Sierra Pacific Power 10-Q 7 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
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		77,025,044
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
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
MidAmerican Energy Company [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
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
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

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,644	$ 935
Restricted cash and cash equivalents	212	327
Trade receivables, net	1,772	2,014
Income taxes receivable	458	334
Inventories	864	888
Mortgage loans held for sale	440	465
Other current assets	963	815
Total current assets	6,353	5,778
Property, plant and equipment, net	66,054	65,871
Goodwill	9,665	9,678
Regulatory assets	2,812	2,761
Investments and restricted cash and cash equivalents and investments	4,796	4,872
Other assets	1,232	1,248
Total assets	90,912	90,208
Current liabilities:
Accounts payable	1,089	1,519
Accrued interest	507	488
Accrued property, income and other taxes	446	354
Accrued employee expenses	319	274
Short-term debt	2,608	4,488
Current portion of long-term debt	4,314	3,431
Other current liabilities	1,209	1,049
Total current liabilities	10,492	11,603
BHE senior debt	7,627	5,452
BHE junior subordinated debentures	100	100
Subsidiary debt	25,457	26,210
Regulatory liabilities	7,368	7,309
Deferred income taxes	8,086	8,242
Other long-term liabilities	2,988	2,984
Total liabilities	62,118	61,900
Commitments and contingencies
BHE shareholders' equity:
Common stock - 115 shares authorized, no par value, 77 shares issued and outstanding	0	0
Additional paid-in capital	6,363	6,368
Retained earnings	23,719	22,206
Accumulated other comprehensive loss, net	(1,415)	(398)
Total BHE shareholders' equity	28,667	28,176
Noncontrolling interests	127	132
Total equity	28,794	28,308
Total liabilities and equity	$ 90,912	$ 90,208

Consolidated Balance Sheets - P

Consolidated Balance Sheets - PacifiCorp - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,644	$ 935
Income taxes receivable	458	334
Inventories	864	888
Other current assets	963	815
Total current assets	6,353	5,778
Regulatory assets	2,812	2,761
Other assets	1,232	1,248
Total assets	90,912	90,208
Current liabilities:
Accounts payable	1,089	1,519
Accrued employee expenses	319	274
Accrued interest	507	488
Accrued property, income and other taxes	446	354
Short-term debt	2,608	4,488
Other current liabilities	1,209	1,049
Total current liabilities	10,492	11,603
Deferred income taxes	8,086	8,242
Regulatory liabilities	7,368	7,309
Other long-term liabilities	2,988	2,984
Total liabilities	62,118	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,363	6,368
Retained earnings	23,719	22,206
Accumulated other comprehensive loss, net	(1,415)	(398)
Total BHE shareholders' equity	28,667	28,176
Total liabilities and equity	90,912	90,208
PacifiCorp [Member]
Current assets:
Cash and cash equivalents	17	14
Receivables, net	630	684
Income taxes receivable	17	59
Inventories	445	433
Regulatory assets	34	31
Prepaid expenses	66	73
Other current assets	28	21
Total current assets	1,237	1,315
Property, plant and equipment, net	19,190	19,203
Regulatory assets	1,068	1,030
Other assets	330	372
Total assets	21,825	21,920
Current liabilities:
Accounts payable	376	453
Income taxes payable	10	0
Accrued employee expenses	112	70
Accrued interest	106	115
Accrued property, income and other taxes	96	66
Short-term debt	124	80
Current portion of long-term debt	851	588
Regulatory liabilities	80	75
Other current liabilities	178	170
Total current liabilities	1,933	1,617
Long-term debt	6,087	6,437
Deferred income taxes	2,565	2,582
Regulatory liabilities	3,055	2,996
Other long-term liabilities	732	733
Total liabilities	14,372	14,365
Equity:
Preferred Stock, Value, Issued	2	2
Common stock	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	2,987	3,089
Accumulated other comprehensive loss, net	(15)	(15)
Total BHE shareholders' equity	7,453	7,555
Total liabilities and equity	$ 21,825	$ 21,920

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - PacifiCorp - $ / shares shares in Millions	Mar. 31, 2018	Dec. 31, 2017
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77
PacifiCorp [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	750	750
Common stock, shares issued	357	357
Common stock, shares outstanding	357	357

Balance Sheets - MEC

Balance Sheets - MEC - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,644	$ 935
Income taxes receivable	458	334
Inventories	864	888
Other current assets	963	815
Total current assets	6,353	5,778
Regulatory assets	2,812	2,761
Investments and restricted cash and cash equivalents and investments	4,796	4,872
Other assets	1,232	1,248
Total assets	90,912	90,208
Current liabilities:
Accounts payable	1,089	1,519
Accrued interest	507	488
Accrued property, income and other taxes	446	354
Short-term debt	2,608	4,488
Other current liabilities	1,209	1,049
Total current liabilities	10,492	11,603
Deferred income taxes	8,086	8,242
Regulatory liabilities	7,368	7,309
Other long-term liabilities	2,988	2,984
Total liabilities	62,118	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,363	6,368
Retained earnings	23,719	22,206
Accumulated other comprehensive loss, net	(1,415)	(398)
Total BHE shareholders' equity	28,667	28,176
Total liabilities and equity	90,912	90,208
MidAmerican Energy Company [Member]
Current assets:
Cash and cash equivalents	380	172
Receivables, net	319	344
Income taxes receivable	119	51
Inventories	208	245
Other current assets	138	134
Total current assets	1,164	946
Property, plant and equipment, net	14,268	14,207
Regulatory assets	209	204
Investments and restricted cash and cash equivalents and investments	723	728
Other assets	216	233
Total assets	16,580	16,318
Current liabilities:
Accounts payable	240	452
Accrued interest	55	48
Accrued property, income and other taxes	119	132
Current portion of long-term debt	500	350
Other current liabilities	152	128
Total current liabilities	1,066	1,110
Long-term debt	4,879	4,692
Deferred income taxes	2,224	2,237
Regulatory liabilities	1,688	1,661
Asset retirement obligations	535	528
Other long-term liabilities	318	326
Total liabilities	10,710	10,554
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	561	561
Retained earnings	5,309	5,203
Total BHE shareholders' equity	5,870	5,764
Total liabilities and equity	$ 16,580	$ 16,318

Consolidated Balance Sheets Bal

Consolidated Balance Sheets Balance Sheets (Parenthetical) - MEC - $ / shares shares in Millions	Mar. 31, 2018	Dec. 31, 2017
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77
MidAmerican Energy Company [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	350	350
Common stock, shares issued	71	71
Common stock, shares outstanding	71	71

Consolidated Balance Sheets - M

Consolidated Balance Sheets - MidAmerican Funding - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 1,644	$ 935
Income taxes receivable		458	334
Inventories		864	888
Other current assets		963	815
Total current assets		6,353	5,778
Property, plant and equipment, net		66,054	65,871
Goodwill		9,665	9,678
Regulatory assets		2,812	2,761
Investments and restricted cash and cash equivalents and investments		4,796	4,872
Other assets		1,232	1,248
Total assets		90,912	90,208
Current liabilities:
Accounts payable		1,089	1,519
Accrued interest		507	488
Accrued property, income and other taxes		446	354
Short-term debt		2,608	4,488
Other current liabilities		1,209	1,049
Total current liabilities		10,492	11,603
Deferred income taxes		8,086	8,242
Regulatory liabilities		7,368	7,309
Other long-term liabilities		2,988	2,984
Total liabilities		62,118	61,900
Commitments and contingencies
Equity:
Additional paid-in capital		6,363	6,368
Retained earnings		23,719	22,206
Accumulated other comprehensive loss, net		(1,415)	(398)
Total member's equity		28,667	28,176
Total liabilities and equity		90,912	90,208
MidAmerican Funding, LLC and Subsidiaries [Domain]
Current assets:
Cash and cash equivalents		380	172
Receivables, net		320	348
Income taxes receivable		132	64
Inventories		208	245
Other current assets		138	134
Total current assets		1,178	963
Property, plant and equipment, net		14,282	14,221
Goodwill		1,270	1,270
Regulatory assets		209	204
Investments and restricted cash and cash equivalents and investments		725	730
Other assets		215	233
Total assets	[1]	17,879	17,621
Current liabilities:
Accounts payable		240	451
Accrued interest		57	53
Accrued property, income and other taxes		119	133
Notes Payable, Related Parties, Current		167	164
Current portion of long-term debt		500	350
Other current liabilities		152	128
Total current liabilities		1,235	1,279
Long-term debt		5,119	4,932
Deferred income taxes		2,222	2,235
Regulatory liabilities		1,688	1,661
Asset retirement obligations		535	528
Other long-term liabilities		317	326
Total liabilities		11,116	10,961
Commitments and contingencies
Equity:
Additional paid-in capital		1,679	1,679
Retained earnings		5,084	4,981
Total member's equity		6,763	6,660
Total liabilities and equity		$ 17,879	$ 17,621
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Consolidated Balance Sheets - N

Consolidated Balance Sheets - NPC - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,644	$ 935
Inventories	864	888
Other current assets	963	815
Total current assets	6,353	5,778
Regulatory assets	2,812	2,761
Other assets	1,232	1,248
Total assets	90,912	90,208
Current liabilities:
Accounts payable	1,089	1,519
Accrued interest	507	488
Accrued property, income and other taxes	446	354
Other current liabilities	1,209	1,049
Total current liabilities	10,492	11,603
Regulatory liabilities	7,368	7,309
Deferred income taxes	8,086	8,242
Other long-term liabilities	2,988	2,984
Total liabilities	62,118	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,363	6,368
Retained earnings	23,719	22,206
Accumulated other comprehensive loss, net	(1,415)	(398)
Total BHE shareholders' equity	28,667	28,176
Total liabilities and equity	90,912	90,208
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	97	57
Receivables, net	191	238
Inventories	58	59
Regulatory assets	28	28
Other current assets	59	44
Total current assets	433	426
Property, plant and equipment, net	6,855	6,877
Regulatory assets	928	941
Other assets	38	35
Total assets	8,254	8,279
Current liabilities:
Accounts payable	125	156
Accrued interest	39	50
Accrued property, income and other taxes	70	63
Regulatory liabilities	104	91
Current portion of long-term debt and financial and capital lease obligations	1,340	842
Customer deposits	61	73
Other current liabilities	46	16
Total current liabilities	1,785	1,291
Long-term debt and financial and capital lease obligations	1,732	2,233
Regulatory liabilities	1,015	1,030
Deferred income taxes	764	767
Other long-term liabilities	280	280
Total liabilities	5,576	5,601
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	374	374
Accumulated other comprehensive loss, net	(4)	(4)
Total BHE shareholders' equity	2,678	2,678
Total liabilities and equity	$ 8,254	$ 8,279

Consolidated Balance Sheets (P9

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Mar. 31, 2018	Dec. 31, 2017
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
Nevada Power Company [Member]
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

Consolidated Balance Sheets - S

Consolidated Balance Sheets - SPPC - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,644	$ 935
Trade receivables, net	1,772	2,014
Inventories	864	888
Other current assets	963	815
Total current assets	6,353	5,778
Regulatory assets	2,812	2,761
Other assets	1,232	1,248
Total assets	90,912	90,208
Current liabilities:
Accounts payable	1,089	1,519
Accrued interest	507	488
Accrued property, income and other taxes	446	354
Other current liabilities	1,209	1,049
Total current liabilities	10,492	11,603
Regulatory liabilities	7,368	7,309
Deferred income taxes	8,086	8,242
Other long-term liabilities	2,988	2,984
Total liabilities	62,118	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,363	6,368
Retained earnings	23,719	22,206
Accumulated other comprehensive loss, net	(1,415)	(398)
Total BHE shareholders' equity	28,667	28,176
Total liabilities and equity	90,912	90,208
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	32	4
Trade receivables, net	107	112
Inventories	48	49
Regulatory assets	18	32
Other current assets	24	17
Total current assets	229	214
Property, plant and equipment, net	2,901	2,892
Regulatory assets	300	300
Other assets	9	7
Total assets	3,439	3,413
Current liabilities:
Accounts payable	74	92
Accrued interest	11	14
Accrued property, income and other taxes	13	10
Regulatory liabilities	27	19
Current portion of long-term debt and financial and capital lease obligations	2	2
Customer deposits	17	15
Other current liabilities	18	12
Total current liabilities	162	164
Long-term debt and financial and capital lease obligations	1,151	1,152
Regulatory liabilities	474	481
Deferred income taxes	338	330
Other long-term liabilities	108	114
Total liabilities	2,233	2,241
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	96	62
Accumulated other comprehensive loss, net	(1)	(1)
Total BHE shareholders' equity	1,206	1,172
Total liabilities and equity	$ 3,439	$ 3,413

Consolidated Balance Sheets (11

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Mar. 31, 2018	Dec. 31, 2017
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
Sierra Pacific Power Company [Member]
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

Consolidated Balance Sheets (12

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2018	Dec. 31, 2017
BHE shareholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenue:
Energy	$ 3,679	$ 3,581
Real estate	761	585
Total operating revenue	4,440	4,166
Energy:
Cost of sales	1,168	1,119
Operating expense	928	887
Depreciation and amortization	704	610
Real estate	769	583
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Other income (expense):
Interest expense	(466)	(458)
Capitalized interest	12	10
Allowance for equity funds	21	17
Interest and dividend income	26	26
Realized and unrealized (loss) gain on marketable securities, net	(209)
Realized and unrealized (loss) gain on marketable securities, net		3
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax (benefit) expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Equity income	12	24
Net income	518	563
Net income attributable to noncontrolling interests	5	7
Net income attributable to BHE shareholders	$ 513	$ 556

Consolidated Statements of Op14

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating costs and expenses:
Operating income	$ 871	$ 967
Other income (expense):
Interest expense	(466)	(458)
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net income attributable to BHE shareholders	513	556
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,184	1,281
Operating costs and expenses:
Cost of Domestic Regulated Electric	433	441
Utilities Operating Expense, Maintenance and Operations	250	254
Utilities Operating Expense, Depreciation and Amortization	202	196
Utilities Operating Expense, Taxes	52	51
Utilities Operating Expense	937	942
Operating income	247	339
Other income (expense):
Interest expense	(96)	(95)
Interest Costs Capitalized Adjustment	4	4
Allowance for equity funds	7	7
Other, net	11	9
Total other income (expense)	(74)	(75)
Income before income tax expense and equity income	173	264
Income tax (benefit) expense	25	85
Net income attributable to BHE shareholders	$ 148	$ 179

Statements of Operations - MEC

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenue:
Total operating revenue	$ 4,440	$ 4,166
Operating costs and expenses:
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Other income (expense):
Interest expense	(466)	(458)
Allowance for borrowed funds	12	10
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax (benefit) expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net Income (Loss) Attributable to Parent	513	556
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	469	433
Gas Domestic Regulated Revenue And Other Revenue	277	262
Total operating revenue	746	695
Operating costs and expenses:
Cost of Domestic Regulated Electric	108	102
Cost of gas sold and other	179	172
Utilities Operating Expense, Maintenance and Operations	190	171
Utilities Operating Expense, Depreciation and Amortization	158	117
Utilities Operating Expense, Taxes	32	31
Total operating costs and expenses	667	593
Operating income	79	102
Other income (expense):
Interest expense	(58)	(53)
Allowance for borrowed funds	4	2
Allowance for equity funds	10	6
Other, net	9	11
Total other income (expense)	(35)	(34)
Income before income tax (benefit) expense and equity income	44	68
Income tax (benefit) expense	(62)	(37)
Net Income (Loss) Attributable to Parent	$ 106	$ 105

Consolidated Statements of Op16

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenue:
Total operating revenue	$ 4,440	$ 4,166
Operating costs and expenses:
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Other income (expense):
Other Interest and Dividend Income	(466)	(458)
Allowance for borrowed funds	12	10
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax (benefit) expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net Income (Loss) Attributable to Parent	513	556
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	469	433
Gas Domestic Regulated Revenue And Other Revenue	278	263
Total operating revenue	747	696
Operating costs and expenses:
Cost of Domestic Regulated Electric	108	102
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	180	172
Utilities Operating Expense, Maintenance and Operations	190	172
Utilities Operating Expense, Depreciation and Amortization	158	117
Utilities Operating Expense, Taxes	32	31
Total operating costs and expenses	668	594
Operating income	79	102
Other income (expense):
Other Interest and Dividend Income	(63)	(59)
Allowance for borrowed funds	4	2
Allowance for equity funds	10	6
Other, net	10	11
Total other income (expense)	(39)	(40)
Income before income tax (benefit) expense and equity income	40	62
Income tax (benefit) expense	(63)	(40)
Net Income (Loss) Attributable to Parent	$ 103	$ 102

Consolidated Statements of Op17

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cost of sales	$ 1,168	$ 1,119
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Interest expense	(466)	(458)
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net income attributable to BHE shareholders	513	556
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	395	392
Cost of sales	170	165
Utilities Operating Expense, Maintenance and Operations	91	88
Utilities Operating Expense, Depreciation and Amortization	84	76
Utilities Operating Expense, Taxes	10	10
Total operating costs and expenses	355	339
Operating income	40	53
Interest expense	(45)	(44)
Allowance for equity funds	1	1
Other, net	4	5
Total other income (expense)	(40)	(38)
Income before income tax expense and equity income	0	15
Income tax (benefit) expense	0	5
Net income attributable to BHE shareholders	$ 0	$ 10

Consolidated Statements of Op18

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total operating revenue	$ 4,440	$ 4,166
Cost of sales	1,168	1,119
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Interest expense	(466)	(458)
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net income attributable to BHE shareholders	513	556
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	181	159
Gas Domestic Regulated Revenue	41	34
Total operating revenue	222	193
Cost of sales	77	56
Cost of Purchased Oil and Gas	23	16
Utilities Operating Expense, Maintenance and Operations	39	41
Utilities Operating Expense, Depreciation and Amortization	30	28
Utilities Operating Expense, Taxes	6	6
Total operating costs and expenses	175	147
Operating income	47	46
Interest expense	(10)	(11)
Allowance for equity funds	1	1
Other, net	2	1
Total other income (expense)	(7)	(9)
Income before income tax expense and equity income	40	37
Income tax (benefit) expense	6	13
Net income attributable to BHE shareholders	$ 34	$ 24

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 518	$ 563
Other comprehensive income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	3	(5)
Foreign currency translation adjustment	73	87
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	38
Unrealized losses on cash flow hedges, net of tax	(2)	(4)
Total other comprehensive (loss) income, net of tax	68	126
Comprehensive income	586	689
Comprehensive income attributable to noncontrolling interests	5	7
Comprehensive income attributable to BHE shareholders	$ 581	$ 682

Statements of Comprehensive Inc

Statements of Comprehensive Income - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Comprehensive income attributable to BHE shareholders	581	682
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	$ 106	$ 105

Statements of Comprehensive I21

Statements of Comprehensive Income (Parenthetical) - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unrealized (losses) gains on marketable securities, tax	$ 0	$ 18
Unrealized (losses) gains on cash flow hedges, tax	$ (1)	$ (2)

Consolidated Statements of Co22

Consolidated Statements of Comprehensive Income - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Comprehensive income attributable to BHE shareholders	581	682
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	$ 103	$ 102

Consolidated Statements of Co23

Consolidated Statements of Comprehensive Income (Parenthetical) - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unrealized (losses) gains on marketable securities, tax	$ 0	$ 18
Unrealized (losses) gains on cash flow hedges, tax	$ (1)	$ (2)

