Midamerican Funding 10-Q 4 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
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		77,391,144
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	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,018	$ 1,108
Trade receivables, net	1,852	1,785
Income taxes receivable	53	319
Inventories	926	882
Mortgage loans held for sale	462	335
Other current assets	864	814
Total current assets	5,175	5,243
Property, plant and equipment, net	62,108	60,769
Goodwill	9,085	9,076
Regulatory assets	4,259	4,155
Investments and restricted cash and investments	4,147	3,367
Other assets	1,114	1,008
Total assets	85,888	83,618
Current liabilities:
Accounts payable	1,475	1,564
Accrued interest	466	469
Accrued property, income and other taxes	804	372
Accrued employee expenses	355	264
Regulatory Liability, Current	306	402
Short-term debt	1,886	974
Current portion of long-term debt	1,108	1,148
Other current liabilities	879	896
Total current liabilities	7,279	6,089
Regulatory liabilities	2,788	2,631
BHE senior debt	7,417	7,814
BHE junior subordinated debentures	1,444	2,944
Subsidiary debt	26,234	26,066
Deferred income taxes	13,486	12,685
Other long-term liabilities	2,744	2,854
Total liabilities	61,392	61,083
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	6,404	6,403
Retained earnings	18,968	16,906
Accumulated other comprehensive loss, net	(1,018)	(908)
Total BHE shareholders' equity	24,354	22,401
Noncontrolling interests	142	134
Total equity	24,496	22,535
Total liabilities and equity	$ 85,888	$ 83,618

Consolidated Balance Sheets - P

Consolidated Balance Sheets - PacifiCorp - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,018	$ 1,108
Income taxes receivable	53	319
Other current assets	864	814
Total current assets	5,175	5,243
Regulatory assets	4,259	4,155
Other assets	1,114	1,008
Total assets	85,888	83,618
Current liabilities:
Accounts payable	1,475	1,564
Accrued employee expenses	355	264
Accrued interest	466	469
Accrued property, income and other taxes	804	372
Short-term debt	1,886	974
Regulatory Liability, Current	306	402
Other current liabilities	879	896
Total current liabilities	7,279	6,089
Regulatory liabilities	2,788	2,631
Deferred income taxes	13,486	12,685
Other long-term liabilities	2,744	2,854
Total liabilities	61,392	61,083
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,404	6,403
Retained earnings	18,968	16,906
Accumulated other comprehensive loss, net	(1,018)	(908)
Total BHE shareholders' equity	24,354	22,401
Total liabilities and equity	85,888	83,618
PacifiCorp [Member]
Current assets:
Cash and cash equivalents	198	12
Receivables, Net, Current	702	740
Income taxes receivable	0	17
Other Inventory, Supplies, Gross	229	233
Energy Related Inventory, Other Fossil Fuel	225	192
Regulatory Assets, Current	65	102
Other current assets	56	81
Total current assets	1,475	1,377
Public Utilities, Property, Plant and Equipment, Net	19,047	19,026
Regulatory assets	1,456	1,583
Other assets	411	381
Total assets	22,389	22,367
Current liabilities:
Accounts payable	410	473
Accrued Income Taxes, Current	116	0
Accrued employee expenses	93	70
Accrued interest	106	115
Accrued property, income and other taxes	129	62
Short-term debt	0	20
Long-term Debt and Capital Lease Obligations, Current	67	68
Regulatory Liability, Current	45	34
Other current liabilities	189	229
Total current liabilities	1,155	1,071
Regulatory liabilities	963	938
Long-term Debt and Capital Lease Obligations	7,026	7,078
Deferred income taxes	4,816	4,750
Other long-term liabilities	882	1,027
Total liabilities	14,842	14,864
Commitments and contingencies
Equity:
Preferred Stock, Value, Issued	2	2
Common stock	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	3,077	3,033
Accumulated other comprehensive loss, net	(11)	(11)
Total BHE shareholders' equity	7,547	7,503
Total liabilities and equity	$ 22,389	$ 22,367

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - PacifiCorp - $ / shares shares in Millions	Sep. 30, 2016	Dec. 31, 2015
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	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,018	$ 1,108
Income taxes receivable	53	319
Inventories	926	882
Other current assets	864	814
Total current assets	5,175	5,243
Regulatory assets	4,259	4,155
Investments and restricted cash and investments	4,147	3,367
Other assets	1,114	1,008
Total assets	85,888	83,618
Current liabilities:
Accounts Payable, Current	1,475	1,564
Accrued interest	466	469
Accrued property, income and other taxes	804	372
Short-term debt	1,886	974
Other current liabilities	879	896
Total current liabilities	7,279	6,089
Deferred income taxes	13,486	12,685
Regulatory liabilities	2,788	2,631
Other long-term liabilities	2,744	2,854
Total liabilities	61,392	61,083
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,404	6,403
Retained earnings	18,968	16,906
Accumulated other comprehensive loss, net	(1,018)	(908)
Total shareholder's equity	24,354	22,401
Total liabilities and equity	85,888	83,618
MidAmerican Energy Company [Member]
Current assets:
Cash and cash equivalents	50	103
Receivables, Net, Current	292	342
Income taxes receivable	0	104
Inventories	264	238
Other current assets	19	58
Total current assets	625	845
Public Utilities, Property, Plant and Equipment, Net	12,453	11,723
Regulatory assets	1,171	1,044
Investments and restricted cash and investments	663	634
Other assets	171	139
Total assets	15,083	14,385
Current liabilities:
Accounts Payable, Current	309	426
Accrued interest	46	46
Accrued property, income and other taxes	183	125
Long-term Debt and Capital Lease Obligations, Current	250	34
Other current liabilities	167	166
Total current liabilities	955	797
Long-term Debt and Capital Lease Obligations	4,018	4,237
Deferred income taxes	3,330	3,061
Regulatory liabilities	806	831
Asset retirement obligations	554	488
Other long-term liabilities	277	266
Total liabilities	9,940	9,680
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	561	561
Retained earnings	4,583	4,174
Accumulated other comprehensive loss, net	(1)	(30)
Total shareholder's equity	5,143	4,705
Total liabilities and equity	$ 15,083	$ 14,385

Consolidated Balance Sheets - M

Consolidated Balance Sheets - MidAmerican Funding - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 1,018	$ 1,108
Income taxes receivable		53	319
Inventories		926	882
Other current assets		864	814
Total current assets		5,175	5,243
Property, plant and equipment, net		62,108	60,769
Goodwill		9,085	9,076
Regulatory assets		4,259	4,155
Investments and restricted cash and investments		4,147	3,367
Other assets		1,114	1,008
Total assets		85,888	83,618
Current liabilities:
Accounts payable		1,475	1,564
Accrued interest		466	469
Accrued property, income and other taxes		804	372
Short-term debt		1,886	974
Other current liabilities		879	896
Total current liabilities		7,279	6,089
Deferred income taxes		13,486	12,685
Regulatory liabilities		2,788	2,631
Other long-term liabilities		2,744	2,854
Total liabilities		61,392	61,083
Commitments and contingencies
Equity:
Additional paid-in capital		6,404	6,403
Retained earnings		18,968	16,906
Accumulated other comprehensive loss, net		(1,018)	(908)
Total member's equity		24,354	22,401
Total liabilities and equity		85,888	83,618
MidAmerican Funding, LLC and Subsidiaries [Domain]
Current assets:
Cash and cash equivalents		51	103
Receivables, Net, Current		295	346
Income taxes receivable		0	104
Inventories		264	238
Other current assets		18	58
Total current assets		628	849
Property, plant and equipment, net		12,466	11,737
Goodwill		1,270	1,270
Regulatory assets		1,171	1,044
Investments and restricted cash and investments		665	636
Other assets		172	138
Total assets	[1]	16,372	15,674
Current liabilities:
Accounts payable		309	427
Accrued interest		49	53
Accrued property, income and other taxes		183	125
Notes Payable, Related Parties, Current		38	139
Long-term Debt and Capital Lease Obligations, Current		250	34
Other current liabilities		167	166
Total current liabilities		996	944
Long-term Debt and Capital Lease Obligations		4,343	4,563
Deferred income taxes		3,325	3,056
Regulatory liabilities		806	831
Asset retirement obligations		554	488
Other long-term liabilities		277	267
Total liabilities		10,301	10,149
Commitments and contingencies
Equity:
Additional paid-in capital		1,679	1,679
Retained earnings		4,393	3,876
Accumulated other comprehensive loss, net		(1)	(30)
Total member's equity		6,071	5,525
Total liabilities and equity		$ 16,372	$ 15,674
[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	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,018	$ 1,108
Trade receivables, net	1,852	1,785
Inventories	926	882
Other current assets	864	814
Total current assets	5,175	5,243
Regulatory assets	4,259	4,155
Other assets	1,114	1,008
Total assets	85,888	83,618
Current liabilities:
Accounts payable	1,475	1,564
Accrued interest	466	469
Accrued property, income and other taxes	804	372
Regulatory Liability, Current	306	402
Other current liabilities	879	896
Total current liabilities	7,279	6,089
Regulatory liabilities	2,788	2,631
Deferred income taxes	13,486	12,685
Other long-term liabilities	2,744	2,854
Total liabilities	61,392	61,083
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,404	6,403
Retained earnings	18,968	16,906
Accumulated other comprehensive loss, net	(1,018)	(908)
Total shareholder's equity	24,354	22,401
Total liabilities and equity	85,888	83,618
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	302	536
Trade receivables, net	359	265
Inventories	72	80
Other current assets	51	46
Total current assets	784	927
Public Utilities, Property, Plant and Equipment, Net	6,971	6,996
Regulatory assets	1,018	1,057
Other assets	38	37
Total assets	8,811	9,017
Current liabilities:
Accounts payable	208	214
Accrued interest	27	54
Accrued property, income and other taxes	128	30
Regulatory Liability, Current	88	173
Long-term Debt and Financial and Capital Lease Obligations, Current	15	225
Customer Deposits, Current	64	58
Other current liabilities	55	28
Total current liabilities	585	782
Long-term Debt and Financial and Capital Lease Obligations	3,050	3,060
Regulatory liabilities	411	304
Deferred income taxes	1,449	1,405
Other long-term liabilities	262	303
Total liabilities	5,757	5,854
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	749	858
Accumulated other comprehensive loss, net	(3)	(3)
Total shareholder's equity	3,054	3,163
Total liabilities and equity	$ 8,811	$ 9,017

Consolidated Balance Sheets (P8

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Sep. 30, 2016	Dec. 31, 2015
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	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,018	$ 1,108
Trade receivables, net	1,852	1,785
Inventories	926	882
Other current assets	864	814
Total current assets	5,175	5,243
Regulatory assets	4,259	4,155
Other assets	1,114	1,008
Total assets	85,888	83,618
Current liabilities:
Accounts payable	1,475	1,564
Accrued interest	466	469
Accrued property, income and other taxes	804	372
Regulatory Liability, Current	306	402
Other current liabilities	879	896
Total current liabilities	7,279	6,089
Regulatory liabilities	2,788	2,631
Deferred income taxes	13,486	12,685
Other long-term liabilities	2,744	2,854
Total liabilities	61,392	61,083
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,404	6,403
Retained earnings	18,968	16,906
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,018)	(908)
Total shareholder's equity	24,354	22,401
Total liabilities and equity	85,888	83,618
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	67	106
Trade receivables, net	107	124
Inventories	39	39
Other current assets	17	13
Total current assets	230	282
Public Utilities, Property, Plant and Equipment, Net	2,801	2,766
Regulatory assets	434	432
Other assets	7	7
Total assets	3,472	3,487
Current liabilities:
Accounts payable	116	127
Accrued interest	11	15
Accrued property, income and other taxes	11	13
Regulatory Liability, Current	94	78
Long-term Debt and Financial and Capital Lease Obligations, Current	2	453
Customer Deposits, Current	17	17
Other current liabilities	19	11
Total current liabilities	270	714
Long-term Debt and Financial and Capital Lease Obligations	1,153	749
Regulatory liabilities	225	230
Deferred income taxes	606	570
Other long-term liabilities	123	148
Total liabilities	2,377	2,411
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	(15)	(35)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1)	0
Total shareholder's equity	1,095	1,076
Total liabilities and equity	$ 3,472	$ 3,487

Consolidated Balance Sheets (10

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Sep. 30, 2016	Dec. 31, 2015
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 (11

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2016	Dec. 31, 2015
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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenue:
Energy	$ 4,272	$ 4,324	$ 11,102	$ 11,787
Real estate	820	745	2,152	1,951
Total operating revenue	5,092	5,069	13,254	13,738
Energy:
Cost of sales	1,187	1,354	3,252	3,937
Operating expense	948	903	2,739	2,744
Depreciation and amortization	639	609	1,898	1,794
Real estate	733	667	1,973	1,790
Total operating costs and expenses	3,507	3,533	9,862	10,265
Operating income	1,585	1,536	3,392	3,473
Other income (expense):
Interest expense	(460)	(475)	(1,401)	(1,423)
Interest Costs Capitalized Adjustment	14	18	128	69
Allowance for equity funds	17	23	147	84
Interest and dividend income	39	27	93	79
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Equity income	36	33	96	89
Net income	1,047	884	2,087	1,924
Net income attributable to noncontrolling interests	11	10	25	23
Net income attributable to BHE shareholders	$ 1,036	$ 874	$ 2,062	$ 1,901

Consolidated Statements of Op13

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating costs and expenses:
Operating income	$ 1,585	$ 1,536	$ 3,392	$ 3,473
Other income (expense):
Interest expense	(460)	(475)	(1,401)	(1,423)
Allowance for equity funds	17	23	147	84
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Net income attributable to BHE shareholders	1,036	874	2,062	1,901
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,434	1,423	3,919	3,942
Operating costs and expenses:
Cost of Domestic Regulated Electric	478	491	1,295	1,404
Utilities Operating Expense, Maintenance and Operations	272	260	800	800
Utilities Operating Expense, Depreciation and Amortization	193	188	576	567
Utilities Operating Expense, Taxes	47	48	141	138
Utilities Operating Expense	990	987	2,812	2,909
Operating income	444	436	1,107	1,033
Other income (expense):
Interest expense	(95)	(95)	(285)	(283)
Interest Costs Capitalized Adjustment	4	4	12	14
Allowance for equity funds	7	7	21	26
Other, net	3	2	9	7
Total other income (expense)	(81)	(82)	(243)	(236)
Income before income tax expense and equity income	363	354	864	797
Income tax expense	110	109	270	247
Net income attributable to BHE shareholders	$ 253	$ 245	$ 594	$ 550

Statements of Operations - MEC

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenue:
Total operating revenue	$ 5,092	$ 5,069	$ 13,254	$ 13,738
Operating costs and expenses:
Total operating costs and expenses	3,507	3,533	9,862	10,265
Operating income	1,585	1,536	3,392	3,473
Other income (expense):
Interest expense	(460)	(475)	(1,401)	(1,423)
Allowance for borrowed funds	14	18	128	69
Allowance for equity funds	17	23	147	84
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Net income attributable to BHE shareholders	1,036	874	2,062	1,901
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	692	585	1,572	1,472
Gas Domestic Regulated Revenue And Other Revenue	103	95	432	502
Total operating revenue	795	680	2,004	1,974
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	125	312	351
Cost of gas sold and other	55	48	237	304
Utilities Operating Expense, Maintenance and Operations	180	172	510	516
Utilities Operating Expense, Depreciation and Amortization	118	101	338	300
Utilities Operating Expense, Taxes	28	26	84	83
Total operating costs and expenses	511	472	1,481	1,554
Operating income	284	208	523	420
Other income (expense):
Interest expense	(50)	(44)	(147)	(133)
Allowance for borrowed funds	3	2	6	6
Allowance for equity funds	6	5	14	16
Other, net	3	(3)	8	2
Total other income (expense)	(38)	(40)	(119)	(109)
Income before income tax expense and equity income	246	168	404	311
Income tax expense	(74)	(65)	(123)	(138)
Income (Loss) from Continuing Operations Attributable to Parent	320	233	527	449
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	2	0	18
Discontinued Operation, Tax Effect of Discontinued Operation	0	1	0	8
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	1	0	10
Net income attributable to BHE shareholders	$ 320	$ 234	$ 527	$ 459

Consolidated Statements of Op15

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenue:
Total operating revenue	$ 5,092	$ 5,069	$ 13,254	$ 13,738
Operating costs and expenses:
Total operating costs and expenses	3,507	3,533	9,862	10,265
Operating income	1,585	1,536	3,392	3,473
Other income (expense):
Other Interest and Dividend Income	(460)	(475)	(1,401)	(1,423)
Allowance for borrowed funds	14	18	128	69
Allowance for equity funds	17	23	147	84
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Net income attributable to BHE shareholders	1,036	874	2,062	1,901
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	692	585	1,572	1,472
Gas Domestic Regulated Revenue And Other Revenue	105	96	436	512
Total operating revenue	797	681	2,008	1,984
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	125	312	351
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	56	48	239	311
Utilities Operating Expense, Maintenance and Operations	181	172	511	517
Utilities Operating Expense, Depreciation and Amortization	118	101	338	300
Utilities Operating Expense, Taxes	28	26	84	83
Total operating costs and expenses	513	472	1,484	1,562
Operating income	284	209	524	422
Other income (expense):
Other Interest and Dividend Income	(55)	(50)	(164)	(150)
Allowance for borrowed funds	3	2	6	6
Allowance for equity funds	6	5	14	16
Other, net	3	(3)	9	16
Total other income (expense)	(43)	(46)	(135)	(112)
Income before income tax expense and equity income	241	163	389	310
Income tax expense	(77)	(67)	(129)	(139)
Income (Loss) from Continuing Operations Attributable to Parent	318	230	518	449
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	2	0	18
Discontinued Operation, Tax Effect of Discontinued Operation	0	1	0	8
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	1	0	10
Net income attributable to BHE shareholders	$ 318	$ 231	$ 518	$ 459

