligations 160 — 160 International government obligations — 5 5 Corporate obligations — 373 373 Municipal obligations — 29 29 Agency, asset and mortgage-backed obligations — 123 123 Equity securities: United States companies 492 1 493 International companies 108 — 108 Investment funds (2) 119 — 119 Total assets in the fair value hierarchy $ 887 $ 572 1,459 Investment funds (2) measured at net asset value 792 Limited partnership interests (3) measured at net asset value 104 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 2,396 As of December 31, 2017: Cash equivalents $ 10 $ 76 $ 86 Debt securities: United States government obligations 218 — 218 Corporate obligations — 350 350 Municipal obligations — 16 16 Agency, asset and mortgage-backed obligations — 110 110 Equity securities: United States companies 622 — 622 International companies 136 — 136 Investment funds (2) 83 20 103 Total assets in the fair value hierarchy $ 1,069 $ 572 1,641 Investment funds (2) measured at net asset value 1,019 Limited partnership interests (3) measured at net asset value 63 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 2,761 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 62% and 38% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 73% and 27% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Total As of December 31, 2018: Cash equivalents $ 10 $ 2 $ 12 Debt securities: United States government obligations 13 — 13 Corporate obligations — 42 42 Municipal obligations — 45 45 Agency, asset and mortgage-backed obligations — 30 30 Equity securities: United States companies 158 — 158 International companies 6 — 6 Investment funds 202 1 203 Total assets in the fair value hierarchy $ 389 $ 120 509 Investment funds measured at net asset value 149 Limited partnership interests measured at net asset value 6 Total assets measured at fair value $ 664 As of December 31, 2017: Cash equivalents $ 11 $ 3 $ 14 Debt securities: United States government obligations 20 — 20 Corporate obligations — 36 36 Municipal obligations — 46 46 Agency, asset and mortgage-backed obligations — 29 29 Equity securities: United States companies 185 — 185 International companies 8 — 8 Investment funds (2) 219 1 220 Total assets in the fair value hierarchy $ 443 $ 115 558 Investment funds (2) measured at net asset value 174 Limited partnership interests (3) measured at net asset value 4 Total assets measured at fair value $ 736 (1) Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 68% and 32% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 79% and 21% , respectively, for 2018 and 73% and 27% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ 1 $ 91 $ 108 $ (52 ) $ 148 Interest rate derivatives 1 13 10 — 24 Mortgage loans held for sale — 468 — — 468 Money market mutual funds (2) 409 — — — 409 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 1,441 — — — 1,441 Investment funds 128 — — — 128 $ 2,423 $ 625 $ 118 $ (52 ) $ 3,114 Liabilities: Commodity derivatives $ (1 ) $ (180 ) $ (9 ) $ 111 $ (79 ) Interest rate derivatives — (32 ) — — (32 ) $ (1 ) $ (212 ) $ (9 ) $ 111 $ (111 ) As of December 31, 2017: Assets: Commodity derivatives $ 1 $ 42 $ 104 $ (29 ) $ 118 Interest rate derivatives — 15 9 — 24 Mortgage loans held for sale — 465 — — 465 Money market mutual funds (2) 685 — — — 685 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 1,968 — — — 1,968 Investment funds 178 — — — 178 $ 3,296 $ 565 $ 113 $ (29 ) $ 3,945 Liabilities: Commodity derivatives $ (3 ) $ (167 ) $ (10 ) $ 105 $ (75 ) Interest rate derivatives — (8 ) — — (8 ) $ (3 ) $ (175 ) $ (10 ) $ 105 $ (83 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]	The following table reconciles the beginning and ending balances of the UK Plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions): Real Estate Funds 2018 2017 2016 Beginning balance $ 230 $ 105 $ 204 Actual return on plan assets still held at period end 23 6 10 Purchases (sales) — 104 (80 ) Foreign currency exchange rate changes (14 ) 15 (29 ) Ending balance $ 239 $ 230 $ 105
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ — $ — $ 4 $ 2 $ 2 $ 2 Interest cost 43 49 54 11 14 15 Expected return on plan assets (72 ) (72 ) (75 ) (21 ) (21 ) (21 ) Settlement 22 — — — — — Net amortization 13 14 34 (6 ) (6 ) (5 ) Net periodic benefit cost (credit) $ 6 $ (9 ) $ 17 $ (14 ) $ (11 ) $ (9 )
Changes in Fair Value of Plan Assets [Table Text Block]	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 1,111 $ 999 $ 332 $ 302 Employer contributions 4 54 1 1 Participant contributions — — 5 7 Actual return on plan assets (52 ) 166 (16 ) 49 Settlement (52 ) — — — Benefits paid (69 ) (108 ) (25 ) (27 ) Plan assets at fair value, end of year $ 942 $ 1,111 $ 297 $ 332
Changes in Projected Benefit Obligations [Table Text Block]	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 1,251 $ 1,276 $ 331 $ 358 Service cost — — 2 2 Interest cost 43 49 11 14 Participant contributions — — 5 7 Actuarial (gain) loss (68 ) 34 (26 ) (23 ) Settlement (52 ) — — Benefits paid (69 ) (108 ) (25 ) (27 ) Benefit obligation, end of year $ 1,105 $ 1,251 $ 298 $ 331 Accumulated benefit obligation, end of year $ 1,105 $ 1,251
Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 942 $ 1,111 $ 297 $ 332 Less - Benefit obligation, end of year 1,105 1,251 298 331 Funded status $ (163 ) $ (140 ) $ (1 ) $ 1 Amounts recognized on the Consolidated Balance Sheets: Other assets $ 3 $ 5 $ — $ 1 Other current liabilities (4 ) (4 ) — — Other long-term liabilities (162 ) (141 ) (1 ) — Amounts recognized $ (163 ) $ (140 ) $ (1 ) $ 1
Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss (gain) $ 461 $ 442 $ (2 ) $ (12 ) Prior service credit — — — (6 ) Regulatory deferrals (1 ) (4 ) 7 7 Total $ 460 $ 438 $ 5 $ (11 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Accumulated Other Regulatory Comprehensive Asset Loss Total Pension Balance, December 31, 2016 $ 491 $ 20 $ 511 Net (gain) loss arising during the year (60 ) 1 (59 ) Net amortization (13 ) (1 ) (14 ) Total (73 ) — (73 ) Balance, December 31, 2017 418 20 438 Net loss (gain) arising during the year 59 (2 ) 57 Net amortization (12 ) (1 ) (13 ) Settlement (22 ) — (22 ) Total 25 (3 ) 22 Balance, December 31, 2018 $ 443 $ 17 $ 460 Regulatory Asset (Liability) Other Postretirement Balance, December 31, 2016 $ 34 Net gain arising during the year (51 ) Net amortization 6 Total (45 ) Balance, December 31, 2017 (11 ) Net loss arising during the year 10 Net amortization 6 Total 16 Balance, December 31, 2018 $ 5
Defined Benefit Plans, Amounts To Be Recognized In Following Year [Table Text Block]
Plan Assumptions [Table Text Block]	ssumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.05 % 4.25 % 3.60 % 4.05 % Rate of compensation increase N/A N/A N/A N/A N/A N/A Interest crediting rates for cash balance plan (1)(2)(3) 3.40 % 1.61 % 2.06 % N/A N/A N/A Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.05 % 4.40 % 3.60 % 4.05 % 4.35 % Expected return on plan assets 7.00 7.25 7.50 6.86 7.25 7.50 Rate of compensation increase N/A N/A 2.75 N/A N/A N/A (1) 2018 Cash Balance Interest Crediting Rate assumption is 3.40% for 2019 and all future years for nonunion participants and 3.15% for 2019-2020 and 3.25% for 2021+ for union participants. (2) 2017 Cash Balance Interest Crediting Rate assumption was 2.26% for 2018-2019 and 1.60% for 2020+ for nonunion participants and 2.78% for 2018-2019 and 2.60% for 2020+ for union participants. (3) 2016 Cash Balance Interest Crediting Rate assumption was 1.44% for 2017-2018 and 2.05% for 2019+ for nonunion participants and 2.35% for 2017-2018 and 3.05% for 2019+ for union participants. In establishing its assumption as to the expected return on plan assets, PacifiCorp utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. As a result of a plan amendment effective on January 1, 2017, the benefit obligation for the Retirement Plan is no longer affected by future increases in compensation. As a result of a labor settlement reached with UMWA in December 2014, the benefit obligation for the other postretirement plan is no longer affected by healthcare cost trends.
Expected Benefit Payments [Table Text Block]	The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Pension Other Postretirement 2019 $ 105 $ 24 2020 102 26 2021 98 23 2022 92 22 2023 88 21 2024-2028 369 95
Allocation of Plan Assets [Table Text Block]	The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Pension (1) Other Postretirement (1) % % Debt securities (2) 30 - 43 33 - 37 Equity securities (2) 48 - 65 62 - 66 Limited partnership interests 6 - 12 1 - 3 (1) PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts. (2) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements Level 1 (1) Level 2 (1) Level 3 (1) Total As of December 31, 2018: Cash equivalents $ — $ 11 $ — $ 11 Debt securities: United States government obligations 4 — — 4 International government obligations — 1 — 1 Corporate obligations — 88 — 88 Municipal obligations — 10 — 10 Agency, asset and mortgage-backed obligations — 43 — 43 Equity securities: United States companies 327 — — 327 International companies 15 — — 15 Investment funds (2) 54 — — 54 Total assets in the fair value hierarchy $ 400 $ 153 $ — 553 Investment funds (2) measured at net asset value 285 Limited partnership interests (3) measured at net asset value 104 Investments at fair value $ 942 As of December 31, 2017: Cash equivalents $ — $ 43 $ — $ 43 Debt securities: United States government obligations 45 — — 45 Corporate obligations — 60 — 60 Municipal obligations — 9 — 9 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 416 — — 416 International companies 22 — — 22 Total assets in the fair value hierarchy $ 483 $ 149 $ — 632 Investment funds (2) measured at net asset value 416 Limited partnership interests (3) measured at net asset value 63 Investments at fair value $ 1,111 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 55% and 45% respectively, for 2018 and 60% and 40% , respectively, for 2017 , and are invested in United States and international securities of approximately 68% and 32% , respectively, for 2018 and 57% and 43% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions): Input Levels for Fair Value Measurements Level 1(1) Level 2(1) Level 3(1) Total As of December 31, 2018: Cash and cash equivalents $ 4 $ 1 $ — $ 5 Debt securities: United States government obligations 3 — — 3 Corporate obligations — 23 — 23 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 17 — 17 Equity securities: United States companies 83 — — 83 International companies 4 — — 4 Investment funds (2) 38 — — 38 Total assets in the fair value hierarchy 132 43 — 175 Investment funds (2) measured at net asset value 116 Limited partnership interests (3) measured at net asset value 6 Investments at fair value $ 297 As of December 31, 2017: Cash and cash equivalents $ 4 $ 3 $ — $ 7 Debt securities: United States government obligations 11 — — 11 Corporate obligations — 16 — 16 Municipal obligations — 2 — 2 Agency, asset and mortgage-backed obligations — 16 — 16 Equity securities: United States companies 98 — — 98 International companies 6 — — 6 Investment funds (2) 32 — — 32 Total assets in the fair value hierarchy 151 37 — 188 Investment funds (2) measured at net asset value 140 Limited partnership interests (3) measured at net asset value 4 Investments at fair value $ 332 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41% , respectively, for 2018 and 63% and 37% , respectively, for 2017 , and are invested in United States and international securities of approximately 90% and 10% , respectively, for 2018 and 77% and 23% , respectively, for 2017 . (3) Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital. The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 51 $ — $ (23 ) $ 28 Money market mutual funds (2) 69 — — — 69 Investment funds 24 — — — 24 $ 93 $ 51 $ — $ (23 ) $ 121 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 82 $ (66 ) As of December 31, 2017: Assets: Commodity derivatives $ — $ 13 $ — $ (4 ) $ 9 Money market mutual funds (2) 21 — — — 21 Investment funds 21 — — — 21 $ 42 $ 13 $ — $ (4 ) $ 51 Liabilities - Commodity derivatives $ — $ (117 ) $ — $ 78 $ (39 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $74 million as of December 31, 2018 and 2017 , respectively. (2) Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Schedule of Multiemployer Plans [Table Text Block]	The following table presents PacifiCorp's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions): PPA zone status or plan funded status percentage for plan years beginning July 1, Contributions (1) Plan name Employer Identification Number 2018 2017 2016 Funding improvement plan Surcharge imposed under PPA (1) 2018 2017 2016 Year contributions to plan exceeded more than 5% of total contributions (2) Local 57 Trust Fund 87-0640888 At least 80% At least 80% At least 80% None None $ 7 $ 7 $ 8 2016, 2015, 2014 (1) PacifiCorp's minimum contributions to the plan are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements, subject to ERISA minimum funding requirements. (2) For the Local 57 Trust Fund, information is for plan years beginning July 1, 2016, 2015 and 2014. Information for the plan year beginning July 1, 2017 is not yet available.
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 9 $ 9 $ 10 $ 5 $ 5 $ 5 Interest cost 28 31 34 8 9 10 Expected return on plan assets (44 ) (44 ) (44 ) (13 ) (14 ) (13 ) Settlement (1 ) — — — — — Net amortization 2 2 2 (4 ) (4 ) (4 ) Net periodic benefit (credit) cost $ (6 ) $ (2 ) $ 2 $ (4 ) $ (4 ) $ (2 )
Changes in Fair Value of Plan Assets [Table Text Block]	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, beginning of year $ 745 $ 684 $ 277 $ 252 Employer contributions 7 7 1 1 Participant contributions — — 1 1 Actual return on plan assets (39 ) 114 (17 ) 36 Settlement (37 ) — — — Benefits paid (32 ) (60 ) (15 ) (13 ) Plan assets at fair value, end of year $ 644 $ 745 $ 247 $ 277
Changes in Projected Benefit Obligations [Table Text Block]	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2018 2017 Benefit obligation, beginning of year $ 799 $ 773 $ 246 $ 233 Service cost 9 9 5 5 Interest cost 28 31 8 9 Participant contributions — — 1 1 Actuarial (gain) loss (33 ) 46 (3 ) 11 Plan amendments 2 — — — Settlement (37 ) — — — Benefits paid (32 ) (60 ) (15 ) (13 ) Benefit obligation, end of year $ 736 $ 799 $ 242 $ 246 Accumulated benefit obligation, end of year $ 733 $ 790
Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Plan assets at fair value, end of year $ 644 $ 745 $ 247 $ 277 Less - Benefit obligation, end of year 736 799 242 246 Funded status $ (92 ) $ (54 ) $ 5 $ 31 Amounts recognized on the Balance Sheets: Other assets $ 17 $ 66 $ 5 $ 31 Other current liabilities (7 ) (8 ) — — Other liabilities (102 ) (112 ) — — Amounts recognized $ (92 ) $ (54 ) $ 5 $ 31
Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions): Pension Other Postretirement 2018 2017 2018 2017 Net loss (gain) $ 40 $ (11 ) $ 48 $ 23 Prior service cost (credit) 1 1 (20 ) (25 ) Total $ 41 $ (10 ) $ 28 $ (2 ) A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2018 and 2017 is as follows (in millions): Regulatory Asset Regulatory Liability Receivables (Payables) with Affiliates Total Pension Balance, December 31, 2016 $ 22 $ (12 ) $ 6 $ 16 Net loss (gain) arising during the year 4 (29 ) 1 (24 ) Net amortization (2 ) — — (2 ) Total 2 (29 ) 1 (26 ) Balance, December 31, 2017 24 (41 ) 7 (10 ) Net loss arising during the year 2 41 9 52 Net amortization (2 ) — — (2 ) Settlement 1 — — 1 Total 1 41 9 51 Balance, December 31, 2018 $ 25 $ — $ 16 $ 41 Regulatory Asset Receivables (Payables) with Affiliates Total Other Postretirement Balance, December 31, 2016 $ 18 $ (13 ) $ 5 Net gain arising during the year (7 ) (4 ) (11 ) Net amortization 3 1 4 Total (4 ) (3 ) (7 ) Balance, December 31, 2017 14 (16 ) (2 ) Net loss arising during the year 20 6 26 Net amortization 3 1 4 Total 23 7 30 Balance, December 31, 2018 $ 37 $ (9 ) $ 28
Plan Assumptions [Table Text Block]	Assumptions used to determine benefit obligations and net periodic benefit cost were as follows: Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Benefit obligations as of December 31: Discount rate 4.25 % 3.60 % 4.10 % 4.15 % 3.50 % 3.90 % Rate of compensation increase 2.75 % 2.75 % 2.75 % N/A N/A N/A Interest crediting rates for cash balance plan 2016 N/A N/A 1.18 % N/A N/A N/A 2017 N/A 1.44 % 1.44 % N/A N/A N/A 2018 2.26 % 2.26 % 1.44 % N/A N/A N/A 2019 3.40 % 2.26 % 2.10 % N/A N/A N/A 2020 3.40 % 1.60 % 2.10 % N/A N/A N/A 2021 and beyond 3.40 % 1.60 % 2.10 % N/A N/A N/A Net periodic benefit cost for the years ended December 31: Discount rate 3.60 % 4.10 % 4.50 % 3.50 % 3.90 % 4.25 % Expected return on plan assets (1) 6.50 % 6.75 % 7.00 % 6.25 % 6.50 % 6.75 % Rate of compensation increase 2.75 % 2.75 % 2.75 % N/A N/A N/A Interest crediting rates for cash balance plan 2.26 % 1.44 % 1.18 % N/A N/A N/A (1) Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 4.13% for 2018 , and 4.81% for 2017 , and 5.00% for 2016 . In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. 2018 2017 Assumed healthcare cost trend rates as of December 31: Healthcare cost trend rate assumed for next year 6.80 % 7.10 % Rate that the cost trend rate gradually declines to 5.00 % 5.00 % Year that the rate reaches the rate it is assumed to remain at 2025 2025
Expected Benefit Payments [Table Text Block]	Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2019 through 2023 and for the five years thereafter are summarized below (in millions): Projected Benefit Payments Pension Other Postretirement 2019 $ 61 $ 19 2020 62 21 2021 61 22 2022 60 22 2023 58 22 2024-2028 262 102
Allocation of Plan Assets [Table Text Block]	The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2018 : Pension Other Postretirement % % Debt securities (1) 20-50 25-45 Equity securities (1) 60-80 45-80 Real estate funds 2-8 — Other 0-3 0-5 (1) For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ — $ 20 $ — $ 20 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 63 — 63 Municipal obligations — 6 — 6 Agency, asset and mortgage-backed obligations — 37 — 37 Equity securities: United States companies 111 — — 111 International companies 35 — — 35 Investment funds (2) 65 — — 65 Total assets in the hierarchy $ 217 $ 126 $ — — Investment funds (2) measured at net asset value 260 Real estate funds measured at net asset value 41 Total assets measured at fair value $ 644 As of December 31, 2017: Cash equivalents $ — $ 17 $ — $ 17 Debt securities: United States government obligations 21 — — 21 Corporate obligations — 59 — 59 Municipal obligations — 7 — 7 Agency, asset and mortgage-backed obligations — 33 — 33 Equity securities: United States companies 137 — — 137 International companies 44 — — 44 Investment funds (2) 74 — — 74 Total assets in the hierarchy $ 276 $ 116 $ — 392 Investment funds (2) measured at net asset value 315 Real estate funds measured at net asset value 38 Total assets measured at fair value $ 745 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35% , respectively, for 2018 and 69% and 31% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 74% and 26% , respectively, for 2018 and 72% and 28% , respectively, for 2017 . The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions): Input Levels for Fair Value Measurements (1) Level 1 Level 2 Level 3 Total As of December 31, 2018: Cash equivalents $ 5 $ — $ — $ 5 Debt securities: United States government obligations 6 — — 6 Corporate obligations — 12 — 12 Municipal obligations — 43 — 43 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 73 — — 73 Investment funds (2) 96 — — 96 Total assets measured at fair value $ 180 $ 67 $ — $ 247 As of December 31, 2017: Cash equivalents $ 6 $ — $ — $ 6 Debt securities: United States government obligations 5 — — 5 Corporate obligations — 14 — 14 Municipal obligations — 44 — 44 Agency, asset and mortgage-backed obligations — 12 — 12 Equity securities: United States companies 84 — — 84 Investment funds (2) 112 — — 112 Total assets measured at fair value $ 207 $ 70 $ — $ 277 (1) Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy. (2) Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22% , respectively, for 2018 and 81% and 19% , respectively, for 2017 . Additionally, these funds are invested in United States and international securities of approximately 41% and 59% , respectively, for 2018 and 42% and 58% , respectively, for 2017 . The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2018: Assets: Commodity derivatives $ — $ 4 $ 2 $ (3 ) $ 3 Money market mutual funds (2) 2 — — — 2 Debt securities: United States government obligations 187 — — — 187 International government obligations — 4 — — 4 Corporate obligations — 46 — — 46 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 256 — — — 256 International companies 6 — — — 6 Investment funds 10 — — — 10 $ 461 $ 57 $ 2 $ (3 ) $ 517 Liabilities: Commodity derivatives $ — $ (4 ) $ (2 ) $ 3 $ (3 ) Interest rate derivatives (3) — (19 ) — — (19 ) $ — $ (23 ) $ (2 ) $ 3 $ (22 ) As of December 31, 2017 Assets: Commodity derivatives $ — $ 3 $ 4 $ (2 ) $ 5 Money market mutual funds (2) 133 — — — 133 Debt securities: United States government obligations 176 — — — 176 International government obligations — 5 — — 5 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Equity securities: United States companies 288 — — — 288 International companies 7 — — — 7 Investment funds 15 — — — 15 $ 619 $ 46 $ 4 $ (2 ) $ 667 Liabilities - commodity derivatives $ — $ (9 ) $ (1 ) $ 2 $ (8 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $- million as of December 31, 2018 and 2017 . (2) Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions): 2018 2017 2016 Pension costs $ 3 $ 4 $ 4 Other postretirement costs (2 ) (3 ) (1 )

Retirement Plan and Postretir_2

Retirement Plan and Postretirement Benefits Retirement Plan and Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions): Pension Other Postretirement 2018 2017 2016 2018 2017 2016 Service cost $ 21 $ 24 $ 29 $ 9 $ 9 $ 9 Interest cost 105 116 126 24 29 31 Expected return on plan assets (164 ) (160 ) (160 ) (41 ) (40 ) (41 ) Settlement 21 — — — — — Net amortization 28 25 46 (13 ) (14 ) (12 ) Net periodic benefit cost (credit) $ 11 $ 5 $ 41 $ (21 ) $ (16 ) $ (13 ) Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions): 2018 2017 2016 Service cost $ 19 $ 23 $ 20 Interest cost 56 58 72 Expected return on plan assets (101 ) (100 ) (110 ) Settlement 44 31 — Net amortization 45 63 44 Net periodic benefit cost $ 63 $ 75 $ 26
Nevada Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following as of December 31 (in millions): 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (26 ) $ (23 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (10 ) Other Postretirement Plans - Other long-term liabilities (1 ) 1
Sierra Pacific Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	Amounts payable to NV Energy are included on the Balance Sheets and consist of the following as of December 31 (in millions): 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (19 ) $ (2 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (7 ) (8 ) Other Postretirement Plans - Other long-term liabilities (13 ) (20 )

Asset Retirement Oblilgations (

Asset Retirement Oblilgations (Tables)	12 Months Ended
	Dec. 31, 2018
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations By Type [Table Text Block]	The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Fossil fuel facilities $ 371 $ 380 Quad Cities Station 345 342 Wind generating facilities 174 138 Offshore pipeline facilities 33 32 Solar generating facilities 20 19 Other 42 43 Total asset retirement obligations $ 985 $ 954 Quad Cities Station nuclear decommissioning trust funds $ 504 $ 515
Asset Retirement Obligation Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 954 $ 954 Change in estimated costs 10 (18 ) Additions 28 21 Retirements (45 ) (45 ) Accretion 38 42 Ending balance $ 985 $ 954 Reflected as: Other current liabilities $ 43 $ 60 Other long-term liabilities 942 894 Total ARO liability $ 985 $ 954
PacifiCorp [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 215 $ 215 Change in estimated costs 9 (8 ) Additions — 6 Retirements (5 ) (6 ) Accretion 8 8 Ending balance $ 227 $ 215 Reflected as: Other current liabilities $ 21 $ 25 Other long-term liabilities 206 190 $ 227 $ 215
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations By Type [Table Text Block]	The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Quad Cities Station $ 345 $ 342 Fossil-fueled generating facilities 93 113 Wind-powered generating facilities 123 103 Other 1 1 Total asset retirement obligations $ 562 $ 559 Quad Cities Station nuclear decommissioning trust funds (1) $ 504 $ 515 (1) Refer to Note 6 for a discussion of the Quad Cities Station nuclear decommissioning trust funds.
Asset Retirement Obligation Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 559 $ 567 Change in estimated costs (10 ) (14 ) Additions 17 8 Retirements (28 ) (26 ) Accretion 24 24 Ending balance $ 562 $ 559 Reflected as: Other current liabilities $ 10 $ 31 Asset retirement obligations 552 528 $ 562 $ 559
Nevada Power Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations By Type [Table Text Block]	The following table presents Nevada Power 's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Waste water remediation $ 37 $ 39 Evaporative ponds and dry ash landfills 12 11 Asbestos 5 3 Solar 2 3 Other 27 24 Total asset retirement obligations $ 83 $ 80
Asset Retirement Obligation Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of Nevada Power 's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 80 $ 83 Change in estimated costs 11 6 Retirements (11 ) (13 ) Accretion 3 4 Ending balance $ 83 $ 80 Reflected as: Other current liabilities $ 13 $ 4 Other long-term liabilities 70 76 $ 83 $ 80
Sierra Pacific Power Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations By Type [Table Text Block]	The following table presents Sierra Pacific 's ARO liabilities by asset type as of December 31 (in millions): 2018 2017 Asbestos $ 5 $ 5 Evaporative ponds and dry ash landfills 2 2 Other 3 3 Total asset retirement obligations $ 10 $ 10
Asset Retirement Obligation Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of Sierra Pacific 's ARO liabilities for the years ended December 31 (in millions): 2018 2017 Beginning balance $ 10 $ 10 Retirements — — Ending balance $ 10 $ 10 Reflected as: Other current liabilities $ — $ — Other long-term liabilities 10 10 $ 10 $ 10

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule	The Company has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2018 are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 2,215 $ 1,659 $ 1,380 $ 1,174 $ 1,047 $ 11,155 $ 18,630 Construction commitments 2,330 587 52 — — — 2,969 Operating leases and easements 197 177 160 139 111 1,738 2,522 Maintenance, service and other contracts 306 344 303 277 241 1,358 2,829 $ 5,048 $ 2,767 $ 1,895 $ 1,590 $ 1,399 $ 14,251 $ 26,950
PacifiCorp [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule	PacifiCorp has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2018 are as follows (in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Contract type: Purchased electricity contracts - commercially operable $ 317 $ 194 $ 155 $ 152 $ 145 $ 1,522 $ 2,485 Purchased electricity contracts - non-commercially operable 13 21 48 49 49 797 977 Fuel contracts 732 648 521 326 268 976 3,471 Construction commitments 888 559 2 — — — 1,449 Transmission 108 95 80 69 63 427 842 Operating leases and easements 7 6 7 6 5 90 121 Maintenance, service and other contracts 52 25 26 16 8 81 208 Total commitments $ 2,117 $ 1,548 $ 839 $ 618 $ 538 $ 3,893 $ 9,553
MidAmerican Energy Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule	MidAmerican Energy had the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31, 2018 , are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Coal and natural gas for generation $ 96 $ 21 $ 17 $ 13 $ 5 $ — $ 152 Electric capacity and transmission 29 28 26 15 7 36 141 Natural gas contracts for gas operations 145 76 59 45 23 30 378 Construction commitments 1,299 28 50 — — — 1,377 Easements and operating leases 27 29 29 30 30 1,078 1,223 Maintenance and services contracts 118 196 147 143 134 224 962 $ 1,714 $ 378 $ 328 $ 246 $ 199 $ 1,368 $ 4,233
Nevada Power Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule	Nevada Power has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31 , 2018 are as follows (in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 612 $ 459 $ 379 $ 383 $ 386 $ 4,925 $ 7,144 Fuel and capacity contract commitments (not commercially operable) — 1 6 40 40 982 1,069 Operating leases and easements 10 7 7 8 7 59 98 Maintenance, service and other contracts 46 41 44 37 23 26 217 Total commitments $ 668 $ 508 $ 436 $ 468 $ 456 $ 5,992 $ 8,528
Sierra Pacific Power Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule	Sierra Pacific has the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31 , 2018 are as follows (in millions): 2024 and 2019 2020 2021 2022 2023 Thereafter Total Contract type: Fuel, capacity and transmission contract commitments $ 204 $ 154 $ 117 $ 81 $ 61 $ 502 $ 1,119 Fuel and capacity contract commitments (not commercially operable) 8 16 28 58 58 1,394 1,562 Operating leases and easements 4 4 4 3 2 56 73 Maintenance, service and other contracts 8 7 6 6 2 1 30 Total commitments $ 224 $ 181 $ 155 $ 148 $ 123 $ 1,953 $ 2,784

Components of Accumulated Oth_2

Components of Accumulated Other Comprehensive Loss, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of accumulated other comprehensive income (loss)
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table shows the change in accumulated other comprehensive loss attributable to BHE shareholders by each component of other comprehensive income (loss), net of applicable income taxes, for the year ended December 31 (in millions): Unrecognized Foreign Unrealized Unrealized AOCI Amounts on Currency Gains on Gains on Attributable Retirement Translation Marketable Cash Flow To BHE Benefits Adjustment Securities Hedges Shareholders, Net Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive (loss) income (9 ) (583 ) (30 ) 19 (603 ) Balance, December 31, 2016 (447 ) (1,675 ) 585 26 (1,511 ) Other comprehensive income 64 546 500 3 1,113 Balance, December 31, 2017 (383 ) (1,129 ) 1,085 29 (398 ) Adoption of ASU 2016-01 — — (1,085 ) — (1,085 ) Other comprehensive income (loss) 25 (494 ) — 7 (462 ) Balance, December 31, 2018 $ (358 ) $ (1,623 ) $ — $ 36 $ (1,945 )
MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table shows the change in accumulated other comprehensive loss by each component of other comprehensive income, net of applicable income taxes, for the year ended December 31, 2016 (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 3 — 3 Dividend of unregulated retail services business — 27 27 Balance, December 31, 2016 $ — $ — $ —

Noncontrolling Interests Noncon

Noncontrolling Interests Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2018
MidAmerican Funding, LLC and Subsidiaries [Domain]
Noncontrolling Interest [Line Items]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Other, net, as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions): 2018 2017 2016 Non-service cost components of postretirement employee benefit plans $ 21 $ 18 $ 15 Corporate-owned life insurance income 6 13 8 Gain on redemption of auction rate securities — — 5 Gains on sales of assets and other investments 1 1 3 Loss on debt tender offer — (29 ) — Interest income and other, net 3 6 3 Total $ 31 $ 9 $ 34 Refer to Note 8 for information regarding the debt tender offer.

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Information related to the Company's reportable segments is shown below (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: PacifiCorp $ 5,026 $ 5,237 $ 5,201 MidAmerican Funding 3,053 2,846 2,631 NV Energy 3,039 3,015 2,895 Northern Powergrid 1,020 949 995 BHE Pipeline Group 1,203 993 978 BHE Transmission 710 699 502 BHE Renewables 908 838 743 HomeServices 4,214 3,443 2,801 BHE and Other (1) 614 594 676 Total operating revenue $ 19,787 $ 18,614 $ 17,422 Depreciation and amortization: PacifiCorp $ 979 $ 796 $ 783 MidAmerican Funding 609 500 479 NV Energy 456 422 421 Northern Powergrid 250 214 200 BHE Pipeline Group 126 159 206 BHE Transmission 247 239 241 BHE Renewables 268 251 230 HomeServices 51 66 31 BHE and Other (1) (2 ) (1 ) — Total depreciation and amortization $ 2,984 $ 2,646 $ 2,591 Operating income: PacifiCorp $ 1,051 $ 1,440 $ 1,429 MidAmerican Funding 550 544 551 NV Energy 607 766 774 Northern Powergrid 486 488 500 BHE Pipeline Group 525 473 455 BHE Transmission 313 322 92 BHE Renewables 325 316 256 HomeServices 214 214 212 BHE and Other (1) 1 (41 ) (22 ) Total operating income 4,072 4,522 4,247 Interest expense (1,838 ) (1,841 ) (1,854 ) Capitalized interest 61 45 139 Allowance for equity funds 104 76 158 Interest and dividend income 113 111 120 (Losses) gains on marketable securities, net (538 ) 14 10 Other, net (9 ) (420 ) 30 Total income before income tax (benefit) expense and equity income (loss) $ 1,965 $ 2,507 $ 2,850 Years Ended December 31, 2018 2017 2016 Interest expense: PacifiCorp $ 384 $ 381 $ 381 MidAmerican Funding 247 237 218 NV Energy 224 233 250 Northern Powergrid 141 133 136 BHE Pipeline Group 43 43 50 BHE Transmission 167 169 153 BHE Renewables 201 204 198 HomeServices 23 7 2 BHE and Other (1) 408 434 466 Total interest expense $ 1,838 $ 1,841 $ 1,854 Income tax (benefit) expense: PacifiCorp $ 5 $ 362 $ 341 MidAmerican Funding (262 ) (202 ) (139 ) NV Energy 100 221 200 Northern Powergrid 61 57 22 BHE Pipeline Group 119 170 163 BHE Transmission 7 (124 ) 26 BHE Renewables (2) (158 ) (795 ) (32 ) HomeServices 52 49 81 BHE and Other (1) (507 ) (292 ) (259 ) Total income tax (benefit) expense $ (583 ) $ (554 ) $ 403 Capital expenditures: PacifiCorp $ 1,257 $ 769 $ 903 MidAmerican Funding 2,332 1,776 1,637 NV Energy 503 456 529 Northern Powergrid 566 579 579 BHE Pipeline Group 427 286 226 BHE Transmission 270 334 466 BHE Renewables 817 323 719 HomeServices 47 37 20 BHE and Other 22 11 11 Total capital expenditures $ 6,241 $ 4,571 $ 5,090 As of December 31, 2018 2017 2016 Property, plant and equipment, net: PacifiCorp $ 19,591 $ 19,203 $ 19,162 MidAmerican Funding 16,171 14,221 12,835 NV Energy 9,852 9,770 9,825 Northern Powergrid 6,007 6,075 5,148 BHE Pipeline Group 4,904 4,587 4,423 BHE Transmission 5,824 6,330 5,810 BHE Renewables 6,155 5,637 5,302 HomeServices 141 117 78 BHE and Other (50 ) (69 ) (74 ) Total property, plant and equipment, net $ 68,595 $ 65,871 $ 62,509 Total assets: PacifiCorp $ 23,478 $ 23,086 $ 23,563 MidAmerican Funding 20,029 18,444 17,571 NV Energy 14,119 13,903 14,320 Northern Powergrid 7,427 7,565 6,433 BHE Pipeline Group 5,511 5,134 5,144 BHE Transmission 8,424 9,009 8,378 BHE Renewables 8,666 7,687 7,010 HomeServices 2,797 2,722 1,776 BHE and Other 1,738 2,658 1,245 Total assets $ 92,189 $ 90,208 $ 85,440 Years Ended December 31, 2018 2017 2016 Operating revenue by country: United States $ 18,014 $ 16,916 $ 15,895 United Kingdom 1,017 948 995 Canada 710 699 506 Philippines and other 46 51 26 Total operating revenue by country $ 19,787 $ 18,614 $ 17,422 Income before income tax (benefit) expense and equity income (loss) by country: United States $ 1,425 $ 1,927 $ 2,264 United Kingdom 307 313 382 Canada 155 167 135 Philippines and other 78 100 69 Total income before income tax (benefit) expense and equity (loss) income by country: $ 1,965 $ 2,507 $ 2,850 As of December 31, 2018 2017 2016 Property, plant and equipment, net by country: United States $ 56,870 $ 53,579 $ 51,671 United Kingdom 5,895 5,953 5,020 Canada 5,817 6,323 5,803 Philippines and other 13 16 15 Total property, plant and equipment, net by country $ 68,595 $ 65,871 $ 62,509 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate to other corporate entities, including MidAmerican Energy Services, LLC, corporate functions and intersegment eliminations. (2) Income tax (benefit) expense includes the tax attributes of disregarded entities that are not required to pay income taxes and the earnings of which are taxable directly to BHE.
Schedule of Goodwill [Table Text Block]	The following table shows the change in the carrying amount of goodwill by reportable segment for the years ended December 31, 2018 and 2017 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 930 $ 75 $ 1,470 $ 95 $ 840 $ — $ 9,010 Acquisitions — — — — — — — 508 — 508 Foreign currency translation — — — 61 — 101 — — — 162 Other — — — — (2 ) — — — — (2 ) December 31, 2017 1,129 2,102 2,369 991 73 1,571 95 1,348 — 9,678 Acquisitions — — — — — — — 79 — 79 Foreign currency translation — — — (39 ) — (123 ) — — — (162 ) December 31, 2018 $ 1,129 $ 2,102 $ 2,369 $ 952 $ 73 $ 1,448 $ 95 $ 1,427 $ — $ 9,595
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 2,283 $ 2,108 $ 1,985 Regulated natural gas 754 719 637 Other 12 10 3 Total operating revenue $ 3,049 $ 2,837 $ 2,625 Depreciation and amortization: Regulated electric $ 565 $ 458 $ 436 Regulated natural gas 44 42 43 Total depreciation and amortization $ 609 $ 500 $ 479 Years Ended December 31, 2018 2017 2016 Operating income: Regulated electric $ 469 $ 472 $ 486 Regulated natural gas 81 72 64 Other 1 (1 ) — Total operating income $ 551 $ 543 $ 550 Interest expense: Regulated electric $ 208 $ 196 $ 178 Regulated natural gas 19 18 18 Total interest expense $ 227 $ 214 $ 196 Income tax (benefit) expense: Regulated electric $ (273 ) $ (212 ) $ (156 ) Regulated natural gas 16 29 22 Other 2 — 2 Total income tax (benefit) expense $ (255 ) $ (183 ) $ (132 ) Net income: Regulated electric $ 628 $ 570 $ 512 Regulated natural gas 54 35 32 Other — — (2 ) Net income $ 682 $ 605 $ 542 Years Ended December 31, 2018 2017 2016 Capital expenditures: Regulated electric $ 2,223 $ 1,686 $ 1,564 Regulated natural gas 109 87 72 Total capital expenditures $ 2,332 $ 1,773 $ 1,636 As of December 31, 2018 2017 2016 Total assets: Regulated electric $ 16,511 $ 14,914 $ 14,113 Regulated natural gas 1,406 1,403 1,345 Other 3 1 1 Total assets $ 17,920 $ 16,318 $ 15,459
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 2,283 $ 2,108 $ 1,985 Regulated natural gas 754 719 637 Other 16 19 9 Total operating revenue $ 3,053 $ 2,846 $ 2,631 Depreciation and amortization: Regulated electric $ 565 $ 458 $ 436 Regulated natural gas 44 42 43 Total depreciation and amortization $ 609 $ 500 $ 479 Operating income: Regulated electric $ 469 $ 472 $ 486 Regulated natural gas 81 72 64 Other — — 1 Total operating income $ 550 $ 544 $ 551 Interest expense: Regulated electric $ 208 $ 196 $ 178 Regulated natural gas 19 18 18 Other 20 23 23 Total interest expense $ 247 $ 237 $ 219 Income tax (benefit) expense: Regulated electric $ (273 ) $ (212 ) $ (156 ) Regulated natural gas 16 29 22 Other (5 ) (19 ) (5 ) Total income tax (benefit) expense $ (262 ) $ (202 ) $ (139 ) Net income: Regulated electric $ 628 $ 570 $ 512 Regulated natural gas 54 35 32 Other (13 ) (31 ) (12 ) Net income $ 669 $ 574 $ 532 Years Ended December 31, 2018 2017 2016 Capital expenditures: Regulated electric $ 2,223 $ 1,686 $ 1,564 Regulated natural gas 109 87 72 Total capital expenditures $ 2,332 $ 1,773 $ 1,636 As of December 31, 2018 2017 2016 Total assets: Regulated electric $ 17,702 $ 16,105 $ 15,304 Regulated natural gas 1,485 1,482 1,424 Other 15 34 19 Total assets $ 19,202 $ 17,621 $ 16,747
Schedule of Goodwill [Table Text Block]	Goodwill by reportable segment as of December 31, 2018 and 2017 , was as follows (in millions): Regulated electric $ 1,191 Regulated natural gas 79 Total $ 1,270
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following tables provide information on a reportable segment basis (in millions): Years Ended December 31, 2018 2017 2016 Operating revenue: Regulated electric $ 752 $ 713 $ 702 Regulated gas 103 99 110 Total operating revenue $ 855 $ 812 $ 812 Operating income: Regulated electric $ 136 $ 175 $ 162 Regulated gas 16 22 19 Total operating income 152 197 181 Interest expense (44 ) (43 ) (54 ) Allowance for borrowed funds 1 2 4 Allowance for equity funds 4 3 (1 ) Other, net 9 5 3 Income before income tax expense $ 122 $ 164 $ 133 As of December 31, 2018 2017 2016 Assets Regulated electric $ 3,177 $ 3,103 $ 3,119 Regulated gas 314 300 314 Regulated common assets (1) 78 10 60 Total assets $ 3,569 $ 3,413 $ 3,493 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Unaudited Quarterly Operating_2