Consolidated Statements of Co24

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ (4)	$ (1)
Unrealized (losses) gains on marketable securities, tax	0	18
Unrealized (losses) gains on cash flow hedges, tax	$ (1)	$ (2)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax					$ 585
Balance (shares) at Dec. 31, 2016		77
Balance at Dec. 31, 2016	$ 24,463	$ 0	$ 6,390	$ 19,448	(1,511)	$ 136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	560	0	0	556	0	4
Other comprehensive income (loss)	126	0	0	0	126	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	38				38
Distributions	(7)	0	0	0	0	(7)
Common stock purchases	(19)	0	(1)	(18)	0	0
Other equity transactions	(11)	$ 0	(8)	0	0	(3)
Balance (shares) at Mar. 31, 2017		77
Balance at Mar. 31, 2017	$ 25,112	$ 0	6,381	19,986	(1,385)	130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax					623
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax					1,085
Balance (shares) at Dec. 31, 2017	77	77
Balance at Dec. 31, 2017	$ 28,308	$ 0	6,368	22,206	(398)	132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	517	0	0	513	0	4
Other comprehensive income (loss)	68	0	0	0	68	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0			1,085	(1,085)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0				0
Distributions	(9)	0	0	0	0	(9)
Common stock purchases	$ (90)	$ 0	(5)	(85)	0	0
Balance (shares) at Mar. 31, 2018	77	77
Balance at Mar. 31, 2018	$ 28,794	$ 0	$ 6,363	$ 23,719	(1,415)	$ 127
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax					$ 0

Consolidated Statements of Ch26

Consolidated Statements of Changes in Equity - PacifiCorp - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [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 (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016						$ 7,390	$ 2	$ 0	$ 4,479	$ 2,921	$ (12)
Net Income (Loss) Attributable to Parent	$ 556					179				179
Total other comprehensive (loss) income, net of tax	126	$ 0	$ 0	$ 0	$ 126
Dividends, Common Stock, Cash						(100)				(100)
Stockholders' Equity Attributable to Parent at Mar. 31, 2017						7,469	2	0	4,479	3,000	(12)
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176					7,555	2	0	4,479	3,089	(15)
Net Income (Loss) Attributable to Parent	513					148				148
Total other comprehensive (loss) income, net of tax	68	$ 0	$ 0	$ 0	$ 68
Dividends, Common Stock, Cash						(250)				(250)
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667					$ 7,453	$ 2	$ 0	$ 4,479	$ 2,987	$ (15)

Statements of Changes in Equity

Statements of Changes in Equity - MEC - USD ($) $ in Millions	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]Common Stock [Member]	MidAmerican Energy Company [Member]Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 5,160	$ 561	$ 4,599
Net Income (Loss) Attributable to Parent	$ 556				105		105
Other comprehensive income (loss)	126	$ 0	$ 0	$ 126
Stockholders' Equity, Other	(11)	0	0	0
Stockholders' Equity Attributable to Parent at Mar. 31, 2017					5,265	561	4,704
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				5,764	561	5,203
Net Income (Loss) Attributable to Parent	513				106		106
Other comprehensive income (loss)	68	$ 0	$ 0	$ 68
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667				$ 5,870	$ 561	$ 5,309

Consolidated Statements of Ch28

Consolidated Statements of Changes in Equity - MidAmerican Funding - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [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]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 6,086	$ 1,679	$ 4,407
Net Income (Loss) Attributable to Parent	$ 556				102		102
Other comprehensive income (loss)	126	$ 0	$ 0	$ 126
Stockholders' Equity Attributable to Parent at Mar. 31, 2017					6,188	1,679	4,509
Stockholders' Equity, Other	(11)	(8)	0	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				6,660	1,679	4,981
Net Income (Loss) Attributable to Parent	513				103		103
Other comprehensive income (loss)	68	$ 0	$ 0	$ 68
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667				$ 6,763	$ 1,679	$ 5,084

Consolidated Statements of Ch29

Consolidated Statements of Changes in Equity - NPC - USD ($) $ in Millions	Total	Common Stock [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 (Loss) Income, Net [Member]
Balance (shares) at Dec. 31, 2016		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016			$ 2,972	$ 0	$ 2,308	$ 667	$ (3)
Net Income (Loss) Attributable to Parent	$ 556		10			10
Dividends, Common Stock, Cash			75			75
Balance (shares) at Mar. 31, 2017		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2017			$ 2,907	$ 0	2,308	602	(3)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	$ 28,176		$ 2,678	$ 0	2,308	374	(4)
Net Income (Loss) Attributable to Parent	$ 513		$ 0
Balance (shares) at Mar. 31, 2018	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667		$ 2,678	$ 0	$ 2,308	$ 374	$ (4)

Consolidated Statements of Ch30

Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Common Stock [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 (Loss) Income, Net [Member]
Balance (shares) at Dec. 31, 2016		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016			$ 1,108	$ 0	$ 1,111	$ (2)	$ (1)
Net Income (Loss) Attributable to Parent	$ 556		24			24
Dividends, Common Stock, Cash			2	$ 0		2	0
Balance (shares) at Mar. 31, 2017		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2017			$ 1,130	$ 0	1,111	20	(1)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	$ 28,176		$ 1,172	$ 0	1,111	62	(1)
Net Income (Loss) Attributable to Parent	$ 513		$ 34			34
Balance (shares) at Mar. 31, 2018	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667		$ 1,206	$ 0	$ 1,111	$ 96	$ (1)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 518	$ 563
Adjustments to reconcile net income to net cash flows from operating activities:
Realized and unrealized (loss) gain on marketable securities, net	(209)
Realized and unrealized loss (gain) on marketable securities, net		(3)
Depreciation and amortization	716	622
Allowance for equity funds	(21)	(17)
Equity income, net of distributions	(5)	(13)
Changes in regulatory assets and liabilities	94	20
Deferred income taxes and amortization of investment tax credits	(166)	224
Other, net	19	(2)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	250	308
Derivative collateral, net	(14)	(23)
Pension and other postretirement benefit plans	(21)	(17)
Accrued property, income and other taxes	(60)	(187)
Accounts payable and other liabilities	(40)	(37)
Net cash flows from operating activities	1,479	1,438
Cash flows from investing activities:
Capital expenditures	(1,075)	(865)
Acquisitions, net of cash acquired	0	(579)
Purchases of marketable securities	155	81
Proceeds from sales of marketable securities	132	83
Equity method investments	(156)	(84)
Other, net	31	(12)
Net cash flows from investing activities	(1,223)	(1,538)
Cash flows from financing activities:
Proceeds from Issuance of Unsecured Debt	2,176	0
Repayments of Long-term Debt	0	(200)
Common stock purchases	(90)	(19)
Proceeds from subsidiary debt	687	844
Repayments of subsidiary debt	(550)	(425)
Net (repayments of) proceeds from short-term debt	(1,873)	140
Other, net	(14)	(12)
Net cash flows from financing activities	336	328
Effect of exchange rate changes	1	1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
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	1,644
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,876	$ 1,232

Consolidated Statements of Ca32

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(21)	(17)
Deferred income taxes and amortization of investment tax credits	(166)	224
Changes in regulatory assets and liabilities	94	20
Other Noncash Income (Expense)	19	(2)
Trade receivables and other assets	250	308
Derivative collateral, net	(14)	(23)
Accounts payable and other liabilities	(40)	(37)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Other, net	31	(12)
Net cash flows from investing activities	(1,223)	(1,538)
Net proceeds from (repayments of) short-term debt	1,873	(140)
Other, net	(14)	(12)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,232
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	148	179
Utilities Operating Expense, Depreciation and Amortization	202	196
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(7)	(7)
Deferred income taxes and amortization of investment tax credits	(28)	(5)
Changes in regulatory assets and liabilities	60	19
Other Noncash Income (Expense)	1	0
Trade receivables and other assets	90	115
Derivative collateral, net	(3)	(7)
Increase (Decrease) in Inventories	(12)	2
Increase (Decrease) in Prepaid Expense	7	6
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	52	97
Accounts payable and other liabilities	23	(7)
Net cash flows from operating activities	533	588
Capital expenditures	(236)	(178)
Other, net	(1)	0
Net cash flows from investing activities	(237)	(178)
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(87)	(51)
Net proceeds from (repayments of) short-term debt	44	(262)
Payments of Ordinary Dividends, Common Stock	(250)	(100)
Net cash flows from financing activities	(293)	(413)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	3	(3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 32	$ 30

Statements of Cash Flows - MEC

Statements of Cash Flows - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Deferred income taxes and amortization of investment tax credits	(166)	224
Other Noncash Income (Expense)	19	(2)
Derivative collateral, net	(14)	(23)
Pension and other postretirement benefit plans	(21)	(17)
Accrued property, income and other taxes	(60)	(187)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Purchases of marketable securities	155	81
Proceeds from sales of marketable securities	132	83
Other, net	31	(12)
Net cash flows from investing activities	(1,223)	(1,538)
Repayments of Long-term Debt	0	(200)
Net (repayments of) proceeds from short-term debt	(1,873)	140
Other, net	(14)	(12)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,644
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,232
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	106	105
Utilities Operating Expense, Depreciation and Amortization	158	117
Deferred income taxes and amortization of investment tax credits	19	13
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	10	11
Other Noncash Income (Expense)	(10)	(6)
Increase (Decrease) in Accounts and Other Receivables	23	39
Increase (Decrease) in Inventories	37	22
Derivative collateral, net	(2)	0
Pension and other postretirement benefit plans	(3)	(3)
Increase (Decrease) in Accounts Payable	(58)	1
Accrued property, income and other taxes	(82)	(71)
Increase (Decrease) in Other Current Assets and Liabilities, Net	32	(6)
Net cash flows from operating activities	230	222
Capital expenditures	(365)	(238)
Purchases of marketable securities	95	40
Proceeds from sales of marketable securities	74	35
Other, net	15	(3)
Net cash flows from investing activities	(371)	(246)
Proceeds from Issuance of Long-term Debt	687	843
Repayments of Long-term Debt	(350)	(255)
Net (repayments of) proceeds from short-term debt	0	(99)
Net cash flows from financing activities	337	489
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	196	465
Cash and cash equivalents and restricted cash and cash equivalents at end of period	380
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 478	$ 491

Consolidated Statements of Ca34

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Deferred income taxes and amortization of investment tax credits	(166)	224
Other Noncash Income (Expense)	19	(2)
Derivative collateral, net	(14)	(23)
Pension and other postretirement benefit plans	(21)	(17)
Accrued property, income and other taxes	(60)	(187)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Purchases of marketable securities	(155)	(81)
Proceeds from sales of marketable securities	132	83
Other, net	31	(12)
Net cash flows from investing activities	(1,223)	(1,538)
Repayments of Long-term Debt	0	(200)
Net (repayments of) proceeds from short-term debt	(1,873)	140
Other, net	(14)	(12)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,283	1,003
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,644
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	103	102
Utilities Operating Expense, Depreciation and Amortization	158	117
Deferred income taxes and amortization of investment tax credits	19	13
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	10	10
Other Noncash Income (Expense)	(9)	(6)
Increase (Decrease) in Accounts and Other Receivables	27	41
Increase (Decrease) in Inventories	37	22
Derivative collateral, net	(2)	0
Pension and other postretirement benefit plans	(3)	(3)
Increase (Decrease) in Accounts Payable	(57)	2
Accrued property, income and other taxes	(83)	(73)
Increase (Decrease) in Other Current Assets and Liabilities, Net	28	(11)
Net cash flows from operating activities	228	214
Capital expenditures	(365)	(238)
Purchases of marketable securities	(95)	(40)
Proceeds from sales of marketable securities	74	35
Other, net	15	(3)
Net cash flows from investing activities	(371)	(246)
Proceeds from Issuance of Long-term Debt	687	843
Repayments of Long-term Debt	(350)	(255)
Increase (Decrease) in Notes Payable, Related Parties, Current	2	8
Net (repayments of) proceeds from short-term debt	0	(99)
Net cash flows from financing activities	339	497
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	196	465
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	282	$ 27
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 380

Consolidated Statements of Ca35

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Deferred income taxes and amortization of investment tax credits	(166)	224
Allowance for equity funds	(21)	(17)
Changes in regulatory assets and liabilities	94	20
Other Noncash Income (Expense)	19	(2)
Trade receivables and other assets	250	308
Accrued property, income and other taxes	(60)	(187)
Accounts payable and other liabilities	(40)	(37)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Acquisitions, net of cash acquired	0	(579)
Net cash flows from investing activities	(1,223)	(1,538)
Repayments of Long-term Debt	0	(200)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,232
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	0	10
Utilities Operating Expense, Depreciation and Amortization	84	76
Deferred income taxes and amortization of investment tax credits	(7)	22
Allowance for equity funds	(1)	(1)
Changes in regulatory assets and liabilities	10	3
Deferred Energy Change	0	(25)
Amortization of Deferred Charges	3	3
Other Noncash Income (Expense)	9	(2)
Trade receivables and other assets	48	52
Increase (Decrease) in Inventories	1	7
Accrued property, income and other taxes	(1)	(26)
Accounts payable and other liabilities	(36)	(29)
Net cash flows from operating activities	110	90
Capital expenditures	(64)	(58)
Acquisitions, net of cash acquired	0	(77)
Net cash flows from investing activities	(64)	(135)
Repayments of Long-term Debt	(5)	(79)
Payments of Ordinary Dividends, Common Stock	0	(75)
Net cash flows from financing activities	(5)	(154)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	41	(199)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 107	$ 91

Consolidated Statements of Ca36

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Allowance for equity funds	(21)	(17)
Deferred income taxes and amortization of investment tax credits	(166)	224
Changes in regulatory assets and liabilities	94	20
Other Noncash Income (Expense)	(19)	2
Trade receivables and other assets	250	308
Accrued property, income and other taxes	(60)	(187)
Accounts payable and other liabilities	(40)	(37)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Net cash flows from investing activities	(1,223)	(1,538)
Repayments of Long-term Debt	0	(200)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,232
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	34	24
Utilities Operating Expense, Depreciation and Amortization	30	28
Allowance for equity funds	(1)	(1)
Deferred income taxes and amortization of investment tax credits	6	13
Changes in regulatory assets and liabilities	12	3
Deferred Energy Change	13	(11)
Amortization of Deferred Charges	(4)	(21)
Other Noncash Income (Expense)	0	(2)
Trade receivables and other assets	3	20
Increase (Decrease) in Inventories	0	(3)
Accrued property, income and other taxes	(2)	(3)
Accounts payable and other liabilities	(16)	(63)
Net cash flows from operating activities	75	(12)
Capital expenditures	(45)	(41)
Net cash flows from investing activities	(45)	(41)
Proceeds from Issuance of Long-term Debt	0	6
Repayments of Long-term Debt	0	(1)
Payments of Ordinary Dividends, Common Stock	0	(2)
Net cash flows from financing activities	0	3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	30	(50)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 38	$ 10

General

General	3 Months Ended
	Mar. 31, 2018
Segment Reporting Information [Line Items]
General/Organization and Operations	General 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 (which primarily consists of BHE Renewables, LLC and CalEnergy Philippines ) 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 solar, wind, 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. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of March 31, 2018 and for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month period ended March 31, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in the Company's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .
PacifiCorp [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General 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 "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of March 31, 2018 and for the three-month periods ended March 31, 2018 and 2017 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month periods ended March 31, 2018 and 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in PacifiCorp's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in PacifiCorp's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General 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 consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The unaudited Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Financial Statements as of March 31, 2018 , and for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month periods ended March 31, 2018 , are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Financial Statements. Note 2 of Notes to Financial Statements included in MidAmerican Energy's Annual Report on Form 10-K for the year ended December 31, 2017 , describes the most significant accounting policies used in the preparation of the unaudited Financial Statements. There have been no significant changes in MidAmerican Energy's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
General/Organization and Operations	General MidAmerican Funding, LLC (" MidAmerican Funding ") is an Iowa limited liability company with Berkshire Hathaway Energy Company (" BHE ") as its sole member. 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. and MEC Construction Services Co. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of March 31, 2018 , and for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month periods ended March 31, 2018 , are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in MidAmerican Funding 's Annual Report on Form 10-K for the year ended December 31, 2017 , describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in MidAmerican Funding 's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .
Nevada Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General 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 the 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 "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of March 31, 2018 and for the three-month periods ended March 31, 2018 and 2017 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month period ended March 31, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Nevada Power's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Nevada Power's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General Sierra Pacific Power Company, together with its subsidiaries ("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 "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of March 31, 2018 and for the three-month periods ended March 31, 2018 and 2017 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2018 and 2017 . The results of operations for the three-month period ended March 31, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Sierra Pacific's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Sierra Pacific's assumptions regarding significant accounting estimates and policies during the three-month period ended March 31, 2018 .

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-02, which amends FASB Accounting Standards Codification ("ASC") Topic 220, "Income Statement - Reporting Comprehensive Income." The amendments in this guidance require a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects that were created from the Tax Cuts and Jobs Act enacted on December 22, 2017 ("2017 Tax Reform"). The reclassification is the difference between the historical income tax rates and the enacted rate for the items previously recorded in accumulated other comprehensive income. 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 retrospectively to each period in which the effect of the change in the 2017 Tax Reform is recognized. Considering the significant components of the Company's accumulated other comprehensive income relate to (a) unrecognized amounts on retirement benefits of foreign pension plans and (b) unrealized gains on available-for-sale securities, which were reclassified as required by ASU No. 2016-01 that was adopted on January 1, 2018, the adoption of ASU No. 2018-02 will not have a material impact on its 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to 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. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." 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 plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	( 2 ) New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." 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 plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." 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 plans to adopt this guidance effective January 1, 2019, and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements.
MidAmerican Funding, LLC and Subsidiaries [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements Refer to Note 2 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." 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 plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." 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 plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.

Business Acquisitions (Notes)

Business Acquisitions (Notes)	3 Months Ended
	Mar. 31, 2018
Business Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Business Acquisitions 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 formula totaling $131 million . The Company completed various acquisitions totaling $579 million , net of cash acquired, for the three-month period ended March 31, 2017. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which related primarily to development and construction costs for the 110-megawatt Alamo 6 solar-powered generation project, the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power and a residential real estate brokerage business. There were no other material assets acquired or liabilities assumed.