Consolidated Statements of Op16

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Cost of sales	$ 1,187	$ 1,354	$ 3,252	$ 3,937
Total operating costs and expenses	3,507	3,533	9,862	10,265
Operating income	1,585	1,536	3,392	3,473
Interest expense	460	475	1,401	1,423
Allowance for equity funds	17	23	147	84
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Net income attributable to BHE shareholders	1,036	874	2,062	1,901
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	766	878	1,690	1,944
Cost of sales	251	362	618	879
Utilities Operating Expense, Maintenance and Operations	105	104	304	279
Utilities Operating Expense, Depreciation and Amortization	76	74	227	222
Utilities Operating Expense, Taxes	10	9	30	25
Total operating costs and expenses	442	549	1,179	1,405
Operating income	324	329	511	539
Interest expense	45	48	140	141
Allowance for Funds Used During Construction, Capitalized Interest	0	1	2	2
Allowance for equity funds	0	1	3	3
Other, net	7	4	17	15
Total other income (expense)	(38)	(42)	(118)	(121)
Income before income tax expense and equity income	286	287	393	418
Income tax expense	98	100	136	147
Net income attributable to BHE shareholders	$ 188	$ 187	$ 257	$ 271

Consolidated Statements of Op17

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total operating revenue	$ 5,092	$ 5,069	$ 13,254	$ 13,738
Cost of sales	1,187	1,354	3,252	3,937
Total operating costs and expenses	3,507	3,533	9,862	10,265
Operating income	1,585	1,536	3,392	3,473
Interest expense	460	475	1,401	1,423
Allowance for equity funds	17	23	147	84
Other, net	15	(9)	26	27
Total other income (expense)	(375)	(416)	(1,007)	(1,164)
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Income tax expense	199	269	394	474
Net income attributable to BHE shareholders	1,036	874	2,062	1,901
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	207	228	539	625
Gas Domestic Regulated Revenue	15	18	81	94
Total operating revenue	222	246	620	719
Cost of sales	73	96	208	294
Cost of Purchased Oil and Gas	5	7	42	57
Utilities Operating Expense, Maintenance and Operations	40	42	126	119
Utilities Operating Expense, Depreciation and Amortization	30	28	88	84
Utilities Operating Expense, Taxes	5	7	18	19
Total operating costs and expenses	153	180	482	573
Operating income	69	66	138	146
Interest expense	12	16	42	46
Allowance for Funds Used During Construction, Capitalized Interest	0	0	1	1
Allowance for equity funds	1	1	2	2
Other, net	2	1	3	3
Total other income (expense)	(9)	(14)	(36)	(40)
Income before income tax expense and equity income	60	52	102	106
Income tax expense	22	19	37	38
Net income attributable to BHE shareholders	$ 38	$ 33	$ 65	$ 68

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 1,047	$ 884	$ 2,087	$ 1,924
Other comprehensive loss, net of tax:
Unrecognized amounts on retirement benefits, net of tax of $7, $7, $26 and $4	(18)	(16)	(80)	(10)
Foreign currency translation adjustment	(134)	(318)	(339)	(479)
Unrealized gains (losses) on available-for-sale securities, net of tax of $53, $(69), $89 and $121	80	(103)	151	179
Unrealized losses on cash flow hedges, net of tax of $(3), $(6), $(1) and $(9)	(3)	(7)	(2)	(13)
Total other comprehensive (loss) income, net of tax	(39)	(412)	(110)	(303)
Comprehensive income	1,008	472	1,977	1,621
Comprehensive income attributable to noncontrolling interests	11	10	25	23
Comprehensive income attributable to BHE shareholders	$ 997	$ 462	$ 1,952	$ 1,598

Statements of Comprehensive Inc

Statements of Comprehensive Income - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 1,036	$ 874	$ 2,062	$ 1,901
Other comprehensive income (loss), unrealized gains on available-for-sale securities	80	(103)	151	179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(3)	(7)	(2)	(13)
Other comprehensive income (loss)	(39)	(412)	(110)	(303)
Comprehensive income attributable to BHE shareholders	997	462	1,952	1,598
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	320	234	527	459
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	(1)	2	0
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	0	(3)	0	(7)
Other comprehensive income (loss)	0	(4)	2	(7)
Comprehensive income attributable to BHE shareholders	$ 320	$ 230	$ 529	$ 452

Statements of Comprehensive I20

Statements of Comprehensive Income (Parenthetical) - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Unrealized (losses) gains on available-for-sale securities, tax	$ 53	$ (69)	$ 89	$ 121
Unrealized (losses) gains on cash flow hedges, tax	(3)	(6)	(1)	(9)
MidAmerican Energy Company [Member]
Unrealized (losses) gains on available-for-sale securities, tax	0	0	1	0
Unrealized (losses) gains on cash flow hedges, tax	$ 0	$ (4)	$ 0	$ (5)

Consolidated Statements of Co21

Consolidated Statements of Comprehensive Income - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 1,036	$ 874	$ 2,062	$ 1,901
Other comprehensive income (loss), unrealized gains on available-for-sale securities	80	(103)	151	179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(3)	(7)	(2)	(13)
Other comprehensive income (loss)	(39)	(412)	(110)	(303)
Comprehensive income attributable to BHE shareholders	997	462	1,952	1,598
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	318	231	518	459
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	(1)	2	0
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	0	(3)	0	(7)
Other comprehensive income (loss)	0	(4)	2	(7)
Comprehensive income attributable to BHE shareholders	$ 318	$ 227	$ 520	$ 452

Consolidated Statements of Co22

Consolidated Statements of Comprehensive Income (Parenthetical) - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Unrealized (losses) gains on available-for-sale securities, tax	$ 53	$ (69)	$ 89	$ 121
Unrealized (losses) gains on cash flow hedges, tax	(3)	(6)	(1)	(9)
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unrealized (losses) gains on available-for-sale securities, tax	0	0	1	0
Unrealized (losses) gains on cash flow hedges, tax	$ 0	$ (4)	$ 0	$ (5)

Consolidated Statements of Co23

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 7	$ 7	$ 26	$ 4
Unrealized (losses) gains on available-for-sale securities, tax	53	(69)	89	121
Unrealized (losses) gains on cash flow hedges, tax	$ (3)	$ (6)	$ (1)	$ (9)

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]
Balance (shares) at Dec. 31, 2014		77
Balance at Dec. 31, 2014	$ 20,573	$ 0	$ 6,423	$ 14,513	$ (494)	$ 131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASC 853	67	0	0	56	0	11
Net Income	1,914	0	0	1,901	0	13
Other comprehensive income (loss)	(303)	0	0	0	(303)	0
Distributions	(15)	0	0	0	0	(15)
Common stock purchases	(36)	0	(3)	(33)	0	0
Other equity transactions	(12)	$ 0	(8)	0	0	(4)
Balance (shares) at Sep. 30, 2015		77
Balance at Sep. 30, 2015	$ 22,188	$ 0	6,412	16,437	(797)	136
Balance (shares) at Dec. 31, 2015	77	77
Balance at Dec. 31, 2015	$ 22,535	$ 0	6,403	16,906	(908)	134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,076	0	0	2,062	0	14
Other comprehensive income (loss)	(110)	0	0	0	(110)	0
Distributions	(14)	0	0	0	0	(14)
Other equity transactions	$ 9	$ 0	1	0	0	8
Balance (shares) at Sep. 30, 2016	77	77
Balance at Sep. 30, 2016	$ 24,496	$ 0	$ 6,404	$ 18,968	$ (1,018)	$ 142

Consolidated Statements of Ch25

Consolidated Statements of Changes in Equity - PacifiCorp - USD ($) $ in Millions	Total	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, 2014		$ 7,756	$ 2	$ 0	$ 4,479	$ 3,288	$ (13)
Net Income (Loss) Attributable to Parent	$ 1,901	550				550
Dividends, Common Stock, Cash		(950)				(950)
Stockholders' Equity Attributable to Parent at Sep. 30, 2015		7,356	2	0	4,479	2,888	(13)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401	7,503	2	0	4,479	3,033	(11)
Net Income (Loss) Attributable to Parent	2,062	594				594
Dividends, Common Stock, Cash		(550)				(550)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016	$ 24,354	$ 7,547	$ 2	$ 0	$ 4,479	$ 3,077	$ (11)

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]	MidAmerican Energy Company [Member]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2014					$ 4,250	$ 561	$ 3,712	$ (23)
Net Income (Loss) Attributable to Parent	$ 1,901				459		459
Other comprehensive income (loss)	(303)	$ 0	$ 0	$ (303)	(7)			(7)
Stockholders' Equity, Other	(12)	0	0	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2015					4,702	561	4,171	(30)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401				4,705	561	4,174	(30)
Net Income (Loss) Attributable to Parent	2,062				527		527
Other comprehensive income (loss)	(110)	0	0	(110)	2			2
Dividend, noncash, transfer of operations					90		117	27
Stockholders' Equity, Other	9	$ 0	$ 0	$ 0	(1)		(1)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016	$ 24,354				$ 5,143	$ 561	$ 4,583	$ (1)

Consolidated Statements of Ch27

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]	MidAmerican Funding, LLC and Subsidiaries [Domain]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2014					$ 5,073	$ 1,679	$ 3,417	$ (23)
Net Income (Loss) Attributable to Parent	$ 1,901				459		459
Other comprehensive income (loss)	(303)	$ 0	$ 0	$ (303)	(7)			(7)
Stockholders' Equity Attributable to Parent at Sep. 30, 2015					5,525	1,679	3,876	(30)
Stockholders' Equity, Other	(12)	(8)	0	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401				5,525	1,679	3,876	(30)
Net Income (Loss) Attributable to Parent	2,062				518		518
Other comprehensive income (loss)	(110)	0	0	(110)	2			2
Stockholders' Equity Note, Spinoff Transaction					27			27
Stockholders' Equity Attributable to Parent at Sep. 30, 2016	24,354				6,071	$ 1,679	4,393	$ (1)
Stockholders' Equity, Other	$ 9	$ 1	$ 0	$ 0	$ (1)		$ (1)

Consolidated Statements of Ch28

Consolidated Statements of Changes in Equity - NPC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [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, 2014		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2014						$ 2,888	$ 0	$ 2,308	$ 583	$ (3)
Net Income (Loss) Attributable to Parent	$ 1,901					271			271
Balance (shares) at Sep. 30, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2015						3,145	$ 0	2,308	840	(3)
Dividends, Common Stock, Cash						13			13
Stockholders' Equity, Other	$ (12)	$ 0	$ (8)	$ 0	$ 0	$ (1)			(1)
Balance (shares) at Dec. 31, 2015	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 22,401					$ 3,163	$ 0	2,308	858	(3)
Net Income (Loss) Attributable to Parent	$ 2,062					$ 257			257
Balance (shares) at Sep. 30, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016	$ 24,354					$ 3,054	$ 0	$ 2,308	749	$ (3)
Dividends, Common Stock, Cash						365			365
Stockholders' Equity, Other	$ 9	$ 0	$ 1	$ 0	$ 0	$ (1)			$ (1)

Consolidated Statements of Ch29

Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [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, 2014		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2014						$ 998	$ 0	$ 1,111	$ (111)	$ (2)
Net Income (Loss) Attributable to Parent	$ 1,901					68
Dividends, Common Stock, Cash						7	$ 0		7	0
Balance (shares) at Sep. 30, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2015						$ 1,059	$ 0	1,111	(50)	(2)
Stockholders' Equity, Other	$ 12	$ 0	$ 8	$ 0	$ 0
Balance (shares) at Dec. 31, 2015	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 22,401					$ 1,076	$ 0	1,111	(35)	0
Net Income (Loss) Attributable to Parent	$ 2,062					65			65
Dividends, Common Stock, Cash						$ 45			45
Balance (shares) at Sep. 30, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016	$ 24,354					$ 1,095	$ 0	$ 1,111	$ (15)	(1)
Stockholders' Equity, Other	$ (9)	$ 0	$ (1)	$ 0	$ 0	$ (1)				$ 1

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 2,087	$ 1,924
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	1,922	1,814
Allowance for equity funds	(147)	(84)
Equity income, net of distributions	(62)	(38)
Increase (Decrease) in Regulatory Assets and Liabilities	41	326
Deferred income taxes and amortization of investment tax credits	546	617
Other, net	(60)	41
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(348)	(251)
Derivative collateral, net	22	8
Pension and other postretirement benefit plans	(73)	(9)
Accrued property, income and other taxes	713	1,608
Accounts payable and other liabilities	183	(47)
Net cash flows from operating activities	4,824	5,909
Cash flows from investing activities:
Capital expenditures	(3,521)	(4,251)
Acquisitions, net of cash acquired	(66)	(157)
Increase in restricted cash and investments	(48)	(64)
Purchases of available-for-sale securities	(98)	(132)
Proceeds from sales of available-for-sale securities	125	123
Equity method investments	(462)	(32)
Other, net	(47)	67
Net cash flows from investing activities	(4,117)	(4,446)
Cash flows from financing activities:
Repayments of Subordinated Debt	1,500	600
Common stock purchases	0	(36)
Proceeds from subsidiary debt	1,484	1,468
Repayments of subsidiary debt	(1,613)	(712)
Net proceeds from (repayments of) short-term debt	887	(473)
Other, net	(50)	(75)
Net cash flows from financing activities	(792)	(428)
Effect of exchange rate changes	(5)	(1)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	$ 1,018	$ 1,651

Consolidated Statements of Ca31

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,062	$ 1,901
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(147)	(84)
Deferred income taxes and amortization of investment tax credits	546	617
Increase (Decrease) in Regulatory Assets and Liabilities	41	326
Other Noncash Income (Expense)	(60)	41
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(348)	(251)
Derivative collateral, net	22	8
Accounts payable and other liabilities	183	(47)
Net cash flows from operating activities	4,824	5,909
Capital expenditures	(3,521)	(4,251)
Other, net	(47)	67
Net cash flows from investing activities	(4,117)	(4,446)
Net proceeds from (repayments of) short-term debt	887	(473)
Other, net	(50)	(75)
Net cash flows from financing activities	(792)	(428)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,018	1,651
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	594	550
Utilities Operating Expense, Depreciation and Amortization	576	567
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(21)	(26)
Deferred income taxes and amortization of investment tax credits	76	32
Increase (Decrease) in Regulatory Assets and Liabilities	85	41
Other Noncash Income (Expense)	6	7
Increase (Decrease) in Accounts Receivable and Other Operating Assets	19	14
Derivative collateral, net	2	(42)
Increase (Decrease) in Inventories	(32)	(3)
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	133	250
Accounts payable and other liabilities	(66)	121
Net cash flows from operating activities	1,372	1,511
Capital expenditures	(586)	(640)
Other, net	26	(8)
Net cash flows from investing activities	(560)	(648)
Proceeds from Issuance of Long-term Debt	0	250
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(56)	(116)
Net proceeds from (repayments of) short-term debt	(20)	(20)
Payments of Ordinary Dividends, Common Stock	(550)	(950)
Other, net	0	(3)
Net cash flows from financing activities	(626)	(839)
Net change in cash and cash equivalents	186	24
Cash and cash equivalents at beginning of period	12	23
Cash and cash equivalents at end of period	$ 198	$ 47

Statements of Cash Flows - MEC

Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,062	$ 1,901
Deferred income taxes and amortization of investment tax credits	546	617
Other Noncash Income (Expense)	60	(41)
Increase (Decrease) in Counterparty Collateral, Net	(22)	(8)
Pension and other postretirement benefit plans	(73)	(9)
Accrued property, income and other taxes	713	1,608
Net cash flows from operating activities	4,824	5,909
Payments to Acquire Property, Plant, and Equipment	3,521	4,251
Payments to Acquire Available-for-sale Securities	98	132
Proceeds from sales of available-for-sale securities	125	123
Payments for (Proceeds from) Other Investing Activities	47	(67)
Net cash flows from investing activities	(4,117)	(4,446)
Net proceeds from (repayments of) short-term debt	887	(473)
Other, net	(50)	(75)
Net cash flows from financing activities	(792)	(428)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,018	1,651
MidAmerican Energy Company [Member]
Proceeds from Issuance of Long-term Debt	33	0
Net Income (Loss) Attributable to Parent	527	459
Utilities Operating Expense, Depreciation and Amortization	338	300
Deferred income taxes and amortization of investment tax credits	113	24
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(34)	(36)
Other Noncash Income (Expense)	42	7
Increase (Decrease) in Accounts and Other Receivables	67	(49)
Increase (Decrease) in Inventories	26	33
Increase (Decrease) in Counterparty Collateral, Net	(4)	(49)
Pension and other postretirement benefit plans	(5)	(6)
Increase (Decrease) in Accounts Payable	14	(78)
Accrued property, income and other taxes	160	341
Increase (Decrease) in Other Current Assets and Liabilities, Net	(30)	(16)
Net cash flows from operating activities	1,080	1,150
Payments to Acquire Property, Plant, and Equipment	1,129	880
Payments to Acquire Available-for-sale Securities	96	91
Proceeds from sales of available-for-sale securities	92	83
Payments for (Proceeds from) Other Investing Activities	(5)	(4)
Net cash flows from investing activities	(1,128)	(884)
Repayments of Long-term Debt	38	0
Net proceeds from (repayments of) short-term debt	0	(50)
Net cash flows from financing activities	(5)	(50)
Net change in cash and cash equivalents	(53)	216
Cash and cash equivalents at beginning of period	103	29
Cash and cash equivalents at end of period	$ 50	$ 245