Unaudited Quarterly Operating Results Unaudited Quarterly Operating Results (Tables)	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member]
Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]	Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenue $ 746 $ 717 $ 832 $ 754 Operating income 79 87 278 107 Net income (loss) 106 106 483 (13 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenue $ 695 $ 658 $ 813 $ 671 Operating income 102 130 284 27 Net income 105 134 385 (19 ) Quarterly operating results are affected by, among other things, MidAmerican Energy's seasonal retail electricity prices, the timing of recognition of federal renewable electricity production tax credits related to MidAmerican Energy's wind-powered generating facilities and the seasonal impact of weather on electricity and natural gas sales.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]	Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenue $ 747 $ 718 $ 832 $ 756 Operating income 79 87 278 106 Net income (loss) 103 103 479 (16 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenue $ 696 $ 659 $ 815 $ 676 Operating income 102 131 284 27 Net income 102 131 383 (42 ) Quarterly operating results are affected by, among other things, MidAmerican Energy's seasonal retail electricity prices, the timing of recognition of federal renewable electricity production tax credits related to MidAmerican Energy's wind-powered generating facilities and the seasonal impact of weather on electricity and natural gas sales.
Nevada Power Company [Member]
Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]	Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Operating revenues $ 395 $ 562 $ 820 $ 407 Operating income 40 122 247 37 Net income — 64 164 (2 ) Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Operating revenues $ 392 $ 574 $ 819 $ 421 Operating income 52 157 317 37 Net income 10 77 176 (8 )
Sierra Pacific Power Company [Member]
Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]	Three-Month Periods Ended March 31, June 30, September 30, December 31, 2018 2018 2018 2018 Regulated electric operating revenue $ 181 $ 169 $ 225 $ 177 Regulated natural gas operating revenue 41 19 14 29 Operating income 47 19 56 30 Net income 34 7 35 16 Three-Month Periods Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Regulated electric operating revenue $ 159 $ 160 $ 215 $ 179 Regulated natural gas operating revenue 34 17 15 33 Operating income 46 36 75 41 Net income 24 17 44 24

Discontinued Operations Disco_2

Discontinued Operations Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2018
MidAmerican Energy Company [Member] | Unregulated Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations [Table Text Block]	deleted

Revenue from Contract with Cu_2

Revenue from Contract with Customer Revenue from Contract with Customer (Tables)	12 Months Ended
	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table summarizes the Company's energy products and services revenue by regulated energy and nonregulated energy, with further disaggregation of regulated energy by customer class and line of business, including a reconciliation to the Company's reportable segment information included in Note 21 (in millions): For the Year Ended December 31, 2018 PacifiCorp MidAmerican Funding NV Energy Northern Powergrid BHE Pipeline Group BHE Transmission BHE Renewables BHE and Other (1) Total Customer Revenue: Regulated: Retail Electric $ 4,732 $ 1,915 $ 2,773 $ — $ — $ — $ — $ (1 ) $ 9,419 Retail Gas — 636 101 — — — — — 737 Wholesale 55 411 39 — — — — (4 ) 501 Transmission and 103 56 96 892 — 700 — (1 ) 1,846 Interstate pipeline — — — — 1,232 — — (125 ) 1,107 Other — — 2 — — — — — 2 Total Regulated 4,890 3,018 3,011 892 1,232 700 — (131 ) 13,612 Nonregulated — 14 — 39 — 10 673 624 1,360 Total Customer Revenue 4,890 3,032 3,011 931 1,232 710 673 493 14,972 Other revenue (2) 136 21 28 89 (29 ) — 235 121 601 Total $ 5,026 $ 3,053 $ 3,039 $ 1,020 $ 1,203 $ 710 $ 908 $ 614 $ 15,573 (1) The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations. (2) Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table summarizes the Company's revenue it expects to recognize in future periods related to significant unsatisfied remaining performance obligations for fixed contracts with expected durations in excess of one year as of December 31, 2018, by reportable segment (in millions): Performance obligations expected to be satisfied: Less than 12 months More than 12 months Total BHE Pipeline Group $ 842 $ 5,678 $ 6,520
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table summarizes the Company's real estate services revenue by line of business (in millions): HomeServices Year Ended Ended December 31, 2018 Customer Revenue: Brokerage $ 3,882 Franchise 67 Total Customer Revenue 3,949 Other revenue 265 Total $ 4,214
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table summarizes PacifiCorp's revenue by regulated energy, with further disaggregation of regulated energy by customer class, for the year ended December 31 (in millions): 2018 Customer Revenue: Retail: Residential $ 1,737 Commercial 1,513 Industrial 1,172 Other retail 234 Total retail 4,656 Wholesale 55 Transmission 103 Other Customer Revenue 76 Total Customer Revenue 4,890 Other revenue 136 Total operating revenue $ 5,026
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table summarizes Nevada Power's revenue by customer class for the year ended December 31 (in millions): 2018 Customer Revenue: Retail: Residential $ 1,195 Commercial 433 Industrial 425 Other 24 Total fully bundled 2,077 Distribution only service 30 Total retail 2,107 Wholesale, transmission and other 53 Total Customer Revenue 2,160 Other revenue 24 Total revenue $ 2,184
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table summarizes Sierra Pacific's revenue by customer class, including a reconciliation to Sierra Pacific's reportable segment information included in Note 16 , for the year ended December 31 (in millions): 2018 Electric Gas Total Customer Revenue: Retail: Residential $ 267 $ 67 $ 334 Commercial 246 25 271 Industrial 177 8 185 Other 6 1 7 Total fully bundled 696 101 797 Distribution only service 4 — 4 Total retail 700 101 801 Wholesale, transmission and other 48 — 48 Total Customer Revenue 748 101 849 Other revenue 4 2 6 Total revenue $ 752 $ 103 $ 855

Organization and Operations (De

Organization and Operations (Details)	12 Months Ended
	Dec. 31, 2018OperatingSegmentsOwnedAndOperatedCompanies
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments | OperatingSegments	8
Number of owned and operated utility companies in the United States	4
Number of states owned and operated utility companies serve customers	11
Number of owned and operated electricity distribution companies in Great Britain	2
Number of owned and operated interstate natural gas pipeline companies in the United States	2
Number of owned and operated electricity transmission companies in Canada	1
Number of owned and operated renewable energy businesses	1
Number of owned and operated residential real estate brokerage firms in the United States	1
Number of owned and operated real estate franchise networks in the United States	1

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts [Line Items]
Allowance for doubtful accounts	$ 42	$ 40

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies - Inventory [Abstract]
Energy Related Inventory, Other Fossil Fuel	$ 273	$ 352
Inventory, Raw Materials and Supplies, Gross	571	536
Replacement cost of inventory	$ 14	$ 22

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies - Revenue Recognition [Abstract]
Unbilled revenue	$ 554	$ 665

Summary of Significant Accoun_7

Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - BHE - USD ($) $ in Millions	Jan. 02, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Federal statutory income tax rate		21.00%	35.00%	35.00%
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1,085
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ (8)	$ 4
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			27	26
Tax Cuts and Jobs Act of 2017 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Federal statutory income tax rate		21.00%
Reclassification from operating activities [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			15	22
Reclassification out of investing activities [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ 81	$ 36
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 550
Scenario, Forecast [Member] | Finance Lease [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 525

Summary of SIgnificant Accoun_8

Summary of SIgnificant Accounting Policies - PacifiCorp - Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
PacifiCorp [Member]
Unrealized gains and losses on available-for-sale securities	$ 0	$ 0

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - PacifiCorp - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 40
Ending balance	42	$ 40
PacifiCorp [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	10	7
Ending balance	8	10	$ 7
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | PacifiCorp [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	10	7	7
Charged to operating costs and expenses, net	12	15	12
Write-offs, net	$ 14	12	12
Ending balance		$ 10	$ 7

Summary of Significant Accou_10

Summary of Significant Accounting Policies - PacifiCorp - Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
PacifiCorp [Member]
Unbilled Contracts Receivable	$ 229	$ 255

Summary of Significant Accou_11

Summary of Significant Accounting Policies - PacifiCorp - Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Total regulatory assets		$ 3,067	$ 2,950
Regulatory Liabilities		7,506	7,511
Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Total regulatory assets	[1]	196	143
Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[2]	$ 3,923	$ 4,143
PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Total regulatory assets		$ 1,112	$ 1,061
Regulatory Liabilities		3,055	3,071
Deferred investment tax credit		13	16
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[3]	$ 1,803	$ 1,960
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[4]	$ 5,950
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[4]	$ 8
[1]	Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[3]	(2)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 8 for further discussion of 2017 Tax Reform.
[4]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Summary of Significant Accou_12

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Pacificorp - New Accounting Pronouncements (Details) - USD ($) $ in Millions	Jan. 02, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1,085
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ (8)	$ 4
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			27	26
PacifiCorp [Member] | Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			27	25
Other Pension, Postretirement and Supplemental Plans [Member] | PacifiCorp [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ 22	$ 2
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 550
Scenario, Forecast [Member] | Operating Lease [Member] | PacifiCorp [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 15

Summary of Significant Accou_13

Summary of Significant Accounting Policies - MEC - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 42	$ 40
MidAmerican Energy Company [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 7	$ 7

Summary of Significant Accou_14

Summary of Significant Accounting Policies - MEC - Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 571	$ 536
Replacement cost of inventory	14	22
MidAmerican Energy Company [Member]
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	124	100
Public utility inventory, coal	51	117
Public utility inventory - natural gas in storage	24	24
Replacement cost of inventory	$ 14	$ 22

Summary of Significant Accou_15

Summary of Significant Accounting Policies - MEC - Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Unbilled revenue	$ 554	$ 665
MidAmerican Energy Company [Member]
Unbilled revenue	88	89
Adjustment clause accounts receivable (payable)	$ 56	$ 72

Summary of Significant Accou_16

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - MEC - Income Taxes (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities, noncurrent		$ 7,346	$ 7,309
Regulatory assets		2,896	2,761
MidAmerican Energy Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities, noncurrent		1,620	1,661
Regulatory assets		273	204
Deferred Income Tax Charge [Member] | MidAmerican Energy Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities, noncurrent	[1]	$ 626	$ 681
[1]	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations.(4)

Summary of Significant Accou_17

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - MEC - New Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 40		$ 42
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment	(8)	$ 4
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Doubtful Accounts Receivable, Current	7		7
Energy Related Inventory, Gas Stored Underground	24		$ 24
Other Pension, Postretirement and Supplemental Plans [Member] | MidAmerican Energy Company [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment	20	15
MidAmerican Energy Company [Member] | Other Pension, Postretirement and Supplemental Plans [Member] | MidAmerican Energy Company [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment	$ 18	$ 15

Summary of Significant Accou_18

Summary of Significant Accounting Policies - MidAmerican Funding - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
MidAmerican Funding, LLC and Subsidiaries [Domain]
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0

Summary of Significant Accou_19

Summary of Significant Accounting Policies - NPC - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts [Line Items]
Beginning balance	$ 40
Ending balance	42	$ 40
Nevada Power Company [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Allowance for Doubtful Accounts [Line Items]
Beginning balance	16	12	$ 13
Charged to operating costs and expenses, net	15	15	16
Write-offs, net	15	11	17
Ending balance	$ 16	$ 16	$ 12

Summary of Significant Accou_20

Summary of Significant Accounting Policies - NPC - Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 571	$ 536
Energy Related Inventory, Other Fossil Fuel	273	352
Nevada Power Company [Member]
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	56	56
Energy Related Inventory, Other Fossil Fuel	$ 5	$ 3

Summary of Significant Accou_21

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - NPC - Property, Plant and Equipment, Net (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Rate	7.95%	8.09%

Summary of Significant Accou_22

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - NPC - Income Taxes (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Nevada Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Nevada Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%

Summary of Significant Accou_23

Summary of Significant Accounting Policies - NPC - Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Nevada Power Company [Member]
Unbilled Contracts Receivable	$ 106	$ 111

Summary of Significant Accou_24

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - NPC - New Accounting Pronouncements (Details) (Details) - USD ($) $ in Millions	Jan. 02, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1,085
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ (8)	$ 4
Accounting Standards Update 2017-07 [Member] | Nevada Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ 2	$ 3
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 550
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member] | Nevada Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 15

Summary of Significant Accou_25

Summary of Significant Accounting Policies - SPPC - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts [Line Items]
Beginning balance	$ 40
Ending balance	42	$ 40
Sierra Pacific Power Company [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Allowance for Doubtful Accounts [Line Items]
Beginning balance	2	2	$ 1
Charged to operating costs and expenses, net	1	2	2
Write-offs, net	1	2	1
Ending balance	$ 2	$ 2	$ 2

Summary of Significant Accou_26

Summary of Significant Accounting Policies - SPPC - Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 571	$ 536
Energy Related Inventory, Other Fossil Fuel	273	352
Sierra Pacific Power Company [Member]
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	44	42
Energy Related Inventory, Other Fossil Fuel	$ 8	$ 7

Summary of Significant Accou_27

Summary of Significant Accounting Policies - SPPC - Property, Plant and Equipment, Net (Details) - Sierra Pacific Power Company [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Rate	6.65%	6.65%
Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Rate	5.74%	5.63%
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Rate	6.55%	6.55%

Summary of Significant Accou_28

Summary of Significant Accounting Policies - SPPC - Income Taxes (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Sierra Pacific Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Sierra Pacific Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%

Summary of Significant Accou_29

Summary of Significant Accounting Policies - SPPC - Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Unbilled revenue	$ 554	$ 665
Sierra Pacific Power Company [Member]
Unbilled revenue	$ 57	$ 62

Summary of Significant Accou_30

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - SPPC - New Accounting Pronouncements (Details) (Details) - USD ($) $ in Millions	Jan. 02, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1,085
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ (8)	$ 4
Accounting Standards Update 2017-07 [Member] | Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment			$ 1	$ (1)
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 550
Scenario, Forecast [Member] | Operating Lease [Member] | Accounting Standards Update 2016-02 [Member] | Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 20

Business Acquisitions (Details)

Business Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Acquisition, net of cash acquired		$ (106)	$ (1,113)	$ (66)
Goodwill		9,595	9,678	9,010
Business acquisition, acquisition of remaining noncontrolling interest		131	0	0
Other acquisitions [Member]
Business Acquisition [Line Items]
Acquisition, net of cash acquired		(100)	(1,100)	(66)
Total assets assumed		0	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		12	487	54
Goodwill		$ 79	$ 508	$ 50
HomeServices [Member] | Real estate brokerage franchise business [Member]
Business Acquisition [Line Items]
Ownership Percentage Acquired	33.30%
Business acquisition, acquisition of remaining noncontrolling interest	$ 131

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 68,595	$ 65,871	$ 62,509
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	84,812	81,836
Accumulated depreciation and amortization	(26,010)	(24,478)
Property, plant and equipment in service, net	58,802	57,358
Construction work-in-progress	2,900	2,200
Regulated Operation [Member] | Utility generation, distribution and transmission system [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 77,288	74,660
Regulated Operation [Member] | Utility generation, distribution and transmission system [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] | Utility generation, distribution and transmission system [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	80 years
Regulated Operation [Member] | Interstate natural gas pipeline assets [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,524	7,176
Regulated Operation [Member] | Interstate natural gas pipeline assets [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Regulated Operation [Member] | Interstate natural gas pipeline assets [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	80 years
Nonregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,324	7,499
Accumulated depreciation and amortization	(1,641)	(1,542)
Property, plant and equipment in service, net	6,683	5,957
Nonregulated Operation [Member] | Independent power plants [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,826	6,010
Nonregulated Operation [Member] | Other assets [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,498	1,489
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	65,485	63,315
Construction work-in-progress	3,110	2,556
Property, plant and equipment, net	$ 68,595	65,871
Nonregulated Operation [Member] | Independent power plants [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Nonregulated Operation [Member] | Independent power plants [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Nonregulated Operation [Member] | Other assets [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Nonregulated Operation [Member] | Other assets [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 19,591	19,203	19,162
MidAmerican Funding [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 16,171	$ 14,221	$ 12,835

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 28,446	$ 27,880
Public utility accumulated depreciation and amortization		(10,060)	(9,366)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress		18,396	18,525
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		1,195	678
Public Utilities, Property, Plant and Equipment, Net		$ 19,591	$ 19,203
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service		3.50%	2.90%	2.90%
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments		$ 156
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation		$ 127	$ 122
Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life		14 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life		58 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life		20 years
Finite-Lived Intangible Asset, Useful Life	[1]	5 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life		5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life		67 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life		75 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life		70 years
Finite-Lived Intangible Asset, Useful Life	[1]	75 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life		60 years
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 12,606	12,490
Electric Transmission [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		6,357	6,226
Electric Distribution [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		7,030	6,792
Other Intangible Assets [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	[1]	970	937
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 1,483	1,435
Computer Software, Intangible Asset [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life		5 years
Computer Software, Intangible Asset [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress		$ 18,386	18,514
Nonregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress		$ 10	$ 11
[1]	Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.

Property, Plant and Equipment_5

Property, Plant and Equipment, Net Property, Plant and Equipment - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 15,124	$ 13,410
Public Utilities, Property, Plant and Equipment, Net	$ 16,159	$ 14,207
Regulated Electric [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.90%	2.60%	2.80%
Natural Gas Processing Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.80%	2.70%	2.90%
Regulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	$ 21,059	$ 18,965
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,941)	(5,561)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	15,118	13,404
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,035	797
Regulated Operation [Member] | Electric Operations [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	13,727	12,107
Public Utilities, Property, Plant and Equipment, Transmission	1,934	1,838
Public Utilities, Property, Plant and Equipment, Distribution	3,672	3,380
Regulated Operation [Member] | Natural Gas Processing Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	1,726	1,640
Nonregulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(1)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	6
Gross public utility property, plant and equipment in service	$ 7	$ 7
Minimum [Member] | Regulated Operation [Member] | Electric Operations [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	52 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Minimum [Member] | Regulated Operation [Member] | Natural Gas Processing Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	29 years
Minimum [Member] | Nonregulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	20 years
Maximum [Member] | Regulated Operation [Member] | Electric Operations [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	75 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	75 years
Maximum [Member] | Regulated Operation [Member] | Natural Gas Processing Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	75 years
Maximum [Member] | Nonregulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	50 years
Electricity Generation Plant, Non-Nuclear [Member] | Regulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	$ 3
Change in Accounting Estimates, Impact on Future Periods	$ 34

Property, Plant and Equipment_6

Property, Plant and Equipment, Net Property, Plant and Equipment - LLC (Details) - Other Capitalized Property Plant and Equipment [Member] - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24	$ 24
Accumulated depreciation and amortization	$ 12	$ 10

Property, Plant and Equipment_7

Property, Plant and Equipment, Net - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 30, 2017
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,771	$ 6,804
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	97	73
Public Utilities, Property, Plant and Equipment, Net	$ 6,868	$ 6,877
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	3.20%	3.20%	3.20%
Nevada Power Company [Member] | Silverhawk Generating Station [Member]
Property, Plant and Equipment [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%
Nevada Power Company [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	$ 7
Nevada Power Company [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,720	$ 3,707
Public Utilities, Property, Plant and Equipment, Distribution	3,411	3,314
Public Utilities, Property, Plant and Equipment, Transmission	1,867	1,860
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	848	793
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,846	9,674
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,076	2,871
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6,770	6,803
Nevada Power Company [Member] | Nonregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 1	$ 1
Nevada Power Company [Member] | Minimum [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	45 years	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Nevada Power Company [Member] | Minimum [Member] | Nonregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years
Nevada Power Company [Member] | Maximum [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	55 years	55 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	65 years	65 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years
Nevada Power Company [Member] | Maximum [Member] | Nonregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years
Silverhawk Generating Station [Member] | 130 Megawatts of Natural Gas Energy [Member]
Property, Plant and Equipment [Line Items]
Business Acquisition, Transaction Costs				$ 77

Property, Plant and Equipment_8

Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,894	$ 2,760
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	90	132
Public Utilities, Property, Plant and Equipment, Net	$ 2,984	$ 2,892
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	3.10%	3.00%	3.00%
Electricity Generation Plant, Non-Nuclear [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	$ 1,144	$ 1,144
Public Utilities, Property, Plant and Equipment, Distribution	1,568	1,459
Public Utilities, Property, Plant and Equipment, Transmission	835	786
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 197	$ 181
Electricity Generation Plant, Non-Nuclear [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	25 years	25 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Electricity Generation Plant, Non-Nuclear [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Natural Gas Processing Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 403	$ 390
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 14	$ 14
Natural Gas Processing Plant [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	35 years	35 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Natural Gas Processing Plant [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Common Facilities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	$ 321	$ 294
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,482	4,268
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1,593)	(1,513)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,889	$ 2,755
Common Facilities [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years	5 years
Common Facilities [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	70 years	70 years
Nonregulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 5	$ 5
Nonregulated Operation [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Nonregulated Operation [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Electricity Generation Plant, Non-Nuclear [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods	$ 9
Change in Accounting Estimate, Amount Deferred to Future Periods	$ 7

Jointly Owned Utility Facilit_3

Jointly Owned Utility Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,874
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	4,608
Construction Work in Progress	134
PacifiCorp [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	4,471
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1,976
Construction Work in Progress	$ 100
PacifiCorp [Member] | Jim Bridger Unit Nos 1 thru 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	67.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 1,458
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	647
Construction Work in Progress	$ 11
PacifiCorp [Member] | Hunter Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	94.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 484
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	182
Construction Work in Progress	$ 0
PacifiCorp [Member] | Hunter No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	60.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 298
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	121
Construction Work in Progress	$ 5
PacifiCorp [Member] | Wyodak [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	80.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 471
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	229
Construction Work in Progress	$ 0
PacifiCorp [Member] | Colstrip Unit Nos 3 and 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	10.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 248
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	137
Construction Work in Progress	$ 6
PacifiCorp [Member] | Hermiston [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 180
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	87
Construction Work in Progress	$ 1
PacifiCorp [Member] | Craig Units Nos 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	19.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 367
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	241
Construction Work in Progress	$ 0
PacifiCorp [Member] | Hayden Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 74
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	37
Construction Work in Progress	$ 0
PacifiCorp [Member] | Hayden No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	13.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 43
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	22
Construction Work in Progress	$ 0
PacifiCorp [Member] | Foote Creek [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	79.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 40
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	27
Construction Work in Progress	$ 1
PacifiCorp [Member] | Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 808
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	246
Construction Work in Progress	76
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	4,279
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1,982
Construction Work in Progress	$ 32
MidAmerican Energy Company [Member] | Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 257
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	92
Construction Work in Progress	$ 0
MidAmerican Energy Company [Member] | Louisa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	88.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 822
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	443
Construction Work in Progress	$ 8
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%	[1]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 723	[1]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	407	[1]
Construction Work in Progress	$ 10	[1]
MidAmerican Energy Company [Member] | Walter Scott, Jr. No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	79.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 641
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	304
Construction Work in Progress	$ 2
MidAmerican Energy Company [Member] | Walter Scott Jr Unit No 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	60.00%	[2]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 454	[2]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	167	[2]
Construction Work in Progress	$ 1	[2]
MidAmerican Energy Company [Member] | George Neal No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	41.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 310
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	164
Construction Work in Progress	$ 2
MidAmerican Energy Company [Member] | Ottumwa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	52.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 630
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	209
Construction Work in Progress	$ 6
MidAmerican Energy Company [Member] | George Neal Unit No 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	72.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 442
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	196
Construction Work in Progress	3
NV Energy [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	838
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	477
Construction Work in Progress	$ 2
NV Energy [Member] | Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 226
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	49
Construction Work in Progress	$ 1
NV Energy [Member] | Navajo Generating Station [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	11.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 223
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	176
Construction Work in Progress	$ 0
NV Energy [Member] | Valmy [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 389
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	252
Construction Work in Progress	$ 1
BHE Pipeline Group [Member] | BHE Pipeline Group - common facilities [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 286
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	173
Construction Work in Progress	$ 0
[1]	Includes amounts related to nuclear fuel.
[2]	Facility in-service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million, respectively.

Jointly Owned Utility Facilit_4

Jointly Owned Utility Facilities - PacifiCorp (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,874
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	4,608
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	134
PacifiCorp [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	4,471
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1,976
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 100
PacifiCorp [Member] | Jim Bridger Unit Nos 1 thru 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	67.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 1,458
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	647
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 11
PacifiCorp [Member] | Hunter Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	94.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 484
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	182
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
PacifiCorp [Member] | Hunter No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	60.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 298
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	121
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 5
PacifiCorp [Member] | Wyodak [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	80.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 471
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	229
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
PacifiCorp [Member] | Colstrip Unit Nos 3 and 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	10.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 248
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	137
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 6
PacifiCorp [Member] | Hermiston [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 180
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	87
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
PacifiCorp [Member] | Craig Units Nos 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	19.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 367
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	241
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
PacifiCorp [Member] | Hayden Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 74
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	37
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
PacifiCorp [Member] | Hayden No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	13.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 43
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	22
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
PacifiCorp [Member] | Foote Creek [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	79.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 40
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	27
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
PacifiCorp [Member] | Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 808
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	246
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 76

Jointly Owned Utility Facilit_5

Jointly Owned Utility Facilities Jointly Owned Utility Facilities - MEC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,874
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	4,608
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	134
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	4,279
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1,982
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 32
MidAmerican Energy Company [Member] | Louisa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	88.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 822
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	443
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 8
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%	[1]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 723	[1]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	407	[1]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 10	[1]
MidAmerican Energy Company [Member] | Walter Scott, Jr. No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	79.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 641
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	304
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 2
MidAmerican Energy Company [Member] | Walter Scott Jr Unit No 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	60.00%	[2]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 454	[2]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	167	[2]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	1	[2]
Revenue sharing credits netted against facility in service	319
Revenue sharing credits netted against accumulated depreciation	$ 88
MidAmerican Energy Company [Member] | George Neal No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	41.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 310
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	164
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 2
MidAmerican Energy Company [Member] | Ottumwa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	52.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 630
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	209
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 6
MidAmerican Energy Company [Member] | George Neal Unit No 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	72.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 442
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	196
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 3
MidAmerican Energy Company [Member] | Transmission facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 257
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	92
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
[1]	(1)Includes amounts related to nuclear fuel.
[2]	(2)Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $88 million, respectively.

Jointly Owned Utility Facilit_6

Jointly Owned Utility Facilities - NPC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,874
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	4,608
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	134
Nevada Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	437
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	222
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
Nevada Power Company [Member] | Navajo Generating Station [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	11.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 223
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	176
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
Nevada Power Company [Member] | ON Line Transmission Line [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	24.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 147
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	19
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
Nevada Power Company [Member] | Other Transmission Facilities [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 67
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	27
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0

Jointly Owned Utility Facilit_7

Jointly Owned Utility Facilities - SPPC (Details) $ in Millions	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,874
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	4,608
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	134
Sierra Pacific Power Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	401
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	255
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
Sierra Pacific Power Company [Member] | Valmy [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 389
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	252
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
Sierra Pacific Power Company [Member] | ON Line Transmission Line [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	1.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 8
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
Sierra Pacific Power Company [Member] | Valmy Transmission Line [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 4
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	2
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0

Regulatory Matters - Regulatory

Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory assets		$ 171	$ 189
Regulatory assets, noncurrent		2,896	2,761
Total regulatory assets		3,067	2,950
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		1,300	1,100
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[1]	$ 196	143
Regulatory asset amortization period years	[1]	Various
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[2]	$ 773	675
Regulatory asset amortization period years	[2]	15.5135834411384
Asset disposition costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 358	387
Regulatory asset amortization period years		Various
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 103	58
Regulatory asset amortization period years		2.20388349514563
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 375	334
Regulatory asset amortization period years		16.8053333333333
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 120	122
Regulatory asset amortization period years		1.8
Abandoned Projects [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 134	156
Regulatory asset amortization period years		2.11940298507463
Deferred Operating Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 141	147
Regulatory asset amortization period years		10
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 79	89
Regulatory asset amortization period years		5
Regulatory assets other [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 788	$ 839
Regulatory asset amortization period years		Various
[1]	Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.
[2]	(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Regulatory Matters - Regulato_2

Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions		1 Months Ended			12 Months Ended
		Jul. 31, 2016	Oct. 31, 2015	Nov. 30, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Federal statutory income tax rate					21.00%	35.00%	35.00%
Regulatory liabilities					$ 160	$ 202
Regulatory liabilities, noncurrent					7,346	7,309
Regulatory Liabilities					7,506	7,511
Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[1]				$ 3,923	4,143
Weighted average remaining life	[1]				Various
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[2]				$ 2,426	2,349
Weighted average remaining life	[2]				27.5028854080791
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities					$ 163	177
Weighted average remaining life					33.6871165644172
Levelized depreciation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities					$ 329	332
Weighted average remaining life					30
Impact fees [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities					$ 88	$ 89
Weighted average remaining life					4
Amount for discontinuance of CWIP in rate base [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 82
Amount for change to flow through method for income taxes [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 45
AltaLink [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 415
Public Utilities, Approved Rate Increase (Decrease), Amount							200
AltaLink [Member] | 2015-2016 GTA [Member] | GTA 2015 [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		599
AltaLink [Member] | 2015-2016 GTA [Member] | GTA 2016 [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		685
AltaLink [Member] | Amount previously collected as CWIP given as refund [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		277					$ 200
AltaLink [Member] | Amount previously collected as CWIP given as returns [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		12
AltaLink [Member] | Amount for change to flow through method for income taxes [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 68
2015-2016 GTA [Member] | AltaLink [Member] | GTA 2015 [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			672	$ 811
2015-2016 GTA [Member] | AltaLink [Member] | GTA 2016 [Member] | Alberta Utilities Commission [Member]
Regulatory Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 704	$ 1,000
Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate					21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[3]				$ 5,950
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[3]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Regulatory Matters - PacifiCorp

Regulatory Matters - PacifiCorp - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory assets		$ 171	$ 189
Regulatory assets, noncurrent		2,896	2,761
Total regulatory assets		3,067	2,950
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		1,300	1,100
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[1]	$ 196	143
Regulatory asset amortization period years	[1]	Various
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[2]	$ 773	675
Regulatory asset amortization period years	[2]	15.5135834411384
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 79	89
Regulatory asset amortization period years		5
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 103	58
Regulatory asset amortization period years		2.20388349514563
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 120	122
Regulatory asset amortization period years		1.8
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 375	334
Regulatory asset amortization period years		16.8053333333333
PacifiCorp [Member]
Regulatory Assets [Line Items]
Regulatory assets		$ 36	31
Regulatory assets, noncurrent		1,076	1,030
Total regulatory assets		1,112	1,061
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		636	589
PacifiCorp [Member] | Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[3]	$ 448	418
Regulatory asset amortization period years	[3]	20 years
PacifiCorp [Member] | Utah mine disposition [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[4]	$ 136	156
Regulatory asset amortization period years	[4]	Various
PacifiCorp [Member] | Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 79	89
Regulatory asset amortization period years		5 years
PacifiCorp [Member] | Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 62	21
Regulatory asset amortization period years		3 year
PacifiCorp [Member] | Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 96	101
Regulatory asset amortization period years		2 years
PacifiCorp [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 119	100
Regulatory asset amortization period years		31 years
PacifiCorp [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 172	$ 176
Regulatory asset amortization period years		Various
[1]	Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.
[2]	(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.
[3]	(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.
[4]	(2)Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery.

Regulatory Matters - PacifiCo_2

Regulatory Matters - PacifiCorp - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Regulatory liabilities		$ 160	$ 202
Regulatory liabilities, noncurrent		7,346	7,309
Regulatory Liabilities		7,506	7,511
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[1]	$ 2,426	2,349
Regulatory liability amortization period years	[1]	27.5028854080791
Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[2]	$ 3,923	$ 4,143
Regulatory liability amortization period years	[2]	Various
PacifiCorp [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Regulatory liabilities		$ 77	$ 75
Regulatory liabilities, noncurrent		2,978	2,996
Regulatory Liabilities		3,055	3,071
PacifiCorp [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities, noncurrent		994	955
Regulatory Liabilities	[3]	$ 994	955
Regulatory liability amortization period years	[3]	26 years
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[4]	$ 1,803	1,960
Regulatory liability amortization period years	[4]	Various
PacifiCorp [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 258	$ 156
Regulatory liability amortization period years		Various
Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[5]	$ 5,950
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[5]	$ 8
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[3]	(1)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[4]	(2)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 8 for further discussion of 2017 Tax Reform.
[5]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Regulatory Matters - MEC - Regu

Regulatory Matters - MEC - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory assets		$ 2,896	$ 2,761
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 1,300	1,100
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years	[1]	Various
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		16.8053333333333
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years	[2]	15.5135834411384
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		1.8
MidAmerican Energy Company [Member]
Regulatory Assets [Line Items]
Regulatory assets		$ 273	204
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 300	200
MidAmerican Energy Company [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period	[3]	12 years
Regulatory assets	[3]	$ 160	133
MidAmerican Energy Company [Member] | Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period	[4]	14 years
Regulatory assets	[4]	$ 62	38
MidAmerican Energy Company [Member] | Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period		1 year
Regulatory assets		$ 19	6
MidAmerican Energy Company [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		Various
Regulatory assets		$ 32	$ 27
[1]	Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.
[2]	(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.
[3]	(1)Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 11 for a discussion of asset retirement obligations.
[4]	(2)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.Mi

Regulatory Matters - MEC - Re_2

Regulatory Matters - MEC - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%	35.00%
Regulatory liabilities		$ 7,346	$ 7,309
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[1]	27.5028854080791
Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[2]	Various
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		33.6871165644172
Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
MidAmerican Energy Company [Member]
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%	35.00%
Regulatory liabilities		$ 1,620	$ 1,661
MidAmerican Energy Company [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[3]	29 years
Regulatory liabilities	[3]	$ 708	688
MidAmerican Energy Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[4]	29 years
Regulatory liabilities	[4]	$ 626	681
MidAmerican Energy Company [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[4]	34 years
Regulatory liabilities	[4]	$ 160	173
MidAmerican Energy Company [Member] | Transmission MVP CWIP Return [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[5]	54 years
Regulatory liabilities	[5]	$ 36	35
MidAmerican Energy Company [Member] | Regulatory revenue sharing arrangement [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[6]	1 year
Regulatory liabilities	[6]	$ 70	26
MidAmerican Energy Company [Member] | Pension and other postretirement costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		N/A
Regulatory liabilities	[7]	$ 0	41
MidAmerican Energy Company [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		Various
Regulatory liabilities		$ 20	$ 17
MidAmerican Energy Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[3]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.(2)
[4]	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations.(4)
[5]	Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.(5)
[6]	Represents AFUDC accrued on transmission MVPs that is deducted from rate base as a result of the inclusion of related construction work-in-progress in rate base.(6)
[7]	Represents current-year accruals under a regulatory arrangement in Iowa in which equity returns exceeding specified thresholds reduce utility plant upon final determination.

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters - NPC - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Total regulatory assets		$ 3,067	$ 2,950
Regulatory assets		171	189
Regulatory assets		2,896	2,761
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 1,300	1,100
Deferred Operating Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		10
Total regulatory assets		$ 141	147
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		16.8053333333333
Total regulatory assets		$ 375	334
Abandoned Projects [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		2.11940298507463
Total regulatory assets		$ 134	156
Nevada Power Company [Member]
Regulatory Assets [Line Items]
Total regulatory assets		917	969
Regulatory assets		39	28
Regulatory assets		878	941
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		334	363
Nevada Power Company [Member] | Decommissioning costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Amortization Period Unknown		$ 81
Regulatory asset amortization period years	[1]	P5Y
Total regulatory assets	[1]	$ 222	231
Nevada Power Company [Member] | Deferred Operating Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P10Y
Total regulatory assets		$ 152	169
Nevada Power Company [Member] | Acquisition-related Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P26Y
Total regulatory assets		$ 125	130
Nevada Power Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years	[2]	P8Y
Total regulatory assets	[2]	$ 105	89
Nevada Power Company [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P7Y
Total regulatory assets		$ 68	72
Nevada Power Company [Member] | Abandoned Projects [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P2Y
Total regulatory assets		$ 46	58
Nevada Power Company [Member] | Legacy Meters [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P14Y
Total regulatory assets		$ 53	56
Nevada Power Company [Member] | ON Line Transmission Line [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P35Y
Total regulatory assets		$ 46	47
Nevada Power Company [Member] | Deferred Excess Energy Costs [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		P1Y
Total regulatory assets		$ 47	46
Nevada Power Company [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		Various
Total regulatory assets		$ 53	$ 71
[1]	(2)Amount includes regulatory assets with an indeterminate life of $81 million as of December 31, 2018.
[2]	(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Regulatory Matters - NPC - Regu

Regulatory Matters - NPC - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 7,506	$ 7,511
Regulatory liabilities		160	202
Regulatory liabilities		$ 7,346	$ 7,309
Federal statutory income tax rate		21.00%	35.00%	35.00%
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[1]	27.5028854080791
Regulatory Liabilities	[1]	$ 2,426	$ 2,349
Impact fees [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		4
Regulatory Liabilities		$ 88	89
Nevada Power Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		1,186	1,121
Regulatory liabilities		49	91
Regulatory liabilities		$ 1,137	$ 1,030
Federal statutory income tax rate		21.00%	35.00%	35.00%
Nevada Power Company [Member] | Deferred Income Taxes [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[2]	P27Y
Regulatory Liabilities	[2]	$ 677	$ 670
Regulatory Liabilities, Amortization Period Unknown	[3]	$ 82
Nevada Power Company [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[3]	P33Y
Regulatory Liabilities	[3]	$ 320	307
Nevada Power Company [Member] | Impact fees [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[4]	P4Y
Regulatory Liabilities	[4]	$ 86	89
Nevada Power Company [Member] | Energy Efficiency Program [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		P1Y
Regulatory Liabilities		$ 24	27
Nevada Power Company [Member] | Regulatory liabilities other [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		Various
Regulatory Liabilities		$ 79	$ 28
Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Nevada Power Company [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.
[3]	(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.
[4]	(3)Amounts reduce rate base or otherwise accrue a carrying cost.