Investments and Restricted Cash

Investments and Restricted Cash and Investments	3 Months Ended
	Mar. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Investments and Restricted Cash and Investments	Investments and Restricted Cash and Cash Equivalents and Investments Investments and restricted cash and cash equivalents and investments consists of the following (in millions): As of March 31, December 31, 2018 2017 Investments: BYD Company Limited common stock $ 1,754 $ 1,961 Rabbi trusts 387 441 Other 183 124 Total investments 2,324 2,526 Equity method investments: BHE Renewables tax equity investments 1,177 1,025 Electric Transmission Texas, LLC 536 524 Bridger Coal Company 129 137 Other 143 148 Total equity method investments 1,985 1,834 Restricted cash and cash equivalents and investments: Quad Cities Station nuclear decommissioning trust funds 512 515 Restricted cash and cash equivalents 232 348 Total restricted cash and cash equivalents and investments 744 863 Total investments and restricted cash and cash equivalents and investments $ 5,053 $ 5,223 Reflected as: Current assets $ 257 $ 351 Noncurrent assets 4,796 4,872 Total investments and restricted cash and cash equivalents and investments $ 5,053 $ 5,223 Investments In January 2016, the FASB issued ASU 2016-01 which amended 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 accumulated other comprehensive income (loss) ("AOCI"). The portion of unrealized losses for the three-month period ended March 31, 2018 related to investments still held as of March 31, 2018 is calculated as follows (in millions): Realized and unrealized losses on marketable securities recognized during the period $ (209 ) Less: Net gains recognized during the period on investments sold during the period 2 Unrealized losses recognized during the period on investments still held at the reporting date $ (211 ) Equity Method Investments 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 $19 million previously recognized within investing cash flows to operating cash flows for the three-month period ended March 31, 2017 . Cash and Cash Equivalents and Restricted Cash and Cash Equivalents 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. The Company adopted this guidance January 1, 2018. 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 March 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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 1,644 $ 935 Restricted cash and cash equivalents 212 327 Investments and restricted cash and cash equivalents and investments 20 21 Total cash and cash equivalents and restricted cash and cash equivalents $ 1,876 $ 1,283

Property, Plant and Equipment,

Property, Plant and Equipment, Net	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, plant and equipment, net consists of the following (in millions): As of Depreciable March 31, December 31, Life 2018 2017 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 75,068 $ 74,660 Interstate natural gas pipeline assets 3-80 years 7,230 7,176 82,298 81,836 Accumulated depreciation and amortization (24,957 ) (24,478 ) Regulated assets, net 57,341 57,358 Nonregulated assets: Independent power plants 5-30 years 6,034 6,010 Other assets 3-30 years 1,588 1,489 7,622 7,499 Accumulated depreciation and amortization (1,644 ) (1,542 ) Nonregulated assets, net 5,978 5,957 Net operating assets 63,319 63,315 Construction work-in-progress 2,735 2,556 Property, plant and equipment, net $ 66,054 $ 65,871 Construction work-in-progress includes $2.4 billion as of March 31, 2018 and $2.2 billion as of December 31, 2017 , related to the construction of regulated assets.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had as of March 31, 2018 and December 31, 2017 , nonregulated property gross of $24 million and related accumulated depreciation and amortization of $10 million , 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	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of March 31, December 31, Depreciable Life 2018 2017 Utility plant in service, net: Generation 20-70 years $ 12,108 $ 12,107 Transmission 52-75 years 1,844 1,838 Electric distribution 20-75 years 3,418 3,380 Gas distribution 29-75 years 1,652 1,640 Utility plant in service 19,022 18,965 Accumulated depreciation and amortization (5,670 ) (5,561 ) Utility plant in service, net 13,352 13,404 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 13,358 13,410 Construction work-in-progress 910 797 Property, plant and equipment, net $ 14,268 $ 14,207
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of March 31, December 31, Depreciable Life 2018 2017 Utility Plant: Utility plant in-service 5-75 years $ 27,947 $ 27,880 Accumulated depreciation and amortization (9,503 ) (9,366 ) Utility plant in-service, net 18,444 18,514 Other non-regulated, net of accumulated depreciation and amortization 45 years 11 11 Plant, net 18,455 18,525 Construction work-in-progress 735 678 Property, plant and equipment, net $ 19,190 $ 19,203
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life March 31, December 31, 2018 2017 Utility plant: Generation 30 - 55 years $ 3,707 $ 3,707 Distribution 20 - 65 years 3,329 3,314 Transmission 45 - 70 years 1,864 1,860 General and intangible plant 5 - 65 years 805 793 Utility plant 9,705 9,674 Accumulated depreciation and amortization (2,930 ) (2,871 ) Utility plant, net 6,775 6,803 Other non-regulated, net of accumulated depreciation and amortization 45 years 2 1 Plant, net 6,777 6,804 Construction work-in-progress 78 73 Property, plant and equipment, net $ 6,855 $ 6,877 During 2017, Nevada Power revised its electric depreciations rates effective January 2018 based on the results of a new depreciation study, 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 will increase depreciation and amortization expense by $7 million annually, or $2 million for the three-month period ended March 31, 2018 , based on depreciable plant balances at the time of the change.
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life March 31, December 31, 2018 2017 Utility plant: Electric generation 25 - 60 years $ 1,143 $ 1,144 Electric distribution 20 - 100 years 1,470 1,459 Electric transmission 50 - 100 years 791 786 Electric general and intangible plant 5 - 70 years 181 181 Natural gas distribution 35 - 70 years 390 390 Natural gas general and intangible plant 5 - 70 years 14 14 Common general 5 - 70 years 296 294 Utility plant 4,285 4,268 Accumulated depreciation and amortization (1,531 ) (1,513 ) Utility plant, net 2,754 2,755 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,759 2,760 Construction work-in-progress 142 132 Property, plant and equipment, net $ 2,901 $ 2,892

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2018
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Retail Regulated Rates In December 2017, the Tax Cuts and Jobs Act ("2017 Tax Reform") was signed into law, reducing the federal tax rate from 35% to 21% . Accumulated deferred income tax balances were re-measured at the 21% rate, and regulatory liabilities increased reflective of the probability of such balances being passed back to customers. In March 2018, PacifiCorp proposed 1% rate reductions in Utah, Wyoming, and Idaho. PacifiCorp proposed the rate reductions to be effective May 1, 2018, in Utah and June 1, 2018, in Idaho. In April 2018, the Utah Public Service Commission ordered a rate reduction of $61 million effective May 1, 2018, through December 31, 2018, based on a preliminary estimate of the revenue requirement impact of 2017 Tax Reform. This credit will likely be adjusted effective January 1, 2019, when the final rates are approved in the next phase of the proceeding later in 2018. A procedural schedule is expected to be set by the Idaho Public Utilities Commission. PacifiCorp filed a partial settlement with the Wyoming Public Service Commission on April 11, 2018, that provides a rate reduction of approximately 3% beginning July 1, 2018 with the remaining tax savings to be deferred with offsets to other costs. As of March 31, 2018 , $53 million was accrued for the estimated potential refund liability attributable to lower customer rates enabled by the benefits of tax reform effective January 1, 2018.
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters 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. 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. 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 revenues related to equity returns above 9.7% . As a result of the order, Nevada Power recorded expense of $28 million primarily due to the reduction of a regulatory asset to return to customers revenue collected for costs not incurred. The new rates were effective on February 15, 2018. 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. The PUCN has not yet ruled on the filed motions. Nevada Power cannot predict the timing or ultimate outcome of the PUCN rulings. The Tax Cuts and Jobs Act (" 2017 Tax Reform ") enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the U.S. federal corporate income tax rate from 35% to 21% . In February 2018, Nevada Power made a filing with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from the 2017 Tax Reform for 2018 and beyond. The filing supports 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 has extended the procedural schedule to allow parties additional discovery relevant to the 2017 Tax Reform with a hearing scheduled in June 2018. Nevada Power cannot predict the timing or ultimate outcome of further regulatory proceedings. 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 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. This request is still pending. 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 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 December 2017, Caesars provided notice that it intends to transition eligible meters in the Nevada Power service territory to unbundled electric service in February 2018 at the earliest. In February 2018, Caesars became a distribution only service customer and started procuring energy from another energy supplier . Following the PUCN’s order from March 2017, Caesars’ will pay an impact fee of $44 million in 72 equal monthly payments .
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters 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. 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. 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 The Tax Cuts and Jobs Act (" 2017 Tax Reform ") enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the U.S. federal corporate income tax rate from 35% to 21% . In February 2018, Sierra Pacific made a filing with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from the 2017 Tax Reform for 2018 and beyond. The filing supports 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 has extended the procedural schedule to allow parties additional discovery relevant to the 2017 Tax Reform with a hearing scheduled in June 2018. Sierra Pacific cannot predict the timing or ultimate outcome of further regulatory proceedings. 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 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 an impact fee of $4 million in 36 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.

Cash and Cash Equivalents and R

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures (Notes)	3 Months Ended
	Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Cash Flow, Supplemental Disclosures [Text Block]	( 3 ) Restricted Cash and Cash Equivalents 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. Sierra Pacific adopted this guidance January 1, 2018. 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 March 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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 32 $ 4 Restricted cash and cash equivalents included in other current assets 6 4 Total cash and cash equivalents and restricted cash and cash equivalents $ 38 $ 8
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash Flow, Supplemental Disclosures [Text Block]	Restricted Cash and Cash Equivalents 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. Nevada Power adopted this guidance January 1, 2018. 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 March 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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 97 $ 57 Restricted cash and cash equivalents included in other current assets 10 9 Total cash and cash equivalents and restricted cash and cash equivalents $ 107 $ 66
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash Flow, Supplemental Disclosures [Text Block]	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 January 1, 2018. 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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 17 $ 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 $ 32 $ 29
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Cash Flow, Supplemental Disclosures [Text Block]	Cash and Cash Equivalents and Restricted Cash and Cash Equivalents 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. MidAmerican Funding adopted this guidance January 1, 2018. 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 March 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. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of March 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 March 31, 2018 December 31, 2017 Cash and cash equivalents $ 380 $ 172 Restricted cash and cash equivalents in other current assets 98 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 478 $ 282
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash Flow, Supplemental Disclosures [Text Block]	Cash and Cash Equivalents and Restricted Cash and Cash Equivalents 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. MidAmerican Energy adopted this guidance January 1, 2018. 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 March 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. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of March 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 March 31, 2018 December 31, 2017 Cash and cash equivalents $ 380 $ 172 Restricted cash and cash equivalents in other current assets 98 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 478 $ 282

Recent Financing Transactions

Recent Financing Transactions	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power intends to use the net proceeds, together with available cash, to repay all of Nevada Power's $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018, a portion of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018 and for general corporate purposes. In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due August 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In January 2018, BHE issued $450 million of its 2.375% Senior Notes due 2021, $400 million of its 2.800% Senior Notes due 2023, $600 million of its 3.250% Senior Notes due 2028 and $750 million of its 3.800% Senior Notes due 2048. The net proceeds were used to refinance a portion of the Company's short-term indebtedness and for general corporate purposes. Credit Facilities In April 2018, BHE terminated its $1.0 billion unsecured credit facility expiring May 2018 and amended and restated, with lender consent, its existing $2.0 billion unsecured credit facility expiring June 2020, increasing the lender commitment to $3.5 billion , extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million , extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp and MidAmerican Energy amended and restated their existing $600 million and $900 million unsecured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, Nevada Power and Sierra Pacific amended and restated their existing $400 million and $250 million secured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, ALP amended its existing C$750 million secured credit facility expiring December 2019, decreasing the lender commitment to C$500 million effective December 2018 and extending the expiration date to December 2022. ALP also amended its C$75 million secured credit facility expiring December 2019, extending the expiration date to December 2022.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power intends to use the net proceeds, together with available cash, to repay all of Nevada Power's $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018, and a portion of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018 and for general corporate purposes. Credit Facilities In April 2018, Nevada Power amended and restated its existing $400 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In April 2018, PacifiCorp amended and restated, its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million , extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated, its existing $600 million unsecured credit facility expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due August 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In March 2018, MidAmerican Energy repaid $350 million of its 5.30% Senior Notes due March 2018. Credit Facilities In April 2018, MidAmerican Energy amended and restated its existing $900 million unsecured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Refer to Note 5 of MidAmerican Energy's Notes to Financial Statements.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Credit Facilities In April 2018, Sierra Pacific amended and restated its existing $250 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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, the one-time repatriation tax of foreign earnings and profits and limitations on bonus depreciation for utility property. 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 has recorded the impacts of the 2017 Tax Reform and believes 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 has 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 believes the estimates for the repatriation tax to be reasonable, however, additional time is required to validate the inputs to the foreign earnings and profits calculation, the basis on which the repatriation tax is determined, and additional guidance is required to determine state income tax implications. The Company also believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified, estimates may change. The accounting is estimated to be completed by December 2018. During the three-month period ended March 31, 2018 , the Company reduced the liability estimate by $25 million based on additional guidance for certain state income tax implications of the repatriation tax. The accounting is estimated to be completed by December 2018. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (45 ) (16 ) State income tax, net of federal income tax benefit (30 ) (5 ) Income tax effect of foreign income (16 ) (5 ) Effects of ratemaking (8 ) (1 ) Equity income 1 1 Other (1 ) — Effective income tax rate (78 )% 9 % The effective tax rate decreased primarily due to the reduction in the United States federal corporate income tax rate from 35% to 21% , effective January 1, 2018, lower consolidated state income tax expense, lower United States income taxes on foreign earnings, higher production tax credits recognized of $29 million and the favorable impacts of rate making. 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. Berkshire Hathaway includes the Company in its United States federal income tax return. The Company's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable federal income taxes are remitted to or received from Berkshire Hathaway . For the three-month periods ended March 31, 2018 and 2017 , the Company did not receive or make any cash payments for federal income taxes from or to Berkshire Hathaway .
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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. 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. PacifiCorp has recorded the impacts of the 2017 Tax Reform and believes all the impacts to be complete with the exception of the interpretations of the bonus depreciation rules. PacifiCorp has 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 believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. During the three-month period ended March 31, 2018 , PacifiCorp did not make any revisions to its previous calculations. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % State income tax, net of federal income tax benefit 4 3 Federal income tax credits (5 ) (5 ) Effects of ratemaking (4 ) 1 Other (2 ) (2 ) Effective income tax rate 14 % 32 % 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. Berkshire Hathaway includes PacifiCorp in its United States federal income tax return. PacifiCorp's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable federal income taxes are remitted to or received from Berkshire Hathaway Energy Company. For the three-month periods ended March 31, 2018 and 2017 , PacifiCorp did not receive or make any cash payments for federal income taxes from or to Berkshire Hathaway Energy Company.
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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, the elimination of the deduction for production activities and limitations on bonus depreciation for utility property. In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 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 has recorded the impacts of the 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. Sierra Pacific has determined the amounts recorded and the interpretations relating to this items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Sierra Pacific believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Effects of ratemaking (5 ) — Other (1 ) — Effective income tax rate 15 % 35 %
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act The Tax Cuts and Jobs Act ("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. 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. MidAmerican Energy has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Energy has 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 believes its interpretations for bonus depreciation to be reasonable; however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. A reconciliation of the federal statutory income tax rate to MidAmerican Energy 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (137 ) (80 ) State income tax, net of federal income tax benefit (9 ) 2 Effects of ratemaking (18 ) (12 ) Other, net 2 1 Effective income tax rate (141 )% (54 )% Income tax credits relate primarily to production tax credits from 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. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Energy 's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Energy received net cash payments for income taxes from BHE totaling $14 million and $- million for the three-month periods ended March 31, 2018 and 2017 , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes The Tax Cuts and Jobs Act ("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. 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. MidAmerican Funding has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Funding has 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 believes its interpretations for bonus depreciation to be reasonable; however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. A reconciliation of the federal statutory income tax rate to MidAmerican Funding 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (151 ) (87 ) State income tax, net of federal income tax benefit (10 ) 2 Effects of ratemaking (20 ) (13 ) Other, net 2 (2 ) Effective income tax rate (158 )% (65 )% Income tax credits relate primarily to production tax credits from 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. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Funding 's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis, and substantially all of their currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Funding received net cash payments for income taxes from BHE totaling $14 million and $- million for the three-month periods ended March 31, 2018 and 2017 , respectively.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans 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 three-month period ended March 31, 2017 of $4 million have been reclassified to Other, net in the Consolidated Statements of Operations. Domestic Operations Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ 5 $ 6 Interest cost 26 29 Expected return on plan assets (41 ) (40 ) Net amortization 8 7 Net periodic benefit cost $ (2 ) $ 2 Other postretirement: Service cost $ 2 $ 2 Interest cost 6 6 Expected return on plan assets (10 ) (10 ) Net amortization (3 ) (3 ) Net periodic benefit credit $ (5 ) $ (5 ) Amounts other than the service cost for pension and other postretirement benefit plans are recorded in Other, net in the Consolidated Statements of Operations. Employer contributions to the domestic pension and other postretirement benefit plans are expected to be $39 million and $4 million , respectively, during 2018 . As of March 31, 2018 , $4 million of contributions had been made to the domestic pension benefit plans and no contributions had been made to the other postretirement benefit plans. Foreign Operations Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Service cost $ 5 $ 6 Interest cost 14 14 Expected return on plan assets (27 ) (24 ) Net amortization 15 17 Net periodic benefit cost $ 7 $ 13 Amounts other than the service cost for the United Kingdom pension plan are recorded in Other, net in the Consolidated Statements of Operations. Employer contributions to the United Kingdom pension plan are expected to be £46 million during 2018 . As of March 31, 2018 , £11 million , or $16 million , of contributions had been made to the United Kingdom pension plan.
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans 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 three-month period ended March 31, 2017 of $6 million have been reclassified to Other, net in the Consolidated Statements of Operations. Net periodic benefit (credit) cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ — $ — Interest cost 11 12 Expected return on plan assets (18 ) (18 ) Net amortization 3 4 Net periodic benefit credit $ (4 ) $ (2 ) Other postretirement: Service cost $ — $ 1 Interest cost 3 3 Expected return on plan assets (5 ) (6 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (3 ) $ (3 ) Amounts other than the service cost for pension and other postretirement benefit plans are recorded in Other, net in the Consolidated Statements of Operations. Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $- million, respectively, during 2018 . As of March 31, 2018 , $1 million and $- million of contributions had been made to the pension and other postretirement benefit plans, respectively.
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans 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, amounts other than the service cost for pension and other postretirement benefit plans for the three-month period ended March 31, 2017 of $5 million have been reclassified to Other, net in the Statements of Operations. 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. 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. Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ 2 $ 2 Interest cost 7 8 Expected return on plan assets (11 ) (11 ) Net amortization 1 — Net periodic benefit credit $ (1 ) $ (1 ) Other postretirement: Service cost $ 1 $ 1 Interest cost 2 2 Expected return on plan assets (3 ) (3 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (1 ) $ (1 ) Amounts other than the service cost for pension and other postretirement benefit plans are recorded in Other, net in the Statements of Operations. Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million , respectively, during 2018 . As of March 31, 2018 , $2 million and $- million of contributions had been made to the pension and other postretirement benefit plans, respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	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. 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 (in millions): As of March 31, December 31, 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (23 ) $ (23 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (10 ) (10 ) Other Postretirement Plans - Other long-term liabilities 1 1
Sierra Pacific Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	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. 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 Consolidated Balance Sheets and consist of the following (in millions): As of March 31, December 31, 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (2 ) $ (2 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (8 ) (8 ) Other Postretirement Plans - Other long-term liabilities (20 ) (20 )

Asset Retirement Obligation Ass

Asset Retirement Obligation Asset Retirement Obligations (Notes)	3 Months Ended
	Mar. 31, 2018
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Text Block]	Asset Retirement Obligations In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy concluded in March 2018 that it will discontinue sending CCR to surface impoundments effective April 2018 and 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 third quarter of 2018, 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 Obligation Disclosure [Text Block]	Asset Retirement Obligations Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements.