Consolidated Statements of Ca33

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,062	$ 1,901
Deferred income taxes and amortization of investment tax credits	546	617
Other Noncash Income (Expense)	60	(41)
Increase (Decrease) in Counterparty Collateral, Net	(22)	(8)
Pension and other postretirement benefit plans	(73)	(9)
Accrued property, income and other taxes	713	1,608
Net cash flows from operating activities	4,824	5,909
Payments to Acquire Property, Plant, and Equipment	3,521	4,251
Payments to Acquire Available-for-sale Securities	98	132
Proceeds from sales of available-for-sale securities	125	123
Payments for (Proceeds from) Other Investing Activities	47	(67)
Net cash flows from investing activities	(4,117)	(4,446)
Net proceeds from (repayments of) short-term debt	887	(473)
Other, net	(50)	(75)
Net cash flows from financing activities	(792)	(428)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,018	1,651
MidAmerican Funding, LLC and Subsidiaries [Domain]
Proceeds from Issuance of Long-term Debt	33
Net Income (Loss) Attributable to Parent	518	459
Utilities Operating Expense, Depreciation and Amortization	338	300
Deferred income taxes and amortization of investment tax credits	113	25
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(34)	(36)
Other Noncash Income (Expense)	42	20
Increase (Decrease) in Accounts and Other Receivables	67	(50)
Increase (Decrease) in Inventories	26	33
Increase (Decrease) in Counterparty Collateral, Net	(4)	(49)
Pension and other postretirement benefit plans	(5)	(6)
Increase (Decrease) in Accounts Payable	14	(78)
Accrued property, income and other taxes	160	341
Increase (Decrease) in Other Current Assets and Liabilities, Net	(24)	(11)
Net cash flows from operating activities	1,065	1,134
Payments to Acquire Property, Plant, and Equipment	1,129	880
Payments to Acquire Available-for-sale Securities	96	91
Proceeds from sales of available-for-sale securities	92	83
Proceeds from Sale of Other Assets, Investing Activities	0	13
Payments for (Proceeds from) Other Investing Activities	(5)	(4)
Net cash flows from investing activities	(1,128)	(871)
Repayments of Long-term Debt	38	0
Increase (Decrease) in Notes Payable, Related Parties, Current	16	3
Net proceeds from (repayments of) short-term debt	0	(50)
Net cash flows from financing activities	11	(47)
Net change in cash and cash equivalents	(52)	216
Cash and cash equivalents at beginning of period	103	30
Cash and cash equivalents at end of period	$ 51	$ 246

Consolidated Statements of Ca34

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,062	$ 1,901
Deferred income taxes and amortization of investment tax credits	546	617
Allowance for equity funds	(147)	(84)
Increase (Decrease) in Regulatory Assets and Liabilities	41	326
Other Noncash Income (Expense)	60	(41)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	348	251
Accrued property, income and other taxes	713	1,608
Accounts payable and other liabilities	183	(47)
Net cash flows from operating activities	4,824	5,909
Payments to Acquire Property, Plant, and Equipment	3,521	4,251
Payments for (Proceeds from) Other Investing Activities	47	(67)
Net cash flows from investing activities	(4,117)	(4,446)
Net cash flows from financing activities	(792)	(428)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at end of period	1,018	1,651
Cash and cash equivalents at beginning of period	1,108	617
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	257	271
Other Nonrecurring (Income) Expense	0	(3)
Utilities Operating Expense, Depreciation and Amortization	227	222
Deferred income taxes and amortization of investment tax credits	52	123
Allowance for equity funds	(3)	(3)
Increase (Decrease) in Regulatory Assets and Liabilities	139	(8)
Deferred Energy Change	(3)	133
Amortization of Deferred Charges	(87)	(40)
Other Noncash Income (Expense)	(3)	3
Increase (Decrease) in Accounts Receivable and Other Operating Assets	96	204
Increase (Decrease) in Inventories	(7)	(10)
Accrued property, income and other taxes	98	36
Accounts payable and other liabilities	7	8
Net cash flows from operating activities	601	622
Payments to Acquire Property, Plant, and Equipment	249	214
Proceeds from Sale of Other Property, Plant, and Equipment	0	9
Payments for (Proceeds from) Other Investing Activities	0	(10)
Net cash flows from investing activities	(249)	(195)
Repayments of Long-term Debt	221	260
Payments of Ordinary Dividends, Common Stock	365	13
Net cash flows from financing activities	(586)	(273)
Net change in cash and cash equivalents	(234)	154
Cash and cash equivalents at end of period	302	374
Cash and cash equivalents at beginning of period	$ 536	$ 220

Consolidated Statements of Ca35

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,062	$ 1,901
Increase (Decrease) in Allowance for Equity Funds Used During Construction	147	84
Deferred income taxes and amortization of investment tax credits	546	617
Increase (Decrease) in Regulatory Assets and Liabilities	41	326
Other Noncash Income (Expense)	60	(41)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(348)	(251)
Accrued property, income and other taxes	713	1,608
Accounts payable and other liabilities	183	(47)
Net cash flows from operating activities	4,824	5,909
Payments to Acquire Property, Plant, and Equipment	3,521	4,251
Payments for (Proceeds from) Other Investing Activities	47	(67)
Net cash flows from investing activities	(4,117)	(4,446)
Net cash flows from financing activities	(792)	(428)
Net change in cash and cash equivalents	(90)	1,034
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,018	1,651
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	65	68
Utilities Operating Expense, Depreciation and Amortization	88	84
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(2)	(2)
Deferred income taxes and amortization of investment tax credits	37	38
Increase (Decrease) in Regulatory Assets and Liabilities	(14)	(19)
Deferred Energy Change	55	68
Amortization of Deferred Charges	35	20
Other Noncash Income (Expense)	1	(2)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	12	11
Increase (Decrease) in Inventories	1	0
Accrued property, income and other taxes	0	(1)
Accounts payable and other liabilities	(15)	22
Net cash flows from operating activities	191	291
Payments to Acquire Property, Plant, and Equipment	137	153
Payments for (Proceeds from) Other Investing Activities	0	(2)
Net cash flows from investing activities	(137)	(151)
Proceeds from Issuance of Long-term Debt	1,089	0
Repayments of Long-term Debt	(1,137)	(1)
Payments of Ordinary Dividends, Common Stock	45	7
Net cash flows from financing activities	(93)	(8)
Net change in cash and cash equivalents	(39)	132
Cash and cash equivalents at beginning of period	106	22
Cash and cash equivalents at end of period	$ 67	$ 154

General

General	9 Months Ended
	Sep. 30, 2016
Segment Reporting Information [Line Items]
General/Organization and Operations	General Berkshire Hathaway Energy Company (" BHE ") is a holding company that owns subsidiaries principally engaged in energy businesses (collectively with its subsidiaries, the "Company"). BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The Company's operations are organized and managed 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 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 selling power generated from solar, wind, geothermal and hydroelectric sources under long-term contracts, 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 September 30, 2016 and for the three- and nine-month periods ended September 30, 2016 and 2015 . The results of operations for the three- and nine-month periods ended September 30, 2016 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, 2015 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 nine-month period ended September 30, 2016 .
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 the states 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 September 30, 2016 and for the three- and nine-month periods ended September 30, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2016 and 2015 . The results of operations for the three- and nine-month periods ended September 30, 2016 and 2015 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, 2015 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 nine-month period ended September 30, 2016 .
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 September 30, 2016 , and for the three- and nine-month periods ended September 30, 2016 and 2015 . Certain amounts in the prior period Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three- and nine-month periods ended September 30, 2016 , 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, 2015 , 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 nine-month period ended September 30, 2016 .
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 September 30, 2016 , and for the three- and nine-month periods ended September 30, 2016 and 2015 . Certain amounts in the prior period Consolidated Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three- and nine-month periods ended September 30, 2016 , 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, 2015 , 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 nine-month period ended September 30, 2016 .
Nevada Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	Organization and Operations Nevada Power Company, together with its subsidiaries ("Nevada Power"), is a wholly owned subsidiary of NV Energy, Inc. ("NV Energy"), a holding company that also owns Sierra Pacific Power Company ("Sierra Pacific") and certain other subsidiaries. Nevada Power is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers, primarily in 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 September 30, 2016 and for the three- and nine-month periods ended September 30, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2016 and 2015 . Certain amounts in the prior period Consolidated Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three- and nine-month periods ended September 30, 2016 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 Nevada Power's Item 8 Notes to Consolidated Financial Statements included in BHE's Annual Report on Form 10-K for the year ended December 31, 2015 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 nine-month period ended September 30, 2016 .
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	Organization and Operations 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 September 30, 2016 and for the three- and nine-month periods ended September 30, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2016 and 2015 . Certain amounts in the prior period Consolidated Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three- and nine-month periods ended September 30, 2016 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 Sierra Pacific's Item 8 Notes to Consolidated Financial Statements included in BHE's Annual Report on Form 10-K for the year ended December 31, 2015 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 nine-month period ended September 30, 2016 .

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-15, which amends FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. The Company is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet 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 May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize 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. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. 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.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-15, which amends FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted and is required to be adopted retrospectively. PacifiCorp is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. PacifiCorp is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize 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. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. PacifiCorp is currently evaluating the impact of adopting this guidance 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 August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-15, which amends FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy is currently evaluating the impact of adopting this guidance on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. 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 is currently evaluating the impact of adopting this guidance on its Financial Statements and disclosures included within Notes to Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. MidAmerican Energy is currently evaluating the impact of adopting this guidance on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize 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. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No.2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. MidAmerican Energy is currently evaluating the impact of adopting this guidance 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 August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-15, which amends FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Nevada Power is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize 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. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Nevada Power is currently evaluating the impact of adopting this guidance 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 August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-15, which amends FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Sierra Pacific is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize 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. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Sierra Pacific is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	9 Months Ended
	Sep. 30, 2016
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 September 30, December 31, Life 2016 2015 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 70,316 $ 69,248 Interstate natural gas pipeline assets 3-80 years 6,866 6,755 77,182 76,003 Accumulated depreciation and amortization (23,305 ) (22,682 ) Regulated assets, net 53,877 53,321 Nonregulated assets: Independent power plants 5-30 years 5,073 4,751 Other assets 3-30 years 983 875 6,056 5,626 Accumulated depreciation and amortization (1,000 ) (805 ) Nonregulated assets, net 5,056 4,821 Net operating assets 58,933 58,142 Construction work-in-progress 3,175 2,627 Property, plant and equipment, net $ 62,108 $ 60,769 Construction work-in-progress includes $2.6 billion as of September 30, 2016 and $2.3 billion as of December 31, 2015 , 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 nonregulated property gross of $22 million as of September 30, 2016 and December 31, 2015 , and related accumulated depreciation and amortization of $9 million and $8 million as of September 30, 2016 and December 31, 2015 , respectively, which consisted primarily of a corporate aircraft owned by MHC.
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of September 30, December 31, Depreciable Life 2016 2015 Utility plant in service, net: Generation 20-70 years $ 10,601 $ 10,404 Transmission 52-70 years 1,479 1,305 Electric distribution 20-70 years 3,138 3,059 Gas distribution 28-70 years 1,542 1,507 Utility plant in service 16,760 16,275 Accumulated depreciation and amortization (5,357 ) (5,229 ) Utility plant in service, net 11,403 11,046 Nonregulated property, net: Nonregulated property gross 5-45 years 7 15 Accumulated depreciation and amortization (1 ) (5 ) Nonregulated property, net 6 10 11,409 11,056 Construction work in progress 1,044 667 Property, plant and equipment, net $ 12,453 $ 11,723
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 September 30, December 31, Depreciable Life 2016 2015 Property, plant and equipment in-service 5-75 years $ 27,051 $ 26,757 Accumulated depreciation and amortization (8,658 ) (8,360 ) Net property, plant and equipment in-service 18,393 18,397 Construction work-in-progress 654 629 Total property, plant and equipment, net $ 19,047 $ 19,026
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 September 30, December 31, 2016 2015 Utility plant: Generation 30 - 55 years $ 4,222 $ 4,212 Distribution 20 - 65 years 3,208 3,118 Transmission 45 - 65 years 1,838 1,788 General and intangible plant 5 - 65 years 738 694 Utility plant 10,006 9,812 Accumulated depreciation and amortization (3,144 ) (2,971 ) Utility plant, net 6,862 6,841 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 2 2 Plant, net 6,864 6,843 Construction work-in-progress 107 153 Property, plant and equipment, net $ 6,971 $ 6,996
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 September 30, December 31, 2016 2015 Utility plant: Electric generation 30 - 60 years $ 1,137 $ 1,134 Electric distribution 20 - 70 years 1,411 1,382 Electric transmission 50 - 70 years 757 739 Electric general and intangible plant 5 - 65 years 164 139 Natural gas distribution 40 - 70 years 378 374 Natural gas general and intangible plant 8 - 10 years 15 13 Common general 5 - 65 years 267 265 Utility plant 4,129 4,046 Accumulated depreciation and amortization (1,419 ) (1,368 ) Utility plant, net 2,710 2,678 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 6 — Plant, net 2,716 2,678 Construction work-in-progress 85 88 Property, plant and equipment, net $ 2,801 $ 2,766

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2016
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters In November 2014, ALP filed a general tariff application ("GTA") asking the Alberta Utilities Commission ("AUC") to approve revenue requirements of C$811 million for 2015 and C$1.0 billion for 2016, primarily due to continued investment in capital projects as directed by the Alberta Electric System Operator. ALP amended the GTA in June 2015 to propose transmission tariff relief measures for customers and modifications to its capital structure. ALP also amended the GTA in October 2015. In May 2016, the AUC issued Decision 3524-D01-2016 pertaining to the 2015-2016 GTA. ALP filed its 2015-2016 GTA compliance filing in July 2016 in response to the AUC's decision. Following the AUC's assessment of whether the refiling complies with the decision, final transmission tariff rates for the 2015 and 2016 test years will be set, subject to further adjustment through the deferral account reconciliation process. The compliance filing asks the AUC to approve revenue requirements of C$599 million for 2015 and C$685 million for 2016. The decreased revenue requirements requested in the compliance filing, as compared to the original 2015-2016 GTA filing in November 2014, were based on changes to several key components considered in Decision 3524-D01-2016. Among other things, the AUC approved ALP's proposed immediate tariff relief of C$415 million for customers for 2015 and 2016, through (i) the discontinuance of construction work-in-progress ("CWIP") in rate base and the return to allowance for funds used during construction ("AFUDC") accounting effective January 1, 2015, resulting in a C$82 million reduction of revenue requirement and the refund of C$277 million previously collected as CWIP in rate base as part of ALP's transmission tariffs during 2011-2014 less related returns of C$12 million and (ii) a change to the flow through method for calculating income taxes for 2016, resulting in further tariff relief of C$68 million . In July 2016, ALP also submitted a separate transmission tariff application requesting approval from the AUC to reduce the 2016 interim refundable tariff from C$61 million per month to C$12 million per month for the period August 1, 2016 to December 31, 2016, in alignment with its compliance filing. The AUC approved the reduced 2016 monthly interim refundable tariff amount in August 2016. Operating revenue for the nine-month period ended September 30, 2016, included a one-time reduction of $200 million from the 2015-2016 GTA decision received in May 2016 at ALP. The decision requires ALP to refund $200 million to customers by the end of 2016 through reduced monthly billings for the change from receiving cash during construction for the return on CWIP in rate base to recording allowance for borrowed and equity funds used during construction related to construction expenditures during the 2011 to 2014 time period. This amount is offset with higher capitalized interest and allowance for equity funds in the Consolidated Statements of Operations. In addition, the decision requires ALP to change to the flow through method of recognizing income tax expense effective January 1, 2016. This change reduced operating revenue by $11 million and $36 million , respectively, for the three- and nine-month periods ended September 30, 2016, with offsetting impacts to income tax expense in the Consolidated Statements of Operations.
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 Public Utilities Commission of Nevada ("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. Chapter 704B Applications In May 2015, three customers, including MGM Resorts International ("MGM") and Wynn Las Vegas, LLC ("Wynn"), filed applications to purchase energy from a provider of a new electric resource and become distribution only service customers. In December 2015, the PUCN granted the applications subject to conditions, including paying an impact fee, on-going charges and receiving approval for specific alternative energy providers and terms. The costs associated with the impact fee and on-going charges were assessed to reimburse Nevada Power for the customers' share of previously committed investments and long-term renewable contracts. The impact fee is set at a level designed such that the remaining customers are not subjected to increased costs. In December 2015, the customers filed petitions for reconsideration. In January 2016, the PUCN granted reconsideration and updated some of the terms, including removing a limitation related to energy purchased indirectly from NV Energy. In June 2016, MGM and Wynn made the required compliance filings and the PUCN issued orders allowing the customers to acquire electric energy and ancillary services from another energy supplier and become distribution only service customers of Nevada Power. The third customer did not make its compliance filing before the required deadline. In September 2016, MGM and Wynn paid impact fees totaling $97 million . In October 2016, MGM and Wynn became distribution only service customers and started procuring energy from another energy supplier. Nevada Power has deferred recognition of $92 million of the impact fee which is included in noncurrent regulatory liabilities on the Consolidated Balance Sheet as of September 30, 2016 . The majority of the deferred impact fee will be amortized over six years as ordered by the PUCN. The remaining $5 million will be remitted to the government for assessed fees or applied to an existing regulatory asset.
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 Public Utilities Commission of Nevada ("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.

Investments and Restricted Cash

Investments and Restricted Cash and Investments	9 Months Ended
	Sep. 30, 2016
Investments and Restricted Cash and Investments [Abstract]
Investments and Restricted Cash and Investments	Investments and Restricted Cash and Investments Investments and restricted cash and investments consists of the following (in millions): As of September 30, December 31, 2016 2015 Investments: BYD Company Limited common stock $ 1,477 $ 1,238 Rabbi trusts 398 380 Other 162 130 Total investments 2,037 1,748 Equity method investments: Electric Transmission Texas, LLC 647 585 BHE Renewables tax equity investments 635 168 Bridger Coal Company 168 190 Other 157 160 Total equity method investments 1,607 1,103 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 454 429 Solar Star and Topaz Projects 116 95 Other 161 129 Total restricted cash and investments 731 653 Total investments and restricted cash and investments $ 4,375 $ 3,504 Reflected as: Current assets $ 228 $ 137 Noncurrent assets 4,147 3,367 Total investments and restricted cash and investments $ 4,375 $ 3,504 Investments BHE's investment in BYD Company Limited common stock is accounted for as an available-for-sale security with changes in fair value recognized in accumulated other comprehensive income (loss) ("AOCI"). The fair value of BHE's investment in BYD Company Limited common stock reflects a pre-tax unrealized gain of $1.2 billion and $1.0 billion as of September 30, 2016 and December 31, 2015 , respectively.