Regulatory Matters - NPC - Othe

Regulatory Matters - NPC - Other (Details)	1 Months Ended		9 Months Ended	12 Months Ended
	Oct. 31, 2018USD ($)	Mar. 31, 2017USD ($)MW	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)number	Dec. 31, 2017USD ($)	Dec. 31, 2016	Mar. 31, 2018USD ($)
Public Utilities, General Disclosures [Line Items]
Federal statutory income tax rate				21.00%	35.00%	35.00%
Regulatory assets				$ 2,896,000,000	$ 2,761,000,000
Tax Cuts and Jobs Act of 2017 [Member]
Public Utilities, General Disclosures [Line Items]
Federal statutory income tax rate				21.00%
Nevada Power Company [Member]
Public Utilities, General Disclosures [Line Items]
Customer Refundable Fees, Refund Payments				$ 1,000,000
Federal statutory income tax rate				21.00%	35.00%	35.00%
Regulatory assets				$ 878,000,000	$ 941,000,000
Nevada Power Company [Member] | 257 Megawatts of Coal Energy [Member]
Public Utilities, General Disclosures [Line Items]
Coal-Fired Power Plant Capacity | MW		257
Regulatory assets							$ 151,000,000
Nevada Power Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Public Utilities, General Disclosures [Line Items]
Federal statutory income tax rate				21.00%
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Wynn Las Vegas LLC [Member]
Public Utilities, General Disclosures [Line Items]
Impact Fee Credit			$ 3,000,000
Increase in Regulatory Liability			5,000,000
Renewable Base Tariff Energy Rate (R-BTER) Obligation	$ 2,000,000
Increase in Regulatory Asset			$ 3,000,000
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Caesars Entertainment Corporation [Member]
Public Utilities, General Disclosures [Line Items]
Impact Fee Payment Term | number				6
Total impact fee		$ 44,000,000
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Stations Casinos LLC [Member]
Public Utilities, General Disclosures [Line Items]
Total impact fee	$ 15,000,000
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | General Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 29,000,000
Public Utilities, Filed Rate Increase (Decrease), Percent				2.00%
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 0
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 26,000,000
Public Utilities, Revenue Sharing, Percent				50.00%
Public Utilities, Return on Equity, Percentage				10.00%
Expense Related to Regulatory Rate Review				$ 44,000,000	28,000,000
Expense Related to Regulatory Rate Review, Earnings Sharing				38,000,000
Expense Related to Regulatory Rate Review, Carrying Charges				6,000,000
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Tax Rate Reduction Rider [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				59,000,000
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Energy Efficiency Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Customer Refund Liability, Current				$ 9,000,000	$ 10,000,000

Regulatory Matters - SPPC - Reg

Regulatory Matters - SPPC - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Total regulatory assets		$ 3,067	$ 2,950
Regulatory assets		171	189
Regulatory assets		2,896	2,761
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 1,300	1,100
Abandoned Projects [Member]
Regulatory Assets [Line Items]
Regulatory asset amortization period years		2.11940298507463
Total regulatory assets		$ 134	156
Sierra Pacific Power Company [Member]
Regulatory Assets [Line Items]
Total regulatory assets		321	332
Regulatory assets		7	32
Regulatory assets		314	300
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 190	188
Sierra Pacific Power Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period	[1]	8 years
Total regulatory assets	[1]	$ 132	110
Sierra Pacific Power Company [Member] | Acquisition-related Costs [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period		28 years
Total regulatory assets		$ 74	77
Sierra Pacific Power Company [Member] | Abandoned Projects [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period		7 years
Total regulatory assets		$ 29	34
Sierra Pacific Power Company [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period		1 year
Total regulatory assets		$ 4	23
Sierra Pacific Power Company [Member] | Loss on Reacquired Debt [Member]
Regulatory Assets [Line Items]
Regulatory Asset, Amortization Period		16 years
Total regulatory assets		$ 19	21
Sierra Pacific Power Company [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 63	$ 67
[1]	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Regulatory Matters - SPPC - R_2

Regulatory Matters - SPPC - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 7,506	$ 7,511
Regulatory liabilities		160	202
Regulatory liabilities		$ 7,346	$ 7,309
Federal statutory income tax rate		21.00%	35.00%	35.00%
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[1]	$ 2,426	$ 2,349
Sierra Pacific Power Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		509	500
Regulatory liabilities		18	19
Regulatory liabilities		$ 491	$ 481
Federal statutory income tax rate		21.00%	35.00%	35.00%
Sierra Pacific Power Company [Member] | Deferred Income Taxes [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[2]	28 years
Regulatory Liabilities	[2]	$ 270	$ 264
Regulatory Liabilities, Amortization Period Unknown	[3]	$ 21	0
Sierra Pacific Power Company [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years	[4]	40 years
Regulatory Liabilities	[4]	$ 210	211
Sierra Pacific Power Company [Member] | Deferred Excess Energy Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liability amortization period years		1 year
Regulatory Liabilities		$ 0	8
Sierra Pacific Power Company [Member] | Regulatory liabilities other [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 29	$ 17
Tax Cuts and Jobs Act of 2017 [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Sierra Pacific Power Company [Member]
Regulatory Liabilities [Line Items]
Federal statutory income tax rate		21.00%
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $21 million and $- million as of December 31, 2018 and 2017, respectively. See Note 9 for further discussion of 2017 Tax Reform impacts.
[3]	(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.
[4]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

Regulatory Matters - SPPC - Oth

Regulatory Matters - SPPC - Other (Details) - Sierra Pacific Power Company [Member] $ in Millions	1 Months Ended		12 Months Ended
	Apr. 30, 2018USD ($)	Mar. 31, 2017USD ($)number	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Public Utilities Commission, Nevada [Member]
Public Utilities, General Disclosures [Line Items]
Impact Fee Payment Term | number		3
Public Utilities Commission, Nevada [Member] | Caesars Entertainment Corporation [Member]
Public Utilities, General Disclosures [Line Items]
Total impact fee	$ 3	$ 4
Public Utilities Commission, Nevada [Member] | Tax Rate Reduction Rider [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 25
Public Utilities Commission, Nevada [Member] | Energy Efficiency Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Customer Refund Liability, Current			2	$ 1
Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Customer Refundable Fees, Refund Payments			$ 1

Investments and Restricted Ca_3

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments [Abstract]
Investments	$ 1,974	$ 2,526
Gain (Loss) on Investments	(538)	14	$ 10
Marketable Securities, Realized Gain (Loss)	2
Marketable Securities, Unrealized Gain (Loss)	(540)
Equity Method Investments [Abstract]
Tax Equity Contributions	698	403	$ 584
Equity method investments	2,440	1,834
Restricted Cash and Investments [Abstract]
Restricted cash and investments	760	863
Investments, including equity method and restricted cash and investments	5,174	5,223
Investments, including equity method and restricted cash and investments, noncurrent	4,903	4,872
Investments, including equity method and restricted cash and investments, current	271	351
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning Fund Investments, Fair Value	504	515
Restricted Cash and Investments, Other [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	256	348
Electric Transmission Texas, LLC [Member]
Equity Method Investments [Abstract]
Equity method investments	$ 527	524
Equity method investment, ownership percentage	50.00%
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	$ 99	137
Equity method investment, ownership percentage	66.67%
Tax Equity Investments
Equity Method Investments [Abstract]
Equity method investments	$ 1,661	1,025
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	153	148
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale Securities, Equity Securities	1,435	1,961
Rabbi trusts [Member]
Investments [Abstract]
Life Insurance, Corporate or Bank Owned, Amount	371	441
Other investments [Member]
Investments [Abstract]
Other Investments	$ 168	$ 124

Investments and Restricted Ca_4

Investments and Restricted Cash and Investments Investments and Restricted Cash and Investments - MEC - (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Investments and restricted cash and cash equivalents and investments	$ 4,903	$ 4,872
Nuclear decommissioning trust funds [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Decommissioning Fund Investments, Fair Value	504	515
MidAmerican Energy Company [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Decommissioning Fund Investments, Fair Value	504
Life Insurance, Corporate or Bank Owned, Amount	191	198
Other Investments	13	15
Investments and restricted cash and cash equivalents and investments	$ 708	$ 728
MidAmerican Energy Company [Member] | Domestic Equity Securities [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Nuclear Decommissioning Trust Fund Ownership Percentage	51.00%	56.00%
MidAmerican Energy Company [Member] | US Government Corporations and Agencies Securities [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Nuclear Decommissioning Trust Fund Ownership Percentage	37.00%	34.00%
MidAmerican Energy Company [Member] | Debt Security, Corporate, US [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Nuclear Decommissioning Trust Fund Ownership Percentage	9.00%	7.00%
MidAmerican Energy Company [Member] | Other Securities [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Nuclear Decommissioning Trust Fund Ownership Percentage	3.00%	3.00%
MidAmerican Energy Company [Member] | Nuclear decommissioning trust funds [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Decommissioning Fund Investments, Fair Value		$ 515

Investments and Restricted Ca_5

Investments and Restricted Cash and Investments - MidAmerican Funding - (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
MidAmerican Funding, LLC and Subsidiaries [Domain]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Life Insurance, Corporate or Bank Owned, Amount	$ 2	$ 2

Short-Term Debt and Credit Fa_3

Short-Term Debt and Credit Facilities Short-Term Debt and Credit Facilities - Credit Facilities (Details) £ in Millions, $ in Millions, $ in Millions		Dec. 31, 2018USD ($)		Dec. 31, 2018GBP (£)	Dec. 31, 2018CAD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114				$ 9,051
Short-term debt	[1]	2,516				4,488
Line of Credit Facility, Amounts Supported	[1]	543				594
Line of Credit Facility, Remaining Borrowing Capacity	[1]	6,055				3,969
BHE Renewables [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		103				118
HomeServices [Member]
Line of Credit Facility [Line Items]
Short-term debt		404				292
Berkshire Hathaway Energy [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		115				96
Line of Credit Facility, Maximum Borrowing Capacity		3,500	[2]			3,600
Short-term debt		983				3,331
Line of Credit Facility, Amounts Supported		0				7
Line of Credit Facility, Remaining Borrowing Capacity		2,517				262
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,200	[2]			1,000
Short-term debt		30				80	$ 270	$ 20	$ 20
Line of Credit Facility, Amounts Supported		89				130
Line of Credit Facility, Remaining Borrowing Capacity		1,081				790
MidAmerican Funding [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,309	[2]			909
Short-term debt		240				0
Line of Credit Facility, Amounts Supported		370				370
Line of Credit Facility, Remaining Borrowing Capacity		699				539
NV Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		650	[2]			650
Short-term debt		0				0
Line of Credit Facility, Amounts Supported		80				80
Line of Credit Facility, Remaining Borrowing Capacity		570				570
Northern Powergrid Holdings [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		231	[2]			203
Short-term debt		77				0
Line of Credit Facility, Amounts Supported		0				0
Line of Credit Facility, Remaining Borrowing Capacity		154				203
AltaLink [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		639	[2]			1,054
Short-term debt		345				345
Line of Credit Facility, Amounts Supported		4				7
Line of Credit Facility, Remaining Borrowing Capacity		290				702
Other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,585	[2]			1,635
Short-term debt		841				732
Line of Credit Facility, Amounts Supported		0				0
Line of Credit Facility, Remaining Borrowing Capacity		744				903
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		250				250
Line of Credit Facility, Amounts Supported		80				80
Line of Credit Facility, Remaining Borrowing Capacity		170				170
Tax exempt bond obligations and commodity contract collateral requirement [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		184				230
Line of Credit Facility, Amounts Supported		170				$ 216
Certain transactions required by third parties [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		$ 14
Line of Credit [Member] | AltaLink Investments, L.P. [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.8		0.8	0.8
EBITDA to interest expense ratio		2.25		2.25	2.25
Debt, Weighted Average Interest Rate		3.25%		3.25%	3.25%	2.40%
Short-term debt		$ 64				$ 224
Line of Credit [Member] | Berkshire Hathaway Energy [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.70		0.70	0.70
Debt, Weighted Average Interest Rate		2.76%		2.76%	2.76%	1.74%
Line of Credit [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65		0.65	0.65
Debt, Weighted Average Interest Rate		2.85%		2.85%	2.85%	1.83%
Line of Credit [Member] | MidAmerican Funding [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65		0.65	0.65
Debt, Weighted Average Interest Rate		2.49%		2.49%	2.49%
Line of Credit [Member] | AltaLink, L.P. [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.75		0.75	0.75
Debt, Weighted Average Interest Rate		2.26%		2.26%	2.26%	1.42%
Short-term debt		$ 281				$ 121
Letter of Credit [Member] | AltaLink Investments, L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 10
Letter of Credit [Member] | Berkshire Hathaway Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported						7
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Line of Credit [Member] | Northern Powergrid (Yorkshire) plc [Member]
Line of Credit Facility [Line Items]
Debt to regulated asset value		0.65		0.65	0.65
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Line of Credit [Member] | Northern Powergrid Holdings [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £				£ 150
Debt to regulated asset value		0.8		0.8	0.8
Interest Coverage Ratio		2.5		2.5	2.5
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Line of Credit [Member] | Northern Powergrid (Northeast) Limited [Member]
Line of Credit Facility [Line Items]
Debt to regulated asset value		0.65		0.65	0.65
Letter of credit and reimbursement facility, Topaz [Member] | Line of Credit [Member] | BHE Renewables [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		$ 127				75
Line of Credit Facility, Maximum Borrowing Capacity		134				134
Letter of credit and reimbursement facility, Solar Star [Member] | Line of Credit [Member] | BHE Renewables [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		92				282
Line of Credit Facility, Maximum Borrowing Capacity		105				$ 301
Unsecured credit facility, $600 million, expiring June 2021, increased and extended [Member] | Line of Credit [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		600
Unsecured credit facility, $3.5 billion, expiring June 2021 [Member] | Line of Credit [Member] | Berkshire Hathaway Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,500
Secured credit facility, C$500 million, expiring December 2023 [Member] | Line of Credit [Member] | AltaLink, L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 500
Secured credit facility, C$75 million, expiring December 2023 [Member] | Line of Credit [Member] | AltaLink, L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					75
Unsecured credit facility, C$300 million, expiring December 2023 [Member] | Line of Credit [Member] | AltaLink Investments, L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 300
Unsecured credit facility, $600 million, expiring September 2022 [Member] | Line of Credit [Member] | HomeServices [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Debt, Weighted Average Interest Rate		3.94%		3.94%	3.94%	2.75%
Unsecured credit facility, $985 million, expiring January 2019 to December 2019 [Member] | Line of Credit [Member] | HomeServices [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 985
Debt, Weighted Average Interest Rate		4.42%		4.42%	4.42%
Short-term debt		$ 436
Unsecured credit facility, $1 billion, expiring January 2018 to December 2018 [Member] | Line of Credit [Member] | HomeServices [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 1,000
Debt, Weighted Average Interest Rate						3.60%
Short-term debt						$ 440
Line of Credit [Member] | Secured credit facility, $250 million, expiring June 2021 [Member] | Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65		0.65	0.65
Line of Credit Facility, Maximum Borrowing Capacity		$ 250
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2]	(2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.

Short-Term Debt and Credit Fa_4

Short-Term Debt and Credit Faciliites (Details) £ in Millions, $ in Millions, $ in Millions		Dec. 31, 2018USD ($)		Dec. 31, 2018GBP (£)	Dec. 31, 2018CAD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114				$ 9,051
Line of Credit Facility, Amounts Supported	[1]	(543)				(594)
Short-term Debt	[1]	(2,516)				(4,488)
Berkshire Hathaway Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,500	[2]			3,600
Letters of Credit Outstanding, Amount		115				96
Line of Credit Facility, Amounts Supported		0				(7)
Short-term Debt		$ (983)				$ (3,331)
Berkshire Hathaway Energy [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.76%		2.76%	2.76%	1.74%
Debt to capitalization ratio		0.70		0.70	0.70
Berkshire Hathaway Energy [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported						$ (7)
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,200	[2]			1,000
Line of Credit Facility, Amounts Supported		(89)				(130)
Short-term Debt		$ (30)				$ (80)	$ (270)	$ (20)	$ (20)
PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.85%		2.85%	2.85%	1.83%
Debt to capitalization ratio		0.65		0.65	0.65
MidAmerican Energy Company and Subsidiaries [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,305				$ 905
Line of Credit Facility, Amounts Supported		(370)				(370)
Short-term Debt		$ (240)				0
MidAmerican Energy Company and Subsidiaries [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65		0.65	0.65
MidAmerican Funding [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,309	[2]			909
Line of Credit Facility, Amounts Supported		(370)				(370)
Short-term Debt		$ (240)				0
MidAmerican Funding [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.49%		2.49%	2.49%
Debt to capitalization ratio		0.65		0.65	0.65
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250				250
Line of Credit Facility, Amounts Supported		(80)				(80)
Northern Powergrid Holdings [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		231	[2]			203
Line of Credit Facility, Amounts Supported		0				0
Short-term Debt		$ (77)				$ 0
AltaLink, L.P. [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.26%		2.26%	2.26%	1.42%
Debt to capitalization ratio		0.75		0.75	0.75
Short-term Debt		$ (281)				$ (121)
ALP Investments [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		3.25%		3.25%	3.25%	2.40%
Debt to capitalization ratio		0.8		0.8	0.8
Short-term Debt		$ (64)				$ (224)
EBITDA to interest expense ratio		2.25		2.25	2.25
ALP Investments [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 10
HomeServices [Member]
Line of Credit Facility [Line Items]
Short-term Debt		$ (404)				(292)
BHE Renewables [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		103				$ 118
Unsecured credit facility, $600 million, expiring June 2021, extended [Member] | PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Northern Powergrid Holdings [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £				£ 150
Debt to regulated asset value		0.8		0.8	0.8
Interest Coverage Ratio		2.5		2.5	2.5
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Northern Powergrid (Northeast) Limited [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to regulated asset value		0.65		0.65	0.65
Unsecured credit facility, £150 million, expiring April 2020 [Member] | Northern Powergrid (Yorkshire) plc [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to regulated asset value		0.65		0.65	0.65
Unsecured credit facility, $600 million, expiring June 2021, increased and extended [Member] | PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Unsecured credit facility, $900 million, expiring June 2021 [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		900
Unsecured credit facility, $400 million, expiring November 2019 [Member] | MidAmerican Funding [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		400
Unsecured credit facility, $3.5 billion, expiring June 2021 [Member] | Berkshire Hathaway Energy [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,500
Unsecured credit facility, $600 million, expiring September 2022 [Member] | HomeServices [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Debt, Weighted Average Interest Rate		3.94%		3.94%	3.94%	2.75%
Unsecured credit facility, $985 million, expiring January 2019 to December 2019 [Member] | HomeServices [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 985
Debt, Weighted Average Interest Rate		4.42%		4.42%	4.42%
Short-term Debt		$ (436)
Unsecured credit facility, $1 billion, expiring January 2018 to December 2018 [Member] | HomeServices [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 1,000
Debt, Weighted Average Interest Rate						3.60%
Short-term Debt						$ (440)
Secured credit facility, C$500 million, expiring December 2023 [Member] | AltaLink, L.P. [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 500
Secured credit facility, C$75 million, expiring December 2023 [Member] | AltaLink, L.P. [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					75
Unsecured credit facility, C$300 million, expiring December 2023 [Member] | ALP Investments [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 300
Line of Credit [Member] | Secured credit facility, $250 million, expiring June 2021 [Member] | Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250
Debt to capitalization ratio		0.65		0.65	0.65
Line of Credit [Member] | Senior unsecured credit facility, $400 million, expiring June 2020 [Member] | Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Debt to capitalization ratio		1		1	1
Line of Credit [Member] | Secured credit facility, $400 million, expiring June 2021 [Member] | Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Debt to capitalization ratio		0.65		0.65	0.65
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2]	(2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.

Short-Term Debt and Credit Fa_5

Short-Term Debt and Credit Facilities Short-Term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Short-term debt	[1]	$ 2,516	$ 4,488
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

Short-Term Debt and Credit Fa_6

Short-Term Debt and Credit Facilities - PacifiCorp - Credit Facility (Details) $ in Millions		Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114		$ 9,051
Short-term Debt	[1]	(2,516)		(4,488)
Line of Credit Facility, Amounts Supported	[1]	(543)		(594)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	6,055		3,969
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,200	[2]	1,000
Short-term Debt		(30)		(80)	$ (270)	$ (20)	$ (20)
Line of Credit Facility, Amounts Supported		(89)		(130)
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,081		$ 790
PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.85%		1.83%
Debt to capitalization ratio		0.65
PacifiCorp [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.85%		1.83%
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2021, extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2021, increased and extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		600
PacifiCorp [Member] | Certain transactions required by third parties [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		(14)
PacifiCorp [Member] | Tax exempt bond obligations and commodity contract collateral requirement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		(170)		$ (216)
Letters of Credit Outstanding, Amount		$ 184		$ 230
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2]	(2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.

Short-Term Debt and Credit Fa_7

Short-Term Debt and Credit Facilities - MEC - Credit Facility (Details) $ in Millions		Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114		$ 9,051
Short-term Debt	[1]	(2,516)		(4,488)
Line of Credit Facility, Amounts Supported	[1]	(543)		(594)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	6,055		3,969
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,305		905
Short-term Debt		(240)		0
Line of Credit Facility, Amounts Supported		(370)		(370)
Line of Credit Facility, Remaining Borrowing Capacity		$ 695		535
MidAmerican Energy Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65
MidAmerican Energy Company [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.49%
Regulatory Approval for Additional Short-Term Debt Issuances		$ 1,305
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring June 2021 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		900
MidAmerican Energy Company [Member] | Unsecured 364-day Credit Facility, $5 million, expiring June [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		5
MidAmerican Funding [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,309	[2]	909
Short-term Debt		(240)		0
Line of Credit Facility, Amounts Supported		(370)		(370)
Line of Credit Facility, Remaining Borrowing Capacity		$ 699		$ 539
MidAmerican Funding [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		2.49%
Debt to capitalization ratio		0.65
MidAmerican Funding [Member] | Unsecured credit facility, $400 million, expiring November 2019 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2]	(2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.

Short-Term Debt and Credit Fa_8

Short-Term Debt and Credit Facilities - MidAmerican Funding (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114	$ 9,051
MidAmerican Funding, LLC and Subsidiaries [Domain] | Unsecured 364-day credit facility, $4 million, expiring June [Member] | MHC, Inc. [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		4
Outstanding balance on credit facility		$ 0	$ 0
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

Short-Term Debt and Credit Fa_9

Short-Term Debt and Credit Facilities - NPC - Credit Facility (Details)		Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114,000,000	$ 9,051,000,000
Nevada Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit		0	0
Nevada Power Company [Member] | Senior unsecured credit facility, $400 million, expiring June 2020 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000,000
Debt to capitalization ratio		1
Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2021 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000,000
Debt to capitalization ratio		0.65
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250,000,000	250,000,000
Sierra Pacific Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit		0	$ 0
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2021 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250,000,000
Debt to capitalization ratio		0.65
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

Short-Term Debt and Credit F_10

Short-Term Debt and Credit Facilities - SPPC - Credit Facility (Details)		Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114,000,000	$ 9,051,000,000
Line of Credit Facility, Amounts Supported	[1]	(543,000,000)	(594,000,000)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	6,055,000,000	3,969,000,000
Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		250,000,000	250,000,000
Line of Credit Facility, Amounts Supported		(80,000,000)	(80,000,000)
Line of Credit Facility, Remaining Borrowing Capacity		170,000,000	170,000,000
Sierra Pacific Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit		0	$ 0
Secured credit facility, $250 million, expiring June 2021 [Member] | Sierra Pacific Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250,000,000
Debt to capitalization ratio		0.65
Minimum [Member] | Secured credit facility, $250 million, expiring June 2021 [Member] | Sierra Pacific Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		0.65
Maximum [Member] | Secured credit facility, $250 million, expiring June 2021 [Member] | Sierra Pacific Power Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio		1
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

BHE Debt (Details)

BHE Debt (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
BHE Debt [Line Items]
Par value		$ 37,014
Noncurrent senior debt		8,577	$ 5,452
BHE junior subordinated debentures		100	100
Berkshire Hathaway Energy [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
BHE Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Conversion of Stock, Shares Converted	181,819
Senior Notes [Member] | Berkshire Hathaway Energy [Member]
BHE Debt [Line Items]
Par value		8,651
Total BHE Senior Debt		8,577	6,452
Current senior debt		0	1,000
Noncurrent senior debt		8,577	5,452
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 5.75%, Senior Notes, due 2018 [Member]
BHE Debt [Line Items]
Par value		0
Total BHE Senior Debt		$ 0	$ 650
Debt Instrument, Interest Rate, Stated Percentage		0.00%	5.75%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 2.00%, Senior Notes, due 2018 [Member]
BHE Debt [Line Items]
Par value		$ 0
Total BHE Senior Debt		$ 0	$ 350
Debt Instrument, Interest Rate, Stated Percentage		0.00%	2.00%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 2.40% Senior Notes, due 2020 [Member]
BHE Debt [Line Items]
Par value		$ 350
Total BHE Senior Debt		$ 349	$ 349
Debt Instrument, Interest Rate, Stated Percentage		2.40%	2.40%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.375%, due 2021 [Member]
BHE Debt [Line Items]
Par value		$ 450
Total BHE Senior Debt		$ 448	$ 0
Debt Instrument, Interest Rate, Stated Percentage		2.375%	0.00%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.800%, due 2023 [Member]
BHE Debt [Line Items]
Par value		$ 400
Total BHE Senior Debt		$ 398	$ 0
Debt Instrument, Interest Rate, Stated Percentage		2.80%	0.00%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 3.75%, Senior Notes, due 2023 [Member]
BHE Debt [Line Items]
Par value		$ 500
Total BHE Senior Debt		$ 498	$ 498
Debt Instrument, Interest Rate, Stated Percentage		3.75%	3.75%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 3.50% Senior Notes, due 2025 [Member]
BHE Debt [Line Items]
Par value		$ 400
Total BHE Senior Debt		$ 398	$ 398
Debt Instrument, Interest Rate, Stated Percentage		3.50%	3.50%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.250%, due 2028 [Member]
BHE Debt [Line Items]
Par value		$ 600
Total BHE Senior Debt		$ 594	$ 0
Debt Instrument, Interest Rate, Stated Percentage		3.25%	0.00%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 8.48%, Senior Notes, due 2028 [Member]
BHE Debt [Line Items]
Par value		$ 256
Total BHE Senior Debt		$ 257	$ 302
Debt Instrument, Interest Rate, Stated Percentage		8.48%	8.48%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 6.125%, Senior Bonds, due 2036 [Member]
BHE Debt [Line Items]
Par value		$ 1,670
Total BHE Senior Debt		$ 1,661	$ 1,660
Debt Instrument, Interest Rate, Stated Percentage		6.125%	6.125%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 5.95%, Senior Bonds, due 2037 [Member]
BHE Debt [Line Items]
Par value		$ 550
Total BHE Senior Debt		$ 547	$ 547
Debt Instrument, Interest Rate, Stated Percentage		5.95%	5.95%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 6.50%, Senior Bonds, due 2037 [Member]
BHE Debt [Line Items]
Par value		$ 225
Total BHE Senior Debt		$ 222	$ 222
Debt Instrument, Interest Rate, Stated Percentage		6.50%	6.50%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 5.15%, Senior Notes, due 2043 [Member]
BHE Debt [Line Items]
Par value		$ 750
Total BHE Senior Debt		$ 740	$ 739
Debt Instrument, Interest Rate, Stated Percentage		5.15%	5.15%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | 4.50% Senior Notes, due 2045 [Member]
BHE Debt [Line Items]
Par value		$ 750
Total BHE Senior Debt		$ 738	$ 737
Debt Instrument, Interest Rate, Stated Percentage		4.50%	4.50%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.80%, due 2048 [Member]
BHE Debt [Line Items]
Par value		$ 750
Total BHE Senior Debt		$ 737	$ 0
Debt Instrument, Interest Rate, Stated Percentage		3.80%	0.00%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 4.45%, due 2049 [Member]
BHE Debt [Line Items]
Par value		$ 1,000
Total BHE Senior Debt		$ 990	$ 0
Debt Instrument, Interest Rate, Stated Percentage		4.45%	0.00%
Junior Subordinated Debt [Member] | Berkshire Hathaway Energy [Member]
BHE Debt [Line Items]
Par value		$ 100
BHE junior subordinated debentures		100	$ 100
Junior Subordinated Debt [Member] | Berkshire Hathaway Energy [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
BHE Debt [Line Items]
Par value		100
BHE junior subordinated debentures		$ 100	$ 100
Debt Instrument, Interest Rate, Stated Percentage		5.00%	5.00%
Interest Expense, Debt		$ 5	$ 3

Subsidiary Debt - Summary (Deta

Subsidiary Debt - Summary (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Other Long-term Debt, Noncurrent		25,991	$ 26,210
NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318	4,581
Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Par value	[1]	2,621
Other long-term debt		2,626	2,805
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	28,641
Other Long-term Debt, Current		2,106	2,431
Other Long-term Debt, Noncurrent		25,991	26,210
Subsidiary Debt [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Par value		7,076
Other long-term debt		7,036	7,025
Subsidiary Debt [Member] | MidAmerican Funding [Member]
Debt Instrument [Line Items]
Par value		5,668
Other long-term debt		5,599	5,259
Subsidiary Debt [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318	4,581
Subsidiary Debt [Member] | Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Par value		2,621
Other long-term debt		2,626	2,805
Subsidiary Debt [Member] | BHE Pipeline Group [Member]
Debt Instrument [Line Items]
Par value		1,050
Other long-term debt		1,042	796
Subsidiary Debt [Member] | BHE Transmission [Member]
Debt Instrument [Line Items]
Par value	[2]	3,856
Other long-term debt		3,842	4,334
Subsidiary Debt [Member] | BHE Renewables [Member]
Debt Instrument [Line Items]
Par value		3,438
Other long-term debt		3,401	3,594
Subsidiary Debt [Member] | HomeServices [Member]
Debt Instrument [Line Items]
Par value		233
Other long-term debt		$ 233	$ 247
[1]	(1)The par values for these debt instruments are denominated in sterling.
[2]	ns): Par Value(1) 2018 2017AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019$147 $148 $162Series 13-1 Senior Bonds, 3.265%, due 2020147 148 161Series 15-1 Senior Bonds, 2.244%, due 2022147 146 158Total AltaLink Investments, L.P.441 442 481 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018— — 159Series 2013-2 Notes, 3.621%, due 202092 92 99Series 2012-2 Notes, 2.978%, due 2022202 201 218Series 2013-4 Notes, 3.668%, due 2023366 366 397Series 2014-1 Notes, 3.399%, due 2024256 256 278Series 2016-1 Notes, 2.747%, due 2026256 255 277Series 2006-1 Notes, 5.249%, due 2036110 109 119Series 2010-1 Notes, 5.381%, due 204092 91 99Series 2010-2 Notes, 4.872%, due 2040110 109 119Series 2011-1 Notes, 4.462%, due 2041202 201 218Series 2012-1 Notes, 3.990%, due 2042385 380 412Series 2013-3 Notes, 4.922%, due 2043256 256 278Series 2014-3 Notes, 4.054%, due 2044216 215 233Series 2015-1 Notes, 4.090%, due 2045256 255 277Series 2016-2 Notes, 3.717%, due 2046330 328 356Series 2013-1 Notes, 4.446%, due 2053183 183 198Series 2014-2 Notes, 4.274%, due 206495 95 103Total AltaLink, L.P.3,407 3,392 3,840 Other: Construction Loan, 5.660%, due 20208 8 13 Total BHE Transmission$3,856 $3,842 $4,334(1)The par values for these debt instruments are denominated in Canadian dollars.

Subsidiary Debt - Maturity Sche

Subsidiary Debt - Maturity Schedule (Details) $ in Millions	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two	2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five	2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,058
Par Value	37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par Value	28,263
PacifiCorp [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	352
Long-term Debt, Maturities, Repayments of Principal in Year Two	40
Long-term Debt, Maturities, Repayments of Principal in Year Three	425
Long-term Debt, Maturities, Repayments of Principal in Year Four	606
Long-term Debt, Maturities, Repayments of Principal in Year Five	450
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,203
Par Value	7,076
MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	500
Long-term Debt, Maturities, Repayments of Principal in Year Two	2
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	1
Long-term Debt, Maturities, Repayments of Principal in Year Five	315
Long-term Debt, Maturities, Repayments of Principal after Year Five	4,850
Par Value	5,668
NV Energy [Member]
Debt Instrument [Line Items]
Par Value	4,321
NV Energy [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	523
Long-term Debt, Maturities, Repayments of Principal in Year Two	913
Long-term Debt, Maturities, Repayments of Principal in Year Three	28
Long-term Debt, Maturities, Repayments of Principal in Year Four	29
Long-term Debt, Maturities, Repayments of Principal in Year Five	271
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,557
Par Value	4,321
Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Par Value	2,621	[1]
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	80
Long-term Debt, Maturities, Repayments of Principal in Year Two	462
Long-term Debt, Maturities, Repayments of Principal in Year Three	31
Long-term Debt, Maturities, Repayments of Principal in Year Four	479
Long-term Debt, Maturities, Repayments of Principal in Year Five	33
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,536
Par Value	2,621
BHE Pipeline Group [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	200
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	850
Par Value	1,050
BHE Transmission [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	148
Long-term Debt, Maturities, Repayments of Principal in Year Two	245
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	348
Long-term Debt, Maturities, Repayments of Principal in Year Five	367
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,748
Par Value	3,856	[2]
BHE Renewables [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	483
Long-term Debt, Maturities, Repayments of Principal in Year Two	168
Long-term Debt, Maturities, Repayments of Principal in Year Three	175
Long-term Debt, Maturities, Repayments of Principal in Year Four	172
Long-term Debt, Maturities, Repayments of Principal in Year Five	177
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,263
Par Value	3,438
HomeServices [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	20
Long-term Debt, Maturities, Repayments of Principal in Year Two	27
Long-term Debt, Maturities, Repayments of Principal in Year Three	33
Long-term Debt, Maturities, Repayments of Principal in Year Four	153
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	0
Par Value	233
Berkshire Hathaway Energy [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	350
Long-term Debt, Maturities, Repayments of Principal in Year Three	450
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	900
Long-term Debt, Maturities, Repayments of Principal after Year Five	6,951
Par Value	8,651
Berkshire Hathaway Energy [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	100
Par Value	$ 100
[1]	(1)The par values for these debt instruments are denominated in sterling.
[2]	ns): Par Value(1) 2018 2017AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019$147 $148 $162Series 13-1 Senior Bonds, 3.265%, due 2020147 148 161Series 15-1 Senior Bonds, 2.244%, due 2022147 146 158Total AltaLink Investments, L.P.441 442 481 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018— — 159Series 2013-2 Notes, 3.621%, due 202092 92 99Series 2012-2 Notes, 2.978%, due 2022202 201 218Series 2013-4 Notes, 3.668%, due 2023366 366 397Series 2014-1 Notes, 3.399%, due 2024256 256 278Series 2016-1 Notes, 2.747%, due 2026256 255 277Series 2006-1 Notes, 5.249%, due 2036110 109 119Series 2010-1 Notes, 5.381%, due 204092 91 99Series 2010-2 Notes, 4.872%, due 2040110 109 119Series 2011-1 Notes, 4.462%, due 2041202 201 218Series 2012-1 Notes, 3.990%, due 2042385 380 412Series 2013-3 Notes, 4.922%, due 2043256 256 278Series 2014-3 Notes, 4.054%, due 2044216 215 233Series 2015-1 Notes, 4.090%, due 2045256 255 277Series 2016-2 Notes, 3.717%, due 2046330 328 356Series 2013-1 Notes, 4.446%, due 2053183 183 198Series 2014-2 Notes, 4.274%, due 206495 95 103Total AltaLink, L.P.3,407 3,392 3,840 Other: Construction Loan, 5.660%, due 20208 8 13 Total BHE Transmission$3,856 $3,842 $4,334(1)The par values for these debt instruments are denominated in Canadian dollars.

Subsidiary Debt Subsidiary Debt

Subsidiary Debt Subsidiary Debt - Pacificorp (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Par value		$ 37,014
Long-term Debt		36,774	$ 35,193
PacifiCorp [Member]
Debt Instrument [Line Items]
Long-term Debt		7,015	7,005
Long-term Debt and Capital Lease Obligations, Principal Amount		7,076
Current portion of long-term debt and capital lease obligations		352	588	$ 58	$ 68	$ 134
Long-term debt and capital lease obligations		6,684	6,437	$ 7,021	$ 7,078	$ 6,885
Total long-term debt and capital lease obligations		7,036	7,025
Maximum amount of additional long-term debt approved by regulators		2,000
Eligible Property Subject To Lien Of Mortgages		28,000
Capital Leases, Balance Sheet, Assets by Major Class, Net		21	20
PacifiCorp [Member] | Letters of credit supporting tax-exempt bond obligations [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		170	$ 216
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member]
Debt Instrument [Line Items]
Par value		$ 1,824
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.48%	4.73%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.95%	2.95%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.53%	8.53%
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]
Debt Instrument [Line Items]
Par value		$ 775
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.92%	3.92%
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.35%	3.35%
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.71%	6.71%
PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]
Debt Instrument [Line Items]
Par value		$ 300
Long-term Debt, Weighted Average Interest Rate, at Point in Time		7.70%	7.70%
Debt Instrument, Interest Rate, Stated Percentage		7.70%	7.70%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member]
Debt Instrument [Line Items]
Par value		$ 2,350
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.96%	5.96%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%	5.25%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.35%	6.35%
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]
Debt Instrument [Line Items]
Par value		$ 950
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.40%	5.40%
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.10%	4.10%
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.00%	6.00%
PacifiCorp [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member]
Debt Instrument [Line Items]
Par value		$ 600
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.13%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2020 [Member]
Debt Instrument [Line Items]
Par value		$ 38
Long-term Debt, Weighted Average Interest Rate, at Point in Time		1.85%	1.77%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 25
Long-term Debt, Weighted Average Interest Rate, at Point in Time	[1]	1.75%	1.81%
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]
Debt Instrument [Line Items]
Par value	[1],[2]	$ 143
Long-term Debt, Weighted Average Interest Rate, at Point in Time	[1],[2]	1.68%	1.73%
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]
Debt Instrument [Line Items]
Par value	[2]	$ 50
Long-term Debt, Weighted Average Interest Rate, at Point in Time	[2]	1.75%	1.72%
PacifiCorp [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Par value		$ 7,055
Long-term Debt		$ 7,015	$ 7,005
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		10.55%	11.46%
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.75%	8.75%
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		14.61%	14.61%
PacifiCorp [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Par value		$ 7,076
Other long-term debt		7,036	$ 7,025
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		1,821	2,320
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt		771	771
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt		298	298
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member]
Debt Instrument [Line Items]
Long-term Debt		2,338	2,337
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]
Debt Instrument [Line Items]
Long-term Debt		939	938
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member]
Debt Instrument [Line Items]
Long-term Debt		593	0
PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt		38	79
PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	[1]	25	70
PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	[1],[2]	142	142
PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	[2]	50	50
PacifiCorp [Member] | PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Capital Lease Obligations		21	20
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	28,641
Subsidiary Debt [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Par value		7,076
Other long-term debt		$ 7,036	$ 7,025
Subsidiary Debt [Member] | PacifiCorp [Member] | Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.67%	1.60%
Subsidiary Debt [Member] | PacifiCorp [Member] | Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.85%	1.87%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.95%	2.95%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.53%	8.53%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.35%	3.35%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.71%	6.71%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.70%	7.70%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%	5.25%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.35%	6.35%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.10%	4.10%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.00%	6.00%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.125%
Subsidiary Debt [Member] | PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.75%	8.75%
Subsidiary Debt [Member] | PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		14.61%	14.61%
[1]	Supported by $170 million and $216 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018 and 2017, respectively.
[2]	Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.