Risk Management and Hedging Act

Risk Management and Hedging Activities	3 Months Ended
	Mar. 31, 2018
PacifiCorp [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	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 regulated 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 Note 10 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 March 31, 2018 Not designated as hedging contracts (1) : Commodity assets $ 7 $ 2 $ 2 $ 1 $ 12 Commodity liabilities (3 ) — (45 ) (89 ) (137 ) Total 4 2 (43 ) (88 ) (125 ) Total derivatives 4 2 (43 ) (88 ) (125 ) Cash collateral receivable — — 19 58 77 Total derivatives - net basis $ 4 $ 2 $ (24 ) $ (30 ) $ (48 ) 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 March 31, 2018 and December 31, 2017 , a regulatory asset of $122 million and $101 million , respectively, was recorded related to the net derivative liability of $125 million and $104 million , respectively. The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ 101 $ 73 Changes in fair value recognized in net regulatory assets 28 24 Net gains reclassified to operating revenue 7 12 Net losses reclassified to energy costs (14 ) (6 ) Ending balance $ 122 $ 103 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 (in millions): Unit of March 31, December 31, Measure 2018 2017 Electricity (sales) Megawatt hours (6 ) (9 ) Natural gas purchases Decatherms 115 113 Fuel oil purchases Gallons 7 — 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," or in some cases terminate the contract, in the event of a material adverse change in PacifiCorp's creditworthiness. These rights can vary by contract and by counterparty. As of March 31, 2018 , PacifiCorp's credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of PacifiCorp's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $129 million and $110 million as of March 31, 2018 and December 31, 2017 , respectively, for which PacifiCorp had posted collateral of $77 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 March 31, 2018 and December 31, 2017 , PacifiCorp would have been required to post $48 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

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	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 financial 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 March 31, 2018 Assets: Commodity derivatives $ 1 $ 36 $ 98 $ (27 ) $ 108 Interest rate derivatives — 17 16 — 33 Mortgage loans held for sale — 440 — — 440 Money market mutual funds (2) 413 — — — 413 Debt securities: United States government obligations 183 — — — 183 International government obligations — 4 — — 4 Corporate obligations — 37 — — 37 Municipal obligations — 1 — — 1 Equity securities: United States companies 278 — — — 278 International companies 1,760 — — — 1,760 Investment funds 185 — — — 185 $ 2,820 $ 535 $ 114 $ (27 ) $ 3,442 Liabilities: Commodity derivatives $ — $ (191 ) $ (17 ) $ 111 $ (97 ) Interest rate derivatives — (8 ) — — (8 ) $ — $ (199 ) $ (17 ) $ 111 $ (105 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total 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 $84 million and $76 million as of March 31, 2018 and December 31, 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 (in millions): Three-Month Periods Ended March 31, Interest Commodity Rate Derivatives Derivatives 2018: Beginning balance $ 94 $ 9 Changes included in earnings — 30 Changes in fair value recognized in OCI (1 ) — Changes in fair value recognized in net regulatory assets (9 ) — Purchases 1 — Settlements (4 ) (23 ) Ending balance $ 81 $ 16 2017: Beginning balance $ 60 $ 6 Changes included in earnings 12 27 Changes in fair value recognized in OCI (2 ) — Changes in fair value recognized in net regulatory assets 1 — Purchases — (2 ) Settlements 1 (22 ) Ending balance $ 72 $ 9 The Company's long-term debt is carried at cost on the Consolidated Balance Sheets. 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 37,498 $ 41,579 $ 35,193 $ 40,522
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	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 financial 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 March 31, 2018 Assets: Commodity derivatives $ — $ 12 $ — $ (6 ) $ 6 Money market mutual funds (2) 12 — — — 12 Investment funds 24 — — — 24 $ 36 $ 12 $ — $ (6 ) $ 42 Liabilities - Commodity derivatives $ — $ (137 ) $ — $ 83 $ (54 ) 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 $77 million and $74 million as of March 31, 2018 and December 31, 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 six 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 six 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 9 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. 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 6,919 $ 8,007 $ 7,005 $ 8,370
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	air 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 financial 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 March 31, 2018: Assets: Commodity derivatives $ — $ 1 $ 1 $ (1 ) $ 1 Money market mutual funds (2) 106 — — — 106 Debt securities: United States government obligations 183 — — — 183 International government obligations — 4 — — 4 Corporate obligations — 37 — — 37 Municipal obligations — 1 — — 1 Equity securities: United States companies 278 — — — 278 International companies 6 — — — 6 Investment funds 20 — — — 20 $ 593 $ 43 $ 1 $ (1 ) $ 636 Liabilities - commodity derivatives $ — $ (7 ) $ (1 ) $ 1 $ (7 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total 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 March 31, 2018 and December 31, 2017 , respectively. (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. 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. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which MidAmerican Energy transacts. When quoted prices for identical contracts are not available, MidAmerican Energy uses forward price curves. Forward price curves represent MidAmerican Energy's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. MidAmerican Energy 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 MidAmerican Energy. Market price quotations are generally readily obtainable for the applicable term of MidAmerican Energy's outstanding derivative contracts; therefore, MidAmerican Energy'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, MidAmerican Energy 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, related volatility, counterparty creditworthiness and duration of contracts. MidAmerican Energy'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 MidAmerican Energy's commodity derivative assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ 3 $ (2 ) Changes in fair value recognized in net regulatory assets (2 ) 2 Settlements (1 ) 1 Ending balance $ — $ 1 MidAmerican Energy's long-term debt is carried at cost on the Balance Sheets. 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,379 $ 5,793 $ 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	Fair Value Measurements Refer to Note 9 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,619 $ 6,100 $ 5,282 $ 6,006
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	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 March 31, 2018 Assets: Money market mutual funds (1) $ 91 $ — $ — $ 91 Investment funds 2 — — 2 $ 93 $ — $ — $ 93 Liabilities - commodity derivatives $ — $ — $ (8 ) $ (8 ) 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 March 31, 2018 and December 31, 2017 , 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 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 commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ (3 ) $ (14 ) Changes in fair value recognized in regulatory assets (5 ) (1 ) Settlements — 1 Ending balance $ (8 ) $ (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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,601 $ 2,999 $ 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	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 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 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 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 March 31, 2018 Assets - money market mutual funds (1) $ 30 $ — $ — $ 30 Liabilities - commodity derivatives $ — $ — $ (2 ) $ (2 ) As of December 31, 2017 Assets - investment funds $ — $ — $ — $ — (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 Sierra Pacific transacts. When quoted prices for identical contracts are not available, Sierra Pacific uses forward price curves. Forward price curves represent Sierra Pacific's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Sierra Pacific 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, Sierra Pacific 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 Sierra Pacific's nonperformance risk on its liabilities, which as of March 31, 2018 and December 31, 2017 , had an immaterial impact to the fair value of its derivative contracts. As such, Sierra Pacific considers its derivative contracts to be valued using Level 3 inputs. Sierra Pacific's investments in money market mutual funds 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. The following table reconciles the beginning and ending balances of Sierra Pacific's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ — $ — Changes in fair value recognized in regulatory assets (2 ) — Ending balance $ (2 ) $ — Sierra Pacific's long-term debt is carried at cost on the Consolidated 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,186 $ 1,120 $ 1,221

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Easements During the three-month period ended March 31, 2018 , MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $283 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. 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. The Company 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 and are described below. Environmental Laws and Regulations The Company is subject to federal, state, local and foreign 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 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 Federal Energy Regulatory Commission ("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 that 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 was determined that dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. On April 6, 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, on September 23, 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 on September 23, 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. On March 15, 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. On April 16, 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. 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. 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]
Loss Contingencies [Line Items]
Commitments and Contingencies	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 Federal Energy Regulatory Commission ("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 that 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 was determined that dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. On April 6 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, on September 23, 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 on September 23, 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. On March 15, 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. On April 16, 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. 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. 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]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Easements During the three-month period ended March 31, 2018 , MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $283 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. 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. 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 March 31, 2018 , has accrued a $10 million liability for refunds under the second complaint of amounts collected under the higher ROE from March 2015 through May 2016. Retail Regulated Rates In December 2017, the 2017 Tax Reform was signed into law, reducing the federal tax rate from 35% to 21% . Accumulated deferred income tax balances were re-measured at the 21% rate and regulatory liabilities increased reflective of the probability of such balances being passed back to customers. MidAmerican Energy has made filings or has been in discussions with each of its state rate regulatory bodies proposing either a reduction in retail rates or rate base for all or a portion of the net benefits of the 2017 Tax Reform for 2018 and beyond. MidAmerican Energy proposed in Iowa, its largest jurisdiction, to reduce customer revenue via a rider mechanism for the impact of the lower statutory rate on current operations, subject to change depending on actual results, and defer as a regulatory liability the amortization of excess deferred income taxes. The Illinois Commerce Commission approved MidAmerican Energy's Illinois tax reform rate reduction tariff on March 21, 2018, and the Iowa Utilities Board approved MidAmerican Energy's Iowa tax reform rate reduction tariff on April 27, 2018. As of March 31, 2018 , $29 million was accrued for the estimated potential refund liability attributable to lower customer rates enabled by the benefits of tax reform effective January 1, 2018.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies 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. Refer to Note 10 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Loss Contingencies [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. 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.
Sierra Pacific Power Company [Member]
Loss Contingencies [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 consolidated financial results.

Revenue from Contracts with Cus

Revenue from Contracts with Customers Revenue from Contracts with Customers (Notes)	3 Months Ended
	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customer	( 11 ) Revenue from Contracts with Customers Adoption 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. 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. Customer Revenue The Company recognizes revenue upon transfer of control of promised goods or services to customers 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. Energy Products and Services A majority of the Company's energy revenue is derived from tariff based sales arrangements approved by various regulatory bodies. 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. Other revenue consists primarily of revenue recognized in accordance with ASC 815, "Derivatives and Hedging", ASC 840, "Leases" and amounts not considered Customer Revenue within ASC 606. 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 March 31, 2018 and December 31, 2017 , trade receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $582 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. 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 14 , for the three-month period ended March 31, 2018 (in millions): PacifiCorp MidAmerican Funding NV Energy Northern Powergrid BHE Pipeline Group BHE Transmission BHE Renewables BHE and Other Total Customer Revenue: Regulated: Retail Electric $ 1,096 $ 386 $ 539 $ — $ — $ — $ — $ — $ 2,021 Retail Gas — 246 40 — — — — — 286 Wholesale 22 93 11 — — — — (1 ) 125 Transmission and distribution 22 16 20 249 — 180 — — 487 Interstate pipeline — — — — 374 — — (41 ) 333 Total Regulated 1,140 741 610 249 374 180 — (42 ) 3,252 Nonregulated — — — 11 — — 117 144 272 Total Customer Revenue 1,140 741 610 260 374 180 117 102 3,524 Other revenue 44 6 7 18 2 — 37 41 155 Total $ 1,184 $ 747 $ 617 $ 278 $ 376 $ 180 $ 154 $ 143 $ 3,679 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 as well as the allocation of the price amongst the separate performance obligations. Other revenue consists primarily of revenue related to the mortgage businesses recognized in accordance with ASC 815, "Derivatives and Hedging", ASC 825, "Financial Instruments" and ASC 860, "Transfers and Servicing." 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. The following table summarizes the Company's real estate services revenue by line of business for the three-month period ended March 31, 2018 (in millions): HomeServices Customer Revenue: Brokerage $ 685 Franchise 15 Total Customer Revenue 700 Other revenue 61 Total $ 761 Contract Assets and Liabilities 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. As of March 31, 2018 and December 31, 2017 , there were no material contract assets or contract liabilities recorded on the Consolidated Balance Sheets. During the three-month period ended March 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 aggregate transaction price allocated to performance obligations that are unsatisfied as of March 31, 2018 , relative to contracts with an original expected duration of more than one year and contain fixed consideration, that is expected to be recognized as revenue for the remaining nine months of 2018 and the years ended December 31, 2019 and thereafter by reportable segment (in millions): 2018 2019 and Thereafter Total BHE Pipeline Group $ 471 $ 4,352 $ 4,823 BHE Transmission 536 — 536 Total $ 1,007 $ 4,352 $ 5,359
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customer	Revenue from Contracts with Customers Adoption 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. Customer Revenue PacifiCorp recognizes revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which the Company 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 bodies. 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 March 31, 2018 and December 31, 2017 , accounts receivable from contracts with customers, net of allowance for doubtful accounts was $552 million and $635 million , respectively, including unbilled revenue of $215 million and $255 million , respectively, and was included in accounts receivables, net on the Consolidated Balance Sheets. 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. The following table summarizes PacifiCorp's revenue by regulated energy, with further disaggregation of regulated energy by customer class, for the three-month period ended March 31, 2018 (in millions): Customer Revenue: Retail: Residential $ 441 Commercial 342 Industrial 269 Other retail 25 Total retail 1,077 Wholesale 22 Transmission 22 Other Customer Revenue 19 Total Customer Revenue 1,140 Other revenue 44 Total operating revenue $ 1,184 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 the PacifiCorp's performance and the customer's payment. As of March 31, 2018 and December 31, 2017 , there were no material contract assets or contract liabilities recorded on the Consolidated Balance Sheets. During the three-month period ended March 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.
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customer	Revenue from Contracts with Customers Adoption 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. 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. Customer Revenue Nevada Power recognizes revenue upon transfer of control of promised goods or services to customers 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 bodies. 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 840, "Leases" and amounts not considered Customer Revenue within ASC 606. 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 March 31, 2018 and December 31, 2017 , accounts receivables, net on the Consolidated Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $97 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. The following table summarizes Nevada Power's revenue by customer class for the three-month period ended March 31, 2018 (in millions): March 31, 2018 Customer Revenue: Retail: Residential $ 193 Commercial 95 Industrial 79 Other 6 Total fully bundled 373 Distribution only service 7 Total retail 380 Wholesale, transmission and other 10 Total Customer Revenue 390 Other revenue 5 Total revenue $ 395 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 March 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 Contracts with Customer	Revenue from Contracts with Customers Adoption 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. 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. Customer Revenue Sierra Pacific recognizes revenue upon transfer of control of promised goods or services to customers 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 Consolidated Statements of Operations. Substantially all of Sierra Pacific's Customer Revenue is derived from tariff based sales arrangements approved by various regulatory bodies. 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 ASC 606. 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 March 31, 2018 and December 31, 2017 , accounts receivables, net on the Consolidated 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. The following table summarizes Sierra Pacific's revenue by customer class, including a reconciliation to Sierra Pacific's reportable segment information included in Note 12 , for the three-month period ended March 31, 2018 (in millions): Electric Gas Total Customer Revenue: Retail: Residential $ 68 $ 26 $ 94 Commercial 57 11 68 Industrial 39 3 42 Other 2 — 2 Total fully bundled 166 40 206 Distribution only service 1 — 1 Total retail 167 40 207 Wholesale, transmission and other 13 — 13 Total Customer Revenue 180 40 220 Other revenue 1 1 2 Total revenue $ 181 $ 41 $ 222 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 March 31, 2018 and December 31, 2017 , there were no contract assets or contract liabilities recorded on the Consolidated Balance Sheets.
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customer	Revenue from Contracts with Customers Adoption 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. Customer Revenue MidAmerican Energy recognizes 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. 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 and, accordingly, they do not impact revenue. Substantially all of MidAmerican Energy's Customer Revenue is derived from tariff-based sales arrangements approved by various regulatory bodies. MidAmerican Energy’s electric wholesale and transmission transactions, including the multi value projects, are substantially with the Midcontinent Independent System Operator, Inc. under its tariffs approved by the Federal Energy Regulatory Commission. These tariff-based revenues 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 MidAmerican Energy has the right to invoice as it corresponds directly with the value to the customer of MidAmerican Energy's performance to date and includes billed and unbilled amounts. As of March 31, 2018 and December 31, 2017 , receivables, net on the Balance Sheets relate substantially to Customer Revenue, including unbilled revenue of $77 million and $89 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. 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 12 , for the three-month period ended March 31, 2018 (in millions): Electric Gas Other Total Customer Revenue: Retail: Residential $ 161 $ 168 $ — $ 329 Commercial 71 62 — 133 Industrial 145 5 — 150 Gas transportation services — 13 — 13 Other retail (1) 10 (6 ) — 4 Total retail 387 242 — 629 Wholesale 62 32 — 94 Multi value transmission projects 15 — — 15 Other Customer Revenue — — 2 2 Total Customer Revenue 464 274 2 740 Other revenue 5 1 — 6 Total operating revenue $ 469 $ 275 $ 2 $ 746 (1) Other retail includes provisions for potential retail rate refunds, for which any actual refunds will be reflected in the applicable customer classes upon resolution of the related regulatory proceeding. Refer to Note 10 for a discussion of regulatory proceedings related to 2017 Tax Reform. 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 March 31, 2017 and December 31, 2017 , 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 Contracts with Customer	Revenue from Contracts with Customers Refer to Note 11 of MidAmerican Energy's Notes to Financial Statements. Additionally, MidAmerican Funding had $1 million of other Accounting Standards Codification Topic 606 revenue for the three-month period ended March 31, 2018 .

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss, Net	3 Months Ended
	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Other Comprehensive Income (Loss), Net The following table shows the change in AOCI attributable to BHE shareholders by each component of OCI, net of applicable income taxes (in millions): Unrecognized Foreign Unrealized Unrealized AOCI Amounts on Currency Gains on Gains (Losses) Attributable Retirement Translation Marketable on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2016 $ (447 ) $ (1,675 ) $ 585 $ 26 $ (1,511 ) Other comprehensive income (loss) 5 87 38 (4 ) 126 Balance, March 31, 2017 $ (442 ) $ (1,588 ) $ 623 $ 22 $ (1,385 ) Balance, December 31, 2017 $ (383 ) $ (1,129 ) $ 1,085 $ 29 $ (398 ) Adoption of ASU 2016-01 — — (1,085 ) — (1,085 ) Other comprehensive income (loss) (3 ) 73 — (2 ) 68 Balance, March 31, 2018 $ (386 ) $ (1,056 ) $ — $ 27 $ (1,415 ) For more information regarding the adoption of ASU 2016-01, refer to Note 5 .