Recent Financing Transactions

Recent Financing Transactions	9 Months Ended
	Sep. 30, 2016
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In September and March 2016, BHE repaid at par value a total of $1 billion , plus accrued interest, of its junior subordinated debentures due December 2043, and in June 2016, BHE repaid at par value $500 million , plus accrued interest, of its junior subordinated debentures due December 2044. In June 2016, Marshall Wind Energy, LLC issued a $95 million Term Loan due June 2026 with principal payments beginning December 2016. The Term Loan has an underlying variable interest rate based on London Interbank Offered Rate ("LIBOR") plus a fixed credit spread with a one-time increase during the term of the loan. The Company has entered into interest rate swaps that fix the underlying interest rate on 100% of the outstanding debt. In May 2016, ALP issued C$350 million of its 2.747% Series 2016-1 Medium-Term Notes due May 2026. The net proceeds were used to repay short-term debt. In May 2016, Sierra Pacific issued $205 million of its variable-rate tax-exempt Revenue Bonds due 2029-2036 and $139 million of its 1.25% - 3.00% Revenue Bonds due 2029-2036. Sierra Pacific also purchased $125 million of the variable-rate tax-exempt Revenue Bonds due 2029-2036 on their date of issuance to hold for its own account and potential remarketing to the public at a future date. To provide collateral security for its obligations, Sierra Pacific issued its General and Refunding Securities, Series V, Nos. V-1, V-2 and V-3, in the collective amount of $344 million . The collective proceeds from the tax-exempt bond issuances were used in April and May 2016 to refund at par value, plus accrued interest, $349 million of tax-exempt Revenue Bonds due 2029-2036 previously issued on behalf of Sierra Pacific. In April 2016, Sierra Pacific issued $400 million of its 2.60% General and Refunding Securities, Series U, due May 2026. The net proceeds were used, together with cash on hand, to pay at maturity the $450 million principal amount of 6.00% General and Refunding Securities, Series M, in May 2016. Credit Facilities In June 2016, BHE replaced its $1.4 billion and $600 million unsecured revolving credit facilities, which had been set to expire in June 2017, with a $2.0 billion unsecured credit facility with a stated maturity of June 2019 and two one-year extension options subject to bank consent. The credit facility, which is for general corporate purposes and also supports BHE's commercial paper program and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at BHE's option, plus a spread that varies based on BHE's senior unsecured long-term debt credit ratings. The credit facility requires that BHE's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.70 to 1.0 as of the last day of each quarter. In June 2016, PacifiCorp replaced its $600 million unsecured revolving credit facility, which had been set to expire in June 2017, with a $400 million unsecured credit facility with a stated maturity of June 2019 and two one-year extension options subject to bank consent. The credit facility, which supports PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. The credit facility requires that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of September 30, 2016 , PacifiCorp had no borrowings outstanding or letters of credit issued under this credit facility. In March 2016, Solar Star Funding, LLC amended its $320 million letter of credit facility reducing the amount available to $301 million and extending the maturity date to March 2026. As of September 30, 2016 , Solar Star Funding, LLC had $284 million of letters of credit issued under this facility.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In June 2016, PacifiCorp replaced its $600 million unsecured revolving credit facility, which had been set to expire in June 2017, with a $400 million unsecured credit facility with a stated maturity of June 2019 and two one-year extension options subject to bank consent. The credit facility, which supports PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the London Interbank Offered Rate ("LIBOR") or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. The credit facility requires that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of September 30, 2016 , PacifiCorp had no borrowings outstanding or letters of credit issued under this credit facility.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	( 5 ) Recent Financing Transactions In September 2016, the Iowa Finance Authority issued $33 million of variable-rate tax-exempt Pollution Control Facilities Refunding Revenue Bonds due September 2036, the proceeds of which were loaned to MidAmerican Energy to refinance, in September 2016, variable-rate tax-exempt pollution control refunding revenue bonds totaling $29 million due September 2016 and $4 million due March 2017, which were optionally redeemed in full. The interest rate on the new bonds will initially be reset on a weekly basis through remarketing of the bonds in the short-term tax-exempt market. MidAmerican Energy is contractually responsible for the timely payment of principal and interest on the bonds.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	( 5 ) 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 In May 2016, Sierra Pacific entered into a Financing Agreement with Washoe County, Nevada (the "Washoe Issuer") whereby the Washoe Issuer loaned to Sierra Pacific the proceeds from the issuance, on behalf of Sierra Pacific, of $30 million of its variable-rate tax-exempt Water Facilities Refunding Revenue Bonds, Series 2016C, due 2036, $25 million of its variable-rate tax-exempt Water Facilities Refunding Revenue Bonds, Series 2016D, due 2036 and $25 million of its variable-rate tax-exempt Water Facilities Refunding Revenue Bonds, Series 2016E, due 2036 (collectively the "Series 2016CDE Bonds"). In May 2016, Sierra Pacific entered into a Financing Agreement with the Washoe Issuer whereby the Washoe Issuer loaned to Sierra Pacific the proceeds from the issuance, on behalf of Sierra Pacific, of $59 million of its 1.50% tax-exempt Gas Facilities Refunding Revenue Bonds, Series 2016A, due 2031, $60 million of its 3.00% tax-exempt Gas and Water Facilities Refunding Revenue Bonds, Series 2016B, due 2036, $75 million of its variable-rate tax-exempt Water Facilities Refunding Revenue Bonds, Series 2016F, due 2036 and $20 million of its variable-rate tax-exempt Water Facilities Refunding Revenue Bonds, Series 2016G, due 2036 (collectively the "Series 2016ABFG Bonds"). The Series 2016A bonds and Series 2016B bonds are subject to mandatory purchase by Sierra Pacific in June 2019 and June 2022, respectively, at which dates the interest rate mode may be adjusted from time to time. Sierra Pacific purchased the Series 2016F bonds and the Series 2016G bonds on their date of issuance to hold for its own account and potential remarketing to the public at a future date. In May 2016, Sierra Pacific entered into a Financing Agreement with Humboldt County, Nevada (the "Humboldt Issuer") whereby the Humboldt Issuer loaned to Sierra Pacific the proceeds from the issuance, on behalf of Sierra Pacific, of $20 million of its 1.25% tax-exempt Pollution Control Refunding Revenue Bonds, Series A, due 2029 and $30 million of its variable-rate tax-exempt Pollution Control Refunding Revenue Bonds, Series B, due 2029 (collectively the "Series 2016AB Bonds"). The Series A bonds are subject to mandatory purchase by Sierra Pacific in June 2019 at which date the interest rate mode may be adjusted from time to time. Sierra Pacific purchased the Series B bonds on their date of issuance to hold for its own account and potential remarketing to the public at a future date. To provide collateral security for its obligations, Sierra Pacific issued its General and Refunding Securities, Series V, No. V-1 in the amount of $80 million , No. V-2 in the amount of $214 million , and No. V-3 in the amount of $50 million (collectively the "Series V Notes"). The obligation of Sierra Pacific to make any payment of the principal and interest on any Series V Notes is discharged to the extent Sierra Pacific has made payment on the Series 2016CDE Bonds, Series 2016ABFG Bonds and Series 2016AB Bonds, respectively. The collective proceeds from the tax-exempt bond issuances were used in April and May 2016 to refund at par value, plus accrued interest, the Washoe Issuer's $40 million of Water Facilities Refunding Revenue Bonds Series, 2007A, due 2036, $40 million of Water Facilities Refunding Revenue Bonds, Series 2007B, due 2036, $59 million of Gas Facilities Refunding Revenue Bonds, Series 2006A, due 2031, $85 million of Gas and Water Facilities Refunding Revenue Bonds, Series 2006C, due 2036, and $75 million of Water Facilities Refunding Revenue Bonds, Series 2006B, due 2036, and the Humboldt Issuer's $50 million of Pollution Control Refunding Revenue Bonds, Series 2006, due 2029, each previously issued on behalf of Sierra Pacific. The Series 2006C and 2006 were previously held by Sierra Pacific. In April 2016, Sierra Pacific issued $400 million of its 2.60% General and Refunding Securities, Series U, due May 2026. The net proceeds were used, together with cash on hand, to pay at maturity the $450 million principal amount of 6.00% General and Refunding Securities, Series M, in May 2016.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes 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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (16 ) (9 ) (15 ) (11 ) State income tax, net of federal income tax benefit — — — 1 Income tax effect of foreign income (3 ) (1 ) (4 ) (4 ) Equity income 1 1 1 1 Other, net (1 ) (2 ) — (1 ) Effective income tax rate 16 % 24 % 17 % 21 % Income tax credits relate primarily to production tax credits from wind-powered generating facilities owned by MidAmerican Energy, PacifiCorp and BHE Renewables. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Income tax effect of foreign income includes, among other items, deferred income tax benefits of $16 million recognized in September 2016 upon the enactment of a reduction in the United Kingdom corporate income tax rate from 18% to 17% effective April 1, 2020. Berkshire Hathaway includes the Company in its United States federal income tax return. For the nine-month periods ended September 30, 2016 and 2015 , the Company received net cash payments for income taxes from Berkshire Hathaway totaling $860 million and $1.8 billion , respectively.
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit from continuing operations is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (58 ) (62 ) (58 ) (65 ) State income tax, net of federal income tax benefit (6 ) (10 ) (4 ) (7 ) Effects of ratemaking (1 ) (2 ) (3 ) (7 ) Other, net — — — — Effective income tax rate (30 )% (39 )% (30 )% (44 )% 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 $416 million and $513 million for the nine-month periods ended September 30, 2016 and 2015 , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes A reconciliation of the federal statutory income tax rate to MidAmerican Funding's effective income tax rate applicable to income before income tax benefit from continuing operations is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (60 ) (64 ) (61 ) (66 ) State income tax, net of federal income tax benefit (7 ) (11 ) (4 ) (7 ) Effects of ratemaking — (2 ) (3 ) (7 ) Other, net — 1 — — Effective income tax rate (32 )% (41 )% (33 )% (45 )% 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 $422 million and $515 million for the nine-month periods ended September 30, 2016 and 2015 , respectively.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Domestic Operations Net periodic benefit cost for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 7 $ 8 $ 22 $ 24 Interest cost 31 30 94 91 Expected return on plan assets (39 ) (42 ) (120 ) (127 ) Net amortization 12 13 36 41 Net periodic benefit cost $ 11 $ 9 $ 32 $ 29 Other postretirement: Service cost $ 2 $ 2 $ 7 $ 8 Interest cost 7 6 23 22 Expected return on plan assets (10 ) (10 ) (31 ) (33 ) Net amortization (2 ) (1 ) (9 ) (7 ) Net periodic benefit credit $ (3 ) $ (3 ) $ (10 ) $ (10 ) Employer contributions to the domestic pension and other postretirement benefit plans are expected to be $77 million and $1 million , respectively, during 2016 . As of September 30, 2016 , $73 million and $1 million of contributions had been made to the domestic pension and other postretirement benefit plans, respectively. Foreign Operations Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Service cost $ 5 $ 6 $ 16 $ 18 Interest cost 17 20 55 60 Expected return on plan assets (27 ) (29 ) (85 ) (87 ) Net amortization 11 17 34 49 Net periodic benefit cost $ 6 $ 14 $ 20 $ 40 Employer contributions to the United Kingdom pension plan are expected to be £41 million during 2016 . As of September 30, 2016 , £31 million , or $44 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 Net periodic benefit cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 1 $ 1 $ 3 $ 3 Interest cost 14 13 41 40 Expected return on plan assets (18 ) (19 ) (56 ) (58 ) Net amortization 8 10 25 31 Net periodic benefit cost $ 5 $ 5 $ 13 $ 16 Other postretirement: Service cost $ 1 $ — $ 2 $ 2 Interest cost 3 4 11 12 Expected return on plan assets (5 ) (5 ) (16 ) (17 ) Net amortization (1 ) (1 ) (4 ) (3 ) Net periodic benefit credit $ (2 ) $ (2 ) $ (7 ) $ (6 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $- million, respectively, during 2016 . As of September 30, 2016 , $3 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 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 cost (credit) for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 3 $ 3 $ 8 $ 9 Interest cost 8 8 25 24 Expected return on plan assets (11 ) (11 ) (33 ) (34 ) Net amortization — — 1 1 Net periodic benefit cost $ — $ — $ 1 $ — Other postretirement: Service cost $ 1 $ 2 $ 4 $ 5 Interest cost 2 1 7 6 Expected return on plan assets (3 ) (4 ) (10 ) (11 ) Net amortization (1 ) — (3 ) (2 ) Net periodic benefit credit $ (1 ) $ (1 ) $ (2 ) $ (2 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million , respectively, during 2016 . As of September 30, 2016 , $5 million and $1 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. Nevada Power contributed $36 million to the Qualified Pension Plan for the nine-months ended September 30, 2016 . Nevada Power did not make any contributions to the Qualified Pension Plan for the nine-months ended September 30, 2015 . 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 payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of September 30, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (7 ) $ (38 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (5 ) (5 )
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. Sierra Pacific contributed $27 million to the Qualified Pension Plan for the nine-months ended September 30, 2016 . Sierra Pacific did not make any contributions to the Qualified Pension Plan for the nine-months ended September 30, 2015 . 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 September 30, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (4 ) $ (29 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (8 ) (9 ) Other Postretirement Plans - Other long-term liabilities (32 ) (32 )