Subsidiary Debt Subsidiary De_2

Subsidiary Debt Subsidiary Debt - PacifiCorp - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two	2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five	2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,058
Par value	37,014
Long-term Debt	36,774	$ 35,193
PacifiCorp [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	354
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	41
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	427
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	608
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	451
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	5,209
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments	7,090
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(40)
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments	(14)
Long-term Debt	7,015	7,005
Total long-term debt and capital lease obligations	7,036	$ 7,025
PacifiCorp [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	350
Long-term Debt, Maturities, Repayments of Principal in Year Two	38
Long-term Debt, Maturities, Repayments of Principal in Year Three	420
Long-term Debt, Maturities, Repayments of Principal in Year Four	605
Long-term Debt, Maturities, Repayments of Principal in Year Five	449
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,193
Par value	7,055
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(40)
Long-term Debt	7,015
PacifiCorp [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	4
Capital Leases, Future Minimum Payments Due in Two Years	3
Capital Leases, Future Minimum Payments Due in Three Years	7
Capital Leases, Future Minimum Payments Due in Four Years	3
Capital Leases, Future Minimum Payments Due in Five Years	2
Capital Leases, Future Minimum Payments Due Thereafter	16
Capital Leases, Future Minimum Payments Due	35
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	0
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments	14
Capital Lease Obligations	$ 21

Subsidiary Debt - MidAmerican F

Subsidiary Debt - MidAmerican Funding (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 01, 2019	Jan. 31, 2019
Debt Instrument [Line Items]
Par value		$ 37,014
Equity Restrictions		16,500
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	$ 28,641
MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		5,668
Other long-term debt		5,599	5,259
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Par value		5,428
Other long-term debt		5,381	5,042
Eligible Property Subject To Lien Of Mortgages		18,000
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value		500
Other long-term debt		$ 500	$ 499
Debt Instrument, Interest Rate, Stated Percentage		2.40%	2.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value		$ 250
Other long-term debt		$ 249	$ 248
Debt Instrument, Interest Rate, Stated Percentage		3.70%	3.70%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value		$ 500
Other long-term debt		$ 500	$ 501
Debt Instrument, Interest Rate, Stated Percentage		3.50%	3.50%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value		$ 375
Other long-term debt		372	$ 372
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value		350
Other long-term debt		$ 346	$ 346
Debt Instrument, Interest Rate, Stated Percentage		4.80%	4.80%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value		$ 400
Other long-term debt		$ 395	$ 394
Debt Instrument, Interest Rate, Stated Percentage		4.40%	4.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value		$ 450
Other long-term debt		$ 445	$ 445
Debt Instrument, Interest Rate, Stated Percentage		4.25%	4.25%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value		$ 475
Other long-term debt		470	$ 470
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value		700
Other long-term debt		688	0
MidAmerican Energy Company [Member] | MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Par value		0
Other long-term debt		0	$ 350
Debt Instrument, Interest Rate, Stated Percentage			5.30%
MidAmerican Energy Company [Member] | MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value		400
Other long-term debt		$ 396	$ 396
Debt Instrument, Interest Rate, Stated Percentage		6.75%	6.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value		$ 300
Other long-term debt		$ 298	$ 298
Debt Instrument, Interest Rate, Stated Percentage		5.75%	5.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value		$ 350
Other long-term debt		$ 347	$ 347
Debt Instrument, Interest Rate, Stated Percentage		5.80%	5.80%
MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value		$ 6
Other long-term debt		5	$ 6
MidAmerican Energy Company [Member] | Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Par value		2
Other long-term debt		$ 2	$ 2
Debt Instrument, Interest Rate, Stated Percentage		4.16%	4.16%
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Equity Restrictions		$ 3,900
MidAmerican Funding LLC [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Gain (Loss), Net of Tax			$ 29
MidAmerican Funding LLC [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Par value		240
Other long-term debt		$ 217	$ 216
Debt Instrument, Interest Rate, Stated Percentage		6.927%	6.927%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		$ 5,428
Other long-term debt		5,382	$ 5,043
Eligible Property Subject To Lien Of Mortgages		18,000
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Tax-exempt bond obligations, variable rate, due 2023-2047 [Member]
Debt Instrument [Line Items]
Par value		370
Other long-term debt		$ 368	$ 368
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.74%	1.91%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value		$ 500
Other long-term debt		$ 500	$ 499
Debt Instrument, Interest Rate, Stated Percentage		2.40%	2.40%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value		$ 250
Other long-term debt		$ 249	$ 248
Debt Instrument, Interest Rate, Stated Percentage		3.70%	3.70%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value		$ 500
Other long-term debt		$ 501	$ 501
Debt Instrument, Interest Rate, Stated Percentage		3.50%	3.50%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value		$ 375
Other long-term debt		$ 372	$ 372
Debt Instrument, Interest Rate, Stated Percentage		3.10%	3.10%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value		$ 350
Other long-term debt		$ 346	$ 346
Debt Instrument, Interest Rate, Stated Percentage		4.80%	4.80%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value		$ 400
Other long-term debt		$ 394	$ 394
Debt Instrument, Interest Rate, Stated Percentage		4.40%	4.40%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value		$ 450
Other long-term debt		$ 445	$ 445
Debt Instrument, Interest Rate, Stated Percentage		4.25%	4.25%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value		$ 475
Other long-term debt		$ 470	$ 470
Debt Instrument, Interest Rate, Stated Percentage		3.95%	3.95%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value		$ 700
Other long-term debt		$ 688	$ 0
Debt Instrument, Interest Rate, Stated Percentage		3.65%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Par value		$ 0
Other long-term debt		$ 0	$ 350
Debt Instrument, Interest Rate, Stated Percentage		5.30%	5.30%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value		$ 400
Other long-term debt		$ 396	$ 396
Debt Instrument, Interest Rate, Stated Percentage		6.75%	6.75%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value		$ 300
Other long-term debt		$ 298	$ 298
Debt Instrument, Interest Rate, Stated Percentage		5.75%	5.75%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value		$ 350
Other long-term debt		$ 348	$ 348
Debt Instrument, Interest Rate, Stated Percentage		5.80%	5.80%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value		$ 7
Other long-term debt		5	$ 6
Vendor Financing, Discount Rate Applied			4.45%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Par value		1
Other long-term debt		2	$ 2
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Par value		$ 180
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied		4.16%	4.16%
MidAmerican Funding LLC [Member] | MidAmerican Funding LLC [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Par value		$ 239
Other long-term debt		$ 240
Debt Instrument, Interest Rate, Stated Percentage		6.927%
Minimum [Member] | MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied		3.42%
Minimum [Member] | MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied		3.42%
Maximum [Member] | MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied		4.45%
Maximum [Member] | MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied		4.45%
Subsequent Event [Member] | MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 500
Subsequent Event [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65%, Due April 2029 [Member]
Debt Instrument [Line Items]
Par value					$ 600
Debt Instrument, Interest Rate, Stated Percentage					3.65%
Subsequent Event [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due July 2049 [Member]
Debt Instrument [Line Items]
Par value					$ 900
Debt Instrument, Interest Rate, Stated Percentage					4.25%
Subsequent Event [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.40%			2.40%
Committed Common Equity Percentage To Regulators Beyond Companies Control [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage below which reasonable efforts to maintain agreed to percentage is not required		39.00%

Subsidiary Debt Subsidiary De_3

Subsidiary Debt Subsidiary Debt - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2019	Feb. 01, 2019	Jan. 31, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Par value	$ 37,014
Restricted Cash and Cash Equivalents, Current	227				$ 327
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Par value	5,428
Other long-term debt	5,381				5,042
Eligible Property Subject To Lien Of Mortgages	18,000
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value	500
Other long-term debt	$ 500				$ 499
Debt Instrument, Interest Rate, Stated Percentage	2.40%				2.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value	$ 250
Other long-term debt	$ 249				$ 248
Debt Instrument, Interest Rate, Stated Percentage	3.70%				3.70%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 500				$ 501
Debt Instrument, Interest Rate, Stated Percentage	3.50%				3.50%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value	$ 375
Other long-term debt	372				$ 372
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value	350
Other long-term debt	$ 346				$ 346
Debt Instrument, Interest Rate, Stated Percentage	4.80%				4.80%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 395				$ 394
Debt Instrument, Interest Rate, Stated Percentage	4.40%				4.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value	$ 450
Other long-term debt	$ 445				$ 445
Debt Instrument, Interest Rate, Stated Percentage	4.25%				4.25%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value	$ 475
Other long-term debt	470				$ 470
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value	700
Other long-term debt	688				0
MidAmerican Energy Company [Member] | MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Par value	0
Other long-term debt	0				$ 350
Debt Instrument, Interest Rate, Stated Percentage					5.30%
MidAmerican Energy Company [Member] | MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value	400
Other long-term debt	$ 396				$ 396
Debt Instrument, Interest Rate, Stated Percentage	6.75%				6.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value	$ 300
Other long-term debt	$ 298				$ 298
Debt Instrument, Interest Rate, Stated Percentage	5.75%				5.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 347				$ 347
Debt Instrument, Interest Rate, Stated Percentage	5.80%				5.80%
MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 6
Other long-term debt	$ 5				$ 6
MidAmerican Energy Company [Member] | Tax-exempt bond obligations, variable rate, due 2016-2046 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.74%
MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligation, 4.449%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied					4.45%
MidAmerican Energy Company [Member] | Variable Rate Tax Exempt Obligation Series due 2023, issued 1993 [Member]
Debt Instrument [Line Items]
Par value	$ 7
Other long-term debt	7				$ 7
MidAmerican Energy Company [Member] | Variable Rate Tax Exempt Obligation Series Due 2023, issued in 2008 [Member]
Debt Instrument [Line Items]
Par value	57
Other long-term debt	57				57
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]
Debt Instrument [Line Items]
Par value	35
Other long-term debt	35				35
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2025 [Member]
Debt Instrument [Line Items]
Par value	13
Other long-term debt	13				13
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	33
Other long-term debt	33				33
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2038 [Member]
Debt Instrument [Line Items]
Par value	45
Other long-term debt	45				45
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2046 [Member]
Debt Instrument [Line Items]
Par value	30
Other long-term debt	29				29
MidAmerican Energy Company [Member] | Variable Rate Tax Exempt Obligation Series Due 2047 [Member]
Debt Instrument [Line Items]
Par value	150
Other long-term debt	149				149
MidAmerican Energy Company [Member] | Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Par value	2
Other long-term debt	$ 2				$ 2
Debt Instrument, Interest Rate, Stated Percentage	4.16%				4.16%
MidAmerican Energy Company [Member] | Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate					1.91%
MidAmerican Energy Company [Member] | Committed Common Equity Percentage To Regulators [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage	42.00%
MidAmerican Energy Company [Member] | Committed Common Equity Percentage To Regulators Beyond Companies Control [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage below which reasonable efforts to maintain agreed to percentage is not required	39.00%
MidAmerican Energy Company [Member] | Dividend Restriction For Common Equity Commitment [Member]
Debt Instrument [Line Items]
Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements	$ 2,500
MidAmerican Energy Company [Member] | Common Equity Level To Total Capitalization [Member]
Debt Instrument [Line Items]
Common Equity Level To Total Capitalization	53.00%
MidAmerican Energy Company [Member] | Maximum [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%
MidAmerican Energy Company [Member] | Minimum [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%
MidAmerican Energy Company [Member] | Subsequent Event [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65%, Due April 2029 [Member]
Debt Instrument [Line Items]
Par value				$ 600
Debt Instrument, Interest Rate, Stated Percentage				3.65%
MidAmerican Energy Company [Member] | Subsequent Event [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due July 2049 [Member]
Debt Instrument [Line Items]
Par value				$ 900
Debt Instrument, Interest Rate, Stated Percentage				4.25%
MidAmerican Energy Company [Member] | Subsequent Event [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 500
Debt Instrument, Interest Rate, Stated Percentage		2.40%	2.40%
MidAmerican Energy Company [Member] | Variable Rate Tax Exempt Obligation Series Due 2047 [Member]
Debt Instrument [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 56

Subsidiary Debt Subsidiary De_4

Subsidiary Debt Subsidiary Debt - MEC - Maturity Schedule (Details) $ in Millions	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two	2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five	2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,058
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	500
Long-term Debt, Maturities, Repayments of Principal in Year Two	2
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	315
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 4,611

Subsidiary Debt - NV Energy (De

Subsidiary Debt - NV Energy (Details) - USD ($) $ in Millions		Feb. 01, 2019	Dec. 31, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Par value			$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			28,263
Other long-term debt			28,097		$ 28,641
PacifiCorp [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			7,076
Other long-term debt			7,036		7,025
Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Par value	[1]		2,621
Other long-term debt			2,626		2,805
Northern Powergrid Holdings [Member] | European Investment Bank loans, 2.564%, due 2027 [Member]
Debt Instrument [Line Items]
Par value	[1]		319
Other long-term debt			318		336
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			2,621
Other long-term debt			$ 2,626		$ 2,805
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 2.564%, due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.564%		2.564%
MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			$ 5,668
Other long-term debt			5,599		$ 5,259
NV Energy [Member]
Debt Instrument [Line Items]
Par value			4,321
Other long-term debt			4,318		4,581
NV Energy [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			4,321
Other long-term debt			4,318		4,581
BHE Pipeline Group [Member]
Debt Instrument [Line Items]
Par value			1,050
Other long-term debt			1,042		796
BHE Renewables [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			3,438
Other long-term debt			3,401		3,594
BHE Renewables [Member] | Subsidiary Debt [Member] | Marshall Wind term loan, variable interest rate, due 2026 [Member]
Debt Instrument [Line Items]
Par value	[2],[3]		83
Other long-term debt	[2],[3]		81		86
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]
Debt Instrument [Line Items]
Par value	[2]		396
Other long-term debt			392		404
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due September 2015 through September 2039 [Member]
Debt Instrument [Line Items]
Par value	[2]		207
Other long-term debt	[2]		205		217
HomeServices [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			233
Other long-term debt			$ 233		$ 247
HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.022%		2.819%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.67%		1.60%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.10%		4.10%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.95%		2.95%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.35%		3.35%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.125%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.85%		1.87%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.00%		6.00%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.53%		8.53%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.71%		6.71%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value			$ 5,428
Other long-term debt			5,382		$ 5,043
Eligible Property Subject To Lien Of Mortgages			18,000
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Tax-exempt bond obligations, variable rate, due 2023-2047 [Member]
Debt Instrument [Line Items]
Par value			370
Other long-term debt			$ 368		$ 368
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.74%		1.91%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value			$ 500
Other long-term debt			$ 501		$ 501
Debt Instrument, Interest Rate, Stated Percentage			3.50%		3.50%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value			$ 450
Other long-term debt			$ 445		$ 445
Debt Instrument, Interest Rate, Stated Percentage			4.25%		4.25%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value			$ 475
Other long-term debt			$ 470		$ 470
Debt Instrument, Interest Rate, Stated Percentage			3.95%		3.95%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value			$ 375
Other long-term debt			$ 372		$ 372
Debt Instrument, Interest Rate, Stated Percentage			3.10%		3.10%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value			$ 700
Other long-term debt			$ 688		$ 0
Debt Instrument, Interest Rate, Stated Percentage			3.65%
NV Energy, Inc. [Member] | NV Energy [Member] | Senior Notes, 6.250%, due 2020 [Member]
Debt Instrument [Line Items]
Par value			$ 315
Other long-term debt			$ 330		$ 337
NV Energy, Inc. [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Senior Notes, 6.250%, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.25%		6.25%
Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value			$ 2,847
Eligible Property Subject To Lien Of Mortgages			8,500
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Other long-term debt					$ 324
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Other long-term debt					499
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Other long-term debt					499
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Other long-term debt			574		0
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt			358		357
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Other long-term debt			346		346
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Other long-term debt			247		247
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Other long-term debt			236		236
Nevada Power Company [Member] | Subsidiary Debt [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Other long-term debt					475
Nevada Power Company [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Par value			2,847
Other long-term debt			2,829		3,088
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Par value			0
Other long-term debt			0		324
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Par value			0
Other long-term debt			0		499
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Par value			500
Other long-term debt			500		499
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Par value			575
Other long-term debt			574		0
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Par value			367
Other long-term debt			360		359
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Par value			349
Other long-term debt			348		348
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Par value			250
Other long-term debt			248		248
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Par value			250
Other long-term debt			244		244
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Par value	[4]		40
Other long-term debt	[4]		40		40
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Par value	[4]		40
Other long-term debt	[4]		39		39
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Par value	[4]		13
Other long-term debt	[4]		$ 13		$ 13
Debt Instrument, Interest Rate, Stated Percentage			1.60%		1.60%
Nevada Power Company [Member] | NV Energy [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Par value			$ 463
Other long-term debt			$ 463		$ 475
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.50%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.50%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			7.125%		7.125%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.75%		2.75%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.65%		6.65%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.75%		6.75%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.375%		5.375%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.45%		5.45%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.80%		1.80%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.60%		1.60%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.60%		1.60%
Nevada Power Company [Member] | Minimum [Member] | NV Energy [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.75%		2.75%
Nevada Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.75%		2.75%
Nevada Power Company [Member] | Maximum [Member] | NV Energy [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			11.60%		11.60%
Nevada Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			11.60%		11.60%
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value			$ 1,159
Eligible Property Subject To Lien Of Mortgages			$ 4,100
Sierra Pacific Power Company [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.375%		3.375%
Sierra Pacific Power Company [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.75%		6.75%
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Other long-term debt			$ 249		$ 248
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Other long-term debt			396		396
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Other long-term debt			255		255
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]
Debt Instrument [Line Items]
Other long-term debt	[5]				20
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Other long-term debt	[5]				58
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt	[6]				63
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt					30
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt					25
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt					25
Sierra Pacific Power Company [Member] | Subsidiary Debt [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member]
Debt Instrument [Line Items]
Other long-term debt					34
Sierra Pacific Power Company [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Par value			1,159
Other long-term debt			1,159		1,156
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Par value			250
Other long-term debt			249		249
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Par value			400
Other long-term debt			396		396
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Par value			252
Other long-term debt			256		256
Sierra Pacific Power Company [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]
Debt Instrument [Line Items]
Par value	[5]		20
Other long-term debt			20	[5]	20
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Par value	[5]		59
Other long-term debt			58	[5]	58
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]
Debt Instrument [Line Items]
Par value	[6]		60
Other long-term debt			62	[6]	63
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Par value			30
Other long-term debt			30		30
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Par value			25
Other long-term debt			25		25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Par value			25
Other long-term debt			25		25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member]
Debt Instrument [Line Items]
Par value			38
Other long-term debt			$ 38		$ 34
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.375%		3.375%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.60%		2.60%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.75%		6.75%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.25%		1.25%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.50%		1.50%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.00%		3.00%
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.75%		1.69%
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.75%		1.69%
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.75%		1.69%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.82%		1.84%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.82%		1.84%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.82%		1.84%
Subsequent Event [Member] | Nevada Power Company [Member] | NV Energy [Member] | NPC Mortgage Securities, 3.70%, Series CC due May 2029 [Member]
Debt Instrument [Line Items]
Par value		$ 500
Debt Instrument, Interest Rate, Stated Percentage		3.70%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.1%, due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.10%		4.10%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.30%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.30%		4.30%
[1]	(1)The par values for these debt instruments are denominated in sterling.
[2]	(1)Amortizes quarterly or semiannually.
[3]	(2)The term loans have variable interest rates based on LIBOR plus a margin that varies during the terms of the agreements. The Company has entered into interest rate swaps that fix the interest rate on 75% of the Pinyon Pines outstanding debt and 100% of the TX Jumbo Road and Marshall Wind outstanding debt. The variable interest rate as of December 31, 2018 and 2017 was 4.55% and 3.32%, respectively, while the fixed interest rates as of December 31, 2018 and 2017 ranged from 3.21% to 3.63%.
[4]	(1)Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.
[5]	(2) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time.
[6]	(3) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time.

Subsidiary Debt Subsidiary De_5

Subsidiary Debt Subsidiary Debt - NPC - Capital and Financial Lease Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	$ 28,641
Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		2,847
Total Long-term Debt and Capital and Financial Lease Obligations		2,816	3,075
Long-term Debt and Capital and Financial Lease Obligations, Current		520	842
Long-term Debt and Capital and Financial Lease Obligations		2,296	2,233
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Other long-term debt			324
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Other long-term debt			499
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Other long-term debt			499
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Other long-term debt		358	357
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Other long-term debt		346	346
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Other long-term debt		247	247
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Other long-term debt		236	236
Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Other long-term debt		574	0
Nevada Power Company [Member] | Subsidiary Debt [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Other long-term debt			475
NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318	4,581
NV Energy [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318	4,581
NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		2,847
Other long-term debt		2,829	3,088
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Par value		0
Other long-term debt		0	324
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Par value		0
Other long-term debt		0	499
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Par value		500
Other long-term debt		500	499
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Par value		367
Other long-term debt		360	359
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Par value		349
Other long-term debt		348	348
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Par value		250
Other long-term debt		248	248
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Par value		250
Other long-term debt		244	244
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Par value		575
Other long-term debt		574	0
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Par value	[1]	40
Other long-term debt	[1]	40	40
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Par value	[1]	40
Other long-term debt	[1]	$ 39	$ 39
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.60%	1.60%
Par value	[1]	$ 13
Other long-term debt	[1]	13	$ 13
NV Energy [Member] | Nevada Power Company [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Par value		463
Other long-term debt		$ 463	$ 475
NV Energy [Member] | Nevada Power Company [Member] | Minimum [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.75%	2.75%
NV Energy [Member] | Nevada Power Company [Member] | Maximum [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		11.60%	11.60%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series O due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.50%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.500%, Series S due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.50%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.125%	7.125%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.65%	6.65%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%	6.75%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%	5.375%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.45%	5.45%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.75%	2.75%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.80%	1.80%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.60%	1.60%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.60%	1.60%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Minimum [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.75%	2.75%
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Maximum [Member] | Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		11.60%	11.60%
Land and Building [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		20 years
Capital Leased Assets, Gross		$ 6	$ 0
[1]	(1)Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.

Subsidiary Debt Subsidiary De_6

Subsidiary Debt Subsidiary Debt - NPC - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two		2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three		1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four		1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five		2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five		27,058
Par value		37,014
Long-term Debt		36,774	$ 35,193
Nevada Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Next Twelve Months		578
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Two		652
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Three		80
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Four		76
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Five		52
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal Thereafter		2,018
Par value		2,847
Total Long-term Debt Maturities and Capital and Financial Leases Future Minimum Payments		3,456
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost		31
Executory costs		74
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments		535
Long-term Debt		2,353	$ 2,600
Long-term Debt and Capital and Financial Lease Obligations, Including Current Maturities		2,816
Nevada Power Company [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		500
Long-term Debt, Maturities, Repayments of Principal in Year Two		575
Long-term Debt, Maturities, Repayments of Principal in Year Three		0
Long-term Debt, Maturities, Repayments of Principal in Year Four		0
Long-term Debt, Maturities, Repayments of Principal in Year Five		0
Long-term Debt, Maturities, Repayments of Principal after Year Five		1,309
Par value		2,384
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost		31
Executory costs		0
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments		0
Long-term Debt		2,353
Nevada Power Company [Member] | Capital and Financial Lease Obligations [Member]
Debt Instrument [Line Items]
Capital and Financial Leases, Future Minimum Payments Due, Next Twelve Months		78
Capital and Financial Leases, Future Minimum Payments Due in Two Years		77
Capital and Financial Leases, Future Minimum Payments Due in Three Years		80
Capital and Financial Leases, Future Minimum Payments Due in Four Years		76
Capital and Financial Leases, Future Minimum Payments Due in Five Years		52
Capital and Financial Leases, Future Minimum Payments Due Thereafter		709
Capital and Financial Leases, Future Minimum Payments Due		1,072
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost		0
Executory costs		74
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments		535
Capital and Financial Lease Obligations		463
NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 2,847
NV Energy [Member] | NPC General and Refunding Mortgage Notes, Series CC [Member] | Subsequent Event [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	$ 500
Debt Instrument, Interest Rate, Stated Percentage	3.70%

Subsidiary Debt Subsidiary De_7

Subsidiary Debt Subsidiary Debt - NPC - (Details) $ in Millions		12 Months Ended
		Dec. 31, 2018USD ($)option	Feb. 01, 2019USD ($)	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Par value		$ 37,014
Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		2,847
Eligible Property Subject To Lien Of Mortgages		$ 8,500
Nevada Power Company [Member] | Building [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		30 years
Renewal Options Under Capital Lease, Number | option		5
Number Of Years In Renewal Period		5 years
Number Of Renewal Options Exercised Under Capital Lease | option		3
Number Of Additional Renewal Options Under Capital Lease | option		2
Extended Additional Term Of Capital Lease		10 years
Capital Leased Assets, Gross		$ 23		$ 24
Nevada Power Company [Member] | Land and Building [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		20 years
Renewal Options Under Capital Lease, Number | option		3
Number Of Years In Renewal Period		10 years
Capital Leased Assets, Gross		$ 6		0
Nevada Power Company [Member] | Long-Term Energy Purchase Contracts [Member]
Debt Instrument [Line Items]
Number Of Years In Renewal Period		30 years
Capital Leased Assets, Gross		$ 30		34
Nevada Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Capital Leased Assets, Gross		$ 6		3
Nevada Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		41 years
Capital Leased Assets, Gross		$ 387		396
Utilities Aggregate Share Transmission Line Project		25.00%
Remaining Share Transmission Line Project		75.00%
Nevada Power Company [Member] | Nevada Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Utilities Aggregate Share Transmission Line Project		95.00%
Nevada Power Company [Member] | Sierra Pacific Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Utilities Aggregate Share Transmission Line Project		5.00%
NV Energy [Member]
Debt Instrument [Line Items]
Par value		$ 4,321
Other long-term debt		4,318		4,581
NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		2,847
Other long-term debt		$ 2,829		3,088
Minimum [Member] | Nevada Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		5 years
Maximum [Member] | Nevada Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		7 years
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		$ 28,263
Other long-term debt		28,097		28,641
Subsidiary Debt [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318		4,581
NPC Mortgage Securities, 3.70%, Series CC due May 2029 [Member] | Subsequent Event [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value			$ 500
Debt Instrument, Interest Rate, Stated Percentage			3.70%
Mortgage Securities, 6.500%, Series O due 2018 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		0
Other long-term debt		0		324
Mortgage Securities, 6.500%, Series O due 2018 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				$ 324
Mortgage Securities, 6.500%, Series O due 2018 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.50%
Mortgage Securities, 6.500%, Series S due 2018 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		0
Other long-term debt		0		$ 499
Mortgage Securities, 6.500%, Series S due 2018 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				$ 499
Mortgage Securities, 6.500%, Series S due 2018 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.50%
Mortgage Securities, 7.125%, Series V due 2019 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		500
Other long-term debt		$ 500		$ 499
Mortgage Securities, 7.125%, Series V due 2019 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				$ 499
Mortgage Securities, 7.125%, Series V due 2019 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.125%		7.125%
Mortgage Securities, 2.750%, Series BB due 2020 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 575
Other long-term debt		574		$ 0
Mortgage Securities, 2.750%, Series BB due 2020 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 574		$ 0
Mortgage Securities, 2.750%, Series BB due 2020 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.75%		2.75%
Mortgage Securities, 6.650%, Series N due 2036 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 367
Other long-term debt		360		$ 359
Mortgage Securities, 6.650%, Series N due 2036 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 358		$ 357
Mortgage Securities, 6.650%, Series N due 2036 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.65%		6.65%
Mortgage Securities, 6.750%, Series R due 2037 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 349
Other long-term debt		348		$ 348
Mortgage Securities, 6.750%, Series R due 2037 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 346		$ 346
Mortgage Securities, 6.750%, Series R due 2037 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Mortgage Securities, 5.375%, Series X due 2040 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 250
Other long-term debt		248		$ 248
Mortgage Securities, 5.375%, Series X due 2040 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 247		$ 247
Mortgage Securities, 5.375%, Series X due 2040 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%		5.375%
Mortgage Securities, 5.450%, Series Y due 2041 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 250
Other long-term debt		244		$ 244
Mortgage Securities, 5.450%, Series Y due 2041 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 236		$ 236
Mortgage Securities, 5.450%, Series Y due 2041 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.45%		5.45%
NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 40
Other long-term debt	[1]	$ 40		$ 40
NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.80%		1.80%
NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 40
Other long-term debt	[1]	$ 39		$ 39
NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.60%		1.60%
NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 13
Other long-term debt	[1]	$ 13		$ 13
Debt Instrument, Interest Rate, Stated Percentage		1.60%		1.60%
NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member] | Subsidiary Debt [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.60%		1.60%
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value		$ 463
Other long-term debt		$ 463		$ 475
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | Minimum [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.75%		2.75%
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | Maximum [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		11.60%		11.60%
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | Subsidiary Debt [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				$ 475
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | Subsidiary Debt [Member] | Minimum [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.75%		2.75%
Capital lease obligations, 2.75% to 11.60%, due through 2054 [Member] | Subsidiary Debt [Member] | Maximum [Member] | NV Energy [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		11.60%		11.60%
[1]	(1)Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.

Subsidiary Debt Subsidiary De_8

Subsidiary Debt Subsidiary Debt - SPPC - Capital and Financial Lease Obligations (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097		$ 28,641
NV Energy [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318		4,581
NV Energy [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		4,321
Other long-term debt		4,318		4,581
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value		1,159
Total Long-term Debt and Capital and Financial Lease Obligations		1,158		1,154
Long-term Debt and Capital and Financial Lease Obligations, Current		3		2
Long-term Debt and Capital and Financial Lease Obligations		1,155		1,152
Long-term Debt and Capital and Financial Lease Obligations, Including Current Maturities		$ 1,158		$ 1,154
Sierra Pacific Power Company [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%
Sierra Pacific Power Company [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 249		$ 248
Sierra Pacific Power Company [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 396		$ 396
Sierra Pacific Power Company [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Sierra Pacific Power Company [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 255		$ 255
Sierra Pacific Power Company [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt	[1]			20
Sierra Pacific Power Company [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt	[1]			58
Sierra Pacific Power Company [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt	[2]			63
Sierra Pacific Power Company [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt				30
Sierra Pacific Power Company [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt				25
Sierra Pacific Power Company [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt				25
Sierra Pacific Power Company [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt				34
Sierra Pacific Power Company [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Par value		1,159
Other long-term debt		1,159		1,156
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]
Debt Instrument [Line Items]
Par value		250
Other long-term debt		$ 249		$ 249
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Par value		$ 400
Other long-term debt		$ 396		$ 396
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.60%		2.60%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]
Debt Instrument [Line Items]
Par value		$ 252
Other long-term debt		$ 256		$ 256
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 20
Other long-term debt		$ 20	[1]	$ 20
Sierra Pacific Power Company [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.25%		1.25%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 59
Other long-term debt		$ 58	[1]	$ 58
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.50%		1.50%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]
Debt Instrument [Line Items]
Par value	[2]	$ 60
Other long-term debt		$ 62	[2]	$ 63
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.00%		3.00%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Par value		$ 30
Other long-term debt		30		$ 30
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Par value		25
Other long-term debt		25		25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Par value		25
Other long-term debt		25		25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member]
Debt Instrument [Line Items]
Par value		38
Other long-term debt		$ 38		$ 34
[1]	(2) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time.
[2]	(3) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time.

Subsidiary Debt Subsidiary De_9

Subsidiary Debt Subsidiary Debt - SPPC - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two	2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five	2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,058
Par value	37,014
Long-term Debt	36,774	$ 35,193
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Next Twelve Months	6
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Two	4
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Three	5
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Four	4
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal in Year Five	254
Long-term Debt and Capital and Financial Lease Obligations, Repayments of Principal Thereafter	918
Par value	1,159
Total Long-term Debt Maturities and Capital and Financial Leases Future Minimum Payments	1,191
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(1)
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments	(32)
Long-term Debt	1,120	1,120
Long-term Debt and Capital and Financial Lease Obligations, Including Current Maturities	1,158	$ 1,154
Eligible Property Subject To Lien Of Mortgages	4,100
Sierra Pacific Power Company [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	250
Long-term Debt, Maturities, Repayments of Principal after Year Five	871
Par value	1,121
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(1)
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments	0
Long-term Debt	1,120
Sierra Pacific Power Company [Member] | Capital and Financial Lease Obligations [Member]
Debt Instrument [Line Items]
Capital and Financial Leases, Future Minimum Payments Due, Next Twelve Months	6
Capital and Financial Leases, Future Minimum Payments Due in Two Years	4
Capital and Financial Leases, Future Minimum Payments Due in Three Years	5
Capital and Financial Leases, Future Minimum Payments Due in Four Years	4
Capital and Financial Leases, Future Minimum Payments Due in Five Years	4
Capital and Financial Leases, Future Minimum Payments Due Thereafter	47
Capital and Financial Leases, Future Minimum Payments Due	70
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	0
Capital and Financial Leases, Future Minimum Payments, Interest Included in Payments	(32)
Capital and Financial Lease Obligations	$ 38

Subsidiary Debt Subsidiary D_10

Subsidiary Debt Subsidiary Debt - SPPC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value		1,159
Eligible Property Subject To Lien Of Mortgages		4,100
Sierra Pacific Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Capital Leased Assets, Gross		$ 8		$ 3
Sierra Pacific Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		41 years
Capital Leased Assets, Gross		$ 20		21
Utilities Aggregate Share Transmission Line Project		25.00%
Remaining Share Transmission Line Project		75.00%
Sierra Pacific Power Company [Member] | Solar Generating Facility [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		20 years
Capital Leased Assets, Gross		$ 9		$ 9
Sierra Pacific Power Company [Member] | Sierra Pacific Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Utilities Aggregate Share Transmission Line Project		5.00%
Sierra Pacific Power Company [Member] | Nevada Power Company [Member] | ON Line Transmission Line [Member]
Debt Instrument [Line Items]
Utilities Aggregate Share Transmission Line Project		95.00%
Minimum [Member] | Sierra Pacific Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		5 years
Maximum [Member] | Sierra Pacific Power Company [Member] | Equipment [Member]
Debt Instrument [Line Items]
Terms Of Capital Lease		7 years
Mortgage securities, 3.375%, Series T due 2023 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%
Mortgage securities, 6.750%, Series P due 2037 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Capital and financial lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.70%		2.70%
Capital and financial lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		10.297%		10.396%
NV Energy [Member]
Debt Instrument [Line Items]
Other long-term debt		$ 4,318		$ 4,581
Par value		4,321
NV Energy [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		1,159		1,156
Par value		1,159
NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		249		249
Par value		250
NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		396		396
Par value		400
NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		256		256
Par value		252
NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		20	[1]	20
Par value	[1]	20
NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		58	[1]	58
Par value	[1]	59
NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		62	[2]	63
Par value	[2]	60
NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		30		30
Par value		30
NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		25		25
Par value		25
NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		25		25
Par value		25
NV Energy [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		38		34
Par value		38
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Other long-term debt		28,097		28,641
Par value		28,263
Subsidiary Debt [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		249		248
Subsidiary Debt [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		396		396
Subsidiary Debt [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt		255		255
Subsidiary Debt [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt	[1]			20
Subsidiary Debt [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt	[1]			58
Subsidiary Debt [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt	[2]			63
Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				30
Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				25
Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				25
Subsidiary Debt [Member] | Capital lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Other long-term debt				34
Subsidiary Debt [Member] | NV Energy [Member]
Debt Instrument [Line Items]
Other long-term debt		4,318		$ 4,581
Par value		$ 4,321
Subsidiary Debt [Member] | NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%
Subsidiary Debt [Member] | NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.60%		2.60%
Subsidiary Debt [Member] | NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Subsidiary Debt [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.25%		1.25%
Subsidiary Debt [Member] | NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.50%		1.50%
Subsidiary Debt [Member] | NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.00%		3.00%
Subsidiary Debt [Member] | NV Energy [Member] | Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2031 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.75%		1.69%
Subsidiary Debt [Member] | NV Energy [Member] | Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2031 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.82%		1.84%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.75%		1.69%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.82%		1.84%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.75%		1.69%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.82%		1.84%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.75%		1.69%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.82%		1.84%
Subsidiary Debt [Member] | NV Energy [Member] | Capital and financial lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Minimum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.70%		2.70%
Subsidiary Debt [Member] | NV Energy [Member] | Capital and financial lease obligations, 2.700% to 10.297%, due through 2054 [Member] | Maximum [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		10.297%		10.369%
[1]	(2) Subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate may be adjusted from time to time.
[2]	(3) Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time.

Subsidiary Debt - Northern Powe

Subsidiary Debt - Northern Powergrid (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	$ 28,641
PacifiCorp [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		7,076
Other long-term debt		$ 7,036	$ 7,025
PacifiCorp [Member] | Subsidiary Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.67%	1.60%
PacifiCorp [Member] | Subsidiary Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.85%	1.87%
PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.125%
Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 2,621
Other long-term debt		2,626	$ 2,805
Northern Powergrid Holdings [Member] | Bonds, 8.875%, due 2020 [Member]
Debt Instrument [Line Items]
Par value	[1]	128
Other long-term debt		133	144
Northern Powergrid Holdings [Member] | Bonds, 9.25%, due 2020 [Member]
Debt Instrument [Line Items]
Par value	[1]	255
Other long-term debt		260	279
Northern Powergrid Holdings [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member]
Debt Instrument [Line Items]
Par value	[1]	294
Other long-term debt		293	366
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2022 [Member]
Debt Instrument [Line Items]
Par value	[1]	255
Other long-term debt		262	279
Northern Powergrid Holdings [Member] | Bonds, 2.50%, due 2025 [Member]
Debt Instrument [Line Items]
Par value	[1]	191
Other long-term debt		189	200
Northern Powergrid Holdings [Member] | European Investment Bank loan, 2.073%, due 2025 [Member]
Debt Instrument [Line Items]
Par value	[1]	64
Other long-term debt		65	69
Northern Powergrid Holdings [Member] | European Investment Bank loans, 2.564%, due 2017 [Member]
Debt Instrument [Line Items]
Par value	[1]	319
Other long-term debt		318	336
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2028 [Member]
Debt Instrument [Line Items]
Par value	[1]	237
Other long-term debt		241	256
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]
Debt Instrument [Line Items]
Par value	[1]	255
Other long-term debt		252	267
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]
Debt Instrument [Line Items]
Par value	[1]	191
Other long-term debt		189	200
Northern Powergrid Holdings [Member] | Bonds, 4.375%, due 2032 [Member]
Debt Instrument [Line Items]
Par value	[1]	191
Other long-term debt		188	199
Northern Powergrid Holdings [Member] | Variable-rate bond, due 2026 [Member]
Debt Instrument [Line Items]
Par value	[1],[2]	241
Other long-term debt	[2]	236	210
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		2,621
Other long-term debt		$ 2,626	$ 2,805
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 8.875%, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.875%	8.875%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 9.25%, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		9.25%	9.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.901%	3.901%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.586%	4.586%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 7.25%, due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.25%	7.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 2.50%, due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.50%	2.50%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loan, 2.073%, due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.073%	2.073%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 2.564%, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.564%	2.564%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 7.25%, due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.25%	7.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 5.125%, due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.125%	5.125%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 5.125%, due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.125%	5.125%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 4.375%, due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.375%	4.375%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Variable-rate bond, due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.66%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		2.82%
[1]	(1)The par values for these debt instruments are denominated in sterling.
[2]	(2)Amortizes semiannually and the Company has entered into an interest rate swap that fixes the interest rate on 85% of the outstanding debt. The variable interest rate as of December 31, 2018 was 2.66% while the fixed interest rate was 2.82%.

Subsidiary Debt - BHE Pipeline

Subsidiary Debt - BHE Pipeline Group (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value	$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	28,263
Other long-term debt	28,097	$ 28,641
BHE Pipeline Group [Member]
Debt Instrument [Line Items]
Par value	1,050
Other long-term debt	1,042	796
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Senior Notes, 5.75%, due 2018 [Member]
Debt Instrument [Line Items]
Par value	0
Other long-term debt	0	200
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Senior Notes, 4.25%, due 2021 [Member]
Debt Instrument [Line Items]
Par value	200
Other long-term debt	199	199
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Senior Bonds, 5.8%, due 2037 [Member]
Debt Instrument [Line Items]
Par value	150
Other long-term debt	149	149
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Senior Bonds, 4.1%, due 2042 [Member]
Debt Instrument [Line Items]
Par value	250
Other long-term debt	248	248
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Senior Bonds, 4.30%, due 2049 [Member]
Debt Instrument [Line Items]
Par value	450
Other long-term debt	$ 446	$ 0
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Notes, 5.75%, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.75%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Notes, 4.25%, due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 5.8%, due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.80%	5.80%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.1%, due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.10%	4.10%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.30%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.30%	4.30%

Subsidiary Debt Subsidiary D_11

Subsidiary Debt Subsidiary Debt - AltaLink (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	$ 28,641
ALP Investments [Member]
Debt Instrument [Line Items]
Par value	[1]	441
Other long-term debt		442	481
ALP Investments [Member] | Series 12-1 Senior Bonds, 3.674%, due 2019 [Member]
Debt Instrument [Line Items]
Par value	[1]	147
Other long-term debt		148	162
ALP Investments [Member] | Series 13-1 Senior Bonds, 3.265%, due 2020 [Member]
Debt Instrument [Line Items]
Par value	[1]	147
Other long-term debt		148	161
ALP Investments [Member] | Series 15-1 Senior Bonds, 2.244%, due 2022 [Member]
Debt Instrument [Line Items]
Par value	[1]	147
Other long-term debt		$ 146	$ 158
ALP Investments [Member] | Subsidiary Debt [Member] | Series 12-1 Senior Bonds, 3.674%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.674%	3.674%
ALP Investments [Member] | Subsidiary Debt [Member] | Series 13-1 Senior Bonds, 3.265%, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.265%	3.265%
ALP Investments [Member] | Subsidiary Debt [Member] | Series 15-1 Senior Bonds, 2.244%, due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.244%	2.244%
AltaLink, L.P. [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 3,407
Other long-term debt		3,392	$ 3,840
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2008-1 Notes, 5.243%, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.243%
Par value	[1]	0
Other long-term debt		$ 0	$ 159
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-2 Notes, 3.621%, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.621%	3.621%
Par value	[1]	$ 92
Other long-term debt		$ 92	$ 99
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-2 Notes, 2.978%, due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.978%	2.978%
Par value	[1]	$ 202
Other long-term debt		$ 201	$ 218
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-4 Notes, 3.668%, due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.668%	3.668%
Par value	[1]	$ 366
Other long-term debt		$ 366	$ 397
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-1 Notes, 3.399%, due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.399%	3.399%
Par value	[1]	$ 256
Other long-term debt		$ 256	$ 278
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2016-1 Notes, 2.747%, due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.747%	2.747%
Par value	[1]	$ 256
Other long-term debt		$ 255	$ 277
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2006-1 Notes, 5.249%, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.249%	5.249%
Par value	[1]	$ 110
Other long-term debt		$ 109	$ 119
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-1 Notes, 5.381%, due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.381%	5.381%
Par value	[1]	$ 92
Other long-term debt		$ 91	$ 99
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-2 Notes, 4.872%, due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.872%	4.872%
Par value	[1]	$ 110
Other long-term debt		$ 109	$ 119
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2011-1 Notes, 4.462%, due 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.462%	4.462%
Par value	[1]	$ 202
Other long-term debt		$ 201	$ 218
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-1 Notes, 3.99%, due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.99%	3.99%
Par value	[1]	$ 385
Other long-term debt		$ 380	$ 412
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-3 Notes, 4.922%, due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.922%	4.922%
Par value	[1]	$ 256
Other long-term debt		$ 256	$ 278
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-3 Notes, 4.054%, due 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.054%	4.054%
Par value	[1]	$ 216
Other long-term debt		$ 215	$ 233
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2015-1 Notes, 4.090%, due 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.09%	4.09%
Par value	[1]	$ 256
Other long-term debt		$ 255	$ 277
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2016-2 Notes, 3.717%, due 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.717%	3.717%
Par value	[1]	$ 330
Other long-term debt		$ 328	$ 356
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-1 Notes, 4.446%, due 2053 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.446%	4.446%
Par value	[1]	$ 183
Other long-term debt		$ 183	$ 198
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-2 Notes, 4.274%, due 2064 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.274%	4.274%
Par value	[1]	$ 95
Other long-term debt		$ 95	$ 103
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Construction Loan, 4.950%, due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.66%	5.66%
Par value	[1]	$ 8
Other long-term debt		8	$ 13
BHE Transmission [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	[1]	3,856
Other long-term debt		$ 3,842	$ 4,334
[1]	ns): Par Value(1) 2018 2017AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019$147 $148 $162Series 13-1 Senior Bonds, 3.265%, due 2020147 148 161Series 15-1 Senior Bonds, 2.244%, due 2022147 146 158Total AltaLink Investments, L.P.441 442 481 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018— — 159Series 2013-2 Notes, 3.621%, due 202092 92 99Series 2012-2 Notes, 2.978%, due 2022202 201 218Series 2013-4 Notes, 3.668%, due 2023366 366 397Series 2014-1 Notes, 3.399%, due 2024256 256 278Series 2016-1 Notes, 2.747%, due 2026256 255 277Series 2006-1 Notes, 5.249%, due 2036110 109 119Series 2010-1 Notes, 5.381%, due 204092 91 99Series 2010-2 Notes, 4.872%, due 2040110 109 119Series 2011-1 Notes, 4.462%, due 2041202 201 218Series 2012-1 Notes, 3.990%, due 2042385 380 412Series 2013-3 Notes, 4.922%, due 2043256 256 278Series 2014-3 Notes, 4.054%, due 2044216 215 233Series 2015-1 Notes, 4.090%, due 2045256 255 277Series 2016-2 Notes, 3.717%, due 2046330 328 356Series 2013-1 Notes, 4.446%, due 2053183 183 198Series 2014-2 Notes, 4.274%, due 206495 95 103Total AltaLink, L.P.3,407 3,392 3,840 Other: Construction Loan, 5.660%, due 20208 8 13 Total BHE Transmission$3,856 $3,842 $4,334(1)The par values for these debt instruments are denominated in Canadian dollars.