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [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): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: PacifiCorp $ 1,184 $ 1,281 MidAmerican Funding 747 696 NV Energy 617 584 Northern Powergrid 278 245 BHE Pipeline Group 376 315 BHE Transmission 180 166 BHE Renewables 154 144 HomeServices 761 585 BHE and Other (1) 143 150 Total operating revenue $ 4,440 $ 4,166 Three-Month Periods Ended March 31, 2018 2017 Depreciation and amortization: PacifiCorp $ 202 $ 196 MidAmerican Funding 158 117 NV Energy 113 104 Northern Powergrid 63 49 BHE Pipeline Group 42 30 BHE Transmission 62 54 BHE Renewables 64 61 HomeServices 12 12 BHE and Other (1) — (1 ) Total depreciation and amortization $ 716 $ 622 Operating income: PacifiCorp $ 247 $ 339 MidAmerican Funding 79 102 NV Energy 89 98 Northern Powergrid 147 140 BHE Pipeline Group 226 208 BHE Transmission 81 77 BHE Renewables 28 15 HomeServices (8 ) 2 BHE and Other (1) (18 ) (14 ) Total operating income 871 967 Interest expense (466 ) (458 ) Capitalized interest 12 10 Allowance for equity funds 21 17 Interest and dividend income 26 26 Realized and unrealized (loss) gain on marketable securities, net (209 ) 3 Other, net 30 26 Total income before income tax expense and equity income $ 285 $ 591 Interest expense: PacifiCorp $ 96 $ 95 MidAmerican Funding 63 59 NV Energy 58 58 Northern Powergrid 37 31 BHE Pipeline Group 10 12 BHE Transmission 43 41 BHE Renewables 52 50 HomeServices 4 1 BHE and Other (1) 103 111 Total interest expense $ 466 $ 458 Three-Month Periods Ended March 31, 2018 2017 Operating revenue by country: United States $ 3,978 $ 3,747 United Kingdom 277 245 Canada 180 166 Philippines and other 5 8 Total operating revenue by country $ 4,440 $ 4,166 Income before income tax expense and equity income by country: United States $ 118 $ 423 United Kingdom 112 102 Canada 41 42 Philippines and other 14 24 Total income before income tax expense and equity income by country $ 285 $ 591 As of March 31, December 31, 2018 2017 Assets: PacifiCorp $ 22,989 $ 23,086 MidAmerican Funding 18,707 18,444 NV Energy 13,911 13,903 Northern Powergrid 7,897 7,565 BHE Pipeline Group 5,252 5,134 BHE Transmission 8,762 9,009 BHE Renewables 7,790 7,687 HomeServices 2,739 2,722 BHE and Other (1) 2,865 2,658 Total assets $ 90,912 $ 90,208 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate principally to other entities, corporate functions and intersegment eliminations. The following table shows the change in the carrying amount of goodwill by reportable segment for the three-month period ended March 31, 2018 (in millions): BHE Pipeline Group MidAmerican Funding NV Energy Northern Powergrid BHE Transmission BHE Renewables HomeServices PacifiCorp Total December 31, 2017 $ 1,129 $ 2,102 $ 2,369 $ 991 $ 73 $ 1,571 $ 95 $ 1,348 $ 9,678 Foreign currency translation — — — 26 — (39 ) — — (13 ) March 31, 2018 $ 1,129 $ 2,102 $ 2,369 $ 1,017 $ 73 $ 1,532 $ 95 $ 1,348 $ 9,665
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information MidAmerican Energy has identified two reportable segments: regulated electric and regulated 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 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 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. The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 469 $ 433 Regulated gas 275 262 Other 2 — Total operating revenue $ 746 $ 695 Operating income: Regulated electric $ 36 $ 63 Regulated gas 43 39 Total operating income $ 79 $ 102 Interest expense (58 ) (53 ) Allowance for borrowed funds 4 2 Allowance for equity funds 10 6 Other, net 9 11 Income before income tax benefit $ 44 $ 68 As of March 31, December 31, Assets: Regulated electric $ 15,254 $ 14,914 Regulated gas 1,323 1,403 Other 3 1 Total assets $ 16,580 $ 16,318
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information MidAmerican Funding has identified two reportable segments: regulated electric and regulated 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 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 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 financial results and assets of nonregulated operations, MHC and MidAmerican Funding . The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 469 $ 433 Regulated gas 275 262 Other 3 1 Total operating revenue $ 747 $ 696 Operating income: Regulated electric $ 36 $ 63 Regulated gas 43 39 Total operating income 79 102 Interest expense (63 ) (59 ) Allowance for borrowed funds 4 2 Allowance for equity funds 10 6 Other, net 10 11 Income before income tax benefit $ 40 $ 62 As of March 31, December 31, Assets (1) : Regulated electric $ 16,445 $ 16,105 Regulated gas 1,402 1,482 Other 32 34 Total assets $ 17,879 $ 17,621 (1) Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [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): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 181 $ 159 Regulated gas 41 34 Total operating revenue $ 222 $ 193 Operating income: Regulated electric $ 37 $ 36 Regulated gas 10 10 Total operating income 47 46 Interest expense (10 ) (11 ) Allowance for equity funds 1 1 Other, net 2 1 Income before income tax expense $ 40 $ 37 As of March 31, December 31, 2018 2017 Assets: Regulated electric $ 3,092 $ 3,103 Regulated gas 307 300 Regulated common assets (1) 40 10 Total assets $ 3,439 $ 3,413 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

BHE Shareholders' Equity (Notes

BHE Shareholders' Equity (Notes)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	( 12 ) BHE Shareholders' Equity Common Stock In March 2018, BHE repurchased from certain family interests of Mr. Walter Scott, Jr. 149,281 shares of its common stock for $90 million . In February 2017, BHE repurchased from certain family interests of Mr. Walter Scott, Jr. 35,000 shares of its common stock for $19 million .

Cash and Cash Equivalents and55

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Policies)	3 Months Ended
	Mar. 31, 2018
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash and Cash Equivalents, Policy [Policy Text Block]	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 March 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.
MidAmerican Energy Company [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]	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 March 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.

Investments and Restricted Ca56

Investments and Restricted Cash and Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Investments and Restricted Cash and Investments [Abstract]
Investments and Restricted Cash and Investments	Investments and restricted cash and cash equivalents and investments consists of the following (in millions): As of March 31, December 31, 2018 2017 Investments: BYD Company Limited common stock $ 1,754 $ 1,961 Rabbi trusts 387 441 Other 183 124 Total investments 2,324 2,526 Equity method investments: BHE Renewables tax equity investments 1,177 1,025 Electric Transmission Texas, LLC 536 524 Bridger Coal Company 129 137 Other 143 148 Total equity method investments 1,985 1,834 Restricted cash and cash equivalents and investments: Quad Cities Station nuclear decommissioning trust funds 512 515 Restricted cash and cash equivalents 232 348 Total restricted cash and cash equivalents and investments 744 863 Total investments and restricted cash and cash equivalents and investments $ 5,053 $ 5,223 Reflected as: Current assets $ 257 $ 351 Noncurrent assets 4,796 4,872 Total investments and restricted cash and cash equivalents and investments $ 5,053 $ 5,223
Unrealized Gain (Loss) on Investments [Table Text Block]	The portion of unrealized losses for the three-month period ended March 31, 2018 related to investments still held as of March 31, 2018 is calculated as follows (in millions): Realized and unrealized losses on marketable securities recognized during the period $ (209 ) Less: Net gains recognized during the period on investments sold during the period 2 Unrealized losses recognized during the period on investments still held at the reporting date $ (211 )

Property, Plant and Equipment57

Property, Plant and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment, net consists of the following (in millions): As of Depreciable March 31, December 31, Life 2018 2017 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 75,068 $ 74,660 Interstate natural gas pipeline assets 3-80 years 7,230 7,176 82,298 81,836 Accumulated depreciation and amortization (24,957 ) (24,478 ) Regulated assets, net 57,341 57,358 Nonregulated assets: Independent power plants 5-30 years 6,034 6,010 Other assets 3-30 years 1,588 1,489 7,622 7,499 Accumulated depreciation and amortization (1,644 ) (1,542 ) Nonregulated assets, net 5,978 5,957 Net operating assets 63,319 63,315 Construction work-in-progress 2,735 2,556 Property, plant and equipment, net $ 66,054 $ 65,871
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of March 31, December 31, Depreciable Life 2018 2017 Utility plant in service, net: Generation 20-70 years $ 12,108 $ 12,107 Transmission 52-75 years 1,844 1,838 Electric distribution 20-75 years 3,418 3,380 Gas distribution 29-75 years 1,652 1,640 Utility plant in service 19,022 18,965 Accumulated depreciation and amortization (5,670 ) (5,561 ) Utility plant in service, net 13,352 13,404 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 13,358 13,410 Construction work-in-progress 910 797 Property, plant and equipment, net $ 14,268 $ 14,207
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of March 31, December 31, Depreciable Life 2018 2017 Utility Plant: Utility plant in-service 5-75 years $ 27,947 $ 27,880 Accumulated depreciation and amortization (9,503 ) (9,366 ) Utility plant in-service, net 18,444 18,514 Other non-regulated, net of accumulated depreciation and amortization 45 years 11 11 Plant, net 18,455 18,525 Construction work-in-progress 735 678 Property, plant and equipment, net $ 19,190 $ 19,203
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life March 31, December 31, 2018 2017 Utility plant: Generation 30 - 55 years $ 3,707 $ 3,707 Distribution 20 - 65 years 3,329 3,314 Transmission 45 - 70 years 1,864 1,860 General and intangible plant 5 - 65 years 805 793 Utility plant 9,705 9,674 Accumulated depreciation and amortization (2,930 ) (2,871 ) Utility plant, net 6,775 6,803 Other non-regulated, net of accumulated depreciation and amortization 45 years 2 1 Plant, net 6,777 6,804 Construction work-in-progress 78 73 Property, plant and equipment, net $ 6,855 $ 6,877
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life March 31, December 31, 2018 2017 Utility plant: Electric generation 25 - 60 years $ 1,143 $ 1,144 Electric distribution 20 - 100 years 1,470 1,459 Electric transmission 50 - 100 years 791 786 Electric general and intangible plant 5 - 70 years 181 181 Natural gas distribution 35 - 70 years 390 390 Natural gas general and intangible plant 5 - 70 years 14 14 Common general 5 - 70 years 296 294 Utility plant 4,285 4,268 Accumulated depreciation and amortization (1,531 ) (1,513 ) Utility plant, net 2,754 2,755 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,759 2,760 Construction work-in-progress 142 132 Property, plant and equipment, net $ 2,901 $ 2,892

Cash and Cash Equivalents and58

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Tables)	3 Months Ended
	Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	Cash and Cash Equivalents and Restricted Cash and Cash Equivalents 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. The Company adopted this guidance January 1, 2018. 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 March 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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 1,644 $ 935 Restricted cash and cash equivalents 212 327 Investments and restricted cash and cash equivalents and investments 20 21 Total cash and cash equivalents and restricted cash and cash equivalents $ 1,876 $ 1,283 A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 97 $ 57 Restricted cash and cash equivalents included in other current assets 10 9 Total cash and cash equivalents and restricted cash and cash equivalents $ 107 $ 66 A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 32 $ 4 Restricted cash and cash equivalents included in other current assets 6 4 Total cash and cash equivalents and restricted cash and cash equivalents $ 38 $ 8
PacifiCorp [Member]
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 March 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 March 31, December 31, 2018 2017 Cash and cash equivalents $ 17 $ 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 $ 32 $ 29
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 March 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 March 31, 2018 December 31, 2017 Cash and cash equivalents $ 380 $ 172 Restricted cash and cash equivalents in other current assets 98 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 478 $ 282
MidAmerican Energy Company [Member]
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 March 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 March 31, 2018 December 31, 2017 Cash and cash equivalents $ 380 $ 172 Restricted cash and cash equivalents in other current assets 98 110 Total cash and cash equivalents and restricted cash and cash equivalents $ 478 $ 282

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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, the one-time repatriation tax of foreign earnings and profits and limitations on bonus depreciation for utility property. 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 has recorded the impacts of the 2017 Tax Reform and believes 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 has 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 believes the estimates for the repatriation tax to be reasonable, however, additional time is required to validate the inputs to the foreign earnings and profits calculation, the basis on which the repatriation tax is determined, and additional guidance is required to determine state income tax implications. The Company also believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified, estimates may change. The accounting is estimated to be completed by December 2018. During the three-month period ended March 31, 2018 , the Company reduced the liability estimate by $25 million based on additional guidance for certain state income tax implications of the repatriation tax. The accounting is estimated to be completed by December 2018. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (45 ) (16 ) State income tax, net of federal income tax benefit (30 ) (5 ) Income tax effect of foreign income (16 ) (5 ) Effects of ratemaking (8 ) (1 ) Equity income 1 1 Other (1 ) — Effective income tax rate (78 )% 9 % The effective tax rate decreased primarily due to the reduction in the United States federal corporate income tax rate from 35% to 21% , effective January 1, 2018, lower consolidated state income tax expense, lower United States income taxes on foreign earnings, higher production tax credits recognized of $29 million and the favorable impacts of rate making. 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. Berkshire Hathaway includes the Company in its United States federal income tax return. The Company's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable federal income taxes are remitted to or received from Berkshire Hathaway . For the three-month periods ended March 31, 2018 and 2017 , the Company did not receive or make any cash payments for federal income taxes from or to Berkshire Hathaway .
Schedule of Effective Income Tax Rate Reconciliation	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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (45 ) (16 ) State income tax, net of federal income tax benefit (30 ) (5 ) Income tax effect of foreign income (16 ) (5 ) Effects of ratemaking (8 ) (1 ) Equity income 1 1 Other (1 ) — Effective income tax rate (78 )% 9 %
Nevada Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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, the elimination of the deduction for production activities and limitations on bonus depreciation for utility property. In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 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 has recorded the impacts of the 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. Nevada Power has determined the amounts recorded and the interpretations relating to this items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Nevada Power believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018.
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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, the elimination of the deduction for production activities and limitations on bonus depreciation for utility property. In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 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 has recorded the impacts of the 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. Sierra Pacific has determined the amounts recorded and the interpretations relating to this items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Sierra Pacific believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Effects of ratemaking (5 ) — Other (1 ) — Effective income tax rate 15 % 35 %
Schedule of Effective Income Tax Rate Reconciliation	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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Effects of ratemaking (5 ) — Other (1 ) — Effective income tax rate 15 % 35 %
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act 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. 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. PacifiCorp has recorded the impacts of the 2017 Tax Reform and believes all the impacts to be complete with the exception of the interpretations of the bonus depreciation rules. PacifiCorp has 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 believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. During the three-month period ended March 31, 2018 , PacifiCorp did not make any revisions to its previous calculations. 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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % State income tax, net of federal income tax benefit 4 3 Federal income tax credits (5 ) (5 ) Effects of ratemaking (4 ) 1 Other (2 ) (2 ) Effective income tax rate 14 % 32 % 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. Berkshire Hathaway includes PacifiCorp in its United States federal income tax return. PacifiCorp's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable federal income taxes are remitted to or received from Berkshire Hathaway Energy Company. For the three-month periods ended March 31, 2018 and 2017 , PacifiCorp did not receive or make any cash payments for federal income taxes from or to Berkshire Hathaway Energy Company.
Schedule of Effective Income Tax Rate Reconciliation	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: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % State income tax, net of federal income tax benefit 4 3 Federal income tax credits (5 ) (5 ) Effects of ratemaking (4 ) 1 Other (2 ) (2 ) Effective income tax rate 14 % 32 %
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes Tax Cuts and Jobs Act The Tax Cuts and Jobs Act ("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. 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. MidAmerican Energy has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Energy has 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 believes its interpretations for bonus depreciation to be reasonable; however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. A reconciliation of the federal statutory income tax rate to MidAmerican Energy 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (137 ) (80 ) State income tax, net of federal income tax benefit (9 ) 2 Effects of ratemaking (18 ) (12 ) Other, net 2 1 Effective income tax rate (141 )% (54 )% Income tax credits relate primarily to production tax credits from 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. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Energy 's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Energy received net cash payments for income taxes from BHE totaling $14 million and $- million for the three-month periods ended March 31, 2018 and 2017 , respectively.
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory income tax rate to MidAmerican Energy 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (137 ) (80 ) State income tax, net of federal income tax benefit (9 ) 2 Effects of ratemaking (18 ) (12 ) Other, net 2 1 Effective income tax rate (141 )% (54 )%
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Disclosure [Text Block]	Income Taxes The Tax Cuts and Jobs Act ("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. 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. MidAmerican Funding has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. MidAmerican Funding has 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 believes its interpretations for bonus depreciation to be reasonable; however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. A reconciliation of the federal statutory income tax rate to MidAmerican Funding 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (151 ) (87 ) State income tax, net of federal income tax benefit (10 ) 2 Effects of ratemaking (20 ) (13 ) Other, net 2 (2 ) Effective income tax rate (158 )% (65 )% Income tax credits relate primarily to production tax credits from 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. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Funding 's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis, and substantially all of their currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Funding received net cash payments for income taxes from BHE totaling $14 million and $- million for the three-month periods ended March 31, 2018 and 2017 , respectively.
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory income tax rate to MidAmerican Funding 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Ended March 31, 2018 2017 Federal statutory income tax rate 21 % 35 % Income tax credits (151 ) (87 ) State income tax, net of federal income tax benefit (10 ) 2 Effects of ratemaking (20 ) (13 ) Other, net 2 (2 ) Effective income tax rate (158 )% (65 )%

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Foreign Operations Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Service cost $ 5 $ 6 Interest cost 14 14 Expected return on plan assets (27 ) (24 ) Net amortization 15 17 Net periodic benefit cost $ 7 $ 13 Domestic Operations Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ 5 $ 6 Interest cost 26 29 Expected return on plan assets (41 ) (40 ) Net amortization 8 7 Net periodic benefit cost $ (2 ) $ 2 Other postretirement: Service cost $ 2 $ 2 Interest cost 6 6 Expected return on plan assets (10 ) (10 ) Net amortization (3 ) (3 ) Net periodic benefit credit $ (5 ) $ (5 )
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit (credit) cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ — $ — Interest cost 11 12 Expected return on plan assets (18 ) (18 ) Net amortization 3 4 Net periodic benefit credit $ (4 ) $ (2 ) Other postretirement: Service cost $ — $ 1 Interest cost 3 3 Expected return on plan assets (5 ) (6 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (3 ) $ (3 )
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Ended March 31, 2018 2017 Pension: Service cost $ 2 $ 2 Interest cost 7 8 Expected return on plan assets (11 ) (11 ) Net amortization 1 — Net periodic benefit credit $ (1 ) $ (1 ) Other postretirement: Service cost $ 1 $ 1 Interest cost 2 2 Expected return on plan assets (3 ) (3 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (1 ) $ (1 )
Nevada Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet	Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of March 31, December 31, 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (23 ) $ (23 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (10 ) (10 ) Other Postretirement Plans - Other long-term liabilities 1 1
Sierra Pacific Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet	Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of March 31, December 31, 2018 2017 Qualified Pension Plan - Other long-term liabilities $ (2 ) $ (2 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (8 ) (8 ) Other Postretirement Plans - Other long-term liabilities (20 ) (20 )