Asset Retirement Obligation Ass

Asset Retirement Obligation Asset Retirement Obligations (Notes)	9 Months Ended
	Sep. 30, 2016
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligation MidAmerican Energy estimates its asset retirement obligation ("ARO") liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. During the nine-month period ended September 30, 2016, MidAmerican Energy recorded an increase of $69 million to its ARO liability for the decommissioning of Quad Cities Generating Station Units 1 and 2 as a result of an updated decommissioning study reflecting changes in the estimated amount and timing of cash flow.
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [Text Block]	Asset Retirement Obligations MidAmerican Energy estimates its asset retirement obligation ("ARO") liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. During the nine-month period ended September 30, 2016, MidAmerican Energy recorded an increase of $69 million to its ARO liability for the decommissioning of Quad Cities Generating Station Units 1 and 2 as a result of an updated decommissioning study reflecting changes in the estimated amount and timing of cash flow.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations [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	9 Months Ended
	Sep. 30, 2016
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities The Company is exposed to the impact of market fluctuations in commodity prices, interest rates and foreign currency exchange rates. The Company is principally exposed to electricity, natural gas, coal and fuel oil commodity price risk primarily through BHE's ownership of PacifiCorp, MidAmerican Energy Company, Nevada Power Company and Sierra Pacific Power Company (the "Utilities") as they have an obligation to serve retail customer load in their regulated service territories. The Company also provides nonregulated retail electricity and natural gas services in competitive markets. The Utilities' 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, wholesale electricity that is purchased and sold, and natural gas supply for retail customers. 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, future debt issuances and mortgage commitments. Additionally, the Company is exposed to foreign currency exchange rate risk from its business operations and investments in Great Britain and Canada. The Company does not engage in a material amount of proprietary trading activities. Each of the Company's business platforms 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, the Company uses commodity derivative contracts, which may include forwards, futures, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. The Company 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, the Company may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, forward sale commitments, or mortgage interest rate lock commitments, to mitigate the Company's exposure to interest rate risk. The Company does not hedge all of its commodity price, interest rate and foreign currency exchange rate risks, thereby exposing the unhedged portion to changes in market prices. There have been no significant changes in the Company's accounting policies related to derivatives. Refer to Note 11 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 the Company'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 September 30, 2016 Not designated as hedging contracts: Commodity assets (1) $ 15 $ 81 $ 11 $ 2 $ 109 Commodity liabilities (1) (3 ) — (66 ) (164 ) (233 ) Interest rate assets 12 — — — 12 Interest rate liabilities — — (6 ) (14 ) (20 ) Total 24 81 (61 ) (176 ) (132 ) Designated as hedging contracts: Commodity assets — — 1 1 2 Commodity liabilities — — (21 ) (16 ) (37 ) Interest rate assets — — — — — Interest rate liabilities — — (4 ) (7 ) (11 ) Total — — (24 ) (22 ) (46 ) Total derivatives 24 81 (85 ) (198 ) (178 ) Cash collateral receivable — — 20 65 85 Total derivatives - net basis $ 24 $ 81 $ (65 ) $ (133 ) $ (93 ) Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2015 Not designated as hedging contracts: Commodity assets (1) $ 25 $ 72 $ 7 $ 2 $ 106 Commodity liabilities (1) (4 ) — (113 ) (175 ) (292 ) Interest rate assets 7 — — — 7 Interest rate liabilities — — (3 ) (6 ) (9 ) Total 28 72 (109 ) (179 ) (188 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (33 ) (17 ) (50 ) Interest rate assets — 3 — — 3 Interest rate liabilities — — (4 ) (1 ) (5 ) Total — 3 (36 ) (16 ) (49 ) Total derivatives 28 75 (145 ) (195 ) (237 ) Cash collateral receivable — — 40 63 103 Total derivatives - net basis $ 28 $ 75 $ (105 ) $ (132 ) $ (134 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2016 and December 31, 2015 , a net regulatory asset of $195 million and $250 million , respectively, was recorded related to the net derivative liability of $124 million and $186 million , respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables. Not Designated as Hedging Contracts The following table reconciles the beginning and ending balances of the Company'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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 185 $ 233 $ 250 $ 223 Changes in fair value recognized in net regulatory assets 18 47 5 104 Net losses reclassified to operating revenue (3 ) (11 ) (6 ) (4 ) Net losses reclassified to cost of sales (5 ) (16 ) (54 ) (70 ) Ending balance $ 195 $ 253 $ 195 $ 253 Designated as Hedging Contracts The Company uses commodity derivative contracts accounted for as cash flow hedges to hedge electricity and natural gas commodity prices for delivery to nonregulated customers, spring operational sales, natural gas storage and other transactions. Certain commodity derivative contracts have settled and the fair value at the date of settlement remains in AOCI and is recognized in earnings when the forecasted transactions impact earnings. The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 26 $ 38 $ 46 $ 32 Changes in fair value recognized in OCI 15 20 35 37 Net gains reclassified to operating revenue 1 1 1 4 Net losses reclassified to cost of sales (7 ) (14 ) (47 ) (28 ) Ending balance $ 35 $ 45 $ 35 $ 45 Realized gains and losses on hedges and hedge ineffectiveness are recognized in income as operating revenue, cost of sales, operating expense or interest expense depending upon the nature of the item being hedged. For the three- and nine-month periods ended September 30, 2016 and 2015 , hedge ineffectiveness was insignificant. As of September 30, 2016 , the Company had cash flow hedges with expiration dates extending through June 2026 and $24 million of pre-tax unrealized losses are forecasted to be reclassified from AOCI into earnings over the next twelve months as contracts settle. Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 2 10 Natural gas purchases Decatherms 321 317 Fuel purchases Gallons 3 11 Interest rate swaps US$ 730 653 Mortgage sale commitments, net US$ (375 ) (312 ) Credit Risk The Utilities are 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 the Utilities' counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, the Utilities analyze the financial condition of each significant wholesale counterparty, establish limits on the amount of unsecured credit to be extended to each counterparty and evaluate the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, the Utilities enter into netting and collateral arrangements that may include margining and cross-product netting agreements and obtain third-party guarantees, letters of credit and cash deposits. If required, the Utilities exercise 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 creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2016 , the applicable credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of the Company's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $227 million and $288 million as of September 30, 2016 and December 31, 2015 , respectively, for which the Company had posted collateral of $73 million and $75 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 September 30, 2016 and December 31, 2015 , the Company would have been required to post $139 million and $198 million , respectively, of additional collateral. The Company's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation, or other factors.
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 7 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 September 30, 2016 Not designated as hedging contracts (1) : Commodity assets $ 5 $ 2 $ 4 $ — $ 11 Commodity liabilities (2 ) — (27 ) (87 ) (116 ) Total 3 2 (23 ) (87 ) (105 ) Total derivatives 3 2 (23 ) (87 ) (105 ) Cash collateral receivable — — 14 59 73 Total derivatives - net basis $ 3 $ 2 $ (9 ) $ (28 ) $ (32 ) As of December 31, 2015 Not designated as hedging contracts (1) : Commodity assets $ 10 $ — $ 2 $ — $ 12 Commodity liabilities (1 ) — (58 ) (89 ) (148 ) Total 9 — (56 ) (89 ) (136 ) Total derivatives 9 — (56 ) (89 ) (136 ) Cash collateral receivable — — 18 57 75 Total derivatives - net basis $ 9 $ — $ (38 ) $ (32 ) $ (61 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2016 and December 31, 2015 , a regulatory asset of $102 million and $133 million , respectively, was recorded related to the net derivative liability of $105 million and $136 million , respectively. Not Designated as Hedging 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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 89 $ 99 $ 133 $ 85 Changes in fair value recognized in net regulatory assets 15 38 (4 ) 65 Net (losses) gains reclassified to operating revenue (2 ) 1 8 29 Net losses reclassified to energy costs — (10 ) (35 ) (51 ) Ending balance $ 102 $ 128 $ 102 $ 128 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 September 30, December 31, Measure 2016 2015 Electricity (sales) purchases Megawatt hours (6 ) 1 Natural gas purchases Decatherms 92 111 Fuel oil purchases Gallons 3 11 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 September 30, 2016 , 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 $109 million and $142 million as of September 30, 2016 and December 31, 2015 , respectively, for which PacifiCorp had posted collateral of $73 million and $75 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 September 30, 2016 and December 31, 2015 , PacifiCorp would have been required to post $28 million and $64 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.
MidAmerican Energy Company [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities MidAmerican Energy is exposed to the impact of market fluctuations in commodity prices and interest rates. MidAmerican Energy 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 territory. Prior to January 1, 2016, MidAmerican Energy also provided nonregulated retail electricity and natural gas services in competitive markets, which created contractual obligations to provide electric and natural gas services. MidAmerican Energy'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, wholesale electricity that is purchased and sold, and natural gas supply for retail customers. 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. MidAmerican Energy does not engage in a material amount of proprietary trading activities. MidAmerican Energy 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, MidAmerican Energy uses commodity derivative contracts, which may include forwards, futures, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. MidAmerican Energy 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, MidAmerican Energy may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate its exposure to interest rate risk. MidAmerican Energy 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 MidAmerican Energy's accounting policies related to derivatives. Refer to Note 10 for additional information on derivative contracts and to Note 3 for a discussion of discontinued operations. 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 MidAmerican Energy's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Balance Sheets (in millions): Other Current Assets Other Assets Other Current Liabilities Other Long-term Liabilities Total As of September 30, 2016: Not designated as hedging contracts (1)(2) : Commodity assets $ 2 $ — $ 3 $ — $ 5 Commodity liabilities — — (7 ) (2 ) (9 ) Total 2 — (4 ) (2 ) (4 ) Designated as hedging contracts (2) : Commodity assets — — — — — Commodity liabilities — — — — — Total — — — — — Total derivatives 2 — (4 ) (2 ) (4 ) Cash collateral receivable — — 1 — 1 Total derivatives - net basis $ 2 $ — $ (3 ) $ (2 ) $ (3 ) Other Current Assets Other Assets Other Current Liabilities Other Long- Term Liabilities Total As of December 31, 2015: Not designated as hedging contracts (1) : Commodity assets $ 12 $ 4 $ 5 $ 2 $ 23 Commodity liabilities (3 ) — (36 ) (10 ) (49 ) Total 9 4 (31 ) (8 ) (26 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (32 ) (17 ) (49 ) Total — — (31 ) (15 ) (46 ) Total derivatives 9 4 (62 ) (23 ) (72 ) Cash collateral receivable — — 22 6 28 Total derivatives - net basis $ 9 $ 4 $ (40 ) $ (17 ) $ (44 ) (1) MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2016 and December 31, 2015 , a net regulatory asset of $5 million and $20 million , respectively, was recorded related to the net derivative liability of $4 million and $26 million , respectively. (2) The changes in derivative values from December 31, 2015, are substantially due to the transfer of MidAmerican Energy's unregulated retail services business to a subsidiary of BHE. Not Designated as Hedging Contracts The following table reconciles the beginning and ending balances of MidAmerican Energy'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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 3 $ 28 $ 20 $ 38 Changes in fair value recognized in net regulatory assets 5 10 8 29 Net losses reclassified to operating revenue (1 ) (12 ) (14 ) (34 ) Net losses reclassified to cost of gas sold (2 ) (3 ) (9 ) (10 ) Ending balance $ 5 $ 23 $ 5 $ 23 Designated as Hedging Contracts MidAmerican Energy used commodity derivative contracts accounted for as cash flow hedges to hedge electricity and natural gas commodity prices related to its unregulated retail services business, which was transferred to a subsidiary of BHE. The following table reconciles the beginning and ending balances of MidAmerican Energy's accumulated other comprehensive loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ — $ 39 $ 45 $ 34 Transfer to affiliate — — (45 ) — Changes in fair value recognized in OCI — 21 — 40 Net gains reclassified to nonregulated cost of sales — (14 ) — (28 ) Ending balance $ — $ 46 $ — $ 46 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 September 30, December 31, Measure 2016 2015 Electricity purchases Megawatt hours — 15 Natural gas purchases Decatherms 17 17 Credit Risk MidAmerican Energy 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 MidAmerican Energy's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, MidAmerican Energy 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, MidAmerican Energy 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, MidAmerican Energy 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 MidAmerican Energy's collateral requirements on its 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 MidAmerican Energy's creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2016 , MidAmerican Energy's credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of MidAmerican Energy's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $7 million and $66 million as of September 30, 2016 and December 31, 2015 , respectively, for which MidAmerican Energy had posted collateral of $- million at each date. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of September 30, 2016 and December 31, 2015 , MidAmerican Energy would have been required to post $3 million and $55 million , respectively, of additional collateral. MidAmerican Energy's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation, or other factors. MidAmerican Energy's exposure to contingent features declined significantly as a result of the transfer of its unregulated retail services business to a subsidiary of BHE.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities Refer to Note 9 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities Nevada Power is exposed to the impact of market fluctuations in commodity prices and interest rates. Nevada Power is principally exposed to electricity, natural gas and coal market fluctuations primarily through Nevada Power's obligation to serve retail customer load in its regulated service territory. Nevada Power'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. The actual cost of fuel and purchased power is recoverable through the deferred energy mechanism. Interest rate risk exists on variable-rate debt and future debt issuances. Nevada Power does not engage in proprietary trading activities. Nevada Power 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, Nevada Power uses commodity derivative contracts, which may include forwards, futures, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. Nevada Power 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, Nevada Power may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate Nevada Power's exposure to interest rate risk. Nevada Power 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 Nevada Power's accounting policies related to derivatives. Refer to Note 7 for additional information on derivative contracts. The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power'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 Current Long-term Liabilities Liabilities Total As of September 30, 2016 Commodity liabilities (1) $ (9 ) $ (10 ) $ (19 ) As of December 31, 2015 Commodity liabilities (1) $ (8 ) $ (14 ) $ (22 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2016 and December 31, 2015 , a regulatory asset of $19 million and $22 million , respectively, was recorded related to the derivative liability of $19 million and $22 million , respectively. Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2016 2015 Electricity sales Megawatt hours (2 ) (2 ) Natural gas purchases Decatherms 143 126 Credit Risk Nevada Power 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 Nevada Power's counterparties have similar economic, industry or other characteristics and due to direct and indirect relationships among the counterparties. Before entering into a transaction, Nevada Power analyzes the financial condition of each significant wholesale counterparty, establish limits on the amount of unsecured credit to be extended to each counterparty and evaluate the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, Nevada Power enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtain third-party guarantees, letters of credit and cash deposits. If required, Nevada Power 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 unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide rights to demand cash or other security in the event of a credit rating downgrade ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance," in the event of a material adverse change in creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2016 , credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of Nevada Power's derivative contracts in liability positions with specific credit-risk-related contingent features was $3 million as of September 30, 2016 and December 31, 2015 , which represents the amount of collateral to be posted if all credit risk related contingent features for derivative contracts in liability positions had been triggered. Nevada Power'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	9 Months Ended
	Sep. 30, 2016
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 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 September 30, 2016 Assets: Commodity derivatives $ 1 $ 22 $ 88 $ (18 ) $ 93 Interest rate derivatives — 1 11 — 12 Mortgage loans held for sale — 443 — — 443 Money market mutual funds (2) 557 — — — 557 Debt securities: United States government obligations 156 — — — 156 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Auction rate securities — — 18 — 18 Equity securities: United States companies 249 — — — 249 International companies 1,483 — — — 1,483 Investment funds 174 — — — 174 $ 2,620 $ 509 $ 117 $ (18 ) $ 3,228 Liabilities: Commodity derivatives $ (4 ) $ (234 ) $ (32 ) $ 103 $ (167 ) Interest rate derivatives (1 ) (30 ) — — (31 ) $ (5 ) $ (264 ) $ (32 ) $ 103 $ (198 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 16 $ 93 $ (16 ) $ 93 Interest rate derivatives — 5 5 — 10 Mortgage loans held for sale — 327 — — 327 Money market mutual funds (2) 421 — — — 421 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 44 — 44 Equity securities: United States companies 239 — — — 239 International companies 1,244 — — — 1,244 Investment funds 136 — — — 136 $ 2,173 $ 393 $ 142 $ (16 ) $ 2,692 Liabilities: Commodity derivatives $ (13 ) $ (283 ) $ (46 ) $ 119 $ (223 ) Interest rate derivatives — (13 ) (1 ) — (14 ) $ (13 ) $ (296 ) $ (47 ) $ 119 $ (237 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $103 million as of September 30, 2016 and December 31, 2015 , 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. Refer to Note 10 for further discussion regarding the Company's risk management and hedging activities. 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 and are primarily accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The fair value of the Company's investments in auction rate securities, where there is no current liquid market, is determined using pricing models based on available observable market data and the Company's judgment about the assumptions, including liquidity and nonperformance risks, which market participants would use when pricing the asset. 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 Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2016: Beginning balance $ 44 $ 14 $ 18 $ 47 $ 4 $ 44 Changes included in earnings 9 49 — 8 103 — Changes in fair value recognized in OCI (2 ) — — (2 ) — 6 Changes in fair value recognized in net regulatory assets (1 ) — — (12 ) — — Purchases 1 — — 1 — — Redemptions — — — — — (32 ) Settlements 5 (52 ) — 14 (96 ) — Ending balance $ 56 $ 11 $ 18 $ 56 $ 11 $ 18 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2015: Beginning balance $ 34 $ 5 $ 45 $ 51 $ — $ 45 Changes included in earnings 6 25 — 17 70 — Changes in fair value recognized in OCI (2 ) — (1 ) (5 ) — (1 ) Changes in fair value recognized in net regulatory assets (4 ) — — (21 ) — — Purchases — — — 1 — — Settlements 9 (23 ) — — (66 ) — Transfers from Level 2 — — — — 3 — Ending balance $ 43 $ 7 $ 44 $ 43 $ 7 $ 44 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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,203 $ 42,970 $ 37,972 $ 41,785
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 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 September 30, 2016 Assets: Commodity derivatives $ — $ 11 $ — $ (6 ) $ 5 Money market mutual funds (2) 199 — — — 199 Investment funds 16 — — — 16 $ 215 $ 11 $ — $ (6 ) $ 220 Liabilities - Commodity derivatives $ — $ (116 ) $ — $ 79 $ (37 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 9 $ 3 $ (3 ) $ 9 Money market mutual funds (2) 13 — — — 13 Investment funds 15 — — — 15 $ 28 $ 9 $ 3 $ (3 ) $ 37 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 78 $ (70 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $73 million and $75 million as of September 30, 2016 and December 31, 2015 , 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 6 for further discussion regarding PacifiCorp's risk management and hedging activities. PacifiCorp's investments in money market mutual funds and investment funds are stated at fair value and are primarily accounted for as available-for-sale securities. When available, PacifiCorp uses a readily observable quoted market price or net asset value of an identical security in an active market 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. 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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,063 $ 8,690 $ 7,114 $ 8,210
MidAmerican Energy 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 MidAmerican Energy's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. MidAmerican Energy has various financial assets and liabilities that are measured at fair value on the Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that MidAmerican Energy has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect MidAmerican Energy's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. MidAmerican Energy develops these inputs based on the best information available, including its own data. The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions): Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of September 30, 2016: Assets: Commodity derivatives $ — $ 3 $ 2 $ (3 ) $ 2 Money market mutual funds (2) 51 — — — 51 Debt securities: United States government obligations 156 — — — 156 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Auction rate securities — — 18 — 18 Equity securities: United States companies 249 — — — 249 International companies 6 — — — 6 Investment funds 9 — — — 9 $ 471 $ 46 $ 20 $ (3 ) $ 534 Liabilities - commodity derivatives $ (1 ) $ (4 ) $ (4 ) $ 4 $ (5 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2015: Assets: Commodity derivatives $ — $ 8 $ 18 $ (13 ) $ 13 Money market mutual funds (2) 56 — — — 56 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 26 — 26 Equity securities: United States companies 239 — — — 239 International companies 6 — — — 6 Investment funds 4 — — — 4 $ 438 $ 53 $ 44 $ (13 ) $ 522 Liabilities - commodity derivatives $ (13 ) $ (61 ) $ (24 ) $ 41 $ (57 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $1 million and $28 million as of September 30, 2016 and December 31, 2015 , 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. Refer to Note 9 for further discussion regarding MidAmerican Energy's risk management and hedging activities. MidAmerican Energy's investments in money market mutual funds and debt and equity securities are stated at fair value and are primarily accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The fair value of MidAmerican Energy's investments in auction rate securities, where there is no current liquid market, is determined using pricing models based on available observable market data and MidAmerican Energy's judgment about the assumptions, including liquidity and nonperformance risks, which market participants would use when pricing the asset. The following table reconciles the beginning and ending balances of MidAmerican Energy's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Commodity Derivatives Auction Rate Securities Commodity Derivatives Auction Rate Securities 2016: Beginning balance $ (2 ) $ 18 $ (6 ) $ 26 Transfer to affiliate — — (4 ) — Changes in fair value recognized in OCI — — — 3 Changes in fair value recognized in net regulatory assets (1 ) — (5 ) — Redemptions — — — (11 ) Settlements 1 — 13 — Ending balance $ (2 ) $ 18 $ (2 ) $ 18 2015: Beginning balance $ (7 ) $ 27 $ 12 $ 26 Changes included in earnings 2 — 6 — Changes in fair value recognized in OCI (2 ) (1 ) (5 ) — Changes in fair value recognized in net regulatory assets (5 ) — (20 ) — Purchases — — 1 — Settlements 5 — (1 ) — Ending balance $ (7 ) $ 26 $ (7 ) $ 26 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 September 30, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,268 $ 5,000 $ 4,271 $ 4,636
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 10 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 September 30, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,593 $ 5,458 $ 4,597 $ 5,051
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 September 30, 2016 Assets - investment funds $ 6 $ — $ — $ 6 Liabilities - commodity derivatives $ — $ — $ (19 ) $ (19 ) As of December 31, 2015 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 ) 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. Interest rate swaps are valued using a financial model which utilizes observable inputs for similar instruments based primarily on market price curves. 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 September 30, 2016 and December 31, 2015 , 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. Refer to Note 6 for further discussion regarding Nevada Power's risk management and hedging activities. Nevada Power's investment funds are accounted for as trading securities and are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. The following table reconciles the beginning and ending balances of Nevada Power's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ (22 ) $ (33 ) $ (22 ) $ (30 ) Changes in fair value recognized in regulatory assets (1 ) 2 (6 ) (3 ) Settlements 4 6 9 8 Ending balance $ (19 ) $ (25 ) $ (19 ) $ (25 ) 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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,580 $ 3,176 $ 2,788 $ 3,240
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, investments held in Rabbi trusts, 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, principally related to derivative contracts, 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. 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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,246 $ 1,165 $ 1,248