Subsidiary Debt - BHE Renewable

Subsidiary Debt - BHE Renewables (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
Other long-term debt		28,097	$ 28,641
BHE Renewables [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		3,438
Other long-term debt		$ 3,401	3,594
BHE Renewables [Member] | Subsidiary Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.21%
BHE Renewables [Member] | Subsidiary Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.63%
BHE Renewables [Member] | Subsidiary Debt [Member] | Bishop Hill Holdings Senior Notes, 5.125%, due 2032 [Member]
Debt Instrument [Line Items]
Par value	[1]	$ 85
Other long-term debt	[1]	84	93
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 3.950%, due June 2035 [Member]
Debt Instrument [Line Items]
Par value	[1]	295
Other long-term debt	[1]	292	310
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 5.375%, due June 2035 [Member]
Debt Instrument [Line Items]
Par value	[1]	924
Other long-term debt	[1]	915	965
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]
Debt Instrument [Line Items]
Par value	[1]	396
Other long-term debt		392	404
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 5.75%, due 2039 [Member]
Debt Instrument [Line Items]
Par value	[1]	718
Other long-term debt	[1]	709	745
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due 2039
Debt Instrument [Line Items]
Par value	[1]	207
Other long-term debt	[1]	205	217
BHE Renewables [Member] | Subsidiary Debt [Member] | Alamo 6 Senior Notes, 4.170%, due 2042 [Member]
Debt Instrument [Line Items]
Par value	[1]	224
Other long-term debt	[1]	221	229
BHE Renewables [Member] | Subsidiary Debt [Member] | Other debt obligations [Member]
Debt Instrument [Line Items]
Par value	[1]	16
Other long-term debt	[1]	16	19
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loans, due 2019 [Member]
Debt Instrument [Line Items]
Par value	[1],[2]	310
Other long-term debt	[1],[2]	$ 310	$ 333
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		4.55%	3.32%
BHE Renewables [Member] | Subsidiary Debt [Member] | TX Jumbo Road Term Loan, 3.626% due 2025 [Member]
Debt Instrument [Line Items]
Par value	[1],[2]	$ 180
Other long-term debt	[1],[2]	176	$ 193
BHE Renewables [Member] | Subsidiary Debt [Member] | Marshall Wind term loan, variable interest rate, due 2026 [Member]
Debt Instrument [Line Items]
Par value	[1],[2]	83
Other long-term debt	[1],[2]	$ 81	$ 86
BHE Renewables [Member] | Subsidiary Debt [Member] | Bishop Hill Holdings Senior Notes, 5.125%, due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.125%	5.125%
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 3.950%, due June 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.95%	3.95%
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 5.375%, due June 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%	5.375%
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.86%	3.86%
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 5.75%, due 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.75%	5.75%
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due 2039
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.875%	4.875%
BHE Renewables [Member] | Subsidiary Debt [Member] | Alamo 6, LLC Senior Secured Notes, 4.17%, due March 2018 through March 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.17%	4.17%
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loans, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.55%	3.32%
BHE Renewables [Member] | Subsidiary Debt [Member] | TX Jumbo Road Term Loan, 3.626% due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.626%	3.626%
BHE Renewables [Member] | Subsidiary Debt [Member] | Marshall Wind term loan, variable interest rate, due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.212%	3.212%
[1]	(1)Amortizes quarterly or semiannually.
[2]	(2)The term loans have variable interest rates based on LIBOR plus a margin that varies during the terms of the agreements. The Company has entered into interest rate swaps that fix the interest rate on 75% of the Pinyon Pines outstanding debt and 100% of the TX Jumbo Road and Marshall Wind outstanding debt. The variable interest rate as of December 31, 2018 and 2017 was 4.55% and 3.32%, respectively, while the fixed interest rates as of December 31, 2018 and 2017 ranged from 3.21% to 3.63%.

Subsidiary Debt Subsidiary D_12

Subsidiary Debt Subsidiary Debt - HomeServices (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value		$ 37,014
Long-term Debt		36,774	$ 35,193
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		28,263
HomeServices [Member] | Variable-rate Term Loan - Due 2022 [Member]
Debt Instrument [Line Items]
Par value	[1]	233
HomeServices [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value		$ 233
HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.022%	2.819%
HomeServices [Member] | HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	[1]	$ 233	$ 247
[1]	(1)Amortizes quarterly.

Risk Management and Hedging A_3

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity Contract [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ (97)	$ (104)
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	59	74
Derivative Assets (Liabilities), at Fair Value, Net	(38)	(30)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	27	8
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	(2)	0
Derivative Assets (Liabilities), at Fair Value, Net	25	8
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	3	1
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	0	0
Derivative Assets (Liabilities), at Fair Value, Net	3	1
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(57)	(31)
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	16	17
Derivative Assets (Liabilities), at Fair Value, Net	(41)	(14)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(70)	(82)
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	45	57
Derivative Assets (Liabilities), at Fair Value, Net	(25)	(25)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	51	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(148)	(117)
Derivative, Fair Value, Net	(97)	(104)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	96	101	$ 73	$ 133
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	36	11
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(9)	(3)
Derivative, Fair Value, Net	27	8
Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	4	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)	0
Derivative, Fair Value, Net	3	1
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	10	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(67)	(32)
Derivative, Fair Value, Net	(57)	(31)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(71)	(82)
Derivative, Fair Value, Net	$ (70)	$ (82)

Risk Management and Hedging A_4

Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - PacifiCorp [Member] - Not Designated as Hedging Instrument [Member] - Commodity Contract [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 101	$ 73	$ 133
Changes In Fair Value Derivatives Recognized In Regulatory Assets Or Liabilities, Net	12	47	(27)
Net Gains (Losses) Reclassified To Operating Revenue	(68)	9	10
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	51	(28)	(43)
Ending balance	$ 96	$ 101	$ 73

Risk Management and Hedging A_5

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - PacifiCorp [Member] - Commodity Contract [Member] gal in Millions, MWh in Millions, Dth in Millions	Dec. 31, 2018galDthMWh	Dec. 31, 2017galDthMWh
Electricity purchases (sales), net, in megawatt hours [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount | MWh	(6)	(9)
Natural gas purchases, in decatherms [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount | Dth	(117)	(113)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount | gal	0	0

Risk Management and Hedging A_6

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - PacifiCorp [Member] - Commodity Contract [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 113	$ 110
Collateral Already Posted, Aggregate Fair Value	61	74
Additional Collateral, Aggregate Fair Value	$ 35	$ 34

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		$ (52)	[1]	$ 29
Assets, Fair Value Disclosure		3,114		3,945
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Derivative Liability		(111)		(83)
Cash collateral receivable (payable), offset against derivative positions	[1]	59		76
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,423		3,296
Derivative Liability		(1)		(3)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		625		565
Derivative Liability		(212)		(175)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		118		113
Derivative Liability		(9)		(10)
Mortgage loans held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		468		465
Mortgage loans held for sale [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage loans held for sale [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		468		465
Mortgage loans held for sale [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	409		685
Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	409		685
Money market mutual funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0		0
Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0		0
United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
United States government obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
United States government obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
United States government obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
International governement obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
International governement obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
International governement obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
International governement obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Corporate obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Corporate obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Corporate obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
United States companies [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
United States companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
United States companies [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1,441		1,968
International companies [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1,441		1,968
International companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
International companies [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Investment funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Investment funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(52)		(29)
Derivative assets		148		118
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Derivative Liability		(79)		(75)
Commodity Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1		3
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		91		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		180		167
Commodity Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		108		104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		9		10
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		24		24
Derivative Liability		(32)		(8)
Interest Rate Swap [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		13		15
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		32		8
Interest Rate Swap [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		10		9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 0		$ 0
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017, respectively.
[2]	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements - Level

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commodity [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 94	$ 60	$ 47
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(1)	(23)	(8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	(2)	3	2
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	(3)	1	11
Purchases	3	1	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	0	0
Settlements	4	(14)	(17)
Ending balance	99	94	60
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	9	6	4
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(181)	(147)	(121)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0
Purchases	0	4	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	0	0
Settlements	180	148	119
Ending balance	10	9	6
Auction Rate Securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0	44
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	0	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	(8)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0
Purchases	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	0	57
Settlements	0	0	0
Ending balance	$ 0	$ 0	$ 0

Fair Value Measurements - Debt

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 39,398	$ 40,522

Fair Value Measurements - Pacif

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		$ (52)	[1]	$ 29
Assets, Fair Value Disclosure		3,114		3,945
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Derivative Liability		(111)		(83)
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	[1]	59		76
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,423		3,296
Derivative Liability		(1)		(3)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		625		565
Derivative Liability		(212)		(175)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		118		113
Derivative Liability		(9)		(10)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(52)		(29)
Derivative assets		148		118
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Derivative Liability		(79)		(75)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1		3
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		91		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		180		167
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		108		104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		9		10
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	409		685
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	409		685
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0		0
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0		0
Investment funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
PacifiCorp [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		121		51
PacifiCorp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		93		42
PacifiCorp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		51		13
PacifiCorp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0		0
PacifiCorp [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions		59		74
PacifiCorp [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[3]	(23)		(4)
Derivative assets		28		9
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[3]	82		78
Derivative Liability		(66)		(39)
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions		59		74
PacifiCorp [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
PacifiCorp [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		51		13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		148		117
PacifiCorp [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
PacifiCorp [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[4]	69		21
PacifiCorp [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[4]	69		21
PacifiCorp [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[4]	0		0
PacifiCorp [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[4]	0		0
PacifiCorp [Member] | Investment funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment funds		24		21	[4]
PacifiCorp [Member] | Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment funds		24		21	[4]
PacifiCorp [Member] | Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment funds		0		0	[4]
PacifiCorp [Member] | Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment funds		$ 0		$ 0	[4]
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017, respectively.
[2]	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[3]	Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $74 million as of December 31, 2018 and 2017, respectively.
[4]	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements - Pac_2

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	39,398	40,522
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	7,015	7,005
PacifiCorp [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 7,833	$ 8,370

Fair Value Measurements - MEC (

Fair Value Measurements - MEC (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 3,114		$ 3,945
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(52)	[1]	29
Derivative Liability		111		83
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	[1]	59		76
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,423		3,296
Derivative Liability		1		3
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		625		565
Derivative Liability		212		175
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		118		113
Derivative Liability		9		10
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(52)		(29)
Derivative Liability		79		75
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	111		105
Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(1)		(3)
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		91		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(180)		(167)
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		108		104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(9)		(10)
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability		32		8
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		13		15
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(32)		(8)
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		10		9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		517		667
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(3)		(2)
Derivative Liability		(22)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	3
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions		0		0
MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		461		619
Derivative Liability		0
MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		57		46
Derivative Liability		(23)
MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2		4
Derivative Liability		(2)
MidAmerican Energy Company [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		3		5
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		3		(2)	[2]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(3)		(8)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	3		2
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		4		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(4)		(9)
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		2		4
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(2)		(1)
MidAmerican Energy Company [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(19)
MidAmerican Energy Company [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0
MidAmerican Energy Company [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(19)
MidAmerican Energy Company [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[3]	409		685
Money market mutual funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[3]	409		685
Money market mutual funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[3]	0		0
Money market mutual funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[3]	0		0
Money market mutual funds [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		133	[4]
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		133	[4]
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0	[4]
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0	[4]
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
US Treasury Securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
US Treasury Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		187		176
US Treasury Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
US Treasury Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Government, Non-US [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Government, Non-US [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
Debt Security, Government, Non-US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Government, Non-US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		4		5
Debt Security, Government, Non-US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Corporate, US [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Debt Security, Corporate, US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Corporate, US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Debt Security, Corporate, US [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Corporate, US [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Debt Security, Corporate, US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Debt Security, Corporate, US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		46		36
Debt Security, Corporate, US [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Municipal Bonds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2		2
Municipal Bonds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
US Government-sponsored Enterprises Debt Securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1
US Government-sponsored Enterprises Debt Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0
US Government-sponsored Enterprises Debt Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1
US Government-sponsored Enterprises Debt Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0
Domestic Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Domestic Equity Securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
Domestic Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		256		288
Domestic Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Domestic Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Foreign Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1,441		1,968
Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1,441		1,968
Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Foreign Equity Securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		6		7
Foreign Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		6		7
Foreign Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Foreign Equity Securities [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128		178
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Equity Funds [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		10		15
Equity Funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		10		15
Equity Funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Equity Funds [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 0		$ 0
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $59 million and $76 million as of December 31, 2018 and 2017, respectively.
[2]	(1)Represents netting under master netting arrangements and a net cash collateral receivable of $- million as of December 31, 2018 and 2017.
[3]	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[4]	(2)Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements - MEC -

Fair Value Measurements - MEC - Level 3 (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Auction Rate Securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		$ 0	$ 0	$ 44
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		0	0	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	(8)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net		0	0	0
Purchases		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0	0	(57)
Settlements		0	0	0
Ending balance		0	0	0
MidAmerican Energy Company [Member] | Derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		3	(2)	(6)
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Transferred To Affiliate		0	0	(4)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	[1]	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net		(3)	2	(6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0	0	0
Settlements		0	3	14
Ending balance		0	3	(2)
MidAmerican Energy Company [Member] | Auction Rate Securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		0	0	26
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Transferred To Affiliate		0	0	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		0	0	5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	4
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0	0	35
Settlements		0	0	0
Ending balance		$ 0	$ 0	$ 0
[1]	(1)On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE.

Fair Value Measurements - MEC_2

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	39,398	40,522
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	5,381	5,042
Long-term Debt, Fair Value		$ 5,686
MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 5,646

Fair Value Measurements - MidAm

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	39,398	40,522
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	5,621	5,282
Long-term Debt, Fair Value		$ 6,006
MidAmerican Funding, LLC and Subsidiaries [Domain] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 5,943

Fair Value Measurements - NPC (

Fair Value Measurements - NPC (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 3,114	$ 3,945
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,423	3,296
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		625	565
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		118	113
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		148	118
Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(1)	(3)
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		91	42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(180)	(167)
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		108	104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(9)	(10)
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	409	685
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	409	685
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128	178
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128	178
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		112
Nevada Power Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		105
Nevada Power Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Nevada Power Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		7
Nevada Power Company [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(4)	(3)
Nevada Power Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Nevada Power Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Nevada Power Company [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(4)	(3)
Nevada Power Company [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	104
Nevada Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	104
Nevada Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0
Nevada Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0
Nevada Power Company [Member] | Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1	2
Nevada Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		1	2
Nevada Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Nevada Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 0	$ 0
[1]	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements - NPC -

Fair Value Measurements - NPC - Level 3 (Details) - Commodity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	$ 99	$ 94	$ 60	$ 47
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	(3)	1	11
Settlements	4	(14)	(17)
Ending balance	99	94	60
Nevada Power Company [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	3	(3)	(14)	$ (22)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	4	(3)	(4)
Settlements	2	14	12
Ending balance	$ 3	$ (3)	$ (14)

Fair Value Measurements - NPC_2

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	39,398	40,522
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	2,353	2,600
Nevada Power Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 2,651	$ 3,088

Fair Value Measurements - SPPC

Fair Value Measurements - SPPC (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 3,114	$ 3,945
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,423	3,296
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		625	565
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		118	113
Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128	178
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		128	178
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	409	685
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	409	685
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		47
Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		45
Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2
Sierra Pacific Power Company [Member] | Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Sierra Pacific Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Sierra Pacific Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Sierra Pacific Power Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Sierra Pacific Power Company [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	45
Sierra Pacific Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	45
Sierra Pacific Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0
Sierra Pacific Power Company [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[2]	0
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		148	118
Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1	1
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		91	42
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		108	$ 104
Commodity Contract [Member] | Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		2
Commodity Contract [Member] | Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0
Commodity Contract [Member] | Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0
Commodity Contract [Member] | Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		$ 2
[1]	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Amounts are included in cash and cash equivalents on the Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 36,774	$ 35,193
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	39,398	40,522
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	1,120	1,120
Sierra Pacific Power Company [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 1,167	$ 1,221

Other, Net - MEC (Details)

Other, Net - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ (9)	$ (420)	$ 30
MidAmerican Energy Company [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	30	37	29
MidAmerican Energy Company [Member] | Defined Benefit Retirement Plans, Non-service Cost Components [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	21	18	15
MidAmerican Energy Company [Member] | Corporate Owned Life Insurance Income (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	6	13	8
MidAmerican Energy Company [Member] | Available-For-Sale Securities, Gross Gain (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	0	0	5
MidAmerican Energy Company [Member] | Other Income (Expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 3	$ 6	$ 1

Other, Net - MidAmerican Fundin

Other, Net - MidAmerican Funding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ (9)	$ (420)	$ 30
MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	31	9	34
MidAmerican Funding, LLC and Subsidiaries [Domain] | Defined Benefit Retirement Plans, Non-service Cost Components [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	21	18	15
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate Owned Life Insurance Income (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	6	13	8
MidAmerican Funding, LLC and Subsidiaries [Domain] | Available-For-Sale Securities, Gross Gain (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	0	0	5
MidAmerican Funding, LLC and Subsidiaries [Domain] | Gains (Losses) on Disposition of Assets [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	1	1	3
MidAmerican Funding, LLC and Subsidiaries [Domain] | Gain (Loss) on Extinguishment of Debt [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	0	(29)	0
MidAmerican Funding, LLC and Subsidiaries [Domain] | Other Income (Expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 3	$ 6	$ 3

Income Taxes Income Taxes - Tax

Income Taxes Income Taxes - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Current Income Tax Expense (Benefit)				$ (591)	$ (573)	$ (687)
Federal statutory income tax rate				21.00%	35.00%	35.00%
Deferred Tax Liabilities, Net				$ 9,047	$ 8,242
Regulatory Liabilities				7,506	7,511
Deferred Income Tax Expense (Benefit)				14	26	$ 1,098
Net income (loss) attributable to parent				2,568	2,870	2,542
Income tax (benefit) expense				(583)	(554)	403
Equity income (loss)				43	(151)	123
Reclassification of long-term income tax receivable				(609)
Long-term income tax receivable adjustments				17
Related Party Transaction, Cash Received for Income Taxes, Net				900	600	$ 1,053
Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[1]			3,923	$ 4,143
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Current Income Tax Expense (Benefit)				$ 68
Federal statutory income tax rate				21.00%
Deferred Tax Liabilities, Net	[2]			$ 7,115
Deferred Income Tax Expense (Benefit)				68
Increase (decrease) in provisional tax liabilities				134
Increase (Decrease) in Deferred Income Taxes				(27)
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]			5,950
Deferred Income Tax Expense (Benefit)	[2]	$ 1,150
Net income (loss) attributable to parent	[2]			516
Income tax (benefit) expense	[2]	1,150
Foreign Earnings Repatriated		419
Equity income (loss)		$ 228
Increase in Regulatory Liability				27
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred Tax Liabilities, Net				61
Deferred Income Tax Expense (Benefit)				2
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Increase in Regulatory Liability				59
State and Local Jurisdiction [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Operating Loss Carryforwards	[3]			5,577
State and Local Jurisdiction [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Operating Loss Carryforwards	[3]			$ 53
Maximum [Member] | IOWA | Tax Year, Current [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Statutory Income Tax Rate, State and Local, Percent				12.00%
Maximum [Member] | IOWA | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Statutory Income Tax Rate, State and Local, Percent				9.80%
Long-term income tax receivable [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Reclassification of long-term income tax receivable				$ (609)
Long-term income tax receivable adjustments				152
Long-term income tax receivable [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Reclassification of long-term income tax receivable				(609)
Long-term income tax receivable adjustments				$ 115
Parent Company [Member] | Subsequent Event [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Related Party Transaction, Cash Received for Income Taxes, Net			$ 90
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.
[3]	The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ (686)	$ (653)	$ (743)
Current State and Local Tax Expense (Benefit)	(9)	(3)	1
Current foreign	104	83	55
Current Income Tax Expense (Benefit)	(591)	(573)	(687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Deferred foreign	(20)	2	(7)
Deferred State and Local Income Tax Expense (Benefit)	(131)	100	(59)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Total income tax expense (benefit)	$ (583)	$ (554)	$ 403

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Income tax credits		(30.00%)	(20.00%)	(14.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences		(8.00%)	(1.00%)	(0.00%)
State income tax, net of federal income tax benefit		(6.00%)	3.00%	(1.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		(4.00%)	(31.00%)	(0.00%)
Income tax effect of foreign income		(3.00%)	(5.00%)	(6.00%)
Equity income		(1.00%)	2.00%	(2.00%)
Other, net		(1.00%)	(1.00%)	(2.00%)
Effective income tax rate		(30.00%)	(22.00%)	14.00%
Production Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit		10 years
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred state		$ 131	$ (100)	$ 59
UNITED KINGDOM
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 16
Corporate Income Tax Rate, Effective April 1, 2020 [Member] | UNITED KINGDOM
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%
Corporate Income Tax Rate, Effective April 1, 2020 further reduction [Member] | UNITED KINGDOM
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(17.00%)
PacifiCorp [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate		21.00%	35.00%	35.00%
Income tax credits		(7.00%)	(5.00%)	(6.00%)
State income tax, net of federal income tax benefit		(4.00%)	(3.00%)	(3.00%)
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent		(17.00%)	(0.00%)	(0.00%)
Other, net		0.00%	(1.00%)	(1.00%)
Effective income tax rate		1.00%	32.00%	31.00%
Production Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit		10 years
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred state		$ 9	$ (15)	$ (21)

Income Taxes Income Taxes - Rel

Income Taxes Income Taxes - Related Party Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Long-term income tax receivable	$ (457)	$ 0
Parent Company [Member]
Related Party Transaction [Line Items]
Income Taxes Receivable From (Payable To) Related Parties Current	(90)	$ (334)
Long-term income tax receivable	$ 457

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets: [Abstract]
Federal, state and foreign carryforwards	$ 596	$ 1,118
Regulatory liabilities	1,674	1,707
AROs	232	223
Employee benefits	68	45
Other	459	450
Total deferred income tax assets	3,029	3,543
Valuation allowances	(137)	(126)
Total deferred income tax assets, net	2,892	3,417
Deferred income tax liabilities: [ Abstract]
Property-related items	(10,185)	(9,950)
Regulatory assets	(656)	(651)
Investments	(876)	(843)
Other	(222)	(215)
Total deferred income tax liabilities	(11,939)	(11,659)
Net deferred income tax liability	$ (9,047)	$ (8,242)

Income Taxes - Summary of Opera

Income Taxes - Summary of Operating Loss Carryforwards (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Current Income Tax Expense (Benefit)		$ 591	$ 573	$ 687
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	[1]	284
Deferred Tax Assets, Operating Loss Carryforwards		60
Deferred Tax Assets, Tax Credit Carryforwards		45
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	[1]	5,577
Deferred Tax Assets, Operating Loss Carryforwards		312
Deferred Tax Assets, Tax Credit Carryforwards		28
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	[1]	562
Deferred Tax Assets, Operating Loss Carryforwards		151
Deferred Tax Assets, Tax Credit Carryforwards		0
Income Tax Authority, Name [Domain]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	[1]	6,423
Deferred Tax Assets, Operating Loss Carryforwards		523
Deferred Tax Assets, Tax Credit Carryforwards		$ 73
Minimum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2023
Tax Credit Carryforward, Expiration Date		Dec. 31, 2023
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2019
Tax Credit Carryforward, Expiration Date		Dec. 31, 2019
Maximum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2026
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2038
Tax Cuts and Jobs Act of 2017 [Member]
Operating Loss Carryforwards [Line Items]
Current Income Tax Expense (Benefit)		$ (68)
Deferred Income Tax Charge [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Operating Loss Carryforwards [Line Items]
Increase in Regulatory Liability		$ 27
[1]	The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Income Taxes - Net Unrecognized

Income Taxes - Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 181	$ 128
Additions based on tax positions related to the current year	4	6
Additions for tax positions of prior years	38	70
Reductions for tax positions of prior years	(38)	(18)
Statute of limitations	2	(4)
Settlements	(2)	(1)
Ending balance	185	181
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	154	158
Unrecognized tax benefits that would not impact the effective tax rate	$ 31	$ 23

Income Taxes Income Taxes - Pac

Income Taxes Income Taxes - PacifiCorp - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Income Tax Expense (Benefit)			$ 14	$ 26	$ 1,098
Deferred Tax Liabilities, Net			$ 9,047	$ 8,242
PacifiCorp [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent			17.00%	0.00%	0.00%
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Income Tax Expense (Benefit)			$ (196)	$ 74	$ 144
Deferred Tax Liabilities, Net			$ 2,543	$ 2,582
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)			$ 68
Deferred Tax Liabilities, Net	[1]		7,115
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Amortization of Excess Deferred Income Taxes, Amount			$ 127
Federal statutory income tax rate			21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred Income Tax Expense (Benefit)	[1]	$ 1,150
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member] | PacifiCorp [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred Income Tax Expense (Benefit)	[1]		$ 21
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes - PacifiCorp - Com

Income Taxes - PacifiCorp - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Income Tax Expense (Benefit) Components [Line Items]
Current Federal Tax Expense (Benefit)	$ (686)	$ (653)	$ (743)
Current State and Local Tax Expense (Benefit)	(9)	(3)	1
Current Income Tax Expense (Benefit)	(591)	(573)	(687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Deferred State and Local Income Tax Expense (Benefit)	(131)	100	(59)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
PacifiCorp [Member]
Schedule of Income Tax Expense (Benefit) Components [Line Items]
Current Federal Tax Expense (Benefit)	164	249	169
Current State and Local Tax Expense (Benefit)	40	41	32
Current Income Tax Expense (Benefit)	204	290	201
Deferred Federal Income Tax Expense (Benefit)	(187)	59	123
Deferred State and Local Income Tax Expense (Benefit)	(9)	15	21
Deferred Income Tax Expense (Benefit)	(196)	74	144
Other Tax Expense (Benefit)	(3)	(4)	(5)
Income tax (benefit) expense	$ 5	$ 360	$ 340

Income Taxes - PacifiCorp - Rec

Income Taxes - PacifiCorp - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.00%	(3.00%)	1.00%
Income tax credits	(30.00%)	(20.00%)	(14.00%)
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	4.00%	3.00%	3.00%
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent	(17.00%)	(0.00%)	(0.00%)
Income tax credits	(7.00%)	(5.00%)	(6.00%)
Other, net	0.00%	(1.00%)	(1.00%)
Effective income tax rate	1.00%	32.00%	31.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Amortization of Excess Deferred Income Taxes, Amount	$ 127

Income Taxes - PacifiCorp - C_2

Income Taxes - PacifiCorp - Component of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		$ 1,674	$ 1,707
AROs		232	223
Other		459	450
Total deferred income tax assets, net		2,892	3,417
Property-related items		(10,185)	(9,950)
Regulatory assets		(656)	(651)
Other		(222)	(215)
Total deferred income tax liabilities		(11,939)	(11,659)
Net deferred income tax liability		(9,047)	(8,242)
PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		752	756
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits		91	84
Deferred Tax Assets, Derivative Instruments And Unamortized Contract Values		45	48
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, State and Local		77	83
AROs		53	50
Other		56	50
Total deferred income tax assets, net		1,074	1,071
Property-related items		(3,335)	(3,381)
Regulatory assets		(273)	(261)
Other		(9)	(11)
Total deferred income tax liabilities		(3,617)	(3,653)
Net deferred income tax liability		(2,543)	$ (2,582)
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Net deferred income tax liability	[1]	$ (7,115)
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes - PacifiCorp - Sum

Income Taxes - PacifiCorp - Summary of Operating Loss Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 5,577	[1]
Deferred Tax Assets, Operating Loss Carryforwards	312
Deferred Tax Assets, Tax Credit Carryforwards	28
PacifiCorp [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,230
Deferred Tax Assets, Operating Loss Carryforwards	58
Deferred Tax Assets, Tax Credit Carryforwards	$ 19
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2019
Tax Credit Carryforward, Expiration Date	Dec. 31, 2019
Minimum [Member] | PacifiCorp [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2019
Minimum [Member] | PacifiCorp [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2019
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2038
Maximum [Member] | PacifiCorp [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032
[1]	The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Income Taxes Income Taxes - P_2

Income Taxes Income Taxes - PacifiCorp - Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 185	$ 181	$ 128
PacifiCorp [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 1	$ 10

Income Taxes Income Taxes - MEC

Income Taxes Income Taxes - MEC - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%		35.00%
Deferred Tax Liabilities, Net			$ 9,047	$ 8,242
Regulatory Liabilities			7,506	7,511
Current Income Tax Expense (Benefit)			(591)	(573)		$ (687)
Deferred Income Tax Expense (Benefit)			$ 14	$ 26		$ 1,098
MidAmerican Energy Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%		35.00%
Deferred Tax Liabilities, Net			$ 2,322	$ 2,237
Current Income Tax Expense (Benefit)			(288)	(515)		$ (493)
Deferred Income Tax Expense (Benefit)			34	333		$ 362
Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[1]		$ 3,923	4,143
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 7,115
Current Income Tax Expense (Benefit)			68
Deferred Income Tax Expense (Benefit)			$ 68
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Energy Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 12	1,824
Current Income Tax Expense (Benefit)			(27)
Deferred Income Tax Expense (Benefit)			28
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]		5,950
Deferred Income Tax Expense (Benefit)	[2]	$ 1,150
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member] | MidAmerican Energy Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities			$ 12	$ 1,845	[2]
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes Income Taxes - M_2

Income Taxes Income Taxes - MEC - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Current Federal Tax Expense (Benefit)	$ (686)	$ (653)	$ (743)
Current State and Local Tax Expense (Benefit)	(9)	(3)	1
Current Income Tax Expense (Benefit)	(591)	(573)	(687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Deferred State and Local Income Tax Expense (Benefit)	(131)	100	(59)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
MidAmerican Energy Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Current Federal Tax Expense (Benefit)	(276)	(490)	(479)
Current State and Local Tax Expense (Benefit)	(12)	(25)	(14)
Current Income Tax Expense (Benefit)	(288)	(515)	(493)
Deferred Federal Income Tax Expense (Benefit)	42	335	366
Deferred State and Local Income Tax Expense (Benefit)	(8)	(2)	(4)
Deferred Income Tax Expense (Benefit)	34	333	362
Other Tax Expense (Benefit)	(1)	(1)	(1)
Income tax (benefit) expense	$ (255)	$ (183)	$ (132)

Income Taxes Income Taxes - M_3

Income Taxes Income Taxes - MEC - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(30.00%)	(20.00%)	(14.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.00%	(3.00%)	1.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	(8.00%)	(1.00%)	(0.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(4.00%)	(31.00%)	(0.00%)
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Years Eligible For Renewable Energy Production Tax Credit	10 years
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(73.00%)	(68.00%)	(61.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(4.00%)	(4.00%)	(3.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences	(5.00%)	(7.00%)	(3.00%)
Other, net	0.00%	(1.00%)	0.00%
Effective income tax rate	(60.00%)	(43.00%)	(32.00%)
Years Eligible For Renewable Energy Production Tax Credit	10 years
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	1.00%	2.00%	(0.00%)

Income Taxes - MEC - Components

Income Taxes - MEC - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	$ 1,674	$ 1,707
AROs	232	223
Other	459	450
Total deferred income tax assets, net	2,892	3,417
Property-related items	(10,185)	(9,950)
Regulatory assets	(656)	(651)
Other	(222)	(215)
Total deferred income tax liabilities	(11,939)	(11,659)
Net deferred income tax liability	(9,047)	(8,242)
MidAmerican Energy Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	405	443
AROs	164	160
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	47	45
Other	80	57
Total deferred income tax assets, net	696	705
Property-related items	(2,945)	(2,865)
Regulatory assets	(61)	(42)
Other	(12)	(35)
Total deferred income tax liabilities	(3,018)	(2,942)
Net deferred income tax liability	$ (2,322)	$ (2,237)

Income Taxes - MEC - Summary of

Income Taxes - MEC - Summary of Operating Loss Carryforwards (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Federal, state and foreign carryforwards		$ 596	$ 1,118
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	[1]	5,577
MidAmerican Energy Company [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal, state and foreign carryforwards		44
Operating Loss Carryforwards		$ 655
MidAmerican Energy Company [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2,019
MidAmerican Energy Company [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2,037
[1]	The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Income Taxes - MEC - Net Unreco

Income Taxes - MEC - Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 181	$ 128
Additions based on tax positions related to the current year	4	6
Additions for tax positions of prior years	38	70
Reductions for tax positions of prior years	(38)	(18)
Statute of limitations	2	(4)
Settlements	(2)	(1)
Ending balance	185	181
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	154	158
MidAmerican Energy Company [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	12	10
Additions based on tax positions related to the current year	4	1
Additions for tax positions of prior years	47	23
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	(4)	(4)
Reductions for tax positions of prior years	(48)	(19)
Interest and penalties	(1)	1
Ending balance	10	$ 12
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 29

Income Taxes Income Taxes - Mid

Income Taxes Income Taxes - MidAmerican Funding - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%		35.00%
Deferred Tax Liabilities, Net			$ 9,047	$ 8,242
Regulatory Liabilities			7,506	7,511
Current Income Tax Expense (Benefit)			591	573		$ 687
Deferred Income Tax Expense (Benefit)			14	26		$ 1,098
Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[1]		$ 3,923	$ 4,143
MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%		35.00%
Deferred Tax Liabilities, Net			$ 2,319	$ 2,235
Current Income Tax Expense (Benefit)			294	536		$ 501
Deferred Income Tax Expense (Benefit)			$ 33	335		$ 363
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 7,115
Current Income Tax Expense (Benefit)			(68)
Deferred Income Tax Expense (Benefit)			68
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]		$ 5,950
Deferred Income Tax Expense (Benefit)	[2]	$ 1,150
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 12	1,822
Current Income Tax Expense (Benefit)			27
Deferred Income Tax Expense (Benefit)			28
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities			$ 12	$ 1,845	[2]
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes - MidAmerican Fund

Income Taxes - MidAmerican Funding - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Current Federal Tax Expense (Benefit)	$ (686)	$ (653)	$ (743)
Current State and Local Tax Expense (Benefit)	(9)	(3)	1
Current Income Tax Expense (Benefit)	(591)	(573)	(687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Deferred State and Local Income Tax Expense (Benefit)	(131)	100	(59)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Income Tax Expense (Benefit) [Line Items]
Current Federal Tax Expense (Benefit)	(280)	(505)	(485)
Current State and Local Tax Expense (Benefit)	(14)	(31)	(16)
Current Income Tax Expense (Benefit)	(294)	(536)	(501)
Deferred Federal Income Tax Expense (Benefit)	42	338	367
Deferred State and Local Income Tax Expense (Benefit)	(9)	(3)	(4)
Deferred Income Tax Expense (Benefit)	33	335	363
Other Tax Expense (Benefit)	(1)	(1)	(1)
Income tax (benefit) expense	$ (262)	$ (202)	$ (139)

Income Taxes Income Taxes - M_4

Income Taxes Income Taxes - MidAmerican Funding - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Income tax credits	(30.00%)	(20.00%)	(14.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.00%	(3.00%)	1.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	(8.00%)	(1.00%)	(0.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(4.00%)	(31.00%)	(0.00%)
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Years Eligible For Renewable Energy Production Tax Credit	10 years
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Income tax credits	(76.00%)	(77.00%)	(64.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(4.00%)	(6.00%)	(3.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences	(6.00%)	(8.00%)	(3.00%)
Other, net	0.00%	(1.00%)	0.00%
Effective income tax rate	(64.00%)	(54.00%)	(35.00%)
Years Eligible For Renewable Energy Production Tax Credit	10 years
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	1.00%	3.00%	(0.00%)

Income Taxes Income Taxes - M_5

Income Taxes Income Taxes - MidAmerican Funding - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		$ 1,674	$ 1,707
AROs		232	223
Other		459	450
Total deferred income tax assets, net		2,892	3,417
Property-related items		(10,185)	(9,950)
Regulatory assets		(656)	(651)
Other		(222)	(215)
Total deferred income tax liabilities		(11,939)	(11,659)
Net deferred income tax liability		(9,047)	(8,242)
Federal, state and foreign carryforwards		596	1,118
MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		405	443
AROs		164	160
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits		47	45
Other		85	62
Total deferred income tax assets, net		701	710
Property-related items		(2,947)	(2,868)
Regulatory assets		(62)	(42)
Other		(11)	(35)
Total deferred income tax liabilities		(3,020)	(2,945)
Net deferred income tax liability		(2,319)	$ (2,235)
State and Local Jurisdiction [Member]
Deferred Tax Assets and Liabilities [Line Items]
Operating Loss Carryforwards	[1]	5,577
State and Local Jurisdiction [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Federal, state and foreign carryforwards		44
Operating Loss Carryforwards		$ 655
Minimum [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2,019
Maximum [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2,037
[1]	The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Income Taxes - MidAmerican Fu_2

Income Taxes - MidAmerican Funding - Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 181	$ 128
Additions based on tax positions related to the current year	4	6
Additions for tax positions of prior years	38	70
Reductions for tax positions of prior years	(38)	(18)
Statute of limitations	2	(4)
Settlements	(2)	(1)
Ending balance	185	181
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	154	158
MidAmerican Funding, LLC and Subsidiaries [Domain]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	12	10
Additions based on tax positions related to the current year	4	1
Additions for tax positions of prior years	47	23
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	(4)	(4)
Reductions for tax positions of prior years	(48)	(19)
Interest and penalties	(1)	1
Ending balance	10	$ 12
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 30

Income Taxes Income Taxes - NPC

Income Taxes Income Taxes - NPC - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Tax Liabilities, Net			$ 9,047	$ 8,242
Regulatory Liabilities			7,506	7,511
Deferred Income Tax Expense (Benefit)			14	26	$ 1,098
Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[1]		$ 3,923	$ 4,143
Nevada Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Tax Liabilities, Net			$ 749	$ 767
Regulatory Liabilities			1,186	1,121
Deferred Income Tax Expense (Benefit)			$ (13)	95	$ 79
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 7,115
Deferred Income Tax Expense (Benefit)			68
Increase (Decrease) in Deferred Income Taxes			(27)
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]		$ 5,950
Deferred Income Tax Expense (Benefit)	[2]	$ 1,150
Tax Cuts and Jobs Act of 2017 [Member] | Nevada Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]			787
Deferred Income Tax Expense (Benefit)			$ 12
Increase (Decrease) in Deferred Income Taxes			$ (5)
Tax Cuts and Jobs Act of 2017 [Member] | Nevada Power Company [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]			$ 792
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes - NPC - Components

Income Taxes - NPC - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Current federal tax expense (benefit)	$ (591)	$ (573)	$ (687)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
Nevada Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Current federal tax expense (benefit)	84	62	68
Deferred Income Tax Expense (Benefit)	(13)	95	79
Unrecognized Tax Benefits, Period Increase (Decrease)	2	0	0
Other Tax Expense (Benefit)	(1)	(1)	(1)
Income tax (benefit) expense	$ 72	$ 156	$ 146

Income Taxes - NPC - Reconcilia

Income Taxes - NPC - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	8.00%	1.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	4.00%	31.00%	0.00%
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Nevada Power Company [Member]
Income Tax Contingency [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Merger Charges, Percent	3.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	0.00%	1.00%	0.00%
Other, net	0.00%	1.00%	(1.00%)
Effective income tax rate	24.00%	38.00%	34.00%
Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Contingency [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Nevada Power Company [Member]
Income Tax Contingency [Line Items]
Federal statutory income tax rate	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.00%	1.00%	0.00%

Income Taxes - NPC - Componen_2

Income Taxes - NPC - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	$ 1,674	$ 1,707
Employee benefits	68	45
Other	459	450
Total deferred income tax assets	3,029	3,543
Property-related items	(10,185)	(9,950)
Regulatory assets	(656)	(651)
Other	(222)	(215)
Total deferred income tax liabilities	(11,939)	(11,659)
Net deferred income tax liability	(9,047)	(8,242)
Nevada Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	209	201
Deferred Tax Assets, Tax Deferred Expense, Leases	97	100
Employee benefits	15	18
Deferred Tax Assets, Customer Advances	18	14
Other	9	6
Total deferred income tax assets	348	339
Property-related items	(799)	(796)
Regulatory assets	(196)	(206)
Deferred Tax Liabilities, Tax Deferred Expense, Leases	(94)	(97)
Other	(8)	(7)
Total deferred income tax liabilities	(1,097)	(1,106)
Net deferred income tax liability	$ (749)	$ (767)

Income Taxes Income Taxes - SPP

Income Taxes Income Taxes - SPPC - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Tax Liabilities, Net			$ 9,047	$ 8,242
Regulatory Liabilities			7,506	7,511
Deferred Income Tax Expense (Benefit)			14	26	$ 1,098
Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[1]		$ 3,923	$ 4,143
Sierra Pacific Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	35.00%	35.00%
Deferred Tax Liabilities, Net			$ 331	$ 330
Regulatory Liabilities			$ 509	$ 500
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Tax Liabilities, Net	[2]		$ 7,115
Deferred Income Tax Expense (Benefit)			68
Increase (Decrease) in Deferred Income Taxes			(27)
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Regulatory Liabilities	[2]		$ 5,950
Deferred Income Tax Expense (Benefit)	[2]	$ 1,150
Tax Cuts and Jobs Act of 2017 [Member] | Sierra Pacific Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)			$ 4
Increase (Decrease) in Deferred Income Taxes			(2)
Tax Cuts and Jobs Act of 2017 [Member] | Sierra Pacific Power Company [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred Tax Liabilities, Net	[2]		342
Regulatory Liabilities	[2]		$ 341
[1]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. See Note 11 for further discussion of 2017 Tax Reform impacts.
[2]	(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.