Risk Management and Hedging A61

Risk Management and Hedging Activities (Tables) - PacifiCorp [Member]	3 Months Ended
	Mar. 31, 2018
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	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 March 31, 2018 Not designated as hedging contracts (1) : Commodity assets $ 7 $ 2 $ 2 $ 1 $ 12 Commodity liabilities (3 ) — (45 ) (89 ) (137 ) Total 4 2 (43 ) (88 ) (125 ) Total derivatives 4 2 (43 ) (88 ) (125 ) Cash collateral receivable — — 19 58 77 Total derivatives - net basis $ 4 $ 2 $ (24 ) $ (30 ) $ (48 ) 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 March 31, 2018 and December 31, 2017 , a regulatory asset of $122 million and $101 million , respectively, was recorded related to the net derivative liability of $125 million and $104 million , respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts	The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ 101 $ 73 Changes in fair value recognized in net regulatory assets 28 24 Net gains reclassified to operating revenue 7 12 Net losses reclassified to energy costs (14 ) (6 ) Ending balance $ 122 $ 103
Schedule of Notional Amounts of Outstanding Derivative Positions	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 (in millions): Unit of March 31, December 31, Measure 2018 2017 Electricity (sales) Megawatt hours (6 ) (9 ) Natural gas purchases Decatherms 115 113 Fuel oil purchases Gallons 7 —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the Company's financial 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 March 31, 2018 Assets: Commodity derivatives $ 1 $ 36 $ 98 $ (27 ) $ 108 Interest rate derivatives — 17 16 — 33 Mortgage loans held for sale — 440 — — 440 Money market mutual funds (2) 413 — — — 413 Debt securities: United States government obligations 183 — — — 183 International government obligations — 4 — — 4 Corporate obligations — 37 — — 37 Municipal obligations — 1 — — 1 Equity securities: United States companies 278 — — — 278 International companies 1,760 — — — 1,760 Investment funds 185 — — — 185 $ 2,820 $ 535 $ 114 $ (27 ) $ 3,442 Liabilities: Commodity derivatives $ — $ (191 ) $ (17 ) $ 111 $ (97 ) Interest rate derivatives — (8 ) — — (8 ) $ — $ (199 ) $ (17 ) $ 111 $ (105 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total 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 $84 million and $76 million as of March 31, 2018 and December 31, 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 Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation	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 (in millions): Three-Month Periods Ended March 31, Interest Commodity Rate Derivatives Derivatives 2018: Beginning balance $ 94 $ 9 Changes included in earnings — 30 Changes in fair value recognized in OCI (1 ) — Changes in fair value recognized in net regulatory assets (9 ) — Purchases 1 — Settlements (4 ) (23 ) Ending balance $ 81 $ 16 2017: Beginning balance $ 60 $ 6 Changes included in earnings 12 27 Changes in fair value recognized in OCI (2 ) — Changes in fair value recognized in net regulatory assets 1 — Purchases — (2 ) Settlements 1 (22 ) Ending balance $ 72 $ 9
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 37,498 $ 41,579 $ 35,193 $ 40,522
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	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 March 31, 2018 Assets: Money market mutual funds (1) $ 91 $ — $ — $ 91 Investment funds 2 — — 2 $ 93 $ — $ — $ 93 Liabilities - commodity derivatives $ — $ — $ (8 ) $ (8 ) 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	The following table reconciles the beginning and ending balances of Nevada Power's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ (3 ) $ (14 ) Changes in fair value recognized in regulatory assets (5 ) (1 ) Settlements — 1 Ending balance $ (8 ) $ (14 )
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of Nevada Power's long‑term debt (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,601 $ 2,999 $ 2,600 $ 3,088
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents PacifiCorp's financial 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 March 31, 2018 Assets: Commodity derivatives $ — $ 12 $ — $ (6 ) $ 6 Money market mutual funds (2) 12 — — — 12 Investment funds 24 — — — 24 $ 36 $ 12 $ — $ (6 ) $ 42 Liabilities - Commodity derivatives $ — $ (137 ) $ — $ 83 $ (54 ) 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 $77 million and $74 million as of March 31, 2018 and December 31, 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	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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 6,919 $ 8,007 $ 7,005 $ 8,370
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents MidAmerican Energy's financial 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 March 31, 2018: Assets: Commodity derivatives $ — $ 1 $ 1 $ (1 ) $ 1 Money market mutual funds (2) 106 — — — 106 Debt securities: United States government obligations 183 — — — 183 International government obligations — 4 — — 4 Corporate obligations — 37 — — 37 Municipal obligations — 1 — — 1 Equity securities: United States companies 278 — — — 278 International companies 6 — — — 6 Investment funds 20 — — — 20 $ 593 $ 43 $ 1 $ (1 ) $ 636 Liabilities - commodity derivatives $ — $ (7 ) $ (1 ) $ 1 $ (7 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total 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 March 31, 2018 and December 31, 2017 , respectively. (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 Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation	The following table reconciles the beginning and ending balances of MidAmerican Energy's commodity derivative assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ 3 $ (2 ) Changes in fair value recognized in net regulatory assets (2 ) 2 Settlements (1 ) 1 Ending balance $ — $ 1
Fair Value, by Balance Sheet Grouping	MidAmerican Energy's long-term debt is carried at cost on the Balance Sheets. 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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,379 $ 5,793 $ 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	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 (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,619 $ 6,100 $ 5,282 $ 6,006
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents Sierra Pacific'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 March 31, 2018 Assets - money market mutual funds (1) $ 30 $ — $ — $ 30 Liabilities - commodity derivatives $ — $ — $ (2 ) $ (2 ) As of December 31, 2017 Assets - investment funds $ — $ — $ — $ — (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	The following table reconciles the beginning and ending balances of Sierra Pacific's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Ended March 31, 2018 2017 Beginning balance $ — $ — Changes in fair value recognized in regulatory assets (2 ) — Ending balance $ (2 ) $ —
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of Sierra Pacific's long-term debt (in millions): As of March 31, 2018 As of December 31, 2017 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,186 $ 1,120 $ 1,221

Revenue from Contracts with C63

Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 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 14 , for the three-month period ended March 31, 2018 (in millions): PacifiCorp MidAmerican Funding NV Energy Northern Powergrid BHE Pipeline Group BHE Transmission BHE Renewables BHE and Other Total Customer Revenue: Regulated: Retail Electric $ 1,096 $ 386 $ 539 $ — $ — $ — $ — $ — $ 2,021 Retail Gas — 246 40 — — — — — 286 Wholesale 22 93 11 — — — — (1 ) 125 Transmission and distribution 22 16 20 249 — 180 — — 487 Interstate pipeline — — — — 374 — — (41 ) 333 Total Regulated 1,140 741 610 249 374 180 — (42 ) 3,252 Nonregulated — — — 11 — — 117 144 272 Total Customer Revenue 1,140 741 610 260 374 180 117 102 3,524 Other revenue 44 6 7 18 2 — 37 41 155 Total $ 1,184 $ 747 $ 617 $ 278 $ 376 $ 180 $ 154 $ 143 $ 3,679
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table summarizes the Company's aggregate transaction price allocated to performance obligations that are unsatisfied as of March 31, 2018 , relative to contracts with an original expected duration of more than one year and contain fixed consideration, that is expected to be recognized as revenue for the remaining nine months of 2018 and the years ended December 31, 2019 and thereafter by reportable segment (in millions): 2018 2019 and Thereafter Total BHE Pipeline Group $ 471 $ 4,352 $ 4,823 BHE Transmission 536 — 536 Total $ 1,007 $ 4,352 $ 5,359
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 for the three-month period ended March 31, 2018 (in millions): HomeServices Customer Revenue: Brokerage $ 685 Franchise 15 Total Customer Revenue 700 Other revenue 61 Total $ 761
PacifiCorp [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 three-month period ended March 31, 2018 (in millions): Customer Revenue: Retail: Residential $ 441 Commercial 342 Industrial 269 Other retail 25 Total retail 1,077 Wholesale 22 Transmission 22 Other Customer Revenue 19 Total Customer Revenue 1,140 Other revenue 44 Total operating revenue $ 1,184
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 three-month period ended March 31, 2018 (in millions): March 31, 2018 Customer Revenue: Retail: Residential $ 193 Commercial 95 Industrial 79 Other 6 Total fully bundled 373 Distribution only service 7 Total retail 380 Wholesale, transmission and other 10 Total Customer Revenue 390 Other revenue 5 Total revenue $ 395
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 12 , for the three-month period ended March 31, 2018 (in millions): Electric Gas Total Customer Revenue: Retail: Residential $ 68 $ 26 $ 94 Commercial 57 11 68 Industrial 39 3 42 Other 2 — 2 Total fully bundled 166 40 206 Distribution only service 1 — 1 Total retail 167 40 207 Wholesale, transmission and other 13 — 13 Total Customer Revenue 180 40 220 Other revenue 1 1 2 Total revenue $ 181 $ 41 $ 222
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	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 12 , for the three-month period ended March 31, 2018 (in millions): Electric Gas Other Total Customer Revenue: Retail: Residential $ 161 $ 168 $ — $ 329 Commercial 71 62 — 133 Industrial 145 5 — 150 Gas transportation services — 13 — 13 Other retail (1) 10 (6 ) — 4 Total retail 387 242 — 629 Wholesale 62 32 — 94 Multi value transmission projects 15 — — 15 Other Customer Revenue — — 2 2 Total Customer Revenue 464 274 2 740 Other revenue 5 1 — 6 Total operating revenue $ 469 $ 275 $ 2 $ 746 (1) Other retail includes provisions for potential retail rate refunds, for which any actual refunds will be reflected in the applicable customer classes upon resolution of the related regulatory proceeding. Refer to Note 10 for a discussion of regulatory proceedings related to 2017 Tax Reform.

Components of Accumulated Oth64

Components of Accumulated Other Comprehensive Loss, Net (Tables)	3 Months Ended
	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss, Net	The following table shows the change in AOCI attributable to BHE shareholders by each component of OCI, net of applicable income taxes (in millions): Unrecognized Foreign Unrealized Unrealized AOCI Amounts on Currency Gains on Gains (Losses) Attributable Retirement Translation Marketable on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2016 $ (447 ) $ (1,675 ) $ 585 $ 26 $ (1,511 ) Other comprehensive income (loss) 5 87 38 (4 ) 126 Balance, March 31, 2017 $ (442 ) $ (1,588 ) $ 623 $ 22 $ (1,385 ) Balance, December 31, 2017 $ (383 ) $ (1,129 ) $ 1,085 $ 29 $ (398 ) Adoption of ASU 2016-01 — — (1,085 ) — (1,085 ) Other comprehensive income (loss) (3 ) 73 — (2 ) 68 Balance, March 31, 2018 $ (386 ) $ (1,056 ) $ — $ 27 $ (1,415 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	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): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: PacifiCorp $ 1,184 $ 1,281 MidAmerican Funding 747 696 NV Energy 617 584 Northern Powergrid 278 245 BHE Pipeline Group 376 315 BHE Transmission 180 166 BHE Renewables 154 144 HomeServices 761 585 BHE and Other (1) 143 150 Total operating revenue $ 4,440 $ 4,166 Three-Month Periods Ended March 31, 2018 2017 Depreciation and amortization: PacifiCorp $ 202 $ 196 MidAmerican Funding 158 117 NV Energy 113 104 Northern Powergrid 63 49 BHE Pipeline Group 42 30 BHE Transmission 62 54 BHE Renewables 64 61 HomeServices 12 12 BHE and Other (1) — (1 ) Total depreciation and amortization $ 716 $ 622 Operating income: PacifiCorp $ 247 $ 339 MidAmerican Funding 79 102 NV Energy 89 98 Northern Powergrid 147 140 BHE Pipeline Group 226 208 BHE Transmission 81 77 BHE Renewables 28 15 HomeServices (8 ) 2 BHE and Other (1) (18 ) (14 ) Total operating income 871 967 Interest expense (466 ) (458 ) Capitalized interest 12 10 Allowance for equity funds 21 17 Interest and dividend income 26 26 Realized and unrealized (loss) gain on marketable securities, net (209 ) 3 Other, net 30 26 Total income before income tax expense and equity income $ 285 $ 591 Interest expense: PacifiCorp $ 96 $ 95 MidAmerican Funding 63 59 NV Energy 58 58 Northern Powergrid 37 31 BHE Pipeline Group 10 12 BHE Transmission 43 41 BHE Renewables 52 50 HomeServices 4 1 BHE and Other (1) 103 111 Total interest expense $ 466 $ 458 Three-Month Periods Ended March 31, 2018 2017 Operating revenue by country: United States $ 3,978 $ 3,747 United Kingdom 277 245 Canada 180 166 Philippines and other 5 8 Total operating revenue by country $ 4,440 $ 4,166 Income before income tax expense and equity income by country: United States $ 118 $ 423 United Kingdom 112 102 Canada 41 42 Philippines and other 14 24 Total income before income tax expense and equity income by country $ 285 $ 591 As of March 31, December 31, 2018 2017 Assets: PacifiCorp $ 22,989 $ 23,086 MidAmerican Funding 18,707 18,444 NV Energy 13,911 13,903 Northern Powergrid 7,897 7,565 BHE Pipeline Group 5,252 5,134 BHE Transmission 8,762 9,009 BHE Renewables 7,790 7,687 HomeServices 2,739 2,722 BHE and Other (1) 2,865 2,658 Total assets $ 90,912 $ 90,208 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate principally to other entities, corporate functions and intersegment eliminations. T
Schedule of Goodwill	e following table shows the change in the carrying amount of goodwill by reportable segment for the three-month period ended March 31, 2018 (in millions): BHE Pipeline Group MidAmerican Funding NV Energy Northern Powergrid BHE Transmission BHE Renewables HomeServices PacifiCorp Total December 31, 2017 $ 1,129 $ 2,102 $ 2,369 $ 991 $ 73 $ 1,571 $ 95 $ 1,348 $ 9,678 Foreign currency translation — — — 26 — (39 ) — — (13 ) March 31, 2018 $ 1,129 $ 2,102 $ 2,369 $ 1,017 $ 73 $ 1,532 $ 95 $ 1,348 $ 9,665
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 469 $ 433 Regulated gas 275 262 Other 2 — Total operating revenue $ 746 $ 695 Operating income: Regulated electric $ 36 $ 63 Regulated gas 43 39 Total operating income $ 79 $ 102 Interest expense (58 ) (53 ) Allowance for borrowed funds 4 2 Allowance for equity funds 10 6 Other, net 9 11 Income before income tax benefit $ 44 $ 68 As of March 31, December 31, Assets: Regulated electric $ 15,254 $ 14,914 Regulated gas 1,323 1,403 Other 3 1 Total assets $ 16,580 $ 16,318
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 469 $ 433 Regulated gas 275 262 Other 3 1 Total operating revenue $ 747 $ 696 Operating income: Regulated electric $ 36 $ 63 Regulated gas 43 39 Total operating income 79 102 Interest expense (63 ) (59 ) Allowance for borrowed funds 4 2 Allowance for equity funds 10 6 Other, net 10 11 Income before income tax benefit $ 40 $ 62 As of March 31, December 31, Assets (1) : Regulated electric $ 16,445 $ 16,105 Regulated gas 1,402 1,482 Other 32 34 Total assets $ 17,879 $ 17,621 (1) Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2018 2017 Operating revenue: Regulated electric $ 181 $ 159 Regulated gas 41 34 Total operating revenue $ 222 $ 193 Operating income: Regulated electric $ 37 $ 36 Regulated gas 10 10 Total operating income 47 46 Interest expense (10 ) (11 ) Allowance for equity funds 1 1 Other, net 2 1 Income before income tax expense $ 40 $ 37 As of March 31, December 31, 2018 2017 Assets: Regulated electric $ 3,092 $ 3,103 Regulated gas 307 300 Regulated common assets (1) 40 10 Total assets $ 3,439 $ 3,413 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

General (Details)

General (Details)	3 Months Ended
	Mar. 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 interstate natural gas pipeline companies in the United States	2
Number of owned and operated electricity distribution companies in Great Britain	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 residential real estate brokerage franchise networks in the United States	1

New Accounting Pronouncements N

New Accounting Pronouncements New Accounting Pronouncements (Details) - BHE (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0

Business Acquisitions (Details)

Business Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 0	$ (579)
Other acquisitions [Member]
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 579
Subsequent Event [Member] | 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

Investments and Restricted Ca69

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Investments And Restricted Cash And Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0
Investments [Abstract]
Investments	2,324	$ 2,526
Equity Method Investments [Abstract]
Equity method investments	1,985	1,834
Restricted Cash and Investments [Abstract]
Restricted cash and investments	744	863
Investments, including equity method investments and restricted cash and investments	5,053	5,223
Investments, including equity method investments and restricted cash and investments, current	257	351
Investments, including equity method investments and restricted cash and investments, noncurrent	4,796	4,872
Gain on Sale of Investments	(209)
Marketable Securities, Realized Gain (Loss)	2
Marketable Securities, Gain (Loss)	(211)
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	512	515
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	232	348
Equity Method Investments, tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	1,177	1,025
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	536	524
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	129	137
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	143	148
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	1,754	1,961
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	387	441
Other investments [Member]
Investments [Abstract]
Other investments	183	$ 124
Retained Earnings [Member]
Investments And Restricted Cash And Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1,085

Property, Plant and Equipment70

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 63,319	$ 63,315
Construction in Progress, Gross	2,735	2,556
Property, plant and equipment, net	66,054	65,871
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	82,298	81,836
Accumulated depreciation and amortization	(24,957)	(24,478)
Property, plant and equipment in service, net	57,341	57,358
Construction in Progress, Gross	2,400	2,200
Regulated Operation [Member] | Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 75,068	74,660
Regulated Operation [Member] | Utility generation, transmission and distribution systems | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Regulated Operation [Member] | Utility generation, transmission and distribution systems | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Regulated Operation [Member] | Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,230	7,176
Regulated Operation [Member] | Interstate natural gas pipeline assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Regulated Operation [Member] | Interstate natural gas pipeline assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,622	7,499
Accumulated depreciation and amortization	(1,644)	(1,542)
Property, plant and equipment in service, net	5,978	5,957
Unregulated Operation [Member] | Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,034	6,010
Unregulated Operation [Member] | Independent power plants | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Unregulated Operation [Member] | Independent power plants | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Unregulated Operation [Member] | Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,588	$ 1,489
Unregulated Operation [Member] | Other assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Unregulated Operation [Member] | Other assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years

Property, Plant and Equipment71

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 27,947	$ 27,880
Public utility accumulated depreciation and amortization	(9,503)	(9,366)
Public Utilities Property, Plant And Equipment In Service, Net	18,444
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	18,455	18,525
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	735	678
Public Utilities, Property, Plant and Equipment, Net	$ 19,190	19,203
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	75 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 11	11
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress		$ 18,514

Property, Plant and Equipment72

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 13,358	$ 13,410
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	910	797
Property, plant and equipment, net	14,268	14,207
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	19,022	18,965
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,670)	(5,561)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	13,352	13,404
Unregulated Operation [Member]
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
Electric Operations [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	12,108	12,107
Public Utilities, Property, Plant and Equipment, Transmission	1,844	1,838
Public Utilities, Property, Plant and Equipment, Distribution	3,418	3,380
Natural Gas Processing Plant [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,652	$ 1,640

Property, Plant and Equipment73

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24	$ 24
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (10)	$ (10)

Property, Plant and Equipment74

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC(Details) - Nevada Power Company [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,777		$ 6,804
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	78		73
Property, plant and equipment, net	6,855		6,877
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	2
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,707		3,707
Public Utilities, Property, Plant and Equipment, Distribution	3,329		3,314
Public Utilities, Property, Plant and Equipment, Transmission	1,864		1,860
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	805		793
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,705		9,674
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,930		2,871
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,775		6,803
Regulated Operation [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	55 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	65 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2		$ 1
Unregulated Operation [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years
Unregulated Operation [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years
Scenario, Forecast [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods		$ 7

Property, Plant and Equipment75

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,759	$ 2,760
Property, plant and equipment, net	2,901	2,892
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	142	132
Property, plant and equipment, net	2,901	2,892
Regulated Operation [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,143	1,144
Public Utilities, Property, Plant and Equipment, Distribution	1,470	1,459
Public Utilities, Property, Plant and Equipment, Transmission	791	786
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 181	181
Regulated Operation [Member] | Electricity Generation Plant, Non-Nuclear [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	25 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] | Electricity Generation Plant, Non-Nuclear [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	100 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	100 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Regulated Operation [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 390	390
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 14	14
Regulated Operation [Member] | Natural Gas Processing Plant [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	35 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] | Natural Gas Processing Plant [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Regulated Operation [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	$ 296	294
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,285	4,268
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,531	1,513
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,754	2,755
Regulated Operation [Member] | Common Facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years
Regulated Operation [Member] | Common Facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	70 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 5	$ 5
Unregulated Operation [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Unregulated Operation [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years

Regulatory Matters - PAC (Detai

Regulatory Matters - PAC (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			12 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%	35.00%	35.00%
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%	35.00%	35.00%
Public Utilities, Requested Rate Increase (Decrease), Percentage		1.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Loss Contingency, Accrual, Current		$ 53		$ 53
Subsequent Event [Member] | PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 61
Scenario, Forecast [Member] | PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage			3.00%

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters - NPC (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%		35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		35.00%
Nevada Power Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Caesars Entertainment Corporation [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee	$ 44,000,000
Nevada Power Company [Member] | General Rate Case [Member] | Public Utilities Commission, Nevada [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Filed 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				$ 28,000,000
Scenario, Forecast [Member] | Nevada Power Company [Member] | Tax Rate Reduction Rider [Member] | Public Utilities Commission, Nevada [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 59,000,000