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies 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. USA Power In October 2005, prior to BHE's ownership of PacifiCorp, PacifiCorp was added as a defendant to a lawsuit originally filed in February 2005 in the Third District Court of Salt Lake County, Utah ("Third District Court") by USA Power, LLC, USA Power Partners, LLC and Spring Canyon Energy, LLC (collectively, the "Plaintiff"). The Plaintiff's complaint alleged that PacifiCorp misappropriated confidential proprietary information in violation of Utah's Uniform Trade Secrets Act and accused PacifiCorp of breach of contract and related claims in regard to the Plaintiff's 2002 and 2003 proposals to build a natural gas-fueled generating facility in Juab County, Utah. In October 2007, the Third District Court granted PacifiCorp's motion for summary judgment on all counts and dismissed the Plaintiff's claims in their entirety. In a May 2010 ruling on the Plaintiff's petition for reconsideration, the Utah Supreme Court reversed summary judgment and remanded the case back to the Third District Court for further consideration. In May 2012, a jury awarded damages to the Plaintiff for breach of contract and misappropriation of a trade secret in the amounts of $18 million for actual damages and $113 million for unjust enrichment. After considering various motions filed by the parties to expand or limit damages, interest and attorney's fees, in May 2013, the court entered a final judgment against PacifiCorp in the amount of $115 million , which includes the $113 million of aggregate damages previously awarded and amounts awarded for the Plaintiff's attorneys' fees. The final judgment also ordered that postjudgment interest accrue beginning as of the date of the April 2013 initial judgment. In May 2013, PacifiCorp posted a surety bond issued by a subsidiary of Berkshire Hathaway to secure its estimated obligation. Both PacifiCorp and the Plaintiff filed appeals with the Utah Supreme Court. The Utah Supreme Court affirmed the district court's decision and denied the issues appealed by all parties. In May 2016, PacifiCorp paid $123 million for the final judgment and postjudgment interest. 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 the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would have begun no earlier than 2020. Under the KHSA, PacifiCorp and its customers were protected from uncapped dam removal costs and liabilities. For dam removal to occur, federal legislation consistent with the KHSA was required to provide, among other things, protection for PacifiCorp from all liabilities associated with dam removal activities. As of December 31, 2015, no federal legislation had been enacted, and several parties to the KHSA initiated a dispute resolution process. In February 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 agreement in principle committing to explore potential amendment of the KHSA to facilitate removal of the Klamath dams through a FERC process without the need for federal legislation. Since that time, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce have negotiated an amendment to the KHSA that was signed on April 6, 2016. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC") 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 facilities, but the 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. Under the amended KHSA, 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 will be 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 in order for facilities 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. PacifiCorp 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. USA Power In October 2005, prior to BHE's ownership of PacifiCorp, PacifiCorp was added as a defendant to a lawsuit originally filed in February 2005 in the Third District Court of Salt Lake County, Utah ("Third District Court") by USA Power, LLC, USA Power Partners, LLC and Spring Canyon Energy, LLC (collectively, the "Plaintiff"). The Plaintiff's complaint alleged that PacifiCorp misappropriated confidential proprietary information in violation of Utah's Uniform Trade Secrets Act and accused PacifiCorp of breach of contract and related claims in regard to the Plaintiff's 2002 and 2003 proposals to build a natural gas-fueled generating facility in Juab County, Utah. In October 2007, the Third District Court granted PacifiCorp's motion for summary judgment on all counts and dismissed the Plaintiff's claims in their entirety. In a May 2010 ruling on the Plaintiff's petition for reconsideration, the Utah Supreme Court reversed summary judgment and remanded the case back to the Third District Court for further consideration. In May 2012, a jury awarded damages to the Plaintiff for breach of contract and misappropriation of a trade secret in the amounts of $18 million for actual damages and $113 million for unjust enrichment. After considering various motions filed by the parties to expand or limit damages, interest and attorney's fees, in May 2013, the court entered a final judgment against PacifiCorp in the amount of $115 million , which includes the $113 million of aggregate damages previously awarded and amounts awarded for the Plaintiff's attorneys' fees. The final judgment also ordered that postjudgment interest accrue beginning as of the date of the April 2013 initial judgment. In May 2013, PacifiCorp posted a surety bond issued by a subsidiary of Berkshire Hathaway to secure its estimated obligation. Both PacifiCorp and the Plaintiff filed appeals with the Utah Supreme Court. The Utah Supreme Court affirmed the district court's decision and denied the issues appealed by all parties. In May 2016, PacifiCorp paid $123 million for the final judgment and postjudgment interest. Sanpete County, Utah Rangeland Fire In June 2012, a major rangeland fire occurred in Sanpete County, Utah. Certain parties allege that contact between two of PacifiCorp's transmission lines may have triggered a ground fault that led to the fire. PacifiCorp has engaged experts to review the cause and origin of the fire, as well as to assess the damages. PacifiCorp has accrued its best estimate of the potential loss and expected insurance recovery. PacifiCorp believes it is reasonably possible it may incur additional loss beyond the amount accrued, but does not believe the potential additional loss 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 the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would have begun no earlier than 2020. Under the KHSA, PacifiCorp and its customers were protected from uncapped dam removal costs and liabilities. For dam removal to occur, federal legislation consistent with the KHSA was required to provide, among other things, protection for PacifiCorp from all liabilities associated with dam removal activities. As of December 31, 2015, no federal legislation had been enacted, and several parties to the KHSA initiated a dispute resolution process. In February 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 agreement in principle committing to explore potential amendment of the KHSA to facilitate removal of the Klamath dams through a FERC process without the need for federal legislation. Since that time, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce have negotiated an amendment to the KHSA that was signed on April 6, 2016. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC")" 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 facilities, but the 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. Under the amended KHSA, 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 will be 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 in order for facilities 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 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. The FERC is expected to rule on the second complaint by the second quarter of 2017, 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 has accrued an $11 million liability for refunds under both complaints of amounts collected under the higher ROE from November 2013 through September 30, 2016.
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 11 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. Senate Bill 123 In June 2013, the Nevada State Legislature passed Senate Bill No. 123 ("SB 123"), which included the retirement of coal plants and replacing the capacity with renewable and other generating facilities. In May 2014, Nevada Power filed its Emissions Reduction Capacity Replacement Plan ("ERCR Plan") in compliance with SB 123. In July 2015, Nevada Power filed an amendment to its ERCR Plan with the PUCN which was approved in September 2015. In June 2015, the Nevada State Legislature passed Assembly Bill No. 498, which modified the capacity replacement components of SB 123. Consistent with direction provided by the PUCN, Nevada Power acquired a 272 -megawatt ("MW") natural gas co-generating facility in 2014, acquired a 210 -MW natural gas peaking facility in 2014, constructed a 15 -MW solar photovoltaic facility in 2015 and contracted two renewable power purchase agreements with 100 -MW solar photovoltaic generating facilities in 2015. In February 2016, Nevada Power solicited proposals to acquire 35 MW of nameplate renewable energy capacity to be owned by Nevada Power. Nevada Power did not enter into any agreements to acquire the 35 MW of nameplate renewable energy capacity; however, it has the option to acquire the 35 MW in the future under the ERCR Plan, subject to PUCN approval. In addition, Nevada Power was granted approval to purchase the remaining 143 MW of the Silverhawk natural gas-fueled combined cycle generating facility. In June 2016 Nevada Power executed a long-term power purchase agreement for 100 MW of nameplate renewable energy capacity in Nevada, which is pending PUCN approval. These transactions are related to Nevada Power's final steps to comply with SB 123, resulting in the retirement of 812 MW of coal-fueled generation by 2019. Legal Matters Nevada Power is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Nevada Power does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Nevada Power is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts and are described below. Switch, Ltd. In July 2016, Switch, Ltd. filed a complaint in the United States District Court for the District of Nevada against various parties, including Nevada Power. In September 2016, Switch filed an amended complaint. The amended complaint alleges that actions by the former general counsel of the PUCN, as well as the PUCN and the PUCN Staff, violated state and federal laws and as a result of those actions Switch was prevented from being able to utilize an alternative energy provider. Switch also alleges that Nevada Power was aware of the wrong doing and either participated in the activities or failed to take action to stop the wrong doing, and as a result Nevada Power has been improperly enriched by these activities. In addition, Switch asserted antitrust claims against Nevada Power. Switch is seeking monetary damages and to invalidate the settlement agreement between Switch and Nevada Power relating to Switch utilizing an alternative energy provider. Nevada Power intends to vigorously defend against these claims. Nevada Power cannot assess or predict the outcome of the case at this time.
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.

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss, Net	9 Months Ended
	Sep. 30, 2016
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): Unrealized Unrecognized Foreign Gains on Unrealized AOCI Amounts on Currency Available- (Losses) Gains Attributable Retirement Translation For-Sale on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2014 $ (490 ) $ (412 ) $ 390 $ 18 $ (494 ) Other comprehensive income (loss) 10 (479 ) 179 (13 ) (303 ) Balance, September 30, 2015 $ (480 ) $ (891 ) $ 569 $ 5 $ (797 ) Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 80 (339 ) 151 (2 ) (110 ) Balance, September 30, 2016 $ (358 ) $ (1,431 ) $ 766 $ 5 $ (1,018 ) Reclassifications from AOCI to net income for the periods ended September 30, 2016 and 2015 were insignificant. For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 10 . Additionally, refer to the "Foreign Operations" discussion in Note 8 for information about unrecognized amounts on retirement benefits reclassifications from AOCI that do not impact net income in their entirety.
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Accumulated Other Comprehensive Income (Loss), Net The following table shows the change in accumulated other comprehensive income (loss), net ("AOCI") by each component of other comprehensive income, net of applicable income taxes (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2014 $ (3 ) $ (20 ) $ (23 ) Other comprehensive loss — (7 ) (7 ) Balance at September 30, 2015 $ (3 ) $ (27 ) $ (30 ) Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 2 — 2 Dividend (Note 3) — 27 27 Balance, September 30, 2016 $ (1 ) $ — $ (1 ) For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 9 .
MidAmerican Funding, LLC and Subsidiaries [Domain]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Accumulated Other Comprehensive Income (Loss), Net Refer to Note 12 of MidAmerican Energy's Notes to Financial Statements.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
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. Effective January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to MidAmerican Energy Services, LLC, a subsidiary of BHE . Prior period amounts have been changed to reflect this activity in BHE and Other . Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: PacifiCorp $ 1,434 $ 1,423 $ 3,919 $ 3,942 MidAmerican Funding 797 681 2,008 1,984 NV Energy 987 1,124 2,309 2,665 Northern Powergrid 220 265 748 852 BHE Pipeline Group 201 196 704 736 BHE Transmission (1) 169 153 309 428 BHE Renewables 273 269 582 583 HomeServices 820 745 2,152 1,951 BHE and Other (2) 191 213 523 597 Total operating revenue $ 5,092 $ 5,069 $ 13,254 $ 13,738 Depreciation and amortization: PacifiCorp $ 193 $ 194 $ 589 $ 584 MidAmerican Funding 118 101 338 300 NV Energy 106 103 315 307 Northern Powergrid 49 50 149 148 BHE Pipeline Group 53 51 160 151 BHE Transmission 61 56 177 147 BHE Renewables 57 55 169 160 HomeServices 9 8 24 20 BHE and Other (2) 2 (1 ) 1 (3 ) Total depreciation and amortization $ 648 $ 617 $ 1,922 $ 1,814 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating income: PacifiCorp $ 445 $ 437 $ 1,108 $ 1,037 MidAmerican Funding 284 209 524 422 NV Energy 394 398 656 697 Northern Powergrid 90 129 373 452 BHE Pipeline Group 68 66 320 322 BHE Transmission (1) 81 62 35 166 BHE Renewables 157 153 233 225 HomeServices 87 78 179 161 BHE and Other (2) (21 ) 4 (36 ) (9 ) Total operating income 1,585 1,536 3,392 3,473 Interest expense (460 ) (475 ) (1,401 ) (1,423 ) Capitalized interest (1) 14 18 128 69 Allowance for equity funds (1) 17 23 147 84 Interest and dividend income 39 27 93 79 Other, net 15 (9 ) 26 27 Total income before income tax expense and equity income $ 1,210 $ 1,120 $ 2,385 $ 2,309 Interest expense: PacifiCorp $ 95 $ 97 $ 286 $ 287 MidAmerican Funding 55 50 164 150 NV Energy 60 67 190 195 Northern Powergrid 33 37 105 108 BHE Pipeline Group 13 16 39 51 BHE Transmission 40 37 114 110 BHE Renewables 51 49 148 144 HomeServices 1 1 2 3 BHE and Other (2) 112 121 353 375 Total interest expense $ 460 $ 475 $ 1,401 $ 1,423 Operating revenue by country: United States $ 4,697 $ 4,643 $ 12,185 $ 12,444 United Kingdom 220 265 748 852 Canada (1) 170 154 313 434 Philippines and other 5 7 8 8 Total operating revenue by country $ 5,092 $ 5,069 $ 13,254 $ 13,738 Income before income tax expense and equity income by country: United States $ 1,089 $ 962 $ 1,945 $ 1,785 United Kingdom 74 98 284 364 Canada 43 41 114 119 Philippines and other 4 19 42 41 Total income before income tax expense and equity income by country $ 1,210 $ 1,120 $ 2,385 $ 2,309 As of September 30, December 31, 2016 2015 Total assets: PacifiCorp $ 23,557 $ 23,550 MidAmerican Funding 17,199 16,315 NV Energy 14,424 14,656 Northern Powergrid 6,727 7,317 BHE Pipeline Group 5,115 4,953 BHE Transmission 8,493 7,553 BHE Renewables 6,775 5,892 HomeServices 1,947 1,705 BHE and Other (2) 1,651 1,677 Total assets $ 85,888 $ 83,618 (1) Refer to Note 4 for information regarding certain regulatory matters impacting AltaLink's financial results for the three- and nine-month periods ended September 30, 2016 . (2) 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 nine-month period ended September 30, 2016 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2015 $ 1,129 $ 2,102 $ 2,369 $ 1,056 $ 101 $ 1,428 $ 95 $ 794 $ 2 $ 9,076 Acquisitions — — — — — 4 — 41 1 46 Foreign currency translation — — — (92 ) — 77 — — (3 ) (18 ) Other — — — — (19 ) — — — — (19 ) September 30, 2016 $ 1,129 $ 2,102 $ 2,369 $ 964 $ 82 $ 1,509 $ 95 $ 835 $ — $ 9,085
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 previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information presented below. Refer to Note 3 for further discussion. 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 remaining nonregulated operations. The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 692 $ 585 $ 1,572 $ 1,472 Regulated gas 102 94 430 499 Other 1 1 2 3 Total operating revenue $ 795 $ 680 $ 2,004 $ 1,974 Depreciation and amortization: Regulated electric $ 107 $ 91 $ 306 $ 270 Regulated gas 11 10 32 30 Total depreciation and amortization $ 118 $ 101 $ 338 $ 300 Operating income: Regulated electric $ 289 $ 215 $ 481 $ 376 Regulated gas (5 ) (6 ) 42 45 Other — (1 ) — (1 ) Total operating income $ 284 $ 208 $ 523 $ 420 As of September 30, December 31, Total assets: Regulated electric $ 13,842 $ 12,970 Regulated gas 1,240 1,251 Other (1) 1 164 Total assets $ 15,083 $ 14,385 (1) Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information presented below. Refer to Note 3 for further discussion. 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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 692 $ 585 $ 1,572 $ 1,472 Regulated gas 102 94 430 499 Other 3 2 6 13 Total operating revenue $ 797 $ 681 $ 2,008 $ 1,984 Depreciation and amortization: Regulated electric $ 107 $ 91 $ 306 $ 270 Regulated gas 11 10 32 30 Total depreciation and amortization $ 118 $ 101 $ 338 $ 300 Operating income: Regulated electric $ 289 $ 215 $ 481 $ 376 Regulated gas (5 ) (6 ) 42 45 Other — — 1 1 Total operating income $ 284 $ 209 $ 524 $ 422 As of September 30, December 31, Total assets (1) : Regulated electric $ 15,033 $ 14,161 Regulated gas 1,319 1,330 Other 20 183 Total assets $ 16,372 $ 15,674 (1) Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units. Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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. Sierra Pacific believes presenting gross margin allows the reader to assess the impact of Sierra Pacific's regulatory treatment and its overall regulatory environment on a consistent basis and is meaningful. Gross margin is calculated as operating revenue less cost of fuel, energy and capacity and natural gas purchased for resale ("cost of sales"). The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 207 $ 228 $ 539 $ 625 Regulated gas 15 18 81 94 Total operating revenue $ 222 $ 246 $ 620 $ 719 Cost of sales: Regulated electric $ 73 $ 96 $ 208 $ 294 Regulated gas 5 7 42 57 Total cost of sales $ 78 $ 103 $ 250 $ 351 Gross margin: Regulated electric $ 134 $ 132 $ 331 $ 331 Regulated gas 10 11 39 37 Total gross margin $ 144 $ 143 $ 370 $ 368 Operating and maintenance: Regulated electric $ 36 $ 37 $ 112 $ 106 Regulated gas 4 5 14 13 Total operating and maintenance $ 40 $ 42 $ 126 $ 119 Depreciation and amortization: Regulated electric $ 26 $ 24 $ 76 $ 72 Regulated gas 4 4 12 12 Total depreciation and amortization $ 30 $ 28 $ 88 $ 84 Operating income: Regulated electric $ 68 $ 65 $ 127 $ 136 Regulated gas 1 1 11 10 Total operating income $ 69 $ 66 $ 138 $ 146 Interest expense: Regulated electric $ 11 $ 14 $ 38 $ 42 Regulated gas 1 2 4 4 Total interest expense $ 12 $ 16 $ 42 $ 46 As of September 30, December 31, 2016 2015 Total assets: Regulated electric $ 3,087 $ 3,060 Regulated gas 312 316 Regulated common assets (1) 73 111 Total assets $ 3,472 $ 3,487 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2016
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Disclosure	Discontinued Operations Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. The transfer of MidAmerican Energy's unregulated retail services business to a subsidiary of BHE repaid a portion of MHC's note payable to BHE.
MidAmerican Energy Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Disclosure	Discontinued Operations On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE. The transfer was made at MidAmerican Energy’s carrying value of the assets and liabilities as of December 31, 2015, and was recorded by MidAmerican Energy as a noncash dividend as summarized in the table below. Financial results of the unregulated retail services business for the three- and nine-month periods ended September 30, 2015 , have been reclassified to discontinued operations in the Statements of Operations. Operating revenue and cost of sales of the unregulated retail services business for the three-month period ended September 30, 2015 , totaled $240 million and $232 million , respectively. Operating revenue and cost of sales of the unregulated retail services business for the nine-month period ended September 30, 2015 , totaled $685 million and $648 million , respectively. Cash flows from operating activities of the unregulated retail services business totaled $13 million for the nine-month period ended September 30, 2015 , and are reflected in the Statement of Cash Flows. Assets, liabilities and equity of the unregulated retail services business reflected in the Balance Sheet as of December 31, 2015, are as follows (in millions): Receivables $ 115 Derivative assets 41 Deferred income taxes 21 Accounts payable (49 ) Derivative liabilities (42 ) Other assets and liabilities, net 4 Dividend, excluding accumulated other comprehensive loss, net 90 Accumulated other comprehensive loss, net 27 Dividend, including accumulated other comprehensive loss, net $ 117

Related Party Transactions Rela

Related Party Transactions Related Party Transactions (Notes)	9 Months Ended
	Sep. 30, 2016
PacifiCorp [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions Berkshire Hathaway includes BHE and its subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income taxes are remitted to or received from BHE. For the nine-month period ended September 30, 2016 , PacifiCorp made net cash payments for federal and state income taxes to BHE totaling $61 million . For the nine-month period ended September 30, 2015 , PacifiCorp received net cash payments for federal and state income taxes from BHE totaling $35 million .