Income Taxes - SPPC - Component

Income Taxes - SPPC - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit) [Line Items]
Current Income Tax Expense (Benefit)	$ (591)	$ (573)	$ (687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
Sierra Pacific Power Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Current Income Tax Expense (Benefit)	23	0	0
Deferred Federal Income Tax Expense (Benefit)	7	56	50
Unrecognized Tax Benefits, Period Increase (Decrease)	1	0	0
Other Tax Expense (Benefit)	(1)	(1)	(1)
Income tax (benefit) expense	$ 30	$ 55	$ 49

Income Taxes - SPPC - Reconcili

Income Taxes - SPPC - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	8.00%	1.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	4.00%	31.00%	0.00%
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	4.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	0.00%	0.00%	1.00%
Other, net	0.00%	0.00%	1.00%
Effective income tax rate	25.00%	34.00%	37.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.00%	(1.00%)	0.00%

Income Taxes - SPPC - Compone_2

Income Taxes - SPPC - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	$ 1,674	$ 1,707
Employee benefits	68	45
Other	459	450
Total deferred income tax assets	3,029	3,543
Property-related items	(10,185)	(9,950)
Regulatory assets	(656)	(651)
Other	(222)	(215)
Total deferred income tax liabilities	(11,939)	(11,659)
Net deferred income tax liability	(9,047)	(8,242)
Sierra Pacific Power Company [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities	70	67
Deferred Tax Assets, Operating Loss and Credit Carryforwards, Federal	0	10
Employee benefits	10	10
Deferred Tax Assets, Tax Deferred Expense, Leases	8	7
Deferred Tax Assets, Customer Advances	8	7
Other	6	6
Total deferred income tax assets	102	107
Property-related items	(346)	(349)
Regulatory assets	(73)	(74)
Deferred Tax Liabilities, Tax Deferred Expense, Leases	(8)	(7)
Other	(6)	(7)
Total deferred income tax liabilities	(433)	(437)
Net deferred income tax liability	$ (331)	$ (330)

Income Taxes Income Taxes - M_6

Income Taxes Income Taxes - MidAmerican Funding - Tax Rate Change (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	$ 9,047	$ 8,242
Deferred Income Tax Expense (Benefit)	14	26	$ 1,098
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	2,319	2,235
Deferred Income Tax Expense (Benefit)	33	$ 335	$ 363
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	61
Deferred Income Tax Expense (Benefit)	2
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | Deferred Income Tax Charge [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	59
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	54
Deferred Income Tax Expense (Benefit)	2
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain] | Deferred Income Tax Charge [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 56
IOWA | Maximum [Member] | Tax Year, Current [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	12.00%
IOWA | Maximum [Member] | Tax Year, Current [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	12.00%
IOWA | Maximum [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	9.80%
IOWA | Maximum [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	9.80%

Income Taxes Income Taxes - M_7

Income Taxes Income Taxes - MEC - Tax Rate Change (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	$ 9,047	$ 8,242
Deferred Income Tax Expense (Benefit)	14	26	$ 1,098
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	61
Deferred Income Tax Expense (Benefit)	$ 2
Maximum [Member] | IOWA | Tax Year, Current [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	12.00%
Maximum [Member] | IOWA | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	9.80%
Deferred Income Tax Charge [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 59
MidAmerican Energy Company [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	2,322	2,237
Deferred Income Tax Expense (Benefit)	34	$ 333	$ 362
MidAmerican Energy Company [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	54
Deferred Income Tax Expense (Benefit)	$ 2
MidAmerican Energy Company [Member] | Maximum [Member] | Tax Year, Current [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	12.00%
MidAmerican Energy Company [Member] | Maximum [Member] | IOWA | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent	9.80%
MidAmerican Energy Company [Member] | Deferred Income Tax Charge [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 56

Supplemental Cash Flow Disclo_3

Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents		$ 627	$ 935
Restricted Cash and Cash Equivalents, Current		227	327
Restricted Cash and Cash Equivalents, Noncurrent		29	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		883	1,283	$ 1,003	$ 1,332
Interest paid, net of amounts capitalized		1,713	1,715	1,673
Income Taxes Paid, Net	[1]	(780)	(540)	(1,016)
Capital Expenditures Incurred but Not yet Paid		823	653	547
Capital Expenditures Incurred Deferred Payments		0	100	0
Related Party Transaction, Cash Received for Income Taxes, Net		$ 900	$ 600	$ 1,053
[1]	Includes $884 million, $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018, 2017 and 2016, respectively.

Supplemental Cash Flow Disclo_4

Supplemental Cash Flow Disclosures - PacifiCorp (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents		$ 627	$ 935
Interest paid, net of amounts capitalized		1,713	1,715	$ 1,673
Income Taxes Paid, Net	[1]	(780)	(540)	(1,016)
Accruals related to property, plant and equipment additions		823	653	547
Restricted Cash and Cash Equivalents, Current		227	327
Restricted Cash and Cash Equivalents, Noncurrent		29	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		883	1,283	1,003	$ 1,332
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents		77	14
Interest paid, net of amounts capitalized		347	350	350
Income Taxes Paid, Net		144	340	201
Accruals related to property, plant and equipment additions		184	147	101
Restricted Cash and Cash Equivalents, Current		13	13
Restricted Cash and Cash Equivalents, Noncurrent		2	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 92	$ 29	$ 33	$ 28
[1]	Includes $884 million, $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018, 2017 and 2016, respectively.

Supplemental Cash Flow Disclo_5

Supplemental Cash Flow Disclosures - MEC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized		$ 1,713	$ 1,715	$ 1,673
Income taxes received, net	[1]	780	540	1,016
Accruals related to property, plant and equipment additions		823	653	547
MidAmerican Energy Company [Member]
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized		198	193	181
Income taxes received, net		494	465	601
Accruals related to property, plant and equipment additions		371	224	131
Dividend, Noncash, Transfer Of Operations		$ 0	$ 0	$ 90
[1]	Includes $884 million, $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018, 2017 and 2016, respectively.

Supplemental Cash Flow Disclo_6

Supplemental Cash Flow Disclosures - MidAmerican Funding (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents		$ 627	$ 935
Restricted Cash and Cash Equivalents, Current		227	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		883	1,283	$ 1,003	$ 1,332
Interest paid, net of amounts capitalized		1,713	1,715	1,673
Income taxes received, net	[1]	780	540	1,016
Accruals related to property, plant and equipment additions		823	653	547
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents		1	172
Restricted Cash and Cash Equivalents, Current		56	110
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		57	282	27	$ 105
Interest paid, net of amounts capitalized		218	218	204
Income taxes received, net		511	472	609
Accruals related to property, plant and equipment additions		371	224	131
Dividend, Noncash, Transfer Of Operations		$ 0	$ 0	$ 90
[1]	Includes $884 million, $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018, 2017 and 2016, respectively.

Supplemental Cash Flow Disclo_7

Supplemental Cash Flow Disclosures - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 627	$ 935
Restricted Cash and Cash Equivalents, Current	227	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	883	1,283	$ 1,003	$ 1,332
Interest paid, net of amounts capitalized	1,713	1,715	1,673
Accruals related to property, plant and equipment additions	823	653	547
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	111	57
Restricted Cash and Cash Equivalents, Current	10	9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	121	66	290	$ 547
Interest paid, net of amounts capitalized	166	167	173
Income Taxes Paid	117	89	0
Accruals related to property, plant and equipment additions	34	18	19
Capital and Financial Lease Obligations Incurred	$ 1	$ 0	$ (1)

Supplemental Cash Flow Disclo_8

Supplemental Cash Flow Disclosures - SPPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 627	$ 935
Restricted Cash and Cash Equivalents, Current	227	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	883	1,283	$ 1,003	$ 1,332
Interest paid, net of amounts capitalized	1,713	1,715	1,673
Accruals related to property, plant and equipment additions	823	653	547
Sierra Pacific Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	71	4
Restricted Cash and Cash Equivalents, Current	5	4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	76	8	60	$ 111
Interest paid, net of amounts capitalized	41	40	47
Income Taxes Paid	19	0	0
Accruals related to property, plant and equipment additions	15	10	15
Capital and Financial Lease Obligations Incurred	$ 6	$ 1	$ 0

Related Party Transactions - Pa

Related Party Transactions - PacifiCorp (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Related Party Transaction, Cash Received for Income Taxes, Net	$ 900	$ 600	$ 1,053
PacifiCorp [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	12	11	10
Due to Affiliate, Current			0
PacifiCorp [Member] | Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current		0	0
Purchases from Related Party	8	6	7
PacifiCorp [Member] | BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	1	3
Purchases from Related Party	33	35	37
PacifiCorp [Member] | MEHC Insurance Services Ltd. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Proceeds From Insurance Claims	0	0	0
PacifiCorp [Member] | BHE [Member]
Related Party Transaction [Line Items]
Income Taxes Receivable From (Payable To) Related Parties Current	(10)	59
Related Party Transaction, Cash Received for Income Taxes, Net	(144)	(340)	(201)
PacifiCorp [Member] | Equity Method Investee [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	13	18
Purchases from Related Party	$ 163	$ 170	$ 174

Related Party Transactions Re_2

Related Party Transactions Related Party Transactions - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Related Party Transaction, Cash Received for Income Taxes, Net	$ 900	$ 600	$ 1,053
MidAmerican Energy Company [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expense Reimbursement	51	53	41
Due from Affiliate, Current	8	9
Due to Affiliate, Current	12	16
Due from Affiliate, Noncurrent	20	16
Due to Affiliate, Noncurrent	36	45
MidAmerican Energy Company [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Proceeds From Transfer of Asset	15
MidAmerican Energy Company [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	11	9	6
Income Taxes Receivable From (Payable To) Related Parties Current	(156)	51
Related Party Transaction, Cash Received for Income Taxes, Net	494	465	601
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	$ 127	$ 122	$ 135

Related Party Transactions - Mi

Related Party Transactions - MidAmerican Funding (Details) $ in Millions		12 Months Ended
		Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,114	$ 9,051
Related Party Transaction, Cash Received for Income Taxes, Net		900	600	$ 1,053
MidAmerican Funding, LLC and Subsidiaries [Domain]
Related Party Transaction [Line Items]
Notes Payable, Related Parties, Current		$ 156	164
Maximum Debt to Capitalization Ratio		0.67
Minumum Interest Coverage Ratio		2.2
MidAmerican Funding, LLC and Subsidiaries [Domain] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expense Reimbursement		$ 44	46	35
Due from Affiliate, Current		5	9
Due to Affiliate, Current		12	14
Due from Affiliate, Noncurrent		20	16
Due to Affiliate, Noncurrent		36	45
MidAmerican Funding, LLC and Subsidiaries [Domain] | BHE [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Proceeds From Transfer of Asset		15
Related Party Transaction, Expenses from Transactions with Related Party		11	9	6
Income Taxes Receivable From (Payable To) Related Parties Current		(156)	64
Related Party Transaction, Cash Received for Income Taxes, Net		511	472	609
MidAmerican Funding, LLC and Subsidiaries [Domain] | Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Purchases from Related Party		127	122	$ 135
MidAmerican Funding, LLC and Subsidiaries [Domain] | Revolving Credit Arrangement, $300 million [Member] | Line of Credit [Member] | MHC, Inc. [Member] | BHE [Member]
Related Party Transaction [Line Items]
Line of Credit Arrangement Offered to Affiliate, Maximum Amount Available		300
Notes Payable, Related Parties, Current		$ 156	$ 164
Debt, Weighted Average Interest Rate		2.629%	1.629%
MidAmerican Funding, LLC and Subsidiaries [Domain] | Revolving Credit Arrangement, $100 million [Member] | Line of Credit [Member] | MHC, Inc. [Member] | BHE [Member]
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Notes Receivable, Related Parties, Current		$ 0	$ 0
MidAmerican Funding, LLC and Subsidiaries [Domain] | Revolving Credit Arrangement, $100 million [Member] | Line of Credit [Member] | MHC, Inc. [Member] | BHE [Member]
Related Party Transaction [Line Items]
Debt, Weighted Average Interest Rate		0.00%	0.00%
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

Related Party Transactions - NP

Related Party Transactions - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Related Party Transaction, Cash Received for Income Taxes, Net	$ 900	$ 600	$ 1,053
Nevada Power Company [Member] | Berkshire Hathaway Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	2	2	2
Nevada Power Company [Member] | Kern River [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	58	66	68
Due to Affiliate	4	5
Nevada Power Company [Member] | Sierra Pacific Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	15	17	14
Due from Affiliates	5	5
Due to Affiliate	0	0
Related Party Transaction, Expense Reimbursement	28	27	24
Nevada Power Company [Member] | NV Energy, Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	7	10	10
Due from Affiliates	0	0
Due to Affiliate	26	29
Related Party Transaction, Expense Reimbursement	1	0	1
Income Taxes Receivable From (Payable To) Related Parties Current	4	38
Related Party Transaction, Cash Received for Income Taxes, Net	117	89	0
Nevada Power Company [Member] | Electric Distribution [Member] | PacifiCorp [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	0	0	0
Revenue from Related Parties	3	3	2
Due from Affiliates	0	0
Due to Affiliate	0	0
Nevada Power Company [Member] | Electric Distribution [Member] | Sierra Pacific Power Company [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	28	21	17
Revenue from Related Parties	91	104	$ 78
Due from Affiliates	6	10
Due to Affiliate	$ 1	$ 0

Related Party Transactions - SP

Related Party Transactions - SPPC (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Related Party Transaction, Cash Received for Income Taxes, Net	$ 900,000,000	$ 600,000,000	$ 1,053,000,000
Sierra Pacific Power Company [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	1,000,000	1,000,000	1,000,000
Sierra Pacific Power Company [Member] | NV Energy, Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	4,000,000	5,000,000	5,000,000
Due from Affiliates	0	0
Due to Affiliate	15,000,000	17,000,000
Income Taxes Receivable From (Payable To) Related Parties Current	3,000,000	0	0
Related Party Transaction, Cash Received for Income Taxes, Net	19,000,000	0	0
Sierra Pacific Power Company [Member] | Nevada Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	28,000,000	27,000,000	24,000,000
Due from Affiliates	0	0
Due to Affiliate	5,000,000	5,000,000
Related Party Transaction, Expense Reimbursement	15,000,000	17,000,000	14,000,000
Sierra Pacific Power Company [Member] | Electric Distribution [Member] | Nevada Power Company [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	28,000,000	21,000,000	17,000,000
Due from Affiliates	1,000,000	0
Purchases from Related Party	91,000,000	104,000,000	$ 78,000,000
Due to Affiliate	$ 6,000,000	$ 10,000,000

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1
Pension Plan [Member] | UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	19	$ 23	$ 20
Defined Benefit Plan, Interest Cost	56	58	72
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(101)	(100)	(110)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(44)	(31)	0
Defined Benefit Plan Net Amortization	45	63	44
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	63	75	26
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	1	4
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(164)	(160)	(160)
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	21	0	0
Defined Benefit Plan Net Amortization	28	25	46
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11	5	41
Pension Plan [Member] | Domestic Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	9	9	10
Defined Benefit Plan, Interest Cost	28	31	34
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(44)	(44)	(44)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(1)
Defined Benefit Plan Net Amortization	2	2	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(6)	(2)	2
Pension Plan [Member] | Domestic Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(9)	(6)	(2)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	(7)	(7)
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(41)	(40)	(41)
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
Defined Benefit Plan Net Amortization	(13)	(14)	(12)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(21)	(16)	(13)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	5	5	5
Defined Benefit Plan, Interest Cost	8	9	10
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(13)	(14)	(13)
Defined Benefit Plan Net Amortization	(4)	(4)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(4)	(4)	(2)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (2)	$ (1)	$ (1)

Employee Benefit Plans - Funded

Employee Benefit Plans - Funded Status (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 8,000,000	$ 0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Plan Assets, Amount	736,000,000	666,000,000	$ 666,000,000	$ 664,000,000	$ 736,000,000
Defined Benefit Plan, Benefit Obligation	721,000,000	734,000,000	734,000,000	672,000,000	721,000,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(8,000,000)	15,000,000
Other assets				5,000,000	32,000,000
Other current liabilities				0	0
Liability, Defined Benefit Plan, Noncurrent				(13,000,000)	(17,000,000)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(8,000,000)	15,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	736,000,000	666,000,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	8,000,000	5,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8,000,000	10,000,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(38,000,000)	106,000,000
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50,000,000)	(51,000,000)
Ending balance	664,000,000	736,000,000	666,000,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	721,000,000	734,000,000
Defined Benefit Plan, Service Cost	9,000,000	9,000,000	9,000,000
Defined Benefit Plan, Interest Cost	24,000,000	29,000,000	31,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8,000,000	10,000,000
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(40,000,000)	(10,000,000)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Benefits Paid	(50,000,000)	(51,000,000)
Ending balance	672,000,000	721,000,000	734,000,000
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets				417,000,000	126,000,000
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation				429,000,000	143,000,000
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets				417,000,000	126,000,000
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation				429,000,000	143,000,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				256,000,000	272,000,000
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Plan Assets, Amount	2,368,000,000	2,169,000,000	2,169,000,000	1,989,000,000	2,368,000,000
Defined Benefit Plan, Benefit Obligation	2,201,000,000	2,125,000,000	2,125,000,000	1,833,000,000	2,201,000,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan				156,000,000	167,000,000
Other assets				156,000,000	167,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,368,000,000	2,169,000,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	60,000,000	58,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	1,000,000	1,000,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(44,000,000)	145,000,000
Defined Benefit Plan, Plan Assets, Payment for Settlement	(205,000,000)	(144,000,000)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(71,000,000)	(68,000,000)
Foreign Currency Exchange Rate Changes	120,000,000	207,000,000
Ending balance	1,989,000,000	2,368,000,000	2,169,000,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	2,201,000,000	2,125,000,000
Defined Benefit Plan, Service Cost	19,000,000	23,000,000	20,000,000
Defined Benefit Plan, Interest Cost	56,000,000	58,000,000	72,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	1,000,000	1,000,000
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(87,000,000)	(4,000,000)
Benefits Paid	(71,000,000)	(68,000,000)
Foreign currency exchange rate changes	(112,000,000)	197,000,000
Ending balance	1,833,000,000	2,201,000,000	2,125,000,000
Defined Benefit Plan, Accumulated Benefit Obligation				1,637,000,000	1,933,000,000
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	(182,000,000)	(131,000,000)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Plan Assets, Amount	2,761,000,000	2,525,000,000	2,525,000,000	2,396,000,000	2,761,000,000
Defined Benefit Plan, Benefit Obligation	3,006,000,000	2,952,000,000	2,952,000,000	2,718,000,000	3,006,000,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(322,000,000)	(245,000,000)
Other assets				20,000,000	66,000,000
Other current liabilities				(13,000,000)	(14,000,000)
Liability, Defined Benefit Plan, Noncurrent				(329,000,000)	(297,000,000)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(322,000,000)	(245,000,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,761,000,000	2,525,000,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	38,000,000	64,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(147,000,000)	390,000,000
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	(21,000,000)	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	(119,000,000)	(15,000,000)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137,000,000)	(203,000,000)
Ending balance	2,396,000,000	2,761,000,000	2,525,000,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	3,006,000,000	2,952,000,000
Defined Benefit Plan, Service Cost	21,000,000	24,000,000	29,000,000
Defined Benefit Plan, Interest Cost	105,000,000	116,000,000	126,000,000
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(160,000,000)	132,000,000
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	2,000,000	0
Benefits Paid	(137,000,000)	(203,000,000)
Ending balance	2,718,000,000	3,006,000,000	$ 2,952,000,000
Defined Benefit Plan, Accumulated Benefit Obligation				2,709,000,000	2,988,000,000
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	$ (119,000,000)	$ (15,000,000)
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets				1,752,000,000	2,016,000,000
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation				2,091,000,000	2,327,000,000
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation				2,085,000,000	2,316,000,000
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets				1,752,000,000	2,016,000,000
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation				2,091,000,000	2,327,000,000
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation				$ 2,085,000,000	$ 2,316,000,000

Employee Benefit Plans - Unreco

Employee Benefit Plans - Unrecognized Amounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax				$ (8)	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	$ 510	$ 510		480	510
Beginning balance	510
Ending balance	480	510
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax				(22)	(37)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax				7	7
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	(16)	43	$ 43	35	(16)
Beginning balance	(16)	43
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(38)	(73)
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	13	(14)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	51	(59)
Ending balance	35	(16)	43
Other Postretirement Benefits Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	10	55	55	44	10
Beginning balance	10	55
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	23	(52)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	11	(7)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	34	(45)
Ending balance	44	10	55
Other Postretirement Benefits Plan [Member] | Regulatory Liability, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	(26)	(12)	(12)	(10)	(26)
Beginning balance	(26)	(12)
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(14)	(21)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(2)	(7)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	16	(14)
Ending balance	(10)	(26)	(12)
Other Postretirement Benefits Plan [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	1			1
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(1)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	1
Ending balance	1
Pension Plan [Member] | UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax				472	510
Pension Plan [Member] | UNITED KINGDOM | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(30)	(80)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(59)	(50)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(8)	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	510	590	590	480	510
Beginning balance	510	590
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	45	(63)
Foreign currency exchange rate changes	(30)	50
Ending balance	480	510	590
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	(22)	(17)
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Unamortized Prior Service Cost Arising During Period, Before Tax	2
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax				0	(3)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax				(1)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	642	761	761	746	642
Beginning balance	642	761
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(151)	94
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	(21)	0	0
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	28	25
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	104	(119)
Ending balance	746	642	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	(21)
Pension Plan [Member] | Domestic Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Unamortized Prior Service Cost Arising During Period, Before Tax	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	665	761	761	730	665
Beginning balance	665	761
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	114	(68)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(28)	28
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	65	(96)
Ending balance	730	665	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	(21)
Pension Plan [Member] | Domestic Plan [Member] | Regulatory Liability, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Unamortized Prior Service Cost Arising During Period, Before Tax	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	(43)	(13)	(13)	0	(43)
Beginning balance	(43)	(13)
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(43)	(29)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	(1)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	43	(30)
Ending balance	0	(43)	(13)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	0
Pension Plan [Member] | Domestic Plan [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Unamortized Prior Service Cost Arising During Period, Before Tax	(2)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	20	13	13	$ 16	$ 20
Beginning balance	20	13
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(6)	(3)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	4
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	(4)	7
Ending balance	16	$ 20	$ 13
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	$ 0

Employee Benefit Plans - Plan A

Employee Benefit Plans - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	6.80%	7.10%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2,025	2,025
Pension Plan [Member] | UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.90%	2.60%	2.70%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.55%	3.45%	3.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Rate Of Future Price Inflation	3.05%	2.95%	3.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.60%	2.70%	3.70%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	4.90%	5.00%	5.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.45%	3.00%	2.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Rate of Future Price Inflation	2.95%	3.00%	2.90%
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.06%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%	2.75%	2.75%
Interest Crediting Rates for Cash Balance Plan, First Year	3.38%	2.49%	2.57%
Interest Crediting Rates for Cash Balance Plan, Third Year	3.54%	3.06%	2.57%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.56%	2.72%	3.01%
Interest Crediting Rates for Cash Balance Plan, Fifth Year		2.72%	3.01%
Interest Crediting Rates for Cash Balance Plan, Sixth Year			3.01%
Interest Crediting Rates for Cash Balance Plan, Second Year	3.54%	3.06%	2.57%
Interest crediting rates for cash balance plan	3.38%	2.49%	2.57%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.06%	4.43%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.36%	6.55%	6.78%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.75%	2.75%	2.75%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.21%	3.57%	4.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.57%	4.01%	4.33%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.44%	6.73%	7.03%
PacifiCorp [Member] | Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.05%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.25%
Interest crediting rates for cash balance plan	3.40%	1.61%	2.06%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.05%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%	7.25%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase			2.75%
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.05%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.05%	4.35%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.86%	7.25%	7.50%
Nonunion pension plan participant [Member] | PacifiCorp [Member] | Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Third Year		2.26%	1.44%
Interest Crediting Rates for Cash Balance Plan, Fourth Year		1.60%	2.05%
Interest Crediting Rates for Cash Balance Plan, Second Year	3.40%	2.26%	1.44%
Union pension plan participant [Member] | PacifiCorp [Member] | Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Third Year	3.15%	2.78%	2.35%
Interest Crediting Rates for Cash Balance Plan, Fourth Year		2.60%	3.05%
Interest Crediting Rates for Cash Balance Plan, Second Year	3.15%	2.78%	2.35%

Employee Benefit Plans - Contri

Employee Benefit Plans - Contributions and Benefit Payments (Details) - Dec. 31, 2018 £ in Millions, $ in Millions	USD ($)	GBP (£)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 1
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	53
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	57
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	55
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	54
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	53
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	243
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	13
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	221
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	224
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	221
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	212
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	212
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	958
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | £		£ 43
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	70
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	71
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	73
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	75
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	77
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 416

Employee Benefit Plans - Asset

Employee Benefit Plans - Asset Allocations (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		65.00%	68.00%
Percentage of Investment Funds Comprised Of Debt Securities		35.00%	32.00%
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		59.00%	62.00%
Percentage of Investment Funds Comprised Of Debt Securities		41.00%	38.00%
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		36.00%	21.00%
Percentage of Investment Funds Comprised Of Debt Securities		64.00%	79.00%
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.50
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.35
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.05
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.55
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.40
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.15
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		59.00%	63.00%
Percentage of Investment Funds Comprised Of Debt Securities		41.00%	37.00%
PacifiCorp [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		55.00%	60.00%
Percentage of Investment Funds Comprised Of Debt Securities		45.00%	40.00%
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.33
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.62
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.01
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
PacifiCorp [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.30
PacifiCorp [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.48
PacifiCorp [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.06
PacifiCorp [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.37
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.66
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.03
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
PacifiCorp [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.43
PacifiCorp [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.65
PacifiCorp [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.12
PacifiCorp [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.25
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.45
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
MidAmerican Energy Company [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.20
MidAmerican Energy Company [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.60
MidAmerican Energy Company [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.02
MidAmerican Energy Company [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.45
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.80
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.05
MidAmerican Energy Company [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.50
MidAmerican Energy Company [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.80
MidAmerican Energy Company [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.08
MidAmerican Energy Company [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.03
NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	4000.00%
NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	6000.00%
NV Energy, Inc. [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.53
NV Energy, Inc. [Member] | Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.23
NV Energy, Inc. [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.77
NV Energy, Inc. [Member] | Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.47
[1]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
[2]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
[3]	PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.

Employee Benefit Plans - Fair V

Employee Benefit Plans - Fair Value Measurements (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		$ (38)		$ 106
Defined Benefit Plan, Plan Assets, Payment for Settlement		0		0
Defined Benefit Plan, Plan Assets, Amount		664		736		$ 666
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		389		443
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		120		115
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12		14
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		10		11	[1]
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2		3	[1]
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13		20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13		20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42		36
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42		36
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45		46
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45		46
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30		29
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30		29
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158		185
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158		185	[1]
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6		8
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6		8	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 203		$ 220
Percentage of Investment Funds Comprised Of Equity Securitites		65.00%		68.00%
Percentage of Investment Funds Comprised Of Debt Securities		35.00%		32.00%
Percentage Of Investment Funds Invested in United States Securities		79.00%		73.00%
Percentage Of Investment Funds Invested In International Securities		21.00%		27.00%
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 202		$ 219
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1		1
Other Postretirement Benefits Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		509		558
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		664		736
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		149		174	[2]
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6		4
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		(44)		145
Defined Benefit Plan, Plan Assets, Payment for Settlement		(205)		(144)
Defined Benefit Plan, Plan Assets, Amount		1,989		2,368		2,169
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)		(120)		(207)
UNITED KINGDOM | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	894		874
UNITED KINGDOM | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		756		1,057
UNITED KINGDOM | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	239		230
UNITED KINGDOM | Pension Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		62		34
UNITED KINGDOM | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		3		4	[3]
UNITED KINGDOM | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	59		30
UNITED KINGDOM | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	0		0
UNITED KINGDOM | Pension Plan [Member] | United Kingdom Government Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		891		870
UNITED KINGDOM | Pension Plan [Member] | United Kingdom Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		891		870
UNITED KINGDOM | Pension Plan [Member] | United Kingdom Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	[3]	0
UNITED KINGDOM | Pension Plan [Member] | United Kingdom Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	$ 697		$ 1,027
Percentage of Investment Funds Comprised Of Equity Securitites		36.00%		21.00%
Percentage of Investment Funds Comprised Of Debt Securities		64.00%		79.00%
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3],[4]	$ 0		$ 0
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		697		1,027
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[3],[4]
UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		239		230
UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		239	[3]	230	[3]	105	$ 204
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held		23		6		10
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement		0		104		(80)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)		(14)		15		(29)
UNITED KINGDOM | Pension Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1,889		2,161
UNITED KINGDOM | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1,989		2,368
UNITED KINGDOM | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	100		207
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		(147)		390
Defined Benefit Plan, Plan Assets, Payment for Settlement		(119)		(15)
Defined Benefit Plan, Plan Assets, Amount		2,396		2,761		$ 2,525
Domestic Plan [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		887		1,069
Domestic Plan [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		572		572	[5]
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		49		86
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		8		10
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		41		76
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		160		218
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		160		218
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		373		350
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		373		350	[5]
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		29		16
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		29		16
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		123		110
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		123		110
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		493		622
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		492		622	[5]
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1		0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		108		136
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		108		136
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 119		$ 103	[6]
Percentage of Investment Funds Comprised Of Equity Securitites		59.00%		62.00%
Percentage of Investment Funds Comprised Of Debt Securities		41.00%		38.00%
Percentage Of Investment Funds Invested in United States Securities		73.00%		68.00%
Percentage Of Investment Funds Invested In International Securities		27.00%		32.00%
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 119		$ 83	[5],[6]
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0		20
Domestic Plan [Member] | Pension Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1,459		1,641
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2,396		2,761
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		792		1,019	[6]
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		104		63	[7]
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 41		$ 38
[1]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35%, respectively, for 2018 and 68% and 32%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 79% and 21%, respectively, for 2018 and 73% and 27%, respectively, for 2017.
[3]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[4]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 36% and 64%, respectively, for 2018 and 21% and 79%, respectively, for 2017.
[5]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[6]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41%, respectively, for 2018 and 62% and 38%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 73% and 27%, respectively, for 2018 and 68% and 32%, respectively, for 2017.
[7]	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

Employee Benefit Plans - Level

Employee Benefit Plans - Level 3 Rollforward (Details) - UNITED KINGDOM - Pension Plan [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance		$ 2,368		$ 2,169
Foreign Currency Exchange Rate Changes		(120)		(207)
Ending balance		1,989		2,368		$ 2,169
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	[1]	230
Ending balance	[1]	239		230
Real Estate Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance		230
Ending balance		239		230
Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance		230	[1]	105		204
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held		23		6		10
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement		0		104		(80)
Foreign Currency Exchange Rate Changes		(14)		15		(29)
Ending balance		$ 239	[1]	$ 230	[1]	$ 105
[1]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.

Employee Benefit Plans - Define

Employee Benefit Plans - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 112	$ 103	$ 102

Employee Benefit Plans - Pacifi

Employee Benefit Plans - PacifiCorp - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	$ 0	$ 0	$ 0
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(41)	(40)	(41)
Defined Benefit Plan Net Amortization	(13)	(14)	(12)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(21)	(16)	(13)
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
Defined Benefit Plan, Service Cost	2	2	2
Defined Benefit Plan, Interest Cost	11	14	15
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(21)	(21)	(21)
Defined Benefit Plan Net Amortization	(6)	(6)	(5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(14)	(11)	(9)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	(21)	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	119	15
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(164)	(160)	(160)
Defined Benefit Plan Net Amortization	28	25	46
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11	5	41
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	22	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	52
Defined Benefit Plan, Service Cost	0	0	4
Defined Benefit Plan, Interest Cost	43	49	54
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(72)	(72)	(75)
Defined Benefit Plan Net Amortization	13	14	34
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 6	$ (9)	$ 17

Employee Benefit Plans - Paci_2

Employee Benefit Plans - PacifiCorp - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 736	$ 666
Defined Benefit Plan, Plan Assets, Contributions by Employer	8	5
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(38)	106
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Ending balance	664	736	$ 666
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	721	734
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(40)	(10)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Defined Benefit Plan, Benefit Obligation	721	734	734	$ 672	$ 721
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(8)	15
Assets for Plan Benefits, Defined Benefit Plan				5	32
Other current liabilities				0	0
Liability, Defined Benefit Plan, Noncurrent				(13)	(17)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(8)	15
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				256	272
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	332	302
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	1
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	5	7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(16)	49
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(25)	(27)
Ending balance	297	332	302
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	331	358
Defined Benefit Plan, Service Cost	2	2	2
Defined Benefit Plan, Interest Cost	11	14	15
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	5	7
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(26)	(23)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(25)	(27)
Defined Benefit Plan, Benefit Obligation	331	358	358	298	331
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(1)	1
Assets for Plan Benefits, Defined Benefit Plan				0	1
Other current liabilities				0	0
Liability, Defined Benefit Plan, Noncurrent				(1)	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(1)	1
PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				52	60
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,761	2,525
Defined Benefit Plan, Plan Assets, Contributions by Employer	38	64
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(147)	390
Defined Benefit Plan, Plan Assets, Payment for Settlement	(119)	(15)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Ending balance	2,396	2,761	2,525
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	3,006	2,952
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(160)	132
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Defined Benefit Plan, Benefit Obligation	3,006	2,952	2,952	2,718	3,006
Defined Benefit Plan, Accumulated Benefit Obligation				2,709	2,988
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(322)	(245)
Assets for Plan Benefits, Defined Benefit Plan				20	66
Other current liabilities				(13)	(14)
Liability, Defined Benefit Plan, Noncurrent				(329)	(297)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(322)	(245)
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,111	999
Defined Benefit Plan, Plan Assets, Contributions by Employer	4	54
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(52)	166
Defined Benefit Plan, Plan Assets, Payment for Settlement	(52)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(69)	(108)
Ending balance	942	1,111	999
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	1,251	1,276
Defined Benefit Plan, Service Cost	0	0	4
Defined Benefit Plan, Interest Cost	43	49	54
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(68)	34
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(69)	(108)
Defined Benefit Plan, Benefit Obligation	$ 1,251	$ 1,276	$ 1,276	1,105	1,251
Defined Benefit Plan, Accumulated Benefit Obligation				1,105	1,251
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(163)	(140)
Assets for Plan Benefits, Defined Benefit Plan				3	5
Other current liabilities				(4)	(4)
Liability, Defined Benefit Plan, Noncurrent				(162)	(141)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(163)	(140)
Cash and Cash Equivalents [Member] | PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				1	9
Other Noncurrent Assets [Member] | PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				$ 51	$ 51

Employee Benefit Plans - Paci_3

Employee Benefit Plans - PacifiCorp - Unrecognized Amounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	$ 480	$ 510
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	50	14
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	(22)	(37)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	7	7
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	35	(16)	$ 43
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(38)	(73)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	13	(14)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	51	(59)
Other Postretirement Benefits Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	44	10	55
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	23	(52)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	11	(7)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	34	(45)
Other Postretirement Benefits Plan [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	1
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(1)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	1
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	(2)	(12)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	0	(6)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	7	7
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	5	(11)
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	5	(11)	34
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	10	(51)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	6	6
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	16	(45)
Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	22
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	747	649
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	0	(3)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	(1)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	746	642	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(151)	94
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	28	25
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	104	(119)
Domestic Plan [Member] | Pension Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	730	665	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	114	(68)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(28)	28
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	65	(96)
Domestic Plan [Member] | Pension Plan [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	16	20	13
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(6)	(3)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	4
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	(4)	7
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	461	442
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	0	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	(1)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	460	438	511
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	57	(59)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(13)	(14)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	22	(73)
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	443	418	491
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	59	(60)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(12)	(13)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(22)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	25	(73)
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	17	20	$ 20
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(2)	1
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(1)	(1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	$ (3)	$ 0

Employee Benefit Plans - Paci_4

Employee Benefit Plans - PacifiCorp - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.21%	3.57%	4.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.57%	4.01%	4.33%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.44%	6.73%	7.03%
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.05%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.05%	4.35%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.86%	7.25%	7.50%
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Second Year	3.54%	3.06%	2.57%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.56%	2.72%	3.01%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.06%
Interest crediting rates for cash balance plan	3.38%	2.49%	2.57%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%	2.75%	2.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.06%	4.43%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.36%	6.55%	6.78%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.75%	2.75%	2.75%
Interest Crediting Rates for Cash Balance Plan, Third Year	3.54%	3.06%	2.57%
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.25%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.05%
Interest crediting rates for cash balance plan	3.40%	1.61%	2.06%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.05%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%	7.25%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase			2.75%
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Union pension plan participant [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Second Year	3.15%	2.78%	2.35%
Interest Crediting Rates for Cash Balance Plan, Fourth Year		2.60%	3.05%
Interest Crediting Rates for Cash Balance Plan, Third Year	3.15%	2.78%	2.35%
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Nonunion pension plan participant [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Second Year	3.40%	2.26%	1.44%
Interest Crediting Rates for Cash Balance Plan, Fourth Year		1.60%	2.05%
Interest Crediting Rates for Cash Balance Plan, Third Year		2.26%	1.44%

Employee Benefit Plans - Paci_5

Employee Benefit Plans - PacifiCorp - Contributions and Benefit Payments (Details) $ in Millions	Dec. 31, 2018USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 1
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	53
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	57
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	55
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	54
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	53
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	243
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	24
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	26
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	23
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	22
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	21
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	95
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	13
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	221
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	224
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	221
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	212
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	212
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	958
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	4
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	105
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	102
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	98
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	92
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	88
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 369

Employee Benefit Plans - Paci_6

Employee Benefit Plans - PacifiCorp - Asset Allocations (Details) - PacifiCorp [Member]	12 Months Ended
	Dec. 31, 2018
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.33	[1],[2],[3]
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.62	[1],[2],[3]
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.01	[3]
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.37	[1],[2],[3]
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.66	[1],[2],[3]
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.03	[3]
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Domestic Plan [Member] | Minimum [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.30	[1],[2],[3]
Domestic Plan [Member] | Minimum [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.48	[1],[2],[3]
Domestic Plan [Member] | Minimum [Member] | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.06	[3]
Domestic Plan [Member] | Minimum [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Domestic Plan [Member] | Maximum [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.43	[1],[2],[3]
Domestic Plan [Member] | Maximum [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.65	[1],[2],[3]
Domestic Plan [Member] | Maximum [Member] | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.12	[3]
Domestic Plan [Member] | Maximum [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
[1]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
[2]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
[3]	PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.

Employee Benefit Plans - Paci_7

Employee Benefit Plans - PacifiCorp - Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 664	$ 736		$ 666
Defined Benefit Plan, Benefit Obligation		672	721		734
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		389	443
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		120	115
Other Postretirement Benefits Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		509	558
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	14
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		10	11	[1]
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2	3	[1]
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13	20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13	20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42	36
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42	36
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45	46
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45	46
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30	29
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30	29
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158	185
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158	185	[1]
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	8
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	8	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 203	$ 220
Percentage of Investment Funds Comprised Of Equity Securitites		65.00%	68.00%
Percentage of Investment Funds Comprised Of Debt Securities		35.00%	32.00%
Percentage Of Investment Funds Invested in United States Securities		79.00%	73.00%
Percentage Of Investment Funds Invested In International Securities		21.00%	27.00%
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 202	$ 219
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1	1
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		297	332		302
Defined Benefit Plan, Benefit Obligation		298	331		358
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		132	151
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		43	37
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		175	188
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5	7
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4	4
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1	3
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		3	11
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		3	11
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		23	16
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		23	16
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2	2
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2	2
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		17	16
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		17	16
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		83	98
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		83	98
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4	6
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4	6
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 38	$ 32
Percentage of Investment Funds Comprised Of Equity Securitites		59.00%	63.00%
Percentage of Investment Funds Comprised Of Debt Securities		41.00%	37.00%
Percentage Of Investment Funds Invested in United States Securities		90.00%	77.00%
Percentage Of Investment Funds Invested In International Securities		10.00%	23.00%
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 38	$ 32
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		664	736
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		149	174	[2]
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	4
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		297	332
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	116	140
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	6	4
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2,396	2,761		2,525
Defined Benefit Plan, Benefit Obligation		2,718	3,006		2,952
Defined Benefit Plan, Accumulated Benefit Obligation		2,709	2,988
Domestic Plan [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		887	1,069
Domestic Plan [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		572	572	[5]
Domestic Plan [Member] | Pension Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1,459	1,641
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		49	86
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		8	10
Domestic Plan [Member] | Pension Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		41	76
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		160	218
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		160	218
Domestic Plan [Member] | Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Domestic Plan [Member] | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		373	350
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		373	350	[5]
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		29	16
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		29	16
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		123	110
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		123	110
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		493	622
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		492	622	[5]
Domestic Plan [Member] | Pension Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1	0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		108	136
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		108	136
Domestic Plan [Member] | Pension Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[5]
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 119	$ 103	[6]
Percentage of Investment Funds Comprised Of Equity Securitites		59.00%	62.00%
Percentage of Investment Funds Comprised Of Debt Securities		41.00%	38.00%
Percentage Of Investment Funds Invested in United States Securities		73.00%	68.00%
Percentage Of Investment Funds Invested In International Securities		27.00%	32.00%
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 119	$ 83	[5],[6]
Domestic Plan [Member] | Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	20
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		942	1,111		999
Defined Benefit Plan, Benefit Obligation		1,105	1,251		$ 1,276
Defined Benefit Plan, Accumulated Benefit Obligation		1,105	1,251
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		400	483
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		153	149
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		553	632
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		11	43
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		11	43
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4	45
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4	45
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		88	60
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		88	60
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		10	9
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		10	9
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		43	37
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		43	37
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		327	416
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		327	416
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		15	22
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		15	22
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	$ 0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 54
Percentage of Investment Funds Comprised Of Equity Securitites		55.00%	60.00%
Percentage of Investment Funds Comprised Of Debt Securities		45.00%	40.00%
Percentage Of Investment Funds Invested in United States Securities		68.00%	57.00%
Percentage Of Investment Funds Invested In International Securities		32.00%	43.00%
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 54
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2,396	$ 2,761
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		792	1,019	[6]
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		104	63	[7]
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			1,111
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	285	416
Domestic Plan [Member] | Pension Plan [Member] | Accounting Standards Update 2015-07 [Member] | PacifiCorp [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	$ 104	$ 63
[1]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35%, respectively, for 2018 and 68% and 32%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 79% and 21%, respectively, for 2018 and 73% and 27%, respectively, for 2017.
[3]	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 55% and 45% respectively, for 2018 and 60% and 40%, respectively, for 2017, and are invested in United States and international securities of approximately 68% and 32%, respectively, for 2018 and 57% and 43%, respectively, for 2017.
[4]	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.
[5]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[6]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 59% and 41%, respectively, for 2018 and 62% and 38%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 73% and 27%, respectively, for 2018 and 68% and 32%, respectively, for 2017.
[7]	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

Employee Benefit Plans - Paci_8

Employee Benefit Plans - PacifiCorp - Multiemployer and Joint Trust Pension Plans (Details) - PacifiCorp [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Joint Trustee Plan, Percentage By Which Joint Trustee Plan was at Least Funded				0.00%		80.00%	80.00%
Joint Trustee Plan, Period Contributions	[1]	$ 7	$ 7		$ 8
UMWA Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Withdrawal Obligation, Most Recent Estimate		$ 115
Multiemployer Plans, Certified Zone Status [Fixed List]				Red		Red	Red
[1]	PacifiCorp's minimum contributions to the plan are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements, subject to ERISA minimum funding requirements.