Regulatory Matters Regulatory78

Regulatory Matters Regulatory Matters - SPPC (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%		35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%		35.00%
Sierra Pacific Power Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%
Sierra Pacific Power Company [Member] | Public Utilities Commission, Nevada [Member] | Caesars Entertainment Corporation [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee		$ 4
Sierra Pacific Power Company [Member] | Subsequent Event [Member] | Public Utilities Commission, Nevada [Member] | Peppermill Resort Spa Casino [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee	$ 3
Scenario, Forecast [Member] | Sierra Pacific Power Company [Member] | Public Utilities Commission, Nevada [Member] | Tax Rate Reduction Rider [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 25

Cash and Cash Equivalents and79

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644	$ 935
Restricted cash and cash equivalents	212	327
Restricted Cash and Cash Equivalents, Noncurrent	20	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,876	$ 1,283	$ 1,232	$ 1,003

Cash and Cash Equivalents and80

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - MEC (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644,000,000	$ 935,000,000
Restricted cash and cash equivalents	212,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876,000,000	1,283,000,000	$ 1,232,000,000	$ 1,003,000,000
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	380,000,000	172,000,000
Restricted cash and cash equivalents	98,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 478,000,000	$ 282,000,000	$ 491,000,000	$ 26,000,000

Cash and Cash Equivalents and81

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - LLC (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644,000,000	$ 935,000,000
Restricted cash and cash equivalents	212,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876,000,000	1,283,000,000	$ 1,232,000,000	$ 1,003,000,000
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	380,000,000	172,000,000
Restricted cash and cash equivalents	98,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 478,000,000	$ 282,000,000	$ 492,000,000	$ 27,000,000

Cash and Cash Equivalents and82

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - Pacificorp (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644	$ 935
Restricted cash and cash equivalents	212	327
Restricted Cash and Cash Equivalents, Noncurrent	20	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,283	$ 1,232	$ 1,003
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	17	14
Restricted cash and cash equivalents	13	13
Restricted Cash and Cash Equivalents, Noncurrent	2	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 32	$ 29	$ 30	$ 33

Cash and Cash Equivalents and83

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - NPC (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644	$ 935
Restricted cash and cash equivalents	212	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,283	$ 1,232	$ 1,003
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	97	57
Restricted cash and cash equivalents	10	9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 107	$ 66	$ 91	$ 290

Cash and Cash Equivalents and84

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - SPPC (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,644	$ 935
Restricted cash and cash equivalents	212	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,283	$ 1,232	$ 1,003
Sierra Pacific Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	32	4
Restricted cash and cash equivalents	6	4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 38	$ 8	$ 10	$ 60

Recent Financing Transactions R

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700
Debt Instrument, Interest Rate, Stated Percentage		3.65%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.375%, due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 450
Debt Instrument, Interest Rate, Stated Percentage			2.375%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.800%, due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 400
Debt Instrument, Interest Rate, Stated Percentage			2.80%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.250%, due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 600
Debt Instrument, Interest Rate, Stated Percentage			3.25%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.80%, due 2048 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 750
Debt Instrument, Interest Rate, Stated Percentage			3.80%
Subsequent Event [Member] | NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series BB [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 575
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Subsequent Event [Member] | NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series O [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 325
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Subsequent Event [Member] | NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	6.50%

Recent Financing Transactions86

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Apr. 30, 2018 - Subsequent Event [Member] - Line of Credit [Member] $ in Millions, $ in Millions	USD ($)	CAD ($)
Unsecured credit facility, $2 billion, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 2,000
Unsecured credit facility, $3.5 billion, expiring June 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,500
Unsecured credit facility, $1 billion, expiring May 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	1,000
Secured credit facility, C$750 million, expiring December 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		$ 750
Secured credit facility, C$500 million, expiring December 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		500
Secured credit facility, C$75 million, expiring December 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 75
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2021 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	250
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring March 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900
PacifiCorp [Member] | Unsecured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	400
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600
Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400

Recent Financing Transactions87

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Mar. 31, 2018	Feb. 28, 2018
MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700
Debt Instrument, Interest Rate, Stated Percentage		3.65%
MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Debt Instrument, Repurchased Face Amount	$ 350

Recent Financing Transactions88

Recent Financing Transactions Recent Financing Transactions - NPC (Details) - Nevada Power Company [Member] - Subsequent Event [Member] $ in Millions	Apr. 30, 2018USD ($)
Line of Credit [Member] | Secured credit facility, $400 million, expiring June 2021 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
NVE Holdings [Member] | NPC General and Refunding Mortgage Notes, Series BB [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 575
Debt Instrument, Interest Rate, Stated Percentage	2.75%
NVE Holdings [Member] | NPC General and Refunding Mortgage Notes, Series O [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 325
Debt Instrument, Interest Rate, Stated Percentage	6.50%
NVE Holdings [Member] | NPC General and Refunding Mortgage Notes, Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	6.50%

Recent Financing Transactions89

Recent Financing Transactions Recent Financing Transactions - SPPC (Details) $ in Millions	Apr. 30, 2018USD ($)
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2021 [Domain] | Line of Credit [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(45.00%)	(16.00%)
State income tax, net of federal income tax benefit	(30.00%)	(5.00%)
Income tax effect of foreign income	(16.00%)	(5.00%)
Effects of ratemaking	(8.00%)	(1.00%)
Equity income	1.00%	1.00%
Other	(1.00%)	(0.00%)
Effective income tax rate	(78.00%)	9.00%
Recognized production tax credits	$ 29
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Related Party Tax Expense [Abstract]
Related party transaction, cash received for income taxes, net	$ 0	$ 0
Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%
PacifiCorp [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(5.00%)	(5.00%)
State income tax, net of federal income tax benefit	(4.00%)	(3.00%)
Effects of ratemaking	(4.00%)	1.00%
Other	(2.00%)	(2.00%)
Effective income tax rate	(14.00%)	(32.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
PacifiCorp [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%

Income Taxes - PAC (Details)

Income Taxes - PAC (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
State income tax, net of federal income tax benefit	30.00%	5.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(45.00%)	(16.00%)
Effects of ratemaking	(8.00%)	(1.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.00%	0.00%
Effective income tax rate	78.00%	(9.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal 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%
State income tax, net of federal income tax benefit	4.00%	3.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(5.00%)	(5.00%)
Effects of ratemaking	(4.00%)	1.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	2.00%	2.00%
Effective income tax rate	14.00%	32.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal 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%
State income tax, net of federal income tax benefit	(9.00%)	2.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(137.00%)	(80.00%)
Effects of ratemaking	(18.00%)	(12.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(2.00%)	(1.00%)
Effective income tax rate	(141.00%)	(54.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal 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%
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%
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Loss Contingency, Accrual, Current	$ 53
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Loss Contingency, Accrual, Current	$ 29

Income Taxes - MEC (Details)

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(45.00%)	(16.00%)
State income tax, net of federal income tax benefit	30.00%	5.00%
Effects of ratemaking	(8.00%)	(1.00%)
Other	(1.00%)	(0.00%)
Effective income tax rate	78.00%	(9.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net	$ 0	$ 0
Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(137.00%)	(80.00%)
State income tax, net of federal income tax benefit	(9.00%)	2.00%
Effects of ratemaking	(18.00%)	(12.00%)
Other	2.00%	1.00%
Effective income tax rate	(141.00%)	(54.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
MidAmerican Energy Company [Member] | Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net	$ 14	$ 0
MidAmerican Energy Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%

Income Taxes - MidAmerican Fund

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(45.00%)	(16.00%)
State income tax, net of federal income tax benefit	30.00%	5.00%
Effects of ratemaking	(8.00%)	(1.00%)
Other	(1.00%)	(0.00%)
Effective income tax rate	78.00%	(9.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net	$ 0	$ 0
MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(151.00%)	(87.00%)
State income tax, net of federal income tax benefit	(10.00%)	2.00%
Effects of ratemaking	(20.00%)	(13.00%)
Other	2.00%	(2.00%)
Effective income tax rate	(158.00%)	(65.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
MidAmerican Funding, LLC and Subsidiaries [Domain] | Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net	$ 14	$ 0
Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%

Income Taxes Income Taxes - NPC

Income Taxes Income Taxes - NPC (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Nevada Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate		35.00%
Nevada Power Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%

Income Taxes Income Taxes - SPP

Income Taxes Income Taxes - SPPC (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effects of ratemaking	(8.00%)	(1.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.00%	0.00%
Effective income tax rate	78.00%	(9.00%)
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
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%
Effects of ratemaking	5.00%	(0.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	0.00%
Effective income tax rate	15.00%	35.00%
Sierra Pacific Power Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 4
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	$ 2
Interest cost	6	6
Expected return on plan assets	(10)	(10)
Net amortization	(3)	(3)
Net periodic benefit cost	(5)	(5)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	26	29
Expected return on plan assets	(41)	(40)
Net amortization	8	7
Net periodic benefit cost	(2)	2
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	14	14
Expected return on plan assets	(27)	(24)
Net amortization	15	17
Net periodic benefit cost	$ 7	$ 13

Employee Benefit Plans - Employ

Employee Benefit Plans - Employer Contributions (Details) - 3 months ended Mar. 31, 2018 £ in Millions, $ in Millions	USD ($)	GBP (£)	GBP (£)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 4
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	4
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year | £			£ 46
Employer contributions	$ 16	£ 11

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 4
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	$ 2
Interest cost	6	6
Expected return on plan assets	(10)	(10)
Net amortization	(3)	(3)
Net periodic benefit cost	(5)	(5)
PacifiCorp [Member] | Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	6
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	3	3
Expected return on plan assets	5	6
Net amortization	(1)	(1)
Net periodic benefit cost	(3)	(3)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	26	29
Expected return on plan assets	(41)	(40)
Net amortization	8	7
Net periodic benefit cost	(2)	2
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	11	12
Expected return on plan assets	18	18
Net amortization	3	4
Net periodic benefit cost	$ (4)	$ (2)

Employee Benefit Plans Employ99

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 4
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	0
Employer contributions	0
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	4
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	4
Employer contributions	$ 1

Employee Benefit Plans - MEC (D

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 4
Other Pension, Postretirement and Supplemental Plans [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	5
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	$ 6
Interest cost	26	29
Expected return on plan assets	(41)	(40)
Net amortization	8	7
Net periodic benefit cost	(2)	2
Pension Plan [Member] | Domestic Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	7	8
Expected return on plan assets	(11)	(11)
Net amortization	1	0
Net periodic benefit cost	(1)	(1)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	6	6
Expected return on plan assets	(10)	(10)
Net amortization	(3)	(3)
Net periodic benefit cost	(5)	(5)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	2	2
Expected return on plan assets	(3)	(3)
Net amortization	(1)	(1)
Net periodic benefit cost	$ (1)	$ (1)

Employee Benefit Plans Emplo101

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 4
MidAmerican Energy Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	0
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	4
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	$ 2

Employee Benefit Plans - NPC -

Employee Benefit Plans - NPC - Amounts Payable (Details) - Nevada Power Company [Member] - NV Energy, Inc. [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Noncurrent Liabilities [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ 1	$ 1
Domestic Plan [Member] | Other Noncurrent Liabilities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	23	23
Domestic Plan [Member] | Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	10	10
Domestic Plan [Member] | Other Current Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

Employee Benefit Plans - SPPC -

Employee Benefit Plans - SPPC - Amounts Payable (Details) - Sierra Pacific Power Company [Member] - NV Energy, Inc. [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Noncurrent Liabilities [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ 20	$ 20
Domestic Plan [Member] | Other Noncurrent Liabilities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	2	2
Domestic Plan [Member] | Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	8	8
Domestic Plan [Member] | Other Current Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

Risk Management and Hedging 104

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (125)	$ (104)
Cash collateral, net receivable, offset against derivative positions	77	74
Derivative assets (liabilities), at fair value, net	(48)	(30)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	4	8
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	4	8
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	2	1
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	2	1
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(43)	(31)
Cash collateral, net receivable, offset against derivative positions	19	17
Derivative assets (liabilities), at fair value, net	(24)	(14)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(88)	(82)
Cash collateral, net receivable, offset against derivative positions	58	57
Derivative assets (liabilities), at fair value, net	(30)	(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	12	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(137)	(117)
Derivative, fair value, net	(125)	(104)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	122	101	$ 103	$ 73
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	7	11
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(3)	(3)
Derivative, fair value, net	4	8
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	2	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
Derivative, fair value, net	2	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	2	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(45)	(32)
Derivative, fair value, net	(43)	(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	(89)	(82)
Derivative, fair value, net	$ (88)	$ (82)

Risk Management and Hedging 105

Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - PacifiCorp [Member] - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 101	$ 73
Changes in fair value recognized in net regulatory assets	28	24
Net (losses) gains reclassified to operating revenue	7	12
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(14)	(6)
Ending balance	$ 122	$ 103

Risk Management and Hedging 106

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - PacifiCorp [Member] - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Mar. 31, 2018galDthMWh	Dec. 31, 2017galDthMWh
Electricity purchases (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	(115)	(113)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	(7)	0

Risk Management and Hedging 107

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 129	$ 110
Collateral already posted, aggregate fair value	77	74
Additional collateral, aggregate fair value	$ 48	$ 34

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
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	$ (27)		$ (29)
Assets, fair value disclosure	3,442		3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	111		105
Derivative liabilities	(105)		(83)
Cash collateral, net receivable, offset against derivative positions	84		76
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,820		3,296
Derivative liabilities	0		(3)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	535		565
Derivative liabilities	(199)		(175)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	114		113
Derivative liabilities	(17)		(10)
Mortgage Loans on Real Estate [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	440		465
Mortgage Loans on Real Estate [Member] | Recurring [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 on Real Estate [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	440		465
Mortgage Loans on Real Estate [Member] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	413		685
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	413		685
Money market mutual funds [Member] | Recurring [Member] | Level 2 [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] | Recurring [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 government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	183		176
United States government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	183		176
United States government obligations [Member] | Recurring [Member] | 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] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4		5
International government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International government obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4		5
International government obligations [Member] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		36
Corporate obligations [Member] | Recurring [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] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		36
Corporate obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Municipal obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		2
Municipal obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Municipal obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		2
Municipal obligations [Member] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	278		288
United States companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	278		288
United States companies [Member] | Recurring [Member] | 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] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,760		1,968
International companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,760		1,968
International companies [Member] | Recurring [Member] | 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] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	185		178
Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	185		178
Investment funds [Member] | Recurring [Member] | 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] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Commodity derivative [Member] | 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	(27)		(29)
Derivative assets	108		118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	111		105
Derivative liabilities	(97)		(75)
Commodity derivative [Member] | Recurring [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	0		(3)
Commodity derivative [Member] | Recurring [Member] | 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	36		42
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(191)		(167)
Commodity derivative [Member] | Recurring [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	98		104
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(17)		(10)
Interest Rate Contract [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	33		24
Derivative liabilities	(8)		(8)
Interest Rate Contract [Member] | Recurring [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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | Recurring [Member] | 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	17		15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(8)		(8)
Interest Rate Contract [Member] | Recurring [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	16		9
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	81	$ 72	94	$ 60
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	(12)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	1	2
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	9	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	4	(1)
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	16	9	$ 9	$ 6
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(30)	(27)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	(2)
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	$ 23	$ 22

Fair Value Measurements - Level

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 94	$ 60
Changes included in earnings	0	12
Changes in fair value recognized in other comprehensive income	(1)	(2)
Changes in fair value recognized in net regulatory assets	(9)	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1	0
Settlements	(4)	1
Ending balance	81	72
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	9	6
Changes included in earnings	30	27
Changes in fair value recognized in other comprehensive income	0	0
Changes in fair value recognized in net regulatory assets	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	(2)
Settlements	(23)	(22)
Ending balance	$ 16	$ 9

Fair Value Measurements - Debt

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,498	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 41,579	$ 40,522

Fair Value Measurements - Pacif

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
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	$ (27)	$ (29)
Assets, fair value disclosure	3,442	3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	111	105
Derivative Liability	(105)	(83)
Cash collateral, net receivable, offset against derivative positions	84	76
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,820	3,296
Derivative Liability	0	(3)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	535	565
Derivative Liability	(199)	(175)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	114	113
Derivative Liability	(17)	(10)
Commodity derivative [Member] | 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	(27)	(29)
Derivative assets	108	118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	111	105
Derivative Liability	(97)	(75)
Commodity derivative [Member] | Recurring [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	0	(3)
Commodity derivative [Member] | Recurring [Member] | 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	36	42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(191)	(167)
Commodity derivative [Member] | Recurring [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	98	104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(17)	(10)
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	413	685
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	413	685
Money market mutual funds [Member] | Recurring [Member] | Level 2 [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] | Recurring [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] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	185	178
Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	185	178
Investment funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
Investment funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
PacifiCorp [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	42	51
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	36	42
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	12	13
PacifiCorp [Member] | Recurring [Member] | 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 derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	77	74
PacifiCorp [Member] | Commodity derivative [Member] | 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	6	4
Derivative assets	6	9
Derivative liability, fair value, gross asset and right to reclaim cash, offset	83	78
Derivative Liability	(54)	(39)
Cash collateral, net receivable, offset against derivative positions	77	74
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [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	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | 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	12	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(137)	(117)
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [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	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	12	21
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	12	21
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	24	21
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	24	21
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0	0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	$ 0	$ 0

Fair Value Measurements - Pa112

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,498	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,579	40,522
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	6,919	7,005
PacifiCorp [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 8,007	$ 8,370

Fair Value Measurements - MEC (

Fair Value Measurements - MEC (Details) - Recurring [Member] - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		$ 84	$ 76
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(27)	(29)
Assets, fair value disclosure		3,442	3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset		111	105
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		413	685
United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		183	176
International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	5
Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		278	288
International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,760	1,968
Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		185	178
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,820	3,296
Level 1 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		413	685
Level 1 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		183	176
Level 1 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 1 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 1 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 1 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		278	288
Level 1 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,760	1,968
Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		185	178
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		535	565
Level 2 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 2 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 2 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	5
Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
Level 2 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 2 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 2 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Trading Securities			0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		114	113
Level 3 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Level 3 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Trading Securities			0
Commodity derivative [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		(27)	(29)
Derivative liability, fair value, gross asset and right to reclaim cash, offset		111	105
Commodity derivative [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		0	(3)
Commodity derivative [Member] | 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		36	42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(191)	(167)
Commodity derivative [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		98	104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(17)	(10)
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		0	0
Assets, fair value disclosure		636	667
MidAmerican Energy Company [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	106	133
MidAmerican Energy Company [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		183	176
MidAmerican Energy Company [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	5
MidAmerican Energy Company [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
MidAmerican Energy Company [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
MidAmerican Energy Company [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		278	288
MidAmerican Energy Company [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		6	7
MidAmerican Energy Company [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		20	15
MidAmerican Energy Company [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		593	619
MidAmerican Energy Company [Member] | Level 1 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	106	133
MidAmerican Energy Company [Member] | Level 1 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		183	176
MidAmerican Energy Company [Member] | Level 1 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 1 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 1 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 1 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		278	288
MidAmerican Energy Company [Member] | Level 1 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		6	7
MidAmerican Energy Company [Member] | Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		20	15
MidAmerican Energy Company [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		43	46
MidAmerican Energy Company [Member] | Level 2 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
MidAmerican Energy Company [Member] | Level 2 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 2 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	5
MidAmerican Energy Company [Member] | Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
MidAmerican Energy Company [Member] | Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
MidAmerican Energy Company [Member] | Level 2 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 2 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 2 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0
MidAmerican Energy Company [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		1	4
MidAmerican Energy Company [Member] | Level 3 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Level 3 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0
MidAmerican Energy Company [Member] | Commodity derivative [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	5
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(1)	(2)
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(7)	(8)
Derivative liability, fair value, gross asset and right to reclaim cash, offset	[2]	1	2
MidAmerican Energy Company [Member] | Commodity derivative [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		0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		1	3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(7)	(9)
MidAmerican Energy Company [Member] | Commodity derivative [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		1	4
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ (1)	$ (1)
[1]	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.
[2]	Represents netting under master netting arrangements and a net cash collateral receivable of $- million as of March 31, 2018 and December 31, 2017, respectively.