Property, Plant and Equipment52

Property, Plant and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2016
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 September 30, December 31, Life 2016 2015 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 70,316 $ 69,248 Interstate natural gas pipeline assets 3-80 years 6,866 6,755 77,182 76,003 Accumulated depreciation and amortization (23,305 ) (22,682 ) Regulated assets, net 53,877 53,321 Nonregulated assets: Independent power plants 5-30 years 5,073 4,751 Other assets 3-30 years 983 875 6,056 5,626 Accumulated depreciation and amortization (1,000 ) (805 ) Nonregulated assets, net 5,056 4,821 Net operating assets 58,933 58,142 Construction work-in-progress 3,175 2,627 Property, plant and equipment, net $ 62,108 $ 60,769
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 September 30, December 31, Depreciable Life 2016 2015 Utility plant in service, net: Generation 20-70 years $ 10,601 $ 10,404 Transmission 52-70 years 1,479 1,305 Electric distribution 20-70 years 3,138 3,059 Gas distribution 28-70 years 1,542 1,507 Utility plant in service 16,760 16,275 Accumulated depreciation and amortization (5,357 ) (5,229 ) Utility plant in service, net 11,403 11,046 Nonregulated property, net: Nonregulated property gross 5-45 years 7 15 Accumulated depreciation and amortization (1 ) (5 ) Nonregulated property, net 6 10 11,409 11,056 Construction work in progress 1,044 667 Property, plant and equipment, net $ 12,453 $ 11,723
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 September 30, December 31, Depreciable Life 2016 2015 Property, plant and equipment in-service 5-75 years $ 27,051 $ 26,757 Accumulated depreciation and amortization (8,658 ) (8,360 ) Net property, plant and equipment in-service 18,393 18,397 Construction work-in-progress 654 629 Total property, plant and equipment, net $ 19,047 $ 19,026
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 September 30, December 31, 2016 2015 Utility plant: Generation 30 - 55 years $ 4,222 $ 4,212 Distribution 20 - 65 years 3,208 3,118 Transmission 45 - 65 years 1,838 1,788 General and intangible plant 5 - 65 years 738 694 Utility plant 10,006 9,812 Accumulated depreciation and amortization (3,144 ) (2,971 ) Utility plant, net 6,862 6,841 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 2 2 Plant, net 6,864 6,843 Construction work-in-progress 107 153 Property, plant and equipment, net $ 6,971 $ 6,996
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 September 30, December 31, 2016 2015 Utility plant: Electric generation 30 - 60 years $ 1,137 $ 1,134 Electric distribution 20 - 70 years 1,411 1,382 Electric transmission 50 - 70 years 757 739 Electric general and intangible plant 5 - 65 years 164 139 Natural gas distribution 40 - 70 years 378 374 Natural gas general and intangible plant 8 - 10 years 15 13 Common general 5 - 65 years 267 265 Utility plant 4,129 4,046 Accumulated depreciation and amortization (1,419 ) (1,368 ) Utility plant, net 2,710 2,678 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 6 — Plant, net 2,716 2,678 Construction work-in-progress 85 88 Property, plant and equipment, net $ 2,801 $ 2,766

Investments and Restricted Ca53

Investments and Restricted Cash and Investments (Tables)	9 Months Ended
	Sep. 30, 2016
Investments and Restricted Cash and Investments [Abstract]
Investments and Restricted Cash and Investments	Investments and restricted cash and investments consists of the following (in millions): As of September 30, December 31, 2016 2015 Investments: BYD Company Limited common stock $ 1,477 $ 1,238 Rabbi trusts 398 380 Other 162 130 Total investments 2,037 1,748 Equity method investments: Electric Transmission Texas, LLC 647 585 BHE Renewables tax equity investments 635 168 Bridger Coal Company 168 190 Other 157 160 Total equity method investments 1,607 1,103 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 454 429 Solar Star and Topaz Projects 116 95 Other 161 129 Total restricted cash and investments 731 653 Total investments and restricted cash and investments $ 4,375 $ 3,504 Reflected as: Current assets $ 228 $ 137 Noncurrent assets 4,147 3,367 Total investments and restricted cash and investments $ 4,375 $ 3,504

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (16 ) (9 ) (15 ) (11 ) State income tax, net of federal income tax benefit — — — 1 Income tax effect of foreign income (3 ) (1 ) (4 ) (4 ) Equity income 1 1 1 1 Other, net (1 ) (2 ) — (1 ) Effective income tax rate 16 % 24 % 17 % 21 %
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
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 from continuing operations is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (58 ) (62 ) (58 ) (65 ) State income tax, net of federal income tax benefit (6 ) (10 ) (4 ) (7 ) Effects of ratemaking (1 ) (2 ) (3 ) (7 ) Other, net — — — — Effective income tax rate (30 )% (39 )% (30 )% (44 )%
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
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 from continuing operations is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (60 ) (64 ) (61 ) (66 ) State income tax, net of federal income tax benefit (7 ) (11 ) (4 ) (7 ) Effects of ratemaking — (2 ) (3 ) (7 ) Other, net — 1 — — Effective income tax rate (32 )% (41 )% (33 )% (45 )%

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2016
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Service cost $ 5 $ 6 $ 16 $ 18 Interest cost 17 20 55 60 Expected return on plan assets (27 ) (29 ) (85 ) (87 ) Net amortization 11 17 34 49 Net periodic benefit cost $ 6 $ 14 $ 20 $ 40 Domestic Operations Net periodic benefit cost for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 7 $ 8 $ 22 $ 24 Interest cost 31 30 94 91 Expected return on plan assets (39 ) (42 ) (120 ) (127 ) Net amortization 12 13 36 41 Net periodic benefit cost $ 11 $ 9 $ 32 $ 29 Other postretirement: Service cost $ 2 $ 2 $ 7 $ 8 Interest cost 7 6 23 22 Expected return on plan assets (10 ) (10 ) (31 ) (33 ) Net amortization (2 ) (1 ) (9 ) (7 ) Net periodic benefit credit $ (3 ) $ (3 ) $ (10 ) $ (10 )
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 1 $ 1 $ 3 $ 3 Interest cost 14 13 41 40 Expected return on plan assets (18 ) (19 ) (56 ) (58 ) Net amortization 8 10 25 31 Net periodic benefit cost $ 5 $ 5 $ 13 $ 16 Other postretirement: Service cost $ 1 $ — $ 2 $ 2 Interest cost 3 4 11 12 Expected return on plan assets (5 ) (5 ) (16 ) (17 ) Net amortization (1 ) (1 ) (4 ) (3 ) Net periodic benefit credit $ (2 ) $ (2 ) $ (7 ) $ (6 )
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit cost (credit) for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Pension: Service cost $ 3 $ 3 $ 8 $ 9 Interest cost 8 8 25 24 Expected return on plan assets (11 ) (11 ) (33 ) (34 ) Net amortization — — 1 1 Net periodic benefit cost $ — $ — $ 1 $ — Other postretirement: Service cost $ 1 $ 2 $ 4 $ 5 Interest cost 2 1 7 6 Expected return on plan assets (3 ) (4 ) (10 ) (11 ) Net amortization (1 ) — (3 ) (2 ) Net periodic benefit credit $ (1 ) $ (1 ) $ (2 ) $ (2 )
Nevada 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 September 30, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (7 ) $ (38 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (5 ) (5 )
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 September 30, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (4 ) $ (29 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (8 ) (9 ) Other Postretirement Plans - Other long-term liabilities (32 ) (32 )

Risk Management and Hedging A56

Risk Management and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2016
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 the Company'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 September 30, 2016 Not designated as hedging contracts: Commodity assets (1) $ 15 $ 81 $ 11 $ 2 $ 109 Commodity liabilities (1) (3 ) — (66 ) (164 ) (233 ) Interest rate assets 12 — — — 12 Interest rate liabilities — — (6 ) (14 ) (20 ) Total 24 81 (61 ) (176 ) (132 ) Designated as hedging contracts: Commodity assets — — 1 1 2 Commodity liabilities — — (21 ) (16 ) (37 ) Interest rate assets — — — — — Interest rate liabilities — — (4 ) (7 ) (11 ) Total — — (24 ) (22 ) (46 ) Total derivatives 24 81 (85 ) (198 ) (178 ) Cash collateral receivable — — 20 65 85 Total derivatives - net basis $ 24 $ 81 $ (65 ) $ (133 ) $ (93 ) Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2015 Not designated as hedging contracts: Commodity assets (1) $ 25 $ 72 $ 7 $ 2 $ 106 Commodity liabilities (1) (4 ) — (113 ) (175 ) (292 ) Interest rate assets 7 — — — 7 Interest rate liabilities — — (3 ) (6 ) (9 ) Total 28 72 (109 ) (179 ) (188 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (33 ) (17 ) (50 ) Interest rate assets — 3 — — 3 Interest rate liabilities — — (4 ) (1 ) (5 ) Total — 3 (36 ) (16 ) (49 ) Total derivatives 28 75 (145 ) (195 ) (237 ) Cash collateral receivable — — 40 63 103 Total derivatives - net basis $ 28 $ 75 $ (105 ) $ (132 ) $ (134 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2016 and December 31, 2015 , a net regulatory asset of $195 million and $250 million , respectively, was recorded related to the net derivative liability of $124 million and $186 million , respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts	The following table reconciles the beginning and ending balances of the Company'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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 185 $ 233 $ 250 $ 223 Changes in fair value recognized in net regulatory assets 18 47 5 104 Net losses reclassified to operating revenue (3 ) (11 ) (6 ) (4 ) Net losses reclassified to cost of sales (5 ) (16 ) (54 ) (70 ) Ending balance $ 195 $ 253 $ 195 $ 253
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 26 $ 38 $ 46 $ 32 Changes in fair value recognized in OCI 15 20 35 37 Net gains reclassified to operating revenue 1 1 1 4 Net losses reclassified to cost of sales (7 ) (14 ) (47 ) (28 ) Ending balance $ 35 $ 45 $ 35 $ 45
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 2 10 Natural gas purchases Decatherms 321 317 Fuel purchases Gallons 3 11 Interest rate swaps US$ 730 653 Mortgage sale commitments, net US$ (375 ) (312 )
PacifiCorp [Member]
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 September 30, 2016 Not designated as hedging contracts (1) : Commodity assets $ 5 $ 2 $ 4 $ — $ 11 Commodity liabilities (2 ) — (27 ) (87 ) (116 ) Total 3 2 (23 ) (87 ) (105 ) Total derivatives 3 2 (23 ) (87 ) (105 ) Cash collateral receivable — — 14 59 73 Total derivatives - net basis $ 3 $ 2 $ (9 ) $ (28 ) $ (32 ) As of December 31, 2015 Not designated as hedging contracts (1) : Commodity assets $ 10 $ — $ 2 $ — $ 12 Commodity liabilities (1 ) — (58 ) (89 ) (148 ) Total 9 — (56 ) (89 ) (136 ) Total derivatives 9 — (56 ) (89 ) (136 ) Cash collateral receivable — — 18 57 75 Total derivatives - net basis $ 9 $ — $ (38 ) $ (32 ) $ (61 )
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 89 $ 99 $ 133 $ 85 Changes in fair value recognized in net regulatory assets 15 38 (4 ) 65 Net (losses) gains reclassified to operating revenue (2 ) 1 8 29 Net losses reclassified to energy costs — (10 ) (35 ) (51 ) Ending balance $ 102 $ 128 $ 102 $ 128
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 September 30, December 31, Measure 2016 2015 Electricity (sales) purchases Megawatt hours (6 ) 1 Natural gas purchases Decatherms 92 111 Fuel oil purchases Gallons 3 11
MidAmerican Energy Company [Member]
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 MidAmerican Energy's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Balance Sheets (in millions): Other Current Assets Other Assets Other Current Liabilities Other Long-term Liabilities Total As of September 30, 2016: Not designated as hedging contracts (1)(2) : Commodity assets $ 2 $ — $ 3 $ — $ 5 Commodity liabilities — — (7 ) (2 ) (9 ) Total 2 — (4 ) (2 ) (4 ) Designated as hedging contracts (2) : Commodity assets — — — — — Commodity liabilities — — — — — Total — — — — — Total derivatives 2 — (4 ) (2 ) (4 ) Cash collateral receivable — — 1 — 1 Total derivatives - net basis $ 2 $ — $ (3 ) $ (2 ) $ (3 ) Other Current Assets Other Assets Other Current Liabilities Other Long- Term Liabilities Total As of December 31, 2015: Not designated as hedging contracts (1) : Commodity assets $ 12 $ 4 $ 5 $ 2 $ 23 Commodity liabilities (3 ) — (36 ) (10 ) (49 ) Total 9 4 (31 ) (8 ) (26 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (32 ) (17 ) (49 ) Total — — (31 ) (15 ) (46 ) Total derivatives 9 4 (62 ) (23 ) (72 ) Cash collateral receivable — — 22 6 28 Total derivatives - net basis $ 9 $ 4 $ (40 ) $ (17 ) $ (44 ) (1) MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2016 and December 31, 2015 , a net regulatory asset of $5 million and $20 million , respectively, was recorded related to the net derivative liability of $4 million and $26 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 MidAmerican Energy'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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ 3 $ 28 $ 20 $ 38 Changes in fair value recognized in net regulatory assets 5 10 8 29 Net losses reclassified to operating revenue (1 ) (12 ) (14 ) (34 ) Net losses reclassified to cost of gas sold (2 ) (3 ) (9 ) (10 ) Ending balance $ 5 $ 23 $ 5 $ 23
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table reconciles the beginning and ending balances of MidAmerican Energy's accumulated other comprehensive loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ — $ 39 $ 45 $ 34 Transfer to affiliate — — (45 ) — Changes in fair value recognized in OCI — 21 — 40 Net gains reclassified to nonregulated cost of sales — (14 ) — (28 ) Ending balance $ — $ 46 $ — $ 46
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 September 30, December 31, Measure 2016 2015 Electricity purchases Megawatt hours — 15 Natural gas purchases Decatherms 17 17
Nevada Power Company [Member]
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power'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 Current Long-term Liabilities Liabilities Total As of September 30, 2016 Commodity liabilities (1) $ (9 ) $ (10 ) $ (19 ) As of December 31, 2015 Commodity liabilities (1) $ (8 ) $ (14 ) $ (22 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2016 and December 31, 2015 , a regulatory asset of $19 million and $22 million , respectively, was recorded related to the derivative liability of $19 million and $22 million , respectively.
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2016 2015 Electricity sales Megawatt hours (2 ) (2 ) Natural gas purchases Decatherms 143 126

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
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 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 September 30, 2016 Assets: Commodity derivatives $ 1 $ 22 $ 88 $ (18 ) $ 93 Interest rate derivatives — 1 11 — 12 Mortgage loans held for sale — 443 — — 443 Money market mutual funds (2) 557 — — — 557 Debt securities: United States government obligations 156 — — — 156 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Auction rate securities — — 18 — 18 Equity securities: United States companies 249 — — — 249 International companies 1,483 — — — 1,483 Investment funds 174 — — — 174 $ 2,620 $ 509 $ 117 $ (18 ) $ 3,228 Liabilities: Commodity derivatives $ (4 ) $ (234 ) $ (32 ) $ 103 $ (167 ) Interest rate derivatives (1 ) (30 ) — — (31 ) $ (5 ) $ (264 ) $ (32 ) $ 103 $ (198 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 16 $ 93 $ (16 ) $ 93 Interest rate derivatives — 5 5 — 10 Mortgage loans held for sale — 327 — — 327 Money market mutual funds (2) 421 — — — 421 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 44 — 44 Equity securities: United States companies 239 — — — 239 International companies 1,244 — — — 1,244 Investment funds 136 — — — 136 $ 2,173 $ 393 $ 142 $ (16 ) $ 2,692 Liabilities: Commodity derivatives $ (13 ) $ (283 ) $ (46 ) $ 119 $ (223 ) Interest rate derivatives — (13 ) (1 ) — (14 ) $ (13 ) $ (296 ) $ (47 ) $ 119 $ (237 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $103 million as of September 30, 2016 and December 31, 2015 , 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 Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2016: Beginning balance $ 44 $ 14 $ 18 $ 47 $ 4 $ 44 Changes included in earnings 9 49 — 8 103 — Changes in fair value recognized in OCI (2 ) — — (2 ) — 6 Changes in fair value recognized in net regulatory assets (1 ) — — (12 ) — — Purchases 1 — — 1 — — Redemptions — — — — — (32 ) Settlements 5 (52 ) — 14 (96 ) — Ending balance $ 56 $ 11 $ 18 $ 56 $ 11 $ 18 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2015: Beginning balance $ 34 $ 5 $ 45 $ 51 $ — $ 45 Changes included in earnings 6 25 — 17 70 — Changes in fair value recognized in OCI (2 ) — (1 ) (5 ) — (1 ) Changes in fair value recognized in net regulatory assets (4 ) — — (21 ) — — Purchases — — — 1 — — Settlements 9 (23 ) — — (66 ) — Transfers from Level 2 — — — — 3 — Ending balance $ 43 $ 7 $ 44 $ 43 $ 7 $ 44
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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,203 $ 42,970 $ 37,972 $ 41,785
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 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 September 30, 2016 Assets: Commodity derivatives $ — $ 11 $ — $ (6 ) $ 5 Money market mutual funds (2) 199 — — — 199 Investment funds 16 — — — 16 $ 215 $ 11 $ — $ (6 ) $ 220 Liabilities - Commodity derivatives $ — $ (116 ) $ — $ 79 $ (37 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 9 $ 3 $ (3 ) $ 9 Money market mutual funds (2) 13 — — — 13 Investment funds 15 — — — 15 $ 28 $ 9 $ 3 $ (3 ) $ 37 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 78 $ (70 )
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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,063 $ 8,690 $ 7,114 $ 8,210
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 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 September 30, 2016: Assets: Commodity derivatives $ — $ 3 $ 2 $ (3 ) $ 2 Money market mutual funds (2) 51 — — — 51 Debt securities: United States government obligations 156 — — — 156 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Auction rate securities — — 18 — 18 Equity securities: United States companies 249 — — — 249 International companies 6 — — — 6 Investment funds 9 — — — 9 $ 471 $ 46 $ 20 $ (3 ) $ 534 Liabilities - commodity derivatives $ (1 ) $ (4 ) $ (4 ) $ 4 $ (5 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2015: Assets: Commodity derivatives $ — $ 8 $ 18 $ (13 ) $ 13 Money market mutual funds (2) 56 — — — 56 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 26 — 26 Equity securities: United States companies 239 — — — 239 International companies 6 — — — 6 Investment funds 4 — — — 4 $ 438 $ 53 $ 44 $ (13 ) $ 522 Liabilities - commodity derivatives $ (13 ) $ (61 ) $ (24 ) $ 41 $ (57 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $1 million and $28 million as of September 30, 2016 and December 31, 2015 , 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 assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Commodity Derivatives Auction Rate Securities Commodity Derivatives Auction Rate Securities 2016: Beginning balance $ (2 ) $ 18 $ (6 ) $ 26 Transfer to affiliate — — (4 ) — Changes in fair value recognized in OCI — — — 3 Changes in fair value recognized in net regulatory assets (1 ) — (5 ) — Redemptions — — — (11 ) Settlements 1 — 13 — Ending balance $ (2 ) $ 18 $ (2 ) $ 18 2015: Beginning balance $ (7 ) $ 27 $ 12 $ 26 Changes included in earnings 2 — 6 — Changes in fair value recognized in OCI (2 ) (1 ) (5 ) — Changes in fair value recognized in net regulatory assets (5 ) — (20 ) — Purchases — — 1 — Settlements 5 — (1 ) — Ending balance $ (7 ) $ 26 $ (7 ) $ 26
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 September 30, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,268 $ 5,000 $ 4,271 $ 4,636
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 September 30, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,593 $ 5,458 $ 4,597 $ 5,051
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 September 30, 2016 Assets - investment funds $ 6 $ — $ — $ 6 Liabilities - commodity derivatives $ — $ — $ (19 ) $ (19 ) As of December 31, 2015 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 )
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Beginning balance $ (22 ) $ (33 ) $ (22 ) $ (30 ) Changes in fair value recognized in regulatory assets (1 ) 2 (6 ) (3 ) Settlements 4 6 9 8 Ending balance $ (19 ) $ (25 ) $ (19 ) $ (25 )
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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,580 $ 3,176 $ 2,788 $ 3,240
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 September 30, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,246 $ 1,165 $ 1,248