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 39	$ 39	$ 34
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Payment for Settlement	119	$ 15
Pension Plan [Member] | Domestic Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 52

Employee Benefit Plans - MEC -

Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	9	$ 9	$ 9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(41)	(40)	(41)
Defined Benefit Plan Net Amortization	(13)	(14)	(12)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(21)	(16)	(13)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	5	5	5
Defined Benefit Plan, Interest Cost	8	9	10
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(13)	(14)	(13)
Defined Benefit Plan Net Amortization	(4)	(4)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(4)	(4)	(2)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(2)	(1)	(1)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(164)	(160)	(160)
Defined Benefit Plan Net Amortization	28	25	46
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11	5	41
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(1)
Defined Benefit Plan, Service Cost	9	9	10
Defined Benefit Plan, Interest Cost	28	31	34
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(44)	(44)	(44)
Defined Benefit Plan Net Amortization	2	2	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(6)	(2)	2
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (9)	$ (6)	$ (2)

Employee Benefit Plans - MEC _2

Employee Benefit Plans - MEC - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 8	$ 0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	736	666
Defined Benefit Plan, Plan Assets, Contributions by Employer	8	5
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(38)	106
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Ending balance	664	736	$ 666
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	721	734
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(40)	(10)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Ending balance	672	721	734
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(8)	15
Assets for Plan Benefits, Defined Benefit Plan	5	32
Other current liabilities	0	0
Liability, Defined Benefit Plan, Noncurrent	(13)	(17)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(8)	15
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount	256	272
MidAmerican Energy Company [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount	191	198
MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	745
Ending balance	644	745
MidAmerican Energy Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	277	252
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	1
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	1	1
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(17)	36
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(15)	(13)
Ending balance	247	277	252
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	246	233
Defined Benefit Plan, Service Cost	5	5	5
Defined Benefit Plan, Interest Cost	8	9	10
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	1	1
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(3)	11
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(15)	(13)
Ending balance	242	246	233
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	5	31
Assets for Plan Benefits, Defined Benefit Plan	5	31
Other current liabilities	0	0
Liability, Defined Benefit Plan, Noncurrent	0	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	5	31
MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount	116	118
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,761	2,525
Defined Benefit Plan, Plan Assets, Contributions by Employer	38	64
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(147)	390
Defined Benefit Plan, Plan Assets, Payment for Settlement	(119)	(15)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Ending balance	2,396	2,761	2,525
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	3,006	2,952
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(160)	132
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	2	0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	119	15
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Ending balance	2,718	3,006	2,952
Defined Benefit Plan, Accumulated Benefit Obligation	2,709	2,988
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(322)	(245)
Assets for Plan Benefits, Defined Benefit Plan	20	66
Other current liabilities	(13)	(14)
Liability, Defined Benefit Plan, Noncurrent	(329)	(297)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(322)	(245)
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	745	684
Defined Benefit Plan, Plan Assets, Contributions by Employer	7	7
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(39)	114
Defined Benefit Plan, Plan Assets, Payment for Settlement	(37)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(32)	(60)
Ending balance	644	745	684
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	799	773
Defined Benefit Plan, Service Cost	9	9	10
Defined Benefit Plan, Interest Cost	28	31	34
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(33)	46
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	2
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	(37)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(32)	(60)
Ending balance	736	799	$ 773
Defined Benefit Plan, Accumulated Benefit Obligation	733	790
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(92)	(54)
Assets for Plan Benefits, Defined Benefit Plan	17	66
Other current liabilities	(7)	(8)
Liability, Defined Benefit Plan, Noncurrent	(102)	(112)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(92)	(54)
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	120
Ending balance	109	120
Defined Benefit Plan, Accumulated Benefit Obligation	$ 109	$ 118

Employee Benefit Plans - MEC _3

Employee Benefit Plans - MEC - Unrecognized Amounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	$ 480	$ 510
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(1)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	50	14
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	(22)	(37)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	35	(16)	$ 43
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(38)	(73)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	13	(14)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	51	(59)
Other Postretirement Benefits Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	44	10	55
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	23	(52)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	11	(7)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	34	(45)
Other Postretirement Benefits Plan [Member] | Regulatory Liability, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	(10)	(26)	(12)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(14)	(21)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(2)	(7)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	16	(14)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	48	23
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	(20)	(25)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	28	(2)	5
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	26	(11)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	4	4
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	30	(7)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	37	14	18
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	20	(7)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	3	3
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	23	(4)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Receivables (Payables) With Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	(9)	(16)	(13)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	6	(4)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	1	1
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	7	(3)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	747	649
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	0	(3)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	746	642	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(151)	94
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	28	25
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	104	(119)
Domestic Plan [Member] | Pension Plan [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	730	665	761
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	114	(68)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(28)	28
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	65	(96)
Domestic Plan [Member] | Pension Plan [Member] | Regulatory Liability, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	0	(43)	(13)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	(43)	(29)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	(1)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	43	(30)
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Gains (Losses), Before Tax	40	(11)
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Net Prior Service Cost (Credit), Before Tax	1	1
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	41	(10)	16
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	52	(24)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(2)	(2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	1
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	51	(26)
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member] | Regulatory Asset, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	25	24	22
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	2	4
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	(2)	(2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	1
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	1	2
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member] | Regulatory Liability, Pension and Other Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	0	(41)	(12)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	41	(29)
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	41	(29)
Domestic Plan [Member] | Pension Plan [Member] | MidAmerican Energy Company [Member] | Receivables (Payables) With Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Before Tax	16	7	$ 6
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Defined Benefit Plan, Net Unamortized Gain (Loss) Arising During Period, Before Tax	9	1
Defined Benefit Plan, Net Amortization Recognized in Net Periodic Benefit Cost Before Tax	0	0
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Arising During Period, Before Tax	$ 9	$ 1

Employee Benefit Plans - MEC _4

Employee Benefit Plans - MEC - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	6.80%	7.10%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2,025	2,025
United States Non-Union Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.21%	3.57%	4.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.57%	4.01%	4.33%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.44%	6.73%	7.03%
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	6.80%	7.10%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2,025	2,025
MidAmerican Energy Company [Member] | United States Non-Union Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.15%	3.50%	3.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.50%	3.90%	4.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.25%	6.50%	6.75%
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.06%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%	2.75%	2.75%
Interest Crediting Rates for Cash Balance Plan, First Year	3.38%	2.49%	2.57%
Interest Crediting Rates for Cash Balance Plan, Second Year	3.54%	3.06%	2.57%
Interest crediting rates for cash balance plan	3.38%	2.49%	2.57%
Interest Crediting Rates for Cash Balance Plan, Sixth Year			3.01%
Interest Crediting Rates for Cash Balance Plan, Fifth Year		2.72%	3.01%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.56%	2.72%	3.01%
Interest Crediting Rates for Cash Balance Plan, Third Year	3.54%	3.06%	2.57%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.06%	4.43%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.36%	6.55%	6.78%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.75%	2.75%	2.75%
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.60%	4.10%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%	2.75%	2.75%
Interest Crediting Rates for Cash Balance Plan, First Year	2.26%	1.44%	1.18%
Interest Crediting Rates for Cash Balance Plan, Second Year	3.40%	2.26%	1.44%
Interest crediting rates for cash balance plan	2.26%	1.44%	1.18%
Interest Crediting Rates for Cash Balance Plan, Sixth Year			2.10%
Interest Crediting Rates for Cash Balance Plan, Fifth Year		1.60%	2.10%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	3.40%	1.60%	2.10%
Interest Crediting Rates for Cash Balance Plan, Third Year	3.40%	2.26%	1.44%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.10%	4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.50%	6.75%	7.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.75%	2.75%	2.75%
After-tax [Member] | MidAmerican Energy Company [Member] | United States Non-Union Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	4.13%	4.81%	5.00%

Employee Benefit Plans - MEC _5

Employee Benefit Plans - MEC - Contributions and Benefit Payments (Details) $ in Millions	Dec. 31, 2018USD ($)
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 7
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	61
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	62
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	61
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	60
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	58
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	262
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	1
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	53
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	57
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	55
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	54
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	53
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	243
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	1
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	19
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	21
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	22
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	22
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	22
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 102

Employee Benefit Plans - MEC _6

Employee Benefit Plans - MEC - Asset Allocations (Details) - MidAmerican Energy Company [Member]	12 Months Ended
	Dec. 31, 2018
Minimum [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.2	[1]
Minimum [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.6	[1]
Minimum [Member] | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.02
Minimum [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.25	[1]
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.45	[1]
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Maximum [Member] | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.5	[1]
Maximum [Member] | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	.8	[1]
Maximum [Member] | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	.08
Maximum [Member] | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.03
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.45	[1]
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.8	[1]
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0
Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.05
[1]	(1)For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

Employee Benefit Plans - MEC _7

Employee Benefit Plans - MEC - Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 664	$ 736		$ 666
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		389	443
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		120	115
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	14
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		10	11	[1]
Other Postretirement Benefits Plan [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		2	3	[1]
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13	20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		13	20
Other Postretirement Benefits Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42	36
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		42	36
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45	46
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		45	46
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30	29
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		30	29
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158	185
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		158	185	[1]
Other Postretirement Benefits Plan [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	8
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	8	[1]
Other Postretirement Benefits Plan [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 203	$ 220
Percentage of Investment Funds Comprised Of Equity Securitites		65.00%	68.00%
Percentage of Investment Funds Comprised Of Debt Securities		35.00%	32.00%
Percentage Of Investment Funds Invested in United States Securities		79.00%	73.00%
Percentage Of Investment Funds Invested In International Securities		21.00%	27.00%
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 202	$ 219
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		1	1
Other Postretirement Benefits Plan [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		509	558
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		664	736
Other Postretirement Benefits Plan [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		149	174	[2]
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		247	277		$ 252
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		180	207
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		67	70
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5	6
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		5	6
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	5
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	5
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	14
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	14
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		43	44
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		43	44
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	12
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12	12
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		73	84
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		73	84
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	$ 96	$ 112
Percentage of Investment Funds Comprised Of Equity Securitites		78.00%	81.00%
Percentage of Investment Funds Comprised Of Debt Securities		22.00%	19.00%
Percentage Of Investment Funds Invested in United States Securities		41.00%	42.00%
Percentage Of Investment Funds Invested In International Securities		59.00%	58.00%
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	$ 96	$ 112
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	0	0
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]	0	0
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		644	745
Pension Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			276
Pension Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			116
Pension Plan [Member] | MidAmerican Energy Company [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		20	17
Pension Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		20	17
Pension Plan [Member] | MidAmerican Energy Company [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	21
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	21
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		63	59
Pension Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		63	59
Pension Plan [Member] | MidAmerican Energy Company [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	7
Pension Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		6	7
Pension Plan [Member] | MidAmerican Energy Company [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		37	33
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		37	33
Pension Plan [Member] | MidAmerican Energy Company [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		111	137
Pension Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		111	137
Pension Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		35	44
Pension Plan [Member] | MidAmerican Energy Company [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		35	44
Pension Plan [Member] | MidAmerican Energy Company [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	$ 65	$ 74
Percentage of Investment Funds Comprised Of Equity Securitites		65.00%	69.00%
Percentage of Investment Funds Comprised Of Debt Securities		35.00%	31.00%
Percentage Of Investment Funds Invested in United States Securities		74.00%	72.00%
Percentage Of Investment Funds Invested In International Securities		26.00%	28.00%
Pension Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]	$ 65	$ 74
Pension Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan [Member] | MidAmerican Energy Company [Member] | Plan Asset Categories Excluding Investments Measured with a NAV excluding the Practical Expedient [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	392
Pension Plan [Member] | MidAmerican Energy Company [Member] | Accounting Standards Update 2015-07 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[4]		315
Pension Plan [Member] | MidAmerican Energy Company [Member] | Accounting Standards Update 2015-07 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 41	$ 38
[1]	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35%, respectively, for 2018 and 68% and 32%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 79% and 21%, respectively, for 2018 and 73% and 27%, respectively, for 2017.
[3]	(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22%, respectively, for 2018 and 81% and 19%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 41% and 59%, respectively, for 2018 and 42% and 58%, respectively, for 2017.
[4]	(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35%, respectively, for 2018 and 69% and 31%, respectively, for 2017. Additionally, these funds are invested in United States and international securities of approximately 74% and 26%, respectively, for 2018 and 72% and 28%, respectively, for 2017.

Employee Benefit Plans - MEC _8

Employee Benefit Plans - MEC - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 22	$ 20	$ 20

Employee Benefit Plans - MidAme

Employee Benefit Plans - MidAmerican Funding - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 3	$ 4	$ 4
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(21)	(16)	(13)
Other Postretirement Benefits Plan [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (2)	$ (3)	$ (1)

Retirement Plan and Postretir_3

Retirement Plan and Postretirement Benefits - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ (13)	$ (17)
Liability, Defined Benefit Plan, Current	0	0
Defined Benefit Plan, Plan Assets, Contributions by Employer	8	5
Nevada Power Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	0	$ 0
Nevada Power Company [Member] | NV Energy, Inc. [Member] | Other Noncurrent Liabilities [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(1)	(1)
Qualified Plan [Member] | Nevada Power Company [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	19	1	36
Qualified Plan [Member] | Nevada Power Company [Member] | NV Energy, Inc. [Member] | Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(26)	(23)
Nonqualified Plan [Member] | Nevada Power Company [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	1	$ 0
Nonqualified Plan [Member] | Nevada Power Company [Member] | NV Energy, Inc. [Member] | Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(9)	(10)
Nonqualified Plan [Member] | Nevada Power Company [Member] | NV Energy, Inc. [Member] | Other Current Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

Retirement Plan and Postretir_4

Retirement Plan and Postretirement Benefits - SPPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 8	$ 5
Liability, Defined Benefit Plan, Noncurrent	(13)	(17)
Other current liabilities	0	0
Sierra Pacific Power Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	6	4	$ 1
Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(13)	(20)
Qualified Plan [Member] | Sierra Pacific Power Company [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	6	1	27
Qualified Plan [Member] | Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(19)	(2)
Nonqualified Plan [Member] | Sierra Pacific Power Company [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	1	$ 0
Nonqualified Plan [Member] | Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(7)	(8)
Nonqualified Plan [Member] | Sierra Pacific Power Company [Member] | Other Current Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other current liabilities	$ (1)	$ (1)

Asset Retirement Obligations -

Asset Retirement Obligations - Asset Retirement Obligation By Type (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		$ 985	$ 954	$ 954
Regulatory Liabilities		7,506	7,511
Fossil Fuel Plant [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		371	380
Quad Cities Station [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		345	342
Wind Generating Facility [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		174	138
Offshore pipeline facilities [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		33	32
Solar Generating Facility [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		20	19
Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		42	43
Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[1]	2,426	2,349
Quad Cities Station nuclear decommissioning trust funds [Member]
Asset Retirement Obligations By Type [Line Items]
Nuclear decommissioning trust funds		$ 504	$ 515
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

Asset Retirement Obligations _2

Asset Retirement Obligations - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 954	$ 954
Asset Retirement Obligation, Revision of Estimate	10	(18)
Asset Retirement Obligation, Liabilities Incurred	28	21
Retirements	(45)	(45)
Asset Retirement Obligation, Accretion Expense	38	42
Asset Retirement Obligation	954	954	$ 985	$ 954
Asset Retirement Obligation, Current			43	60
Asset Retirement Obligations, Noncurrent			$ 942	$ 894
Ending Balance	$ 985	$ 954

Asset Retirement Obligations _3

Asset Retirement Obligations - PacifiCorp - Asset Retirement Obligations By Type (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	$ 7,346	$ 7,309
PacifiCorp [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	2,978	2,996
PacifiCorp [Member] | Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	$ 994	$ 955

Asset Retirement Obligations _4

Asset Retirement Obligations - PacifiCorp - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 954	$ 954
Asset Retirement Obligation, Revision of Estimate	10	(18)
Asset Retirement Obligation, Liabilities Incurred	28	21
Retirements	(45)	(45)
Asset Retirement Obligation, Accretion Expense	38	42
Asset Retirement Obligation, Current	43	60
Asset Retirement Obligations, Noncurrent	942	894
Ending Balance	985	954
PacifiCorp [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	215	215
Asset Retirement Obligation, Revision of Estimate	9	(8)
Asset Retirement Obligation, Liabilities Incurred	0	6
Retirements	(5)	(6)
Asset Retirement Obligation, Accretion Expense	8	8
Asset Retirement Obligation, Current	21	25
Asset Retirement Obligations, Noncurrent	206	190
Ending Balance	$ 227	$ 215

Asset Retirement Obligations _5

Asset Retirement Obligations - MEC - Asset Retirement Obligations By Type (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		$ 985	$ 954	$ 954
Regulatory Liabilities		7,506	7,511
Quad Cities Unit Nos 1 and 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		345	342
Fossil Fuel Plant [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		371	380
Wind Generating Facility [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		174	138
Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		42	43
MidAmerican Energy Company [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		562	559	$ 567
Decommissioning Fund Investments, Fair Value		504
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		345	342
MidAmerican Energy Company [Member] | Fossil Fuel Plant [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		93	113
MidAmerican Energy Company [Member] | Wind Generating Facility [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		123	103
MidAmerican Energy Company [Member] | Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		1	1
Quad Cities Unit Nos 1 and 2 [Member] | MidAmerican Energy Company [Member]
Asset Retirement Obligations By Type [Line Items]
Decommissioning Fund Investments, Fair Value		504	515
Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[1]	2,426	2,349
Removal Costs [Member] | MidAmerican Energy Company [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities		$ 708	$ 688
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

Asset Retirement Obligations _6

Asset Retirement Obligations - MEC - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 954	$ 954
Asset Retirement Obligation, Revision of Estimate	10	(18)
Asset Retirement Obligation, Liabilities Incurred	28	21
Asset Retirement Obligation, Liabilities Settled	(45)	(45)
Asset Retirement Obligation, Accretion Expense	38	42
Asset Retirement Obligation, Current	43	60
Asset Retirement Obligations, Noncurrent	942	894
Ending Balance	985	954
MidAmerican Energy Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	559	567
Asset Retirement Obligation, Revision of Estimate	(10)	(14)
Asset Retirement Obligation, Liabilities Incurred	17	8
Asset Retirement Obligation, Liabilities Settled	(28)	(26)
Asset Retirement Obligation, Accretion Expense	24	24
Asset Retirement Obligation, Current	10	31
Asset Retirement Obligations, Noncurrent	552	528
Ending Balance	$ 562	$ 559

Asset Retirement Obligations _7

Asset Retirement Obligations - NPC - Asset Retirement Obligation by Type (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities		$ 7,506	$ 7,511
Asset Retirement Obligation		985	954	$ 954
Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		42	43
Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[1]	2,426	2,349
Nevada Power Company [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities		1,186	1,121
Asset Retirement Obligation		83	80	$ 83
Nevada Power Company [Member] | Waste water remediation [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		37	39
Nevada Power Company [Member] | Evaporative Ponds and Dry Ash Landfills [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		12	11
Nevada Power Company [Member] | Asbestos [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		5	3
Nevada Power Company [Member] | Solar [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		2	3
Nevada Power Company [Member] | Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		27	24
Nevada Power Company [Member] | Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[2]	$ 320	$ 307
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

Asset Retirement Obligations As

Asset Retirement Obligations Asset Retirement Obligations - NPC - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 954	$ 954
Asset Retirement Obligation, Revision of Estimate	10	(18)
Retirements	(45)	(45)
Asset Retirement Obligation, Accretion Expense	38	42
Ending Balance	985	954
Asset Retirement Obligation, Current	43	60
Asset Retirement Obligations, Noncurrent	942	894
Nevada Power Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	80	83
Asset Retirement Obligation, Revision of Estimate	11	6
Retirements	(11)	(13)
Asset Retirement Obligation, Accretion Expense	3	4
Ending Balance	83	80
Asset Retirement Obligation, Current	13	4
Asset Retirement Obligations, Noncurrent	$ 70	$ 76

Asset Retirement Obligations _8

Asset Retirement Obligations - SPPC - Asset Retirement Obligation by Type (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities		$ 7,506	$ 7,511
Asset Retirement Obligation		985	954	$ 954
Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		42	43
Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[1]	2,426	2,349
Sierra Pacific Power Company [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities		509	500
Asset Retirement Obligation		10	10	$ 10
Sierra Pacific Power Company [Member] | Asbestos [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		5	5
Sierra Pacific Power Company [Member] | Evaporative Ponds and Dry Ash Landfills [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		2	2
Sierra Pacific Power Company [Member] | Other Plant in Service [Member]
Asset Retirement Obligations By Type [Line Items]
Asset Retirement Obligation		3	3
Sierra Pacific Power Company [Member] | Removal Costs [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	[2]	$ 210	$ 211
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

Asset Retirement Obligations _9

Asset Retirement Obligations - SPPC - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 954	$ 954
Retirements	(45)	(45)
Ending Balance	985	954
Asset Retirement Obligation, Current	43	60
Asset Retirement Obligations, Noncurrent	942	894
Sierra Pacific Power Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	10	10
Retirements	0	0
Ending Balance	10	10
Asset Retirement Obligation, Current	0	0
Asset Retirement Obligations, Noncurrent	$ 10	$ 10

Commitments and Contingencies -

Commitments and Contingencies - Legal (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Property, plant and equipment, net	$ 68,595	$ 65,871	$ 62,509
Equity method investments	2,440	1,834
PacifiCorp [Member]
Loss Contingencies [Line Items]
Property, plant and equipment, net	$ 19,591	$ 19,203	$ 19,162
Topaz [Member] | Counterparty Bankruptcy [Member]
Loss Contingencies [Line Items]
Property, Plant and Equipment Disclosure [Text Block]	1
Property, plant and equipment, net	$ 1,100
Non-Recourse Debt	$ 900
Property, Plant and Equipment [Abstract]
Revenue from Contract with Customer [Abstract]	1
Agua Caliente [Member] | Counterparty Bankruptcy [Member]
Loss Contingencies [Line Items]
Equity method investment, ownership percentage	49.00%
Non-Recourse Debt	$ 800
Equity method investments	$ 44
Property, Plant and Equipment [Abstract]
Revenue from Contract with Customer [Abstract]	1

Commitments and Contingencies_3

Commitments and Contingencies - Commitments Table (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)number_of_projects	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 197
Operating Leases, Future Minimum Payments, Due in Two Years	177
Operating Leases, Future Minimum Payments, Due in Three Years	160
Operating Leases, Future Minimum Payments, Due in Four Years	139
Operating Leases, Future Minimum Payments, Due in Five Years	111
Operating Leases, Future Minimum Payments, Due Thereafter	1,738
Operating Leases, Future Minimum Payments Due	2,522
Contractual Obligation, Due in Next Twelve Months	5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Operating Leases, Rent Expense	191	$ 156	$ 156
MidAmerican Funding [Member]
Contractual Obligation [Line Items]
Coal transportation costs, railroad	$ 111	$ 109	$ 137
Number of Construction Projects | number_of_projects	4
Fuel, capacity and transmission contract commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 2,215
Purchase Obligation, Due in Second Year	1,659
Purchase Obligation, Due in Third Year	1,380
Purchase Obligation, Due in Fourth Year	1,174
Purchase Obligation, Due in Fifth Year	1,047
Purchase Obligation, Due after Fifth Year	11,155
Purchase Obligation	18,630
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,330
Purchase Obligation, Due in Second Year	587
Purchase Obligation, Due in Third Year	52
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	2,969
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	$ 2,829

Commitments and Contingencies _

Commitments and Contingencies – Hydroelectric (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Hydroelectric [Line Items]
Operating Leases, Rent Expense	$ 191,000,000	$ 156,000,000	$ 156,000,000
PacifiCorp [Member]
Hydroelectric [Line Items]
Capital expenditures required by hydroelectric licenses	155,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
Hydroelectric [Line Items]
Dam removal cost limit	200,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
Hydroelectric [Line Items]
Dam removal cost limit	184,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
Hydroelectric [Line Items]
Dam removal cost limit	16,000,000
Additional dam removal costs, California bond measure	250,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | VARIOUS [Domain]
Hydroelectric [Line Items]
Klamath Relicensing and Settlement Costs	44,000,000
PacifiCorp [Member]
Hydroelectric [Line Items]
Capital expenditures required by hydroelectric licenses	155,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
Hydroelectric [Line Items]
Dam removal cost limit	200,000,000
Public Utilities Property Plant & Equipment, Number of Generating Facilities	4
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
Hydroelectric [Line Items]
Dam removal cost limit	184,000,000
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
Hydroelectric [Line Items]
Dam removal cost limit	16,000,000
Additional dam removal costs, California bond measure	$ 250,000,000

Commitments and Contingencies_4

Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Hydroelectric [Line Items]
Assets	$ 92,189	$ 90,208	$ 85,440
PacifiCorp [Member]
Hydroelectric [Line Items]
Assets	22,313	$ 21,920	$ 22,394	$ 22,367	$ 22,205
Capital expenditures required by hydroelectric licenses	155
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
Hydroelectric [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
Hydroelectric [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
Hydroelectric [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	250
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | VARIOUS [Domain]
Hydroelectric [Line Items]
Klamath Relicensing and Settlement Costs	$ 44

Commitments and Contingencies_5

Commitments and Contingencies - PacifiCorp - Commitments Tables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 197
Operating Leases, Future Minimum Payments, Due in Two Years	177
Operating Leases, Future Minimum Payments, Due in Three Years	160
Operating Leases, Future Minimum Payments, Due in Four Years	139
Operating Leases, Future Minimum Payments, Due in Five Years	111
Operating Leases, Future Minimum Payments, Due Thereafter	1,738
Operating Leases, Future Minimum Payments Due	2,522
Contractual Obligation, Due in Next Twelve Months	5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,330
Purchase Obligation, Due in Second Year	587
Purchase Obligation, Due in Third Year	52
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	2,969
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	2,829
PacifiCorp [Member]
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7
Operating Leases, Future Minimum Payments, Due in Two Years	6
Operating Leases, Future Minimum Payments, Due in Three Years	7
Operating Leases, Future Minimum Payments, Due in Four Years	6
Operating Leases, Future Minimum Payments, Due in Five Years	5
Operating Leases, Future Minimum Payments, Due Thereafter	90
Operating Leases, Future Minimum Payments Due	121
Contractual Obligation, Due in Next Twelve Months	2,117
Contractual Obligation, Due in Second Year	1,548
Contractual Obligation, Due in Third Year	839
Contractual Obligation, Due in Fourth Year	618
Contractual Obligation, Due in Fifth Year	538
Contractual Obligation, Due after Fifth Year	3,893
Contractual Obligation	9,553
Rent expense for power purchase agreements meeting definition of operating lease	$ 26	$ 14
Maximum percentage of energy sources for which a share of operating costs and debt service is required	5.00%	5.00%	5.00%
Operating leases, rent expense, net	$ 15	$ 15
PacifiCorp [Member] | Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	317
Purchase Obligation, Due in Second Year	194
Purchase Obligation, Due in Third Year	155
Purchase Obligation, Due in Fourth Year	152
Purchase Obligation, Due in Fifth Year	145
Purchase Obligation, Due after Fifth Year	1,522
Purchase Obligation	2,485
PacifiCorp [Member] | Purchased electricity contracts - not commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	13
Purchase Obligation, Due in Second Year	21
Purchase Obligation, Due in Third Year	48
Purchase Obligation, Due in Fourth Year	49
Purchase Obligation, Due in Fifth Year	49
Purchase Obligation, Due after Fifth Year	797
Purchase Obligation	977
PacifiCorp [Member] | Fuel contracts
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	732
Purchase Obligation, Due in Second Year	648
Purchase Obligation, Due in Third Year	521
Purchase Obligation, Due in Fourth Year	326
Purchase Obligation, Due in Fifth Year	268
Purchase Obligation, Due after Fifth Year	976
Purchase Obligation	3,471
PacifiCorp [Member] | Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	888
Purchase Obligation, Due in Second Year	559
Purchase Obligation, Due in Third Year	2
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	1,449
PacifiCorp [Member] | Transmission
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	108
Purchase Obligation, Due in Second Year	95
Purchase Obligation, Due in Third Year	80
Purchase Obligation, Due in Fourth Year	69
Purchase Obligation, Due in Fifth Year	63
Purchase Obligation, Due after Fifth Year	427
Purchase Obligation	842
PacifiCorp [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	52
Purchase Obligation, Due in Second Year	25
Purchase Obligation, Due in Third Year	26
Purchase Obligation, Due in Fourth Year	16
Purchase Obligation, Due in Fifth Year	8
Purchase Obligation, Due after Fifth Year	81
Purchase Obligation	$ 208

Commitments and Contingencies_6

Commitments and Contingencies - MEC - Commitments Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 197
Operating Leases, Future Minimum Payments, Due in Two Years	177
Operating Leases, Future Minimum Payments, Due in Three Years	160
Operating Leases, Future Minimum Payments, Due in Four Years	139
Operating Leases, Future Minimum Payments, Due in Five Years	111
Operating Leases, Future Minimum Payments, Due Thereafter	1,738
Operating Leases, Future Minimum Payments Due	2,522
Contractual Obligation, Due in Next Twelve Months	5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,330
Purchase Obligation, Due in Second Year	587
Purchase Obligation, Due in Third Year	52
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	2,969
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	2,829
MidAmerican Energy Company [Member]
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	27
Operating Leases, Future Minimum Payments, Due in Two Years	29
Operating Leases, Future Minimum Payments, Due in Three Years	29
Operating Leases, Future Minimum Payments, Due in Four Years	30
Operating Leases, Future Minimum Payments, Due in Five Years	30
Operating Leases, Future Minimum Payments, Due Thereafter	1,078
Operating Leases, Future Minimum Payments Due	1,223
Contractual Obligation, Due in Next Twelve Months	1,714
Contractual Obligation, Due in Second Year	378
Contractual Obligation, Due in Third Year	328
Contractual Obligation, Due in Fourth Year	246
Contractual Obligation, Due in Fifth Year	199
Contractual Obligation, Due after Fifth Year	1,368
Contractual Obligation	4,233
Operating leases, rent expense, net	3	$ 3	$ 4
MidAmerican Energy Company [Member] | Fuel contracts
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	96
Purchase Obligation, Due in Second Year	21
Purchase Obligation, Due in Third Year	17
Purchase Obligation, Due in Fourth Year	13
Purchase Obligation, Due in Fifth Year	5
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	152
MidAmerican Energy Company [Member] | Electric capacity and transmission
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	29
Purchase Obligation, Due in Second Year	28
Purchase Obligation, Due in Third Year	26
Purchase Obligation, Due in Fourth Year	15
Purchase Obligation, Due in Fifth Year	7
Purchase Obligation, Due after Fifth Year	36
Purchase Obligation	141
MidAmerican Energy Company [Member] | Natural gas contracts for gas operations
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	145
Purchase Obligation, Due in Second Year	76
Purchase Obligation, Due in Third Year	59
Purchase Obligation, Due in Fourth Year	45
Purchase Obligation, Due in Fifth Year	23
Purchase Obligation, Due after Fifth Year	30
Purchase Obligation	378
MidAmerican Energy Company [Member] | Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	1,299
Purchase Obligation, Due in Second Year	28
Purchase Obligation, Due in Third Year	50
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	1,377
MidAmerican Energy Company [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	118
Purchase Obligation, Due in Second Year	196
Purchase Obligation, Due in Third Year	147
Purchase Obligation, Due in Fourth Year	143
Purchase Obligation, Due in Fifth Year	134
Purchase Obligation, Due after Fifth Year	224
Purchase Obligation	$ 962

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 10
Electric Transmission [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity Adder, Percentage	0.50%
Electric Transmission [Member] | Prior to September 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
Electric Transmission [Member] | November 2013 to February 2015 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	10.32%
Public Utilities, Intervenor Proposed Return On Equity, Percentage	9.15%
Electric Transmission [Member] | February 2015 through May 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

Commitments and Contingencies_7

Commitments and Contingencies - NPC - Legal (Details) - Nevada Power Company [Member] - MW	12 Months Ended		36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
557 Megawatts of Coal Energy [Member]
Loss Contingencies [Line Items]
Coal-Fired Power Plant Capacity		557
255 Megawatts of Coal Energy [Member]
Loss Contingencies [Line Items]
Coal-Fired Power Plant Capacity	255
536 Megawatts of Renewable Energy [Member]
Loss Contingencies [Line Items]
New Generation Capacity			536
200 Megawatts of Solar Renewable Energy [Member]
Loss Contingencies [Line Items]
New Generation Capacity			200
15 Megawatts of Solar Renewable Energy [Member]
Loss Contingencies [Line Items]
New Generation Capacity			15
35 Megawatts of Renewable Energy [Member]
Loss Contingencies [Line Items]
New Generation Capacity	35

Commitments and Contingencies_8

Commitments and Contingencies - NPC - Commitments Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation [Line Items]
Contractual Obligation, Due in Next Twelve Months	$ 5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Fuel, capacity and transmission contract commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,215
Purchase Obligation, Due in Second Year	1,659
Purchase Obligation, Due in Third Year	1,380
Purchase Obligation, Due in Fourth Year	1,174
Purchase Obligation, Due in Fifth Year	1,047
Purchase Obligation, Due after Fifth Year	11,155
Purchase Obligation	18,630
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	2,829
Nevada Power Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Due in Next Twelve Months	668
Contractual Obligation, Due in Second Year	508
Contractual Obligation, Due in Third Year	436
Contractual Obligation, Due in Fourth Year	468
Contractual Obligation, Due in Fifth Year	456
Contractual Obligation, Due after Fifth Year	5,992
Contractual Obligation	8,528
Rent expense for power purchase agreements meeting definition of operating lease	271	$ 310	$ 302
Operating Lease and Easement, Expense	7	$ 9	$ 13
Nevada Power Company [Member] | Fuel, capacity and transmission contract commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	612
Purchase Obligation, Due in Second Year	459
Purchase Obligation, Due in Third Year	379
Purchase Obligation, Due in Fourth Year	383
Purchase Obligation, Due in Fifth Year	386
Purchase Obligation, Due after Fifth Year	4,925
Purchase Obligation	7,144
Nevada Power Company [Member] | Fuel, capacity and transmission contract commitments, Not commercially operable [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	0
Purchase Obligation, Due in Second Year	1
Purchase Obligation, Due in Third Year	6
Purchase Obligation, Due in Fourth Year	40
Purchase Obligation, Due in Fifth Year	40
Purchase Obligation, Due after Fifth Year	982
Purchase Obligation	1,069
Nevada Power Company [Member] | Operating Leases and easements [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	10
Purchase Obligation, Due in Second Year	7
Purchase Obligation, Due in Third Year	7
Purchase Obligation, Due in Fourth Year	8
Purchase Obligation, Due in Fifth Year	7
Purchase Obligation, Due after Fifth Year	59
Purchase Obligation	98
Nevada Power Company [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	46
Purchase Obligation, Due in Second Year	41
Purchase Obligation, Due in Third Year	44
Purchase Obligation, Due in Fourth Year	37
Purchase Obligation, Due in Fifth Year	23
Purchase Obligation, Due after Fifth Year	26
Purchase Obligation	$ 217

Commitments and Contingencies_9

Commitments and Contingencies - SPPC - Commitments Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation [Line Items]
Contractual Obligation, Due in Next Twelve Months	$ 5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Fuel, capacity and transmission contract commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,215
Purchase Obligation, Due in Second Year	1,659
Purchase Obligation, Due in Third Year	1,380
Purchase Obligation, Due in Fourth Year	1,174
Purchase Obligation, Due in Fifth Year	1,047
Purchase Obligation, Due after Fifth Year	11,155
Purchase Obligation	18,630
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	2,829
Sierra Pacific Power Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Due in Next Twelve Months	224
Contractual Obligation, Due in Second Year	181
Contractual Obligation, Due in Third Year	155
Contractual Obligation, Due in Fourth Year	148
Contractual Obligation, Due in Fifth Year	123
Contractual Obligation, Due after Fifth Year	1,953
Contractual Obligation	2,784
Rent expense for power purchase agreements meeting definition of operating lease	72	$ 74	$ 69
Operating Lease and Easement, Expense	4	$ 4	$ 6
Sierra Pacific Power Company [Member] | Fuel, capacity and transmission contract commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	204
Purchase Obligation, Due in Second Year	154
Purchase Obligation, Due in Third Year	117
Purchase Obligation, Due in Fourth Year	81
Purchase Obligation, Due in Fifth Year	61
Purchase Obligation, Due after Fifth Year	502
Purchase Obligation	1,119
Sierra Pacific Power Company [Member] | Fuel, capacity and transmission contract commitments, Not commercially operable [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	8
Purchase Obligation, Due in Second Year	16
Purchase Obligation, Due in Third Year	28
Purchase Obligation, Due in Fourth Year	58
Purchase Obligation, Due in Fifth Year	58
Purchase Obligation, Due after Fifth Year	1,394
Purchase Obligation	1,562
Sierra Pacific Power Company [Member] | Operating Leases, Easements, Maintenance and Service [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	4
Purchase Obligation, Due in Second Year	4
Purchase Obligation, Due in Third Year	4
Purchase Obligation, Due in Fourth Year	3
Purchase Obligation, Due in Fifth Year	2
Purchase Obligation, Due after Fifth Year	56
Purchase Obligation	73
Sierra Pacific Power Company [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	8
Purchase Obligation, Due in Second Year	7
Purchase Obligation, Due in Third Year	6
Purchase Obligation, Due in Fourth Year	6
Purchase Obligation, Due in Fifth Year	2
Purchase Obligation, Due after Fifth Year	1
Purchase Obligation	$ 30

Preferred Stock - PacifiCorp (D

Preferred Stock - PacifiCorp (Details) - PacifiCorp [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2018Payments$ / sharesshares	Dec. 31, 2017$ / sharesshares
Class of Stock [Line Items]
Number Of Full Quarterly Dividend Payments In Default Before Preferred Stockholders Elect Board Of Directors | Payments	4
Preferred Stock Class, 5 Percent Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	127	127
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Dividend Rate, Percentage	5.00%	5.00%
Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	3,500	3,500
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 100	$ 100
Preferred Stock, Shares Issued	24	24
Preferred Stock, Shares Outstanding	24	24
Preferred Stock Class, No Par Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	16,000	16,000
Shares Issued for Certain Class of Preferred Stock	0	0
Shares Outstanding for Certain Class of Preferred Stock	0	0
Minimum [Member] | Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	6.00%	6.00%
Maximum [Member] | Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	7.00%	7.00%

BHE Shareholders' Equity (Detai

BHE Shareholders' Equity (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 28, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
BHE junior subordinated debentures			$ 100	$ 100
Common stock, value, repurchased			$ 107	$ 19
Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchased (shares)			177,381	35,000
Common stock, value, repurchased			$ 107	$ 19
Subsequent Event [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchased (shares)	447,712
Common stock, value, repurchased	$ 293
Berkshire Hathaway Energy [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
Class of Stock [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Conversion of Stock, Shares Converted		181,819
BHE [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
Class of Stock [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.00%
Conversion of Stock, Shares Converted				181,819
Junior Subordinated Debt [Member] | Berkshire Hathaway Energy [Member]
Class of Stock [Line Items]
BHE junior subordinated debentures			100	$ 100
Junior Subordinated Debt [Member] | Berkshire Hathaway Energy [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
Class of Stock [Line Items]
BHE junior subordinated debentures			$ 100	$ 100
Debt Instrument, Interest Rate, Stated Percentage			5.00%	5.00%

BHE Shareholders' Equity - Rest

BHE Shareholders' Equity - Restricted Net Assets (Details) $ in Billions	Dec. 31, 2018USD ($)
Stockholders' Equity Note [Abstract]
BHE restricted net assets	$ 16.5
BHE's subsidiaries restricted net assets	$ 20.7

Common Shareholder's Equity - P

Common Shareholder's Equity - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Dividends, Common Stock, Cash	$ 450	$ 600	$ 875
Minimum Common Equity To Capitalization Percentage	44.00%
Actual common equity percentage as calculated in accordance with acquisition commitment	54.00%
Amount available for dividend distribution without prior approval	$ 2,600

Components of Accumulated Oth_3

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss, Net [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1,085
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(398)
Other comprehensive (loss) income, unrecognized amounts on retirement benefits	25	$ 64	$ (9)
Other comprehensive (loss) income, foreign currency translation adjustment	(494)	546	(583)
Other comprehensive (loss) income, unrealized gains on available-for-sale securities	0	500	(30)
Other comprehensive (loss) income, unrealized gains on cash flow hedges	7	3	19
Other comprehensive income (loss)	(462)	1,113	(603)
Ending balance	(1,945)	(398)
Accumulated Other Comprehensive Loss, Net [Member]
Accumulated Other Comprehensive Loss, Net [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(1,085)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, unrecognized amounts on retirement benefits	(383)	(447)	(438)
Balance, foreign currency translation adjustment	(1,129)	(1,675)	(1,092)
Beginning balance	1,085	585	615
Beginning balance	29	26	7
Beginning balance	(398)	(1,511)	(908)
Other comprehensive (loss) income, unrecognized amounts on retirement benefits	25	64	(9)
Other comprehensive (loss) income, foreign currency translation adjustment	(494)	546	(583)
Other comprehensive (loss) income, unrealized gains on available-for-sale securities	0	500	(30)
Other comprehensive (loss) income, unrealized gains on cash flow hedges	7	3	19
Other comprehensive income (loss)	(462)	1,113	(603)
Balance, unrecognized amounts on retirement benefits	(358)	(383)	(447)
Balance, foreign currency translation adjustment	(1,623)	(1,129)	(1,675)
Ending balance	0	1,085	585
Ending balance	36	29	26
Ending balance	$ (1,945)	$ (398)	$ (1,511)

Components of Accumulated Oth_4

Components of Accumulated Other Comprehensive Loss, Net - PacifiCorp (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
PacifiCorp [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ (13)	$ (15)