Fair Value Measurements - MEC -

Fair Value Measurements - MEC - Level 3 (Details) - Derivative [Member] - MidAmerican Energy Company [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3	$ (2)
Changes in fair value recognized in net regulatory assets	(2)	2
Settlements	(1)	1
Ending balance	$ 0	$ 1

Fair Value Measurements - ME115

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,498	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,579	40,522
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,379	5,042
Long-term debt, fair value		$ 5,686
MidAmerican Energy Company [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,793

Fair Value Measurements - MidAm

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,498	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,579	40,522
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,619	5,282
Long-term debt, fair value		$ 6,006
MidAmerican Funding, LLC and Subsidiaries [Domain] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 6,100

Fair Value Measurements - NPC (

Fair Value Measurements - NPC (Details) - Recurring [Member] - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		$ 3,442	$ 3,945
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,820	3,296
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		535	565
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		114	113
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		413	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		413	685
Money market mutual funds [Member] | Level 2 [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] | 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		185	178
Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		185	178
Investment funds [Member] | 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 derivative [Member] | 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	3
Commodity derivative [Member] | 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		191	167
Commodity derivative [Member] | 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		17	10
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		93
Nevada Power Company [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		93
Nevada Power Company [Member] | 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] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		0
Nevada Power Company [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	91
Nevada Power Company [Member] | 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	[1]	91
Nevada Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0
Nevada Power Company [Member] | 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	[1]	0
Nevada Power Company [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
Nevada Power Company [Member] | Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
Nevada Power Company [Member] | Investment funds [Member] | 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] | 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
Nevada Power Company [Member] | Commodity derivative [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		8	3
Nevada Power Company [Member] | Commodity derivative [Member] | 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	0
Nevada Power Company [Member] | Commodity derivative [Member] | 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		0	0
Nevada Power Company [Member] | Commodity derivative [Member] | 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		$ 8	$ 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 Measurements - NPC -

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (3)	$ (14)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	5	1
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	0	(1)
Ending balance	$ (8)	$ (14)

Fair Value Measurements - NP119

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value		$ 37,498	$ 35,193
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value		1,120	1,120
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value		2,601	2,600
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		41,579	40,522
Level 2 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		1,186	1,221
Level 2 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		2,999	3,088
Recurring [Member] | Money market mutual funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		413	685
Recurring [Member] | Money market mutual funds [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[1]	30
Recurring [Member] | Money market mutual funds [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[2]	91
Recurring [Member] | Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		413	685
Recurring [Member] | Money market mutual funds [Member] | Level 1 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[1]	30
Recurring [Member] | Money market mutual funds [Member] | Level 1 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[2]	91
Recurring [Member] | Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Money market mutual funds [Member] | Level 2 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[1]	0
Recurring [Member] | Money market mutual funds [Member] | Level 2 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[2]	0
Recurring [Member] | Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		0	$ 0
Recurring [Member] | Money market mutual funds [Member] | Level 3 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[1]	0
Recurring [Member] | Money market mutual funds [Member] | Level 3 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	[2]	$ 0
[1]	(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.
[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 Fair Va

Fair Value Measurements Fair Value Measurements - SPPC (Details) - Recurring [Member] - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		$ 3,442	$ 3,945
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,820	3,296
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		535	565
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		114	113
Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		185	178
Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		185	178
Investment funds [Member] | 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
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		413	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		413	685
Money market mutual funds [Member] | Level 2 [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] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Commodity derivative [Member] | 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	(3)
Commodity derivative [Member] | 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		(191)	(167)
Commodity derivative [Member] | 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		(17)	(10)
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			0
Sierra Pacific Power Company [Member] | Investment funds [Member] | 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] | Investment funds [Member] | 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] | Investment funds [Member] | 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 mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	30
Sierra Pacific Power Company [Member] | 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	[1]	30
Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0
Sierra Pacific Power Company [Member] | 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	[1]	0
Sierra Pacific Power Company [Member] | Commodity derivative [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		(2)
Sierra Pacific Power Company [Member] | Commodity derivative [Member] | 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
Sierra Pacific Power Company [Member] | Commodity derivative [Member] | 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		0
Sierra Pacific Power Company [Member] | Commodity derivative [Member] | 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		$ (2)
[1]	(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 Measurements Fair121

Fair Value Measurements Fair Value Measurements - SPPC - Level 3 (Details) - Sierra Pacific Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 0	$ 0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	2	0
Ending balance	$ (2)	$ 0

Fair Value Measurements - SPPC

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,498	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,579	40,522
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,120	1,120
Sierra Pacific Power Company [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,186	$ 1,221

Commitments and Contingencies -

Commitments and Contingencies - Commitments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 283
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	$ 250

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Hydroelectric [Line Items]
Dam removal cost limit	$ 200
OREGON
Hydroelectric [Line Items]
Dam removal cost limit	184
CALIFORNIA
Hydroelectric [Line Items]
Additional dam removal costs, California bond measure	250
Dam removal cost limit	$ 16

Commitments and Contingencie125

Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) $ in Millions	Mar. 31, 2018USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 283

Commitments and Contingencie126

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] - Electric Transmission [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity Adder, Percentage	0.50%
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Accrued liability for estimated transmission billings refunds	$ 10
Prior to September 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
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%
February 2015 through May 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

Commitments and Contingencie127

Commitments and Contingencies Commitments and Contingencies - MEC - Retail Rates (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
MidAmerican Energy Company [Member] | Tax Cuts and Jobs Act of 2017 [Member]
Loss Contingencies [Line Items]
Loss Contingency, Accrual, Current	$ 29
Tax Cuts and Jobs Act of 2017 [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%

Revenue from Contracts with 128

Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 582		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,524
Energy	3,679	$ 3,581
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	155
MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	741
Energy	747	696
MidAmerican Funding [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	6
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,140
Energy	1,184	1,281
PacifiCorp [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	44
NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	610
Energy	617	584
NV Energy, Inc. [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	7
Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	260
Energy	278	245
Northern Powergrid Holdings [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	18
BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	374
Energy	376	315
BHE Pipeline Group [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	2
BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	180
Energy	180	166
BHE Transmission [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	0
BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	117
Energy	154	144
BHE Renewables [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	37
Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	102
Energy	143	$ 150
Berkshire Hathaway Energy And Other [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	41
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,252
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,021
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	286
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	125
Regulated Operation [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	487
Regulated Operation [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	333
Regulated Operation [Member] | MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	741
Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	386
Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	246
Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	93
Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	16
Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,140
Regulated Operation [Member] | PacifiCorp [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,096
Regulated Operation [Member] | PacifiCorp [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | PacifiCorp [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22
Regulated Operation [Member] | PacifiCorp [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22
Regulated Operation [Member] | PacifiCorp [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	610
Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	539
Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40
Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11
Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20
Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	249
Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	249
Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	374
Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	374
Regulated Operation [Member] | BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	180
Regulated Operation [Member] | BHE Transmission [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Transmission [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Transmission [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Transmission [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	180
Regulated Operation [Member] | BHE Transmission [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | BHE Renewables [Member] | Regulated interstate pipeline [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	(42)
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(1)
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(41)
Unregulated Operation [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	272
Unregulated Operation [Member] | MidAmerican Funding [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Unregulated Operation [Member] | PacifiCorp [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Unregulated Operation [Member] | NV Energy, Inc. [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Unregulated Operation [Member] | Northern Powergrid Holdings [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11
Unregulated Operation [Member] | BHE Pipeline Group [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Unregulated Operation [Member] | BHE Transmission [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Unregulated Operation [Member] | BHE Renewables [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	117
Unregulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 144

Revenue from Contracts with 129

Revenue from Contracts with Customers Revenue from Contracts with Customers - Real Estate Services (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,524
Real estate	761	$ 585
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	700
Real estate	761	$ 585
HomeServices [Member] | Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	685
HomeServices [Member] | Real estate franchise [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15
HomeServices [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Real estate	$ 61

Revenue from Contracts with 130

Revenue from Contracts with Customers Revenue from Contracts with Customers - Remaining Performance Obligation (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,007
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	471
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	536
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	4,352
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	4,352
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	0
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	5,359
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	4,823
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 536

Revenue from Contracts with 131

Revenue from Contracts with Customers Revenue from Contracts with Customers - PAC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,524
Unbilled Contracts Receivable	582		$ 665
Revenues	4,440	$ 4,166
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,252
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,021
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	125
Regulated Operation [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	487
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Accounts Receivable	552		635
Unbilled Contracts Receivable	215		$ 255
Revenues	1,184
PacifiCorp [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	44
PacifiCorp [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,140
PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,077
PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	441
PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	342
PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	269
PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	25
PacifiCorp [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22
PacifiCorp [Member] | Regulated Operation [Member] | Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22
PacifiCorp [Member] | Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 19

Revenue from Contracts with 132

Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,524
Revenues	4,440	$ 4,166
Unbilled Contracts Receivable	582		$ 665
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,252
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,021
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	286
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	125
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	740
Revenues	746	$ 695
Unbilled Contracts Receivable	77		$ 89
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	6
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	629
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	329
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	133
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	150
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	94
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	464
Revenues	469
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	387
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	161
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	71
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	145
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	62
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	5
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	274
Revenues	275
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	242
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	168
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	62
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [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	13
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(6)
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	32
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	1
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2
Revenues	2
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0

Revenue from Contracts with 133

Revenue from Contracts with Customers Revenue from Contracts with Customers - LLC - Customer Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,524
Unregulated Operation [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	272
MidAmerican Funding, LLC and Subsidiaries [Domain] | Unregulated Operation [Member] | Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1

Revenue from Contracts with 134

Revenue from Contracts with Customers Revenue from Contracts with Customers - NPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 582		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,524
Revenues	4,440	$ 4,166
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	97		$ 111
Revenues	395
Nevada Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	5
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,252
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,021
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	125
Regulated Operation [Member] | Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	390
Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	380
Regulated Operation [Member] | Nevada Power Company [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10
Fully bundled customer [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	373
Fully bundled customer [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	193
Fully bundled customer [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	95
Fully bundled customer [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	79
Fully bundled customer [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6
Distribution only service [Member] | Regulated Operation [Member] | Nevada Power Company [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 7

Revenue from Contracts with 135

Revenue from Contracts with Customers Revenue from Contracts with Customers - SPPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 582		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,524
Revenues	4,440	$ 4,166
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,252
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,021
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	125
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	57		62
Revenues	222	$ 193
Sierra Pacific Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	2
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues	181
Sierra Pacific Power Company [Member] | Electric Operations [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	1
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues	41
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	1
Sierra Pacific Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	220
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	180
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	206
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	94
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	68
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Electric Operations [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	166
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	68
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	57
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	39
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Natural Gas Operations [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Natural Gas Operations [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Natural Gas Operations [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Natural Gas Operations [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member] | Electric Operations [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	207
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member] | Electric Operations [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	167
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member] | Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	97		$ 111
Revenues	395
Nevada Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	5
Nevada Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	390
Nevada Power Company [Member] | Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	380
Nevada Power Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10
Nevada Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	373
Nevada Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	193
Nevada Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	95
Nevada Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	79
Nevada Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6
Nevada Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 7

Components of Accumulated Ot136

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net	(398)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	(3)	$ 5
Other comprehensive income (loss), foreign currency translation adjustment	73	87
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Ending balance - Accumulated other comprehensive loss, net	(1,415)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(1,085)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits	(383)	(447)
Beginning balance - foreign currency translation adjustment	(1,129)	(1,675)
Beginning balance - unrealized gains (losses) on available-for-sale securities	1,085	585
Beginning balance - unrealized gains (losses) on cash flow hedges	29	26
Beginning balance - Accumulated other comprehensive loss, net	(398)	(1,511)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	(3)	5
Other comprehensive income (loss), foreign currency translation adjustment	73	87
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Ending balance - unrecognized amounts on retirement benefits	(386)	(442)
Ending balance - foreign currency translation adjustment	(1,056)	(1,588)
Ending balance - unrealized gains (losses) on available-for-sale securities	0	623
Ending balance - unrealized gains (losses) on cash flow hedges	27	22
Ending balance - Accumulated other comprehensive loss, net	$ (1,415)	$ (1,385)

Components of Accumulated Ot137

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net	$ (398)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	$ 38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Ending balance - Accumulated other comprehensive loss, net	(1,415)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities	1,085	585
Beginning balance - unrealized gains (losses) on cash flow hedges	29	26
Beginning balance - Accumulated other comprehensive loss, net	(398)	(1,511)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	38
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(2)	(4)
Other comprehensive income (loss)	68	126
Ending balance - unrealized gains (losses) on available-for-sale securities	0	623
Ending balance - unrealized gains (losses) on cash flow hedges	27	22
Ending balance - Accumulated other comprehensive loss, net	$ (1,415)	$ (1,385)

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 4,440	$ 4,166
Sales revenue from energy operations	3,679	3,581
Real estate	761	585
Depreciation and amortization - energy operations	(704)	(610)
Depreciation and amortization	716	622
Operating income	871	967
Interest expense	466	458
Capitalized interest	12	10
Allowance for equity funds	21	17
Interest and dividend income	26	26
Realized and unrealized (loss) gain on marketable securities, net	(209)
Gain on Sale of Investments		3
Other, net	30	26
Income before income tax expense and equity income	285	591
Assets	90,912		$ 90,208
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,184	1,281
Depreciation and amortization - energy operations	(202)	(196)
Operating income	247	339
Interest expense	96	95
Assets	22,989		23,086
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	747	696
Depreciation and amortization - energy operations	(158)	(117)
Operating income	79	102
Interest expense	63	59
Assets	18,707		18,444
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	617	584
Depreciation and amortization - energy operations	(113)	(104)
Operating income	89	98
Interest expense	58	58
Assets	13,911		13,903
Northern Powergrid Holdings [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	278	245
Depreciation and amortization - energy operations	(63)	(49)
Operating income	147	140
Interest expense	37	31
Assets	7,897		7,565
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	376	315
Depreciation and amortization - energy operations	(42)	(30)
Operating income	226	208
Interest expense	10	12
Assets	5,252		5,134
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	180	166
Depreciation and amortization - energy operations	(62)	(54)
Operating income	81	77
Interest expense	43	41
Assets	8,762		9,009
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	154	144
Depreciation and amortization - energy operations	(64)	(61)
Operating income	28	15
Interest expense	52	50
Assets	7,790		7,687
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	761	585
Depreciation and amortization	12	12
Operating income	(8)	2
Interest expense	4	1
Assets	2,739		2,722
Berkshire Hathaway Energy And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	143	150
Depreciation and amortization - energy operations	0	1
Operating income	(18)	(14)
Interest expense	103	111
Assets	2,865		$ 2,658
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	3,978	3,747
Income before income tax expense and equity income	118	423
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	277	245
Income before income tax expense and equity income	112	102
CANADA
Segment Reporting Information [Line Items]
Revenues	180	166
Income before income tax expense and equity income	41	42
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	5	8
Income before income tax expense and equity income	$ 14	$ 24

Segment Information - Goodwill

Segment Information - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,678
Foreign currency translation	(13)
Ending balance	9,665
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129
Foreign currency translation	0
Ending balance	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102
Foreign currency translation	0
Ending balance	2,102
NV Energy, Inc. [Member]
Goodwill [Roll Forward]
Beginning balance	2,369
Foreign currency translation	0
Ending balance	2,369
Northern Powergrid Holdings [Member]
Goodwill [Roll Forward]
Beginning balance	991
Foreign currency translation	26
Ending balance	1,017
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	73
Foreign currency translation	0
Ending balance	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,571
Foreign currency translation	(39)
Ending balance	1,532
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95
Foreign currency translation	0
Ending balance	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	1,348
Foreign currency translation	0
Ending balance	$ 1,348

Segment Information Segment Inf

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)OperatingSegmentsReportableSegments	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments	8
Revenues	$ 4,440	$ 4,166
Operating income	871	967
Interest expense	(466)	(458)
Capitalized interest	12	10
Allowance for equity funds	21	17
Other, net	30	26
Income before income tax (benefit) expense and equity income	285	591
Assets	$ 90,912		$ 90,208
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments	2
Electric Domestic Regulated Revenue	$ 469	433
Revenues	746	695
Operating income	79	102
Interest expense	(58)	(53)
Capitalized interest	4	2
Allowance for equity funds	10	6
Other, net	9	11
Income before income tax (benefit) expense and equity income	44	68
Assets	16,580		16,318
MidAmerican Energy Company [Member] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	469	433
Operating income	36	63
Assets	15,254		14,914
MidAmerican Energy Company [Member] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	275	262
Operating income	43	39
Assets	1,323		1,403
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	2	$ 0
Assets	$ 3		$ 1

Segment Information Segment 141

Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)OperatingSegmentsReportableSegments	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments		8
Revenues		$ 4,440	$ 4,166
Operating income		871	967
Interest expense		(466)	(458)
Capitalized interest		12	10
Allowance for equity funds		21	17
Other, net		30	26
Income before income tax (benefit) expense and equity income		285	591
Assets		$ 90,912		$ 90,208
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments		2
Electric Domestic Regulated Revenue		$ 469	433
Revenues		747	696
Operating income		79	102
Interest expense		(63)	(59)
Capitalized interest		4	2
Allowance for equity funds		10	6
Other, net		10	11
Income before income tax (benefit) expense and equity income		40	62
Assets	[1]	17,879		17,621
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		469	433
Operating income		36	63
Assets	[1]	16,445		16,105
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		275	262
Operating income		43	39
Assets	[1]	1,402		1,482
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net		3	$ 1
Assets	[1]	$ 32		$ 34
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Segment Information Segment 142

Segment Information Segment Information - SPPC (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)OperatingSegmentsTheNumberOfReportableSegments	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments		8
Revenues		$ 4,440	$ 4,166
Operating income		871	967
Interest expense		466	458
Allowance for equity funds		21	17
Other, net		30	26
Income before income tax expense and equity income		285	591
Assets		$ 90,912		$ 90,208
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | TheNumberOfReportableSegments		2
Electric Domestic Regulated Revenue		$ 181	159
Gas Domestic Regulated Revenue		41	34
Revenues		222	193
Operating income		47	46
Interest expense		10	11
Allowance for equity funds		1	1
Other, net		2	1
Income before income tax expense and equity income		40	37
Assets		3,439		3,413
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		181	159
Revenues		181
Operating income		37	36
Assets		3,092		3,103
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		41	34
Revenues		41
Operating income		10	$ 10
Assets		307		300
Sierra Pacific Power Company [Member] | Regulated common assets [Member]
Segment Reporting Information [Line Items]
Assets	[1]	$ 40		$ 10
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Related Party Transactions Rela

Related Party Transactions Related Party Transactions PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Related party transaction, cash received for income taxes, net	$ 0	$ 0

BHE Shareholders' Equity (Detai

BHE Shareholders' Equity (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2018	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Stock Repurchased During Period, Value			$ 90	$ 19
Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	149,281	35,000
Stock Repurchased During Period, Value	$ 90	$ 19