Components of Accumulated Oth_5

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of accumulated other comprehensive income (loss)
Beginning balance	$ (398)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	$ 500	$ (30)
Unrealized (losses) gains on cash flow hedges, net of tax	7	3	19
Other comprehensive income (loss), net of tax	(462)	1,113	(603)
Ending balance	(1,945)	(398)
MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	0	3
Dividend, Noncash, Transfer Of Operations	0	0	90
Other comprehensive income (loss), net of tax			3
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of accumulated other comprehensive income (loss)
Beginning balance	1,085	585	615
Beginning balance	29	26	7
Beginning balance	(398)	(1,511)	(908)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	500	(30)
Unrealized (losses) gains on cash flow hedges, net of tax	7	3	19
Other comprehensive income (loss), net of tax	(462)	1,113	(603)
Ending balance	0	1,085	585
Ending balance	36	29	26
Ending balance	$ (1,945)	(398)	(1,511)
Accumulated Other Comprehensive Income (Loss) [Member] | MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Beginning balance		0	(3)
Beginning balance		0	(27)
Beginning balance		$ 0	(30)
Unrealized gains (losses) on available-for-sale securities, net of tax			3
Unrealized (losses) gains on cash flow hedges, net of tax			0
Dividend, Noncash, Transfer Of Operations			27
Other comprehensive income (loss), net of tax			3
Ending balance			0
Ending balance			0
Ending balance			$ 0

Variable-Interest Entities - Pa

Variable-Interest Entities - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	66.67%
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	$ 100	$ 137
Jim Bridger Unit Nos 1 thru 4 [Member]
Schedule of Equity Method Investments [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	67.00%
Jim Bridger Unit Nos 1 thru 4 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	66.67%
Jointly Owned Utility Plant, Joint Owner Share	33.33%
Share of coal production purchased by Company	66.67%
Share of coal production purchased by joint venture partner	33.33%

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Berkshire Hathaway Energy [Member]
Preferred Securities of Subsidiaries [Line Items]
Preferred stock of subsidiaries, value, outstanding noncontrolling interest, amount represented by preferred stock	$ 58	$ 58
Northern Electric Plc [Member]
Preferred Securities of Subsidiaries [Line Items]
Preferred stock of subsidiaries, value, outstanding noncontrolling interest, amount represented by preferred stock	$ 56	$ 56
Noncontrolling interest, dividend requirements of preferred stock	0.08061	0.08061
PacifiCorp [Member]
Preferred Securities of Subsidiaries [Line Items]
Preferred stock of subsidiaries, value, outstanding noncontrolling interest, amount represented by preferred stock	$ 2	$ 2

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues		$ 19,787		$ 18,614	$ 17,422
Depreciation and amortization - energy operations		2,933		2,580	2,560
Depreciation and amortization		2,984		2,646	2,591
Operating income (loss)		4,072		4,522	4,247
Interest expense		1,838		1,841	1,854
Capitalized interest		(61)		(45)	(139)
Allowance for equity funds		104		76	158
Investment Income, Interest and Dividend		113		111	120
Gain (Loss) on Investments		(538)		14	10
Other, net		(9)		(420)	30
Income before income tax expense and equity income		1,965		2,507	2,850
Income tax (benefit) expense		(583)		(554)	403
Payments to Acquire Property, Plant, and Equipment		6,241		4,571	5,090
Property, plant and equipment, net		68,595		65,871	62,509
Assets		92,189		90,208	85,440
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Revenues		5,026		5,237	5,201
Depreciation and amortization - energy operations		979		796	783
Operating income (loss)		1,051		1,440	1,429
Interest expense		384		381	381
Income tax (benefit) expense		5		362	341
Payments to Acquire Property, Plant, and Equipment		1,257		769	903
Property, plant and equipment, net		19,591		19,203	19,162
Assets		23,478		23,086	23,563
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Revenues		3,053		2,846	2,631
Depreciation and amortization - energy operations		609		500	479
Operating income (loss)		550		544	551
Interest expense		247		237	218
Income tax (benefit) expense		(262)		(202)	(139)
Payments to Acquire Property, Plant, and Equipment		2,332		1,776	1,637
Property, plant and equipment, net		16,171		14,221	12,835
Assets		20,029		18,444	17,571
NV Energy [Member]
Segment Reporting Information [Line Items]
Revenues		3,039		3,015	2,895
Depreciation and amortization - energy operations		456		422	421
Operating income (loss)		607		766	774
Interest expense		224		233	250
Income tax (benefit) expense		100		221	200
Payments to Acquire Property, Plant, and Equipment		503		456	529
Property, plant and equipment, net		9,852		9,770	9,825
Assets		14,119		13,903	14,320
Northern Powergrid Holdings [Member]
Segment Reporting Information [Line Items]
Revenues		1,020		949	995
Depreciation and amortization - energy operations		250		214	200
Operating income (loss)		486		488	500
Interest expense		141		133	136
Income tax (benefit) expense		61		57	22
Payments to Acquire Property, Plant, and Equipment		566		579	579
Property, plant and equipment, net		6,007		6,075	5,148
Assets		7,427		7,565	6,433
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Revenues		1,203		993	978
Depreciation and amortization - energy operations		126		159	206
Operating income (loss)		525		473	455
Interest expense		43		43	50
Income tax (benefit) expense		119		170	163
Payments to Acquire Property, Plant, and Equipment		427		286	226
Property, plant and equipment, net		4,904		4,587	4,423
Assets		5,511		5,134	5,144
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Revenues		710		699	502
Depreciation and amortization - energy operations		247		239	241
Operating income (loss)		313		322	92
Interest expense		167		169	153
Income tax (benefit) expense		7		(124)	26
Payments to Acquire Property, Plant, and Equipment		270		334	466
Property, plant and equipment, net		5,824		6,330	5,810
Assets		8,424		9,009	8,378
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Revenues		908		838	743
Depreciation and amortization - energy operations		268		251	230
Operating income (loss)		325		316	256
Interest expense		201		204	198
Income tax (benefit) expense		(158)		(795)	(32)
Payments to Acquire Property, Plant, and Equipment		817		323	719
Property, plant and equipment, net		6,155		5,637	5,302
Assets		8,666		7,687	7,010
HomeServices [Member]
Segment Reporting Information [Line Items]
Revenues		4,214		3,443	2,801
Depreciation and amortization		51		66	31
Operating income (loss)		214		214	212
Interest expense		23		7	2
Income tax (benefit) expense		52		49	81
Payments to Acquire Property, Plant, and Equipment		47		37	20
Property, plant and equipment, net		141		117	78
Assets		2,797		2,722	1,776
Berkshire Hathaway Energy And Other [Member]
Segment Reporting Information [Line Items]
Revenues	[2]	614	[1]	594	676
Depreciation and amortization - energy operations	[2]	(2)		(1)	0
Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	[2]	1		(41)	(22)
Interest expense	[2]	408		434	466
Income tax (benefit) expense	[2]	(507)		(292)	(259)
Payments to Acquire Property, Plant, and Equipment		22		11	11
Property, plant and equipment, net		(50)		(69)	(74)
Assets		1,738		2,658	1,245
UNITED STATES
Segment Reporting Information [Line Items]
Revenues		18,014		16,916	15,895
Income before income tax expense and equity income		1,425		1,927	2,264
Property, plant and equipment, net		56,870		53,579	51,671
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues		1,017		948	995
Income before income tax expense and equity income		307		313	382
Property, plant and equipment, net		5,895		5,953	5,020
CANADA
Segment Reporting Information [Line Items]
Revenues		710		699	506
Income before income tax expense and equity income		155		167	135
Property, plant and equipment, net		5,817		6,323	5,803
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues		46		51	26
Income before income tax expense and equity income		78		100	69
Property, plant and equipment, net		$ 13		$ 16	$ 15
[1]	(1)The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations.
[2]	(1)The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other, relate to other corporate entities, including MidAmerican Energy Services, LLC, corporate functions and intersegment eliminations.

Segment Information - Goodwill

Segment Information - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 9,678	$ 9,010
Acquisitions	79	508
Foreign currency translation	(162)	162
Other		(2)
Ending balance	9,595	9,678
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129	1,129
Acquisitions	0	0
Foreign currency translation	0	0
Other		0
Ending balance	1,129	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102	2,102
Acquisitions	0	0
Foreign currency translation	0	0
Other		0
Ending balance	2,102	2,102
NV Energy [Member]
Goodwill [Roll Forward]
Beginning balance	2,369	2,369
Acquisitions	0	0
Foreign currency translation	0	0
Other		0
Ending balance	2,369	2,369
Northern Powergrid Holdings [Member]
Goodwill [Roll Forward]
Beginning balance	991	930
Acquisitions	0	0
Foreign currency translation	(39)	61
Other		0
Ending balance	952	991
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	73	75
Acquisitions	0	0
Foreign currency translation	0	0
Other		(2)
Ending balance	73	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,571	1,470
Acquisitions	0	0
Foreign currency translation	(123)	101
Other		0
Ending balance	1,448	1,571
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95	95
Acquisitions	0	0
Foreign currency translation	0	0
Other		0
Ending balance	95	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	1,348	840
Acquisitions	79	508
Foreign currency translation	0	0
Other		0
Ending balance	1,427	1,348
Other [Member]
Goodwill [Roll Forward]
Beginning balance	0	0
Acquisitions	0	0
Foreign currency translation	0	0
Other		0
Ending balance	$ 0	$ 0

Segment Information - MEC (Deta

Segment Information - MEC (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)OperatingSegmentsTheNumberOfReportableSegments	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | OperatingSegments									8
Revenues									$ 19,787	$ 18,614	$ 17,422
Operating income (loss)									4,072	4,522	4,247
Interest expense									1,838	1,841	1,854
Income tax (benefit) expense									(583)	(554)	403
Net income attributable to BHE shareholders									2,568	2,870	2,542
Payments to Acquire Property, Plant, and Equipment									6,241	4,571	5,090
Assets	$ 92,189				$ 90,208				$ 92,189	90,208	85,440
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of Reportable Segments | TheNumberOfReportableSegments									2
Revenues	754	$ 832	$ 717	$ 746	671	$ 813	$ 658	$ 695	$ 3,049	2,837	2,625
Utilities Operating Expense, Depreciation and Amortization									609	500	479
Operating income (loss)	107	278	87	79	27	284	130	102	551	543	550
Interest expense									227	214	196
Income tax (benefit) expense									(255)	(183)	(132)
Net income attributable to BHE shareholders	(13)	$ 483	$ 106	$ 106	(19)	$ 385	$ 134	$ 105	682	605	542
Payments to Acquire Property, Plant, and Equipment									2,332	1,773	1,636
Assets	17,920				16,318				17,920	16,318	15,459
MidAmerican Energy Company [Member] | Electricity, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									2,283	2,108	1,985
Utilities Operating Expense, Depreciation and Amortization									565	458	436
Operating income (loss)									469	472	486
Interest expense									208	196	178
Income tax (benefit) expense									(273)	(212)	(156)
Net income attributable to BHE shareholders									628	570	512
Payments to Acquire Property, Plant, and Equipment									2,223	1,686	1,564
Assets	16,511				14,914				16,511	14,914	14,113
MidAmerican Energy Company [Member] | Natural Gas, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									754	719	637
Utilities Operating Expense, Depreciation and Amortization									44	42	43
Operating income (loss)									81	72	64
Interest expense									19	18	18
Income tax (benefit) expense									16	29	22
Net income attributable to BHE shareholders									54	35	32
Payments to Acquire Property, Plant, and Equipment									109	87	72
Assets	1,406				1,403				1,406	1,403	1,345
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues									12	10	3
Operating income (loss)									1	(1)	0
Income tax (benefit) expense									2	0	2
Net income attributable to BHE shareholders									0	0	(2)
Assets	$ 3				$ 1				$ 3	$ 1	$ 1

Segment Information - MidAmeric

Segment Information - MidAmerican Funding (Details) $ in Millions	3 Months Ended							9 Months Ended	12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2018USD ($)OperatingSegmentsTheNumberOfReportableSegments	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | OperatingSegments									8
Revenues									$ 19,787	$ 18,614	$ 17,422
Operating income (loss)									4,072	4,522	4,247
Interest expense									1,838	1,841	1,854
Income tax (benefit) expense									(583)	(554)	403
Net income (loss) attributable to parent									2,568	2,870	2,542
Payments to Acquire Property, Plant, and Equipment									6,241	4,571	5,090
Assets	$ 92,189				$ 90,208				92,189	90,208	85,440
Goodwill	9,595				9,678				$ 9,595	9,678	9,010
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of Reportable Segments | TheNumberOfReportableSegments									2
Revenues	756	$ 832	$ 718	$ 747	676	$ 659	$ 696	$ 815	$ 3,053	2,846	2,631
Utilities Operating Expense, Depreciation and Amortization									609	500	479
Operating income (loss)	106	278	87	79	27	131	102	284	550	544	551
Interest expense									247	237	219
Income tax (benefit) expense									(262)	(202)	(139)
Net income (loss) attributable to parent	(16)	$ 479	$ 103	$ 103	(42)	$ 131	$ 102	$ 383	669	574	532
Payments to Acquire Property, Plant, and Equipment									2,332	1,773	1,636
Assets	19,202				17,621				19,202	17,621	16,747
Goodwill	1,270				1,270				1,270	1,270
MidAmerican Funding, LLC and Subsidiaries [Domain] | Electricity, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									2,283	2,108	1,985
Utilities Operating Expense, Depreciation and Amortization									565	458	436
Operating income (loss)									469	472	486
Interest expense									208	196	178
Income tax (benefit) expense									(273)	(212)	(156)
Net income (loss) attributable to parent									628	570	512
Payments to Acquire Property, Plant, and Equipment									2,223	1,686	1,564
Assets	17,702				16,105				17,702	16,105	15,304
Goodwill	1,191				1,191				1,191	1,191
MidAmerican Funding, LLC and Subsidiaries [Domain] | Natural Gas, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues									754	719	637
Utilities Operating Expense, Depreciation and Amortization									44	42	43
Operating income (loss)									81	72	64
Interest expense									19	18	18
Income tax (benefit) expense									16	29	22
Net income (loss) attributable to parent									54	35	32
Payments to Acquire Property, Plant, and Equipment									109	87	72
Assets	1,485				1,482				1,485	1,482	1,424
Goodwill	79				79				79	79
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues									16	19	9
Operating income (loss)									0	0	1
Interest expense									20	23	23
Income tax (benefit) expense									(5)	(19)	(5)
Net income (loss) attributable to parent									(13)	(31)	(12)
Assets	$ 15				$ 34				$ 15	$ 34	$ 19

Segment Information - SPPC (Det

Segment Information - SPPC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)OperatingSegmentsTheNumberOfReportableSegments	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | OperatingSegments	8
Revenues	$ 19,787	$ 18,614	$ 17,422
Operating income (loss)	4,072	4,522	4,247
Interest expense	1,838	1,841	1,854
Capitalized interest and allowance for borrowed funds	61	45	139
Allowance for equity funds	104	76	158
Other, net	(9)	(420)	30
Income before income tax expense and equity income	1,965	2,507	2,850
Assets	$ 92,189	90,208	85,440
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Number of Reportable Segments | TheNumberOfReportableSegments	2
Revenues	$ 855	812	812
Operating income (loss)	152	197	181
Interest expense	44	43	54
Capitalized interest and allowance for borrowed funds	1	2	4
Allowance for equity funds	4	3	(1)
Other, net	9	5	3
Income before income tax expense and equity income	122	164	133
Assets	3,569	3,413	3,493
Sierra Pacific Power Company [Member] | Electricity, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	752	713	702
Operating income (loss)	136	175	162
Assets	3,177	3,103	3,119
Sierra Pacific Power Company [Member] | Natural Gas, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	103	99	110
Operating income (loss)	16	22	19
Assets	314	300	314
Sierra Pacific Power Company [Member] | Regulated common assets [Member]
Segment Reporting Information [Line Items]
Assets	$ 78	$ 10	$ 60

Subsequent Events (MEC) Subsequ

Subsequent Events (MEC) Subsequent Events - MEC (Details) $ in Millions	Dec. 31, 2018USD ($)
Subsequent Event [Line Items]
Par value	$ 37,014
MidAmerican Energy Company [Member]
Subsequent Event [Line Items]
Par value	5,428
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Subsequent Event [Line Items]
Par value	$ 475

Unaudited Quarterly Operating_3

Unaudited Quarterly Operating Results - MEC (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Operating Results [Line Items]
Revenues									$ 19,787	$ 18,614	$ 17,422
Operating income (loss)									4,072	4,522	4,247
Net income attributable to BHE shareholders									2,568	2,870	2,542
MidAmerican Energy Company [Member]
Quarterly Operating Results [Line Items]
Revenues	$ 754	$ 832	$ 717	$ 746	$ 671	$ 813	$ 658	$ 695	3,049	2,837	2,625
Operating income (loss)	107	278	87	79	27	284	130	102	551	543	550
Net income attributable to BHE shareholders	$ (13)	$ 483	$ 106	$ 106	$ (19)	$ 385	$ 134	$ 105	$ 682	$ 605	$ 542

Unaudited Quarterly Operating_4

Unaudited Quarterly Operating Results - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Operating Results [Line Items]
Revenues									$ 19,787	$ 18,614	$ 17,422
Operating income (loss)									4,072	4,522	4,247
Net income attributable to BHE shareholders									2,568	2,870	2,542
MidAmerican Funding, LLC and Subsidiaries [Domain]
Quarterly Operating Results [Line Items]
Revenues	$ 756	$ 832	$ 718	$ 747	$ 676	$ 659	$ 696	$ 815	3,053	2,846	2,631
Operating income (loss)	106	278	87	79	27	131	102	284	550	544	551
Net income attributable to BHE shareholders	$ (16)	$ 479	$ 103	$ 103	$ (42)	$ 131	$ 102	$ 383	$ 669	$ 574	$ 532

Unaudited Quarterly Operating_5

Unaudited Quarterly Operating Results - NPC (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Operating Results [Line Items]
Operating income (loss)									$ 4,072	$ 4,522	$ 4,247
Net income attributable to BHE shareholders									2,568	2,870	2,542
Nevada Power Company [Member]
Quarterly Operating Results [Line Items]
Electric Domestic Operating Revenue, Quarterly	$ 407	$ 820	$ 562	$ 395	$ 421	$ 819	$ 574	$ 392
Operating income (loss)	37	247	122	40	37	317	157	52	446	565	583
Net income attributable to BHE shareholders	$ (2)	$ 164	$ 64	$ 0	$ (8)	$ 176	$ 77	$ 10	$ 226	$ 255	$ 279

Unaudited Quarterly Operating_6

Unaudited Quarterly Operating Results - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	3 Months Ended							9 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017
Quarterly Operating Results [Line Items]
Electric Domestic Operating Revenue, Quarterly	$ 177	$ 225	$ 169	$ 181	$ 179	$ 160	$ 159	$ 215
Gas Domestic Operating Revenue, Quarterly	29	14	19	41	33	17	34	15
Operating Income (loss), Quarterly	30	56	19	47	41	36	46	75
Net Income (Loss) Attributable to Parent, Quarterly	$ 16	$ 35	$ 7	$ 34	$ 24	$ 17	$ 24	$ 44

Schedule I Condensed Balance _2

Schedule I Condensed Balance Sheets (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 627	$ 935
Accounts receivable		2,038	2,014
Income tax receivable		90	334
Other current assets		853	815
Total current assets		5,147	5,778
Goodwill		9,595	9,678	$ 9,010
Other assets		1,053	1,248
Total assets		92,189	90,208	85,440
Current liabilities:
Short-term debt	[1]	2,516	4,488
Total current liabilities		8,770	11,603
BHE senior debt		8,577	5,452
BHE junior subordinated debentures		100	100
Long-term Debt		36,774	35,193
Other long-term liabilities		2,635	2,984
Total liabilities		62,466	61,900
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		6,371	6,368
Long-term income tax receivable		(457)	0
Retained earnings		25,624	22,206
Accumulated other comprehensive loss, net		(1,945)	(398)
Total shareholders' equity		29,593	28,176
Noncontrolling interest		130	132
Total equity		29,723	28,308	24,463	$ 22,535
Total liabilities and equity		92,189	90,208
Parent Company [Member]
Current assets:
Cash and cash equivalents		9	346	33	23
Accounts Receivable, Related Parties		100	60
Due from Affiliates		156	391
Income tax receivable		103	0
Other current assets		15	21
Total current assets		383	818
Investments in subsidiaries		36,602	34,019
Other Investments		1,579	2,117
Goodwill		1,221	1,221
Other assets		546	1,155
Total assets		40,331	39,330
Current liabilities:
Accounts payable and other current liabilities		183	268
Notes Payable, Related Parties, Current		328	182
Short-term debt		983	3,331
Current portion of senior debt		0	1,000
Total current liabilities		1,494	4,781
BHE senior debt		8,577	5,452
BHE junior subordinated debentures		100	100
Notes payable - affiliate		1	1
Other long-term liabilities		543	800
Total liabilities		10,715	11,134
Shareholders' equity:
Common stock		0	0
Additional paid-in capital		6,371	6,368
Retained earnings		25,624	22,206
Accumulated other comprehensive loss, net		(1,945)	(398)
Total shareholders' equity		29,593	28,176
Noncontrolling interest		23	20
Total equity		29,616	28,196
Total liabilities and equity		40,331	39,330
MidAmerican Funding LLC [Member]
Current assets:
Cash and cash equivalents		0	0	$ 0	$ 0
Due from Affiliates		2	2
Income tax receivable		0	13
Total current assets		2	15
Investments in subsidiaries		8,002	7,322
Total assets		8,004	7,337
Current liabilities:
Other accrued current liabilities		6	6
Long-term Debt		240	240
Notes payable - affiliate		429	431
Total liabilities		675	677
Shareholders' equity:
Paid-in capital		1,679	1,679
Retained earnings		5,650	4,981
Total shareholders' equity		7,329	6,660
Total liabilities and equity		$ 8,004	$ 7,337
[1]	(1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.

Schedule I Condensed Statements

Schedule I Condensed Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating costs and expenses:
Depreciation and amortization	$ 2,984	$ 2,646	$ 2,591
Total operating costs and expenses	15,715	14,092	13,175
Operating loss	4,072	4,522	4,247
Other income (expense):
Interest expense	(1,838)	(1,841)	(1,854)
Other, net	(9)	(420)	30
Total other income (expense)	(2,107)	(2,015)	(1,397)
Loss before income tax benefit and equity income	1,965	2,507	2,850
Income tax (benefit) expense	(583)	(554)	403
Equity income (loss)	43	(151)	123
Net income	2,591	2,910	2,570
Net income attributable to noncontrolling interests	23	40	28
Net income (loss) attributable to parent	2,568	2,870	2,542
Parent Company [Member]
Operating costs and expenses:
General and administration	21	55	51
Depreciation and amortization	4	4	4
Total operating costs and expenses	25	59	55
Operating loss	(25)	(59)	(55)
Other income (expense):
Interest expense	(438)	(475)	(527)
Other, net	(537)	(369)	37
Total other income (expense)	(975)	(844)	(490)
Loss before income tax benefit and equity income	(1,000)	(903)	(545)
Income tax (benefit) expense	(513)	(335)	(285)
Equity income (loss)	3,058	3,441	2,805
Net income	2,571	2,873	2,545
Net income attributable to noncontrolling interests	3	3	3
Net income (loss) attributable to parent	2,568	2,870	2,542
MidAmerican Funding LLC [Member]
Other income (expense):
Other, net	0	(30)	0
Interest Expense, Long-term Debt	(16)	(22)	(22)
Loss before income tax benefit and equity income	(16)	(52)	(22)
Income tax (benefit) expense	(5)	(22)	(9)
Equity income (loss)	680	604	545
Net income (loss) attributable to parent	$ 669	$ 574	$ 532

Schedule I Condensed Statemen_2

Schedule I Condensed Statements of Comprehensive Income Schedule I Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net income attributable to BHE shareholders	$ 2,568	$ 2,870	$ 2,542
Net income	2,591	2,910	2,570
Other comprehensive income (loss), net of tax	(462)	1,113	(603)
Comprehensive income	2,129	4,023	1,967
Comprehensive income attributable to noncontrolling interests	23	40	28
Comprehensive income attributable to BHE shareholders	2,106	3,983	1,939
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income attributable to BHE shareholders	2,568	2,870	2,542
Net income	2,571	2,873	2,545
Other comprehensive income (loss), net of tax	(462)	1,113	(603)
Comprehensive income	2,109	3,986	1,942
Comprehensive income attributable to noncontrolling interests	3	3	3
Comprehensive income attributable to BHE shareholders	2,106	3,983	1,939
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Net income attributable to BHE shareholders	669	574	532
Other comprehensive income (loss), net of tax	0	0	3
Comprehensive income attributable to BHE shareholders	$ 669	$ 574	$ 535

Schedule I Condensed Statemen_3

Schedule I Condensed Statements of Cash Flows Schedule I Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 6,770	$ 6,078	$ 6,104
Cash flows from investing activities:
Purchases of marketable securities	(329)	(190)	(141)
Proceeds from sale of investments	287	202	191
Other, net	83	(12)	(34)
Net cash flows from investing activities	(6,989)	(6,079)	(5,736)
Cash flows from financing activities:
Proceeds from BHE senior debt	3,166	0	0
Payment for Debt Extinguishment or Debt Prepayment Cost	0	(435)	0
Payments for Repurchase of Common Stock	107	19	0
Net proceeds from (repayments of) short-term debt	(1,946)	2,361	879
Other, net	(41)	(73)	(65)
Net cash flows from financing activities	(174)	274	(690)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	935
Cash and cash equivalents and restricted cash and cash equivalents at end of period	627	935
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	1,885	2,450	2,760
Cash flows from investing activities:
Investments in subsidiaries	(1,791)	(1,566)	(1,080)
Purchases of marketable securities	(44)	(71)	(24)
Proceeds from sale of investments	45	68	20
Notes receivable from affiliate, net	(72)	(305)	(307)
Other, net	(22)	(8)	(5)
Net cash flows from investing activities	(1,884)	(1,882)	(1,396)
Cash flows from financing activities:
Proceeds from BHE senior debt	3,166	0	0
Repayments of BHE senior debt	(1,045)	(1,379)	0
Repayments of BHE subordinated debt	0	(944)	(2,000)
Payment for Debt Extinguishment or Debt Prepayment Cost	0	(406)	0
Payments for Repurchase of Common Stock	107	19	0
Net proceeds from (repayments of) short-term debt	(2,348)	2,498	581
Notes payable to affiliate, net	0	0	69
Other, net	(4)	(5)	(4)
Net cash flows from financing activities	(338)	(255)	(1,354)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(337)	313	10
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	346	33	23
Cash and cash equivalents and restricted cash and cash equivalents at end of period	9	346	33
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	2	(15)	(13)
Cash flows from investing activities:
Net cash flows from investing activities	0	0	0
Cash flows from financing activities:
Repayments of Long-term Debt	0	(86)	0
Payment for Debt Extinguishment or Debt Prepayment Cost	0	(29)	0
Net change in amounts payable to subsidiary	(2)	130	13
Net cash flows from financing activities	(2)	15	13
Net change in cash and cash equivalents and restricted cash and cash equivalents	0	0	0
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 0	$ 0	$ 0

Condensed Financial Statement_2

Condensed Financial Statements - Other Investments (Details) - BYD Company Limited common stock [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Available-for-sale Securities, Equity Securities	$ 1,435	$ 1,961
Parent Company [Member]
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Available-for-sale Securities, Equity Securities	1,435	1,961
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	$ 1,203	$ 1,729

Condensed Financial Statement_3

Condensed Financial Statements - Dividends and Distributions (Details) - Parent Company [Member] - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Feb. 22, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Distribution [Line Items]
Proceeds from dividends received		$ 2,300	$ 3,000	$ 3,000
Subsequent Event [Member]
Distribution [Line Items]
Proceeds from dividends received	$ 194

Condensed Financial Statement_4

Condensed Financial Statements - Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Tax Equity Contributions	$ 698	$ 403	$ 584
Parent Company [Member]
Debt Instrument [Line Items]
Guarantor obligations, related party disclosure	297
Tax Equity Contributions	$ 1,383

Schedule I Condensed Financial

Schedule I Condensed Financial Statements Condensed Financial Statements - MidAmerican Funding - Payable to Affiliate (Details) - MidAmerican Funding LLC [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net change in amounts payable to subsidiary	$ (2)	$ 130	$ 13
MHC, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net change in amounts payable to subsidiary	$ (2)	$ 130	$ 13

Schedule II Consolidated Valu_2

Schedule II Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 40	$ 33	$ 31
Valuation Allowances and Reserves, Charged to Cost and Expense		43	42	39
Valuation Allowances and Reserves, Adjustments		0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		(41)	(35)	(37)
Balance at End of Year		42	40	33
Reserves not deducted from assets [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	[1]	13	13	13
Valuation Allowances and Reserves, Charged to Cost and Expense	[1]	6	7	5
Valuation Allowances and Reserves, Adjustments	[1]	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	(6)	(7)	(5)
Balance at End of Year	[1]	$ 13	$ 13	$ 13
[1]	serves not deducted from assets relate primarily to estimated liabilities for losses retained by BHE for workers compensation, public liability and property damage claims.

Schedule II Consolidated Valu_3

Schedule II Consolidated Valuation and Qualifying Accounts - MEC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 40	$ 33	$ 31
Valuation Allowances and Reserves, Charged to Cost and Expense		43	42	39
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		(41)	(35)	(37)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		40	33	31	$ 42
Reserves not deducted from assets [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	[1]	13	13	13
Valuation Allowances and Reserves, Charged to Cost and Expense	[1]	6	7	5
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	(6)	(7)	(5)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	[1]	13	13	13	13
MidAmerican Energy Company [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		7	7	6
Valuation Allowances and Reserves, Charged to Cost and Expense		8	8	7
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		(8)	(8)	(6)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		7	7	6	7
MidAmerican Energy Company [Member] | Reserves not deducted from assets [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		13	13	13
Valuation Allowances and Reserves, Charged to Cost and Expense		6	7	5
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		(6)	(7)	(5)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 13	$ 13	$ 13	$ 13
[1]	serves not deducted from assets relate primarily to estimated liabilities for losses retained by BHE for workers compensation, public liability and property damage claims.

Schedule II Consolidated Valu_4

Schedule II Consolidated Valuation and Qualifying Accounts Schedule II Consolidated Valuation and Qualifying Accounts - LLC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 42	$ 40	$ 33	$ 31
Valuation Allowances and Reserves, Charged to Cost and Expense		43	42	39
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		41	35	37
Reserves not deducted from assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	[1]	13	13	13	13
Valuation Allowances and Reserves, Charged to Cost and Expense	[1]	6	7	5
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	6	7	5
MidAmerican Funding, LLC and Subsidiaries [Domain] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		7	7	7	6
Valuation Allowances and Reserves, Charged to Cost and Expense		8	8	7
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		8	8	6
MidAmerican Funding, LLC and Subsidiaries [Domain] | Reserves not deducted from assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		13	13	13	$ 13
Valuation Allowances and Reserves, Charged to Cost and Expense		6	7	5
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		$ 6	$ 7	$ 5
[1]	serves not deducted from assets relate primarily to estimated liabilities for losses retained by BHE for workers compensation, public liability and property damage claims.

Revenue from Contract with Cu_3

Revenue from Contract with Customer Revenue from Contract with Customer (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787		$ 18,614	$ 17,422
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,890
Revenues		5,026		5,237	5,201
MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,032
Revenues		3,053		2,846	2,631
NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,011
Revenues		3,039
Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		931
Revenues		1,020		949	995
BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,232
Revenues		1,203
BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		710
Revenues		710		699	502
BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		673
Revenues		908
Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	493
Revenues	[2]	614	[1]	594	676
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		13,612
Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,890
Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,018
Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,011
Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		892
Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,232
Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		700
Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	(131)
Other customer revenue [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2
Other customer revenue [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2
Other customer revenue [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Other customer revenue [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	0
Nonregulated products and services [Member] | Nonregulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,360
Nonregulated products and services [Member] | Nonregulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Nonregulated products and services [Member] | Nonregulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		14
Nonregulated products and services [Member] | Nonregulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Nonregulated products and services [Member] | Nonregulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		39
Nonregulated products and services [Member] | Nonregulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Nonregulated products and services [Member] | Nonregulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		10
Nonregulated products and services [Member] | Nonregulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		673
Nonregulated products and services [Member] | Nonregulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	624
Regulated interstate pipeline [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,107
Regulated interstate pipeline [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,232
Regulated interstate pipeline [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated interstate pipeline [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	(125)
Regulated transmission and distribution [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,846
Regulated transmission and distribution [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		103
Regulated transmission and distribution [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		56
Regulated transmission and distribution [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		96
Regulated transmission and distribution [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		892
Regulated transmission and distribution [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated transmission and distribution [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		700
Regulated transmission and distribution [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated transmission and distribution [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	(1)
Regulated wholesale [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		501
Regulated wholesale [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		55
Regulated wholesale [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		411
Regulated wholesale [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		39
Regulated wholesale [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated wholesale [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated wholesale [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated wholesale [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated wholesale [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	(4)
Regulated retail gas [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		737
Regulated retail gas [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail gas [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		636
Regulated retail gas [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		101
Regulated retail gas [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail gas [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail gas [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail gas [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail gas [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	0
Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		9,419
Regulated retail electric [Member] | Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,732
Regulated retail electric [Member] | Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,915
Regulated retail electric [Member] | Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,773
Regulated retail electric [Member] | Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail electric [Member] | Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail electric [Member] | Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail electric [Member] | Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0
Regulated retail electric [Member] | Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	(1)
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	601
Non-contracts with customer revenue [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	136
Non-contracts with customer revenue [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	21
Non-contracts with customer revenue [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	28
Non-contracts with customer revenue [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	89
Non-contracts with customer revenue [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	(29)
Non-contracts with customer revenue [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	0
Non-contracts with customer revenue [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenues	[3]	235
Non-contracts with customer revenue [Member] | Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	[1],[3]	121
Electricity and natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenues		15,573		15,171	14,621
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenues		2,184		2,206	2,083
Unbilled Contracts Receivable		106		111
Nevada Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,160
Nevada Power Company [Member] | Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,107
Nevada Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		24
Nevada Power Company [Member] | Regulated wholesale, transmission and other [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		53
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenues		5,026		5,237	$ 5,201	$ 5,232	$ 5,252
Unbilled Contracts Receivable		229		$ 255
PacifiCorp [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,890
PacifiCorp [Member] | Other customer revenue [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		76
PacifiCorp [Member] | Regulated transmission and distribution [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		103
PacifiCorp [Member] | Regulated wholesale [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		55
PacifiCorp [Member] | Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,656
PacifiCorp [Member] | Regulated retail electric [Member] | Regulated Operation [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,737
PacifiCorp [Member] | Regulated retail electric [Member] | Regulated Operation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,513
PacifiCorp [Member] | Regulated retail electric [Member] | Regulated Operation [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,172
PacifiCorp [Member] | Regulated retail electric [Member] | Regulated Operation [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		234
PacifiCorp [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		$ 136
[1]	(1)The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations.
[2]	(1)The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other, relate to other corporate entities, including MidAmerican Energy Services, LLC, corporate functions and intersegment eliminations.
[3]	(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with Cu_4

Revenue from Contract with Customer Revenue from Contracts with Customers - Real Estate Services (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787	$ 18,614	$ 17,422
Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Revenues		4,214	3,443	2,801
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	[1]	601
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Revenues		4,214	$ 3,443	$ 2,801
HomeServices [Member] | Residential real estate brokerage [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,882
HomeServices [Member] | Real estate franchise [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		67
HomeServices [Member] | Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,949
Revenues		4,214
HomeServices [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		$ 265
[1]	(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with Cu_5

Revenue from Contract with Customer Revenue from Contracts with Customers - Remaining Performance Obligation (Details) - BHE Pipeline Group [Member] $ in Millions	Dec. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 842
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	5,678
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 6,520

Revenue from Contract with Cu_6

Revenue from Contract with Customer Revenue from Contract with Customer - NPC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787	$ 18,614	$ 17,422
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		13,612
Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		9,419
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	[1]	601
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenues		2,184	$ 2,206	$ 2,083
Nevada Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,160
Nevada Power Company [Member] | Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,107
Nevada Power Company [Member] | Regulated wholesale, transmission and other [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		53
Nevada Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		$ 24
[1]	(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with Cu_7

Revenue from Contract with Customer Revenue from Contract with Customer - SPPC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787	$ 18,614	$ 17,422
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	[1]	601
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		13,612
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		9,419
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		737
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenues		855	$ 812	$ 812
Sierra Pacific Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		6
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues		752
Sierra Pacific Power Company [Member] | Electric Operations [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		4
Sierra Pacific Power Company [Member] | Regulated Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues		103
Sierra Pacific Power Company [Member] | Regulated Gas [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		2
Sierra Pacific Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		849
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		48
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		748
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		48
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		101
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Gas [Member] | Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 0
[1]	(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with Cu_8

Revenue from Contract with Customer Revenue from Contract with Customer PAC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787	$ 18,614	$ 17,422
Non-contracts with customer revenue [Member]
Revenue from External Customer [Line Items]
Revenues	[1]	601
PacifiCorp [Member]
Revenue from External Customer [Line Items]
Revenues		5,026	$ 5,237	$ 5,201	$ 5,232	$ 5,252
PacifiCorp [Member] | Non-contracts with customer revenue [Member]
Revenue from External Customer [Line Items]
Revenues		136
Regulated Operation [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		13,612
Regulated Operation [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		9,419
Regulated Operation [Member] | Regulated wholesale [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		501
Regulated Operation [Member] | Regulated transmission and distribution [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,846
Regulated Operation [Member] | Other customer revenue [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2
Regulated Operation [Member] | PacifiCorp [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,890
Regulated Operation [Member] | PacifiCorp [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,656
Regulated Operation [Member] | PacifiCorp [Member] | Regulated wholesale [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		55
Regulated Operation [Member] | PacifiCorp [Member] | Regulated transmission and distribution [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		103
Regulated Operation [Member] | PacifiCorp [Member] | Other customer revenue [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		76
Regulated Operation [Member] | PacifiCorp [Member] | Residential [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,737
Regulated Operation [Member] | PacifiCorp [Member] | Commercial [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,513
Regulated Operation [Member] | PacifiCorp [Member] | Industrial [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,172
Regulated Operation [Member] | PacifiCorp [Member] | Other [Member] | Regulated retail electric [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 234
[1]	(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with Cu_9

Revenue from Contract with Customer Revenue from Contract with Customer - MEC (Details) - USD ($) $ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

$ 14,972

Revenues

19,787

$ 18,614

$ 17,422

Non-contracts with customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenues

[1]

601

MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

3,028

Revenues

$ 754

$ 832

$ 717

$ 746

$ 671

$ 813

$ 658

$ 695

3,049

2,837

2,625

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

2,551

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Residential [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

1,117

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Commercial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

467

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Industrial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

780

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

39

MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Other [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

148

MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

411

MidAmerican Energy Company and Subsidiaries [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

55

MidAmerican Energy Company and Subsidiaries [Member] | Other customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

11

MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenues

21

Regulated Operation [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

13,612

Regulated Operation [Member] | Regulated retail electric [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

9,419

Regulated Operation [Member] | Regulated retail gas [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

737

Regulated Operation [Member] | Regulated wholesale [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

501

Regulated Operation [Member] | Other customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

2

Electricity, US Regulated [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenues

2,283

2,108

1,985

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

2,265

Revenues

2,283

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

1,915

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Residential [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

696

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Commercial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

314

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Industrial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

758

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Other [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

147

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

295

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

55

Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenues

18

Natural Gas, US Regulated [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenues

754

719

637

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

752

Revenues

754

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

636

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Residential [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

421

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Commercial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

153

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Industrial [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

22

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

39

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Other [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

1

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

116

Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenues

2

Corporate and Other [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenues

12

$ 10

$ 3

Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

11

Revenues

12

Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Other customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

11

Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]

Disaggregation of Revenue [Line Items]

Revenues

$ 1

[1]

(2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Revenue from Contract with C_10

Revenue from Contract with Customer Revenue from Contract with Customer - LLC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 14,972
Nonregulated Operation [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,360
Nonregulated Operation [Member] | Corporate and Other [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4

Cash and Cash Equivalents and R

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplmental Cash Flow Disclosures (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 627	$ 935
Restricted Cash and Cash Equivalents, Current	227	327
Restricted Cash and Cash Equivalents, Noncurrent	29	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 883	$ 1,283	$ 1,003	$ 1,332

Uncategorized Items - bhe-20181

Label	Element	Value
Sierra Pacific Power Company [Member] | Distribution only service [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	$ 4,000,000
Sierra Pacific Power Company [Member] | Fully bundled and distribution services only customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	801,000,000
Sierra Pacific Power Company [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	797,000,000
Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Distribution only service [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	0
Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled and distribution services only customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	101,000,000
Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	101,000,000
Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Distribution only service [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	4,000,000
Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled and distribution services only customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	700,000,000
Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	696,000,000
Nevada Power Company [Member] | Regulated retail electric [Member] | Distribution only service [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	30,000,000
Nevada Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	2,077,000,000
Residential [Member] | Sierra Pacific Power Company [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	334,000,000
Residential [Member] | Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	67,000,000
Residential [Member] | Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	267,000,000
Residential [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	1,195,000,000
Commercial [Member] | Sierra Pacific Power Company [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	271,000,000
Commercial [Member] | Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	25,000,000
Commercial [Member] | Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	246,000,000
Commercial [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	433,000,000
Other [Member] | Sierra Pacific Power Company [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	7,000,000
Other [Member] | Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	1,000,000
Other [Member] | Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	6,000,000
Other [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	24,000,000
Industrial [Member] | Sierra Pacific Power Company [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	185,000,000
Industrial [Member] | Sierra Pacific Power Company [Member] | Regulated retail gas [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	8,000,000
Industrial [Member] | Sierra Pacific Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member] | Regulated Electric [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	177,000,000
Industrial [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Fully bundled customer [Member] | Regulated Operation [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax	$ 425,000,000