Components of Accumulated Oth58

Components of Accumulated Other Comprehensive Loss, Net (Tables)	9 Months Ended
	Sep. 30, 2016
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): Unrealized Unrecognized Foreign Gains on Unrealized AOCI Amounts on Currency Available- (Losses) Gains Attributable Retirement Translation For-Sale on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2014 $ (490 ) $ (412 ) $ 390 $ 18 $ (494 ) Other comprehensive income (loss) 10 (479 ) 179 (13 ) (303 ) Balance, September 30, 2015 $ (480 ) $ (891 ) $ 569 $ 5 $ (797 ) Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 80 (339 ) 151 (2 ) (110 ) Balance, September 30, 2016 $ (358 ) $ (1,431 ) $ 766 $ 5 $ (1,018 )
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss, Net	The following table shows the change in accumulated other comprehensive income (loss), net ("AOCI") by each component of other comprehensive income, net of applicable income taxes (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2014 $ (3 ) $ (20 ) $ (23 ) Other comprehensive loss — (7 ) (7 ) Balance at September 30, 2015 $ (3 ) $ (27 ) $ (30 ) Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 2 — 2 Dividend (Note 3) — 27 27 Balance, September 30, 2016 $ (1 ) $ — $ (1 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
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. Effective January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to MidAmerican Energy Services, LLC, a subsidiary of BHE . Prior period amounts have been changed to reflect this activity in BHE and Other . Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: PacifiCorp $ 1,434 $ 1,423 $ 3,919 $ 3,942 MidAmerican Funding 797 681 2,008 1,984 NV Energy 987 1,124 2,309 2,665 Northern Powergrid 220 265 748 852 BHE Pipeline Group 201 196 704 736 BHE Transmission (1) 169 153 309 428 BHE Renewables 273 269 582 583 HomeServices 820 745 2,152 1,951 BHE and Other (2) 191 213 523 597 Total operating revenue $ 5,092 $ 5,069 $ 13,254 $ 13,738 Depreciation and amortization: PacifiCorp $ 193 $ 194 $ 589 $ 584 MidAmerican Funding 118 101 338 300 NV Energy 106 103 315 307 Northern Powergrid 49 50 149 148 BHE Pipeline Group 53 51 160 151 BHE Transmission 61 56 177 147 BHE Renewables 57 55 169 160 HomeServices 9 8 24 20 BHE and Other (2) 2 (1 ) 1 (3 ) Total depreciation and amortization $ 648 $ 617 $ 1,922 $ 1,814 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating income: PacifiCorp $ 445 $ 437 $ 1,108 $ 1,037 MidAmerican Funding 284 209 524 422 NV Energy 394 398 656 697 Northern Powergrid 90 129 373 452 BHE Pipeline Group 68 66 320 322 BHE Transmission (1) 81 62 35 166 BHE Renewables 157 153 233 225 HomeServices 87 78 179 161 BHE and Other (2) (21 ) 4 (36 ) (9 ) Total operating income 1,585 1,536 3,392 3,473 Interest expense (460 ) (475 ) (1,401 ) (1,423 ) Capitalized interest (1) 14 18 128 69 Allowance for equity funds (1) 17 23 147 84 Interest and dividend income 39 27 93 79 Other, net 15 (9 ) 26 27 Total income before income tax expense and equity income $ 1,210 $ 1,120 $ 2,385 $ 2,309 Interest expense: PacifiCorp $ 95 $ 97 $ 286 $ 287 MidAmerican Funding 55 50 164 150 NV Energy 60 67 190 195 Northern Powergrid 33 37 105 108 BHE Pipeline Group 13 16 39 51 BHE Transmission 40 37 114 110 BHE Renewables 51 49 148 144 HomeServices 1 1 2 3 BHE and Other (2) 112 121 353 375 Total interest expense $ 460 $ 475 $ 1,401 $ 1,423 Operating revenue by country: United States $ 4,697 $ 4,643 $ 12,185 $ 12,444 United Kingdom 220 265 748 852 Canada (1) 170 154 313 434 Philippines and other 5 7 8 8 Total operating revenue by country $ 5,092 $ 5,069 $ 13,254 $ 13,738 Income before income tax expense and equity income by country: United States $ 1,089 $ 962 $ 1,945 $ 1,785 United Kingdom 74 98 284 364 Canada 43 41 114 119 Philippines and other 4 19 42 41 Total income before income tax expense and equity income by country $ 1,210 $ 1,120 $ 2,385 $ 2,309 As of September 30, December 31, 2016 2015 Total assets: PacifiCorp $ 23,557 $ 23,550 MidAmerican Funding 17,199 16,315 NV Energy 14,424 14,656 Northern Powergrid 6,727 7,317 BHE Pipeline Group 5,115 4,953 BHE Transmission 8,493 7,553 BHE Renewables 6,775 5,892 HomeServices 1,947 1,705 BHE and Other (2) 1,651 1,677 Total assets $ 85,888 $ 83,618 (1) Refer to Note 4 for information regarding certain regulatory matters impacting AltaLink's financial results for the three- and nine-month periods ended September 30, 2016 . (2) 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.
Schedule of Goodwill	The following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2016 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2015 $ 1,129 $ 2,102 $ 2,369 $ 1,056 $ 101 $ 1,428 $ 95 $ 794 $ 2 $ 9,076 Acquisitions — — — — — 4 — 41 1 46 Foreign currency translation — — — (92 ) — 77 — — (3 ) (18 ) Other — — — — (19 ) — — — — (19 ) September 30, 2016 $ 1,129 $ 2,102 $ 2,369 $ 964 $ 82 $ 1,509 $ 95 $ 835 $ — $ 9,085
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 692 $ 585 $ 1,572 $ 1,472 Regulated gas 102 94 430 499 Other 1 1 2 3 Total operating revenue $ 795 $ 680 $ 2,004 $ 1,974 Depreciation and amortization: Regulated electric $ 107 $ 91 $ 306 $ 270 Regulated gas 11 10 32 30 Total depreciation and amortization $ 118 $ 101 $ 338 $ 300 Operating income: Regulated electric $ 289 $ 215 $ 481 $ 376 Regulated gas (5 ) (6 ) 42 45 Other — (1 ) — (1 ) Total operating income $ 284 $ 208 $ 523 $ 420 As of September 30, December 31, Total assets: Regulated electric $ 13,842 $ 12,970 Regulated gas 1,240 1,251 Other (1) 1 164 Total assets $ 15,083 $ 14,385 (1) Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 692 $ 585 $ 1,572 $ 1,472 Regulated gas 102 94 430 499 Other 3 2 6 13 Total operating revenue $ 797 $ 681 $ 2,008 $ 1,984 Depreciation and amortization: Regulated electric $ 107 $ 91 $ 306 $ 270 Regulated gas 11 10 32 30 Total depreciation and amortization $ 118 $ 101 $ 338 $ 300 Operating income: Regulated electric $ 289 $ 215 $ 481 $ 376 Regulated gas (5 ) (6 ) 42 45 Other — — 1 1 Total operating income $ 284 $ 209 $ 524 $ 422 As of September 30, December 31, Total assets (1) : Regulated electric $ 15,033 $ 14,161 Regulated gas 1,319 1,330 Other 20 183 Total assets $ 16,372 $ 15,674 (1) Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units. Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 Nine-Month Periods Ended September 30, Ended September 30, 2016 2015 2016 2015 Operating revenue: Regulated electric $ 207 $ 228 $ 539 $ 625 Regulated gas 15 18 81 94 Total operating revenue $ 222 $ 246 $ 620 $ 719 Cost of sales: Regulated electric $ 73 $ 96 $ 208 $ 294 Regulated gas 5 7 42 57 Total cost of sales $ 78 $ 103 $ 250 $ 351 Gross margin: Regulated electric $ 134 $ 132 $ 331 $ 331 Regulated gas 10 11 39 37 Total gross margin $ 144 $ 143 $ 370 $ 368 Operating and maintenance: Regulated electric $ 36 $ 37 $ 112 $ 106 Regulated gas 4 5 14 13 Total operating and maintenance $ 40 $ 42 $ 126 $ 119 Depreciation and amortization: Regulated electric $ 26 $ 24 $ 76 $ 72 Regulated gas 4 4 12 12 Total depreciation and amortization $ 30 $ 28 $ 88 $ 84 Operating income: Regulated electric $ 68 $ 65 $ 127 $ 136 Regulated gas 1 1 11 10 Total operating income $ 69 $ 66 $ 138 $ 146 Interest expense: Regulated electric $ 11 $ 14 $ 38 $ 42 Regulated gas 1 2 4 4 Total interest expense $ 12 $ 16 $ 42 $ 46 As of September 30, December 31, 2016 2015 Total assets: Regulated electric $ 3,087 $ 3,060 Regulated gas 312 316 Regulated common assets (1) 73 111 Total assets $ 3,472 $ 3,487 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2016
MidAmerican Energy Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations [Table Text Block]	Assets, liabilities and equity of the unregulated retail services business reflected in the Balance Sheet as of December 31, 2015, are as follows (in millions): Receivables $ 115 Derivative assets 41 Deferred income taxes 21 Accounts payable (49 ) Derivative liabilities (42 ) Other assets and liabilities, net 4 Dividend, excluding accumulated other comprehensive loss, net 90 Accumulated other comprehensive loss, net 27 Dividend, including accumulated other comprehensive loss, net $ 117

General (Details)

General (Details)	9 Months Ended
	Sep. 30, 2016OperatingSegmentsOwnedAndOperatedCompanies
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

Property, Plant and Equipment62

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 58,933	$ 58,142
Construction work-in-progress	3,175	2,627
Property, plant and equipment, net	62,108	60,769
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	77,182	76,003
Accumulated depreciation and amortization	(23,305)	(22,682)
Property, plant and equipment in service, net	53,877	53,321
Construction work-in-progress	2,600	2,300
Regulated assets [Member] | Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 70,316	69,248
Regulated assets [Member] | Utility generation, transmission and distribution systems | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Regulated assets [Member] | Utility generation, transmission and distribution systems | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Regulated assets [Member] | Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,866	6,755
Regulated assets [Member] | Interstate natural gas pipeline assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Regulated assets [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	$ 6,056	5,626
Accumulated depreciation and amortization	(1,000)	(805)
Property, plant and equipment in service, net	5,056	4,821
Unregulated operation [Member] | Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,073	4,751
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	$ 983	$ 875
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 Equipment63

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 27,051	$ 26,757
Public utility accumulated depreciation and amortization	(8,658)	(8,360)
Public Utilities Property, Plant And Equipment In Service, Net	18,393	18,397
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	654	629
Public Utilities, Property, Plant and Equipment, Net	$ 19,047	$ 19,026
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	75 years

Property, Plant and Equipment64

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 11,409	$ 11,056
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,044	667
Public Utilities, Property, Plant and Equipment, Net	12,453	11,723
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	16,760	16,275
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,357)	(5,229)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	11,403	11,046
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(5)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	10
Gross public utility property, plant and equipment in service	7	15
Electric Operations [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	10,601	10,404
Public Utilities, Property, Plant and Equipment, Transmission	1,479	1,305
Public Utilities, Property, Plant and Equipment, Distribution	3,138	3,059
Natural Gas Processing Plant [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,542	$ 1,507

Property, Plant and Equipment65

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 22	$ 22
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (9)	$ (8)

Property, Plant and Equipment66

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC(Details) - Nevada Power Company [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,864	$ 6,843
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	107	153
Public Utilities, Property, Plant and Equipment, Net	6,971	6,996
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	4,222	4,212
Public Utilities, Property, Plant and Equipment, Distribution	3,208	3,118
Public Utilities, Property, Plant and Equipment, Transmission	1,838	1,788
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	738	694
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	10,006	9,812
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,144	2,971
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6,862	6,841
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2	$ 2
Minimum [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	45 years	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Minimum [Member] | Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Maximum [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	55 years	55 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	65 years	65 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	65 years	65 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years
Maximum [Member] | Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years

Property, Plant and Equipment67

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,716	$ 2,678
Public Utilities, Property, Plant and Equipment, Net	2,801	2,766
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	85	88
Public Utilities, Property, Plant and Equipment, Net	2,801	2,766
Regulated Operation [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,137	1,134
Public Utilities, Property, Plant and Equipment, Distribution	1,411	1,382
Public Utilities, Property, Plant and Equipment, Transmission	757	739
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	164	139
Regulated Operation [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	378	374
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	15	13
Regulated Operation [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	267	265
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,129	4,046
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,419	1,368
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,710	$ 2,678
Regulated Operation [Member] | Minimum [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated Operation [Member] | Minimum [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	40 years	40 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	8 years	8 years
Regulated Operation [Member] | Minimum [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years	5 years
Regulated Operation [Member] | Maximum [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years
Regulated Operation [Member] | Maximum [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	10 years	10 years
Regulated Operation [Member] | Maximum [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	65 years	65 years
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6	$ 0
Unregulated operation [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 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	65 years	65 years

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters (Details) - Alberta Utilities Commission [Member] - AltaLink [Member] CAD in Millions, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended
	Jul. 31, 2016CAD	Nov. 30, 2014CAD	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	CAD 415			$ 200
Amount for discontinuance of CWIP in rate base [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	82
Amount previously collected as CWIP given as refund [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	277			200
Amount previously collected as CWIP given as returns [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	12
Amount for change to flow through method for income taxes [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	68		$ 11	$ 36
2015-2016 GTA [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, approved rate increase (decrease) per month	61
Public Utilities, requested rate increase (decrease) per month	12
2015-2016 GTA [Member] | GTA 2015 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		CAD 811
Public Utilities, Approved Rate Increase (Decrease), Amount	599
2015-2016 GTA [Member] | GTA 2016 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		CAD 1,000
Public Utilities, Approved Rate Increase (Decrease), Amount	CAD 685

Regulatory Matters Regulatory69

Regulatory Matters Regulatory Matters - NPC (Details) - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities	$ 2,788	$ 2,631
Accounts Payable, Current	1,475	1,564
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities	411	304
Accounts Payable, Current	208	$ 214
Nevada Chapter 704B, Impact Fees [Member] | Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Deferred Revenue, Additions	97
Regulatory liabilities	92
Accounts Payable, Current	$ 5

Investments and Restricted Ca70

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments [Abstract]
Investments	$ 2,037	$ 1,748
Equity Method Investments [Abstract]
Equity method investments	1,607	1,103
Restricted Cash and Investments [Abstract]
Restricted cash and investments	731	653
Investments, including equity method investments and restricted cash and investments	4,375	3,504
Investments, including equity method investments and restricted cash and investments, current	228	137
Investments, including equity method investments and restricted cash and investments, noncurrent	4,147	3,367
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	454	429
Solar Star and Topaz Projects [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	116	95
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	161	129
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	647	585
Tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	635	168
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	168	190
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	157	160
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	1,477	1,238
Available-for-sale securities, gross unrealized gain (loss)	1,200	1,000
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	398	380
Other investments [Member]
Investments [Abstract]
Other investments	$ 162	$ 130

Recent Financing Transactions R

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) CAD in Millions, $ in Millions	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	May 31, 2016USD ($)	May 31, 2016CAD	Apr. 30, 2016USD ($)
BHE [Member] | BHE Junior Subordinated Debentures Due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 1,000
BHE [Member] | BHE Junior Subordinated Debentures, due 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 500
Marshall Wind Energy, LLC [Member] | Term Loan, Due June 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 95
Percent of interest rate swaps that fix the underlying interest rate on outstanding debt		100.00%
AltaLink, L.P. [Member] | AltaLink, L.P. Series 2016-1 Medium-Term Notes 2.747% due May 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount | CAD				CAD 350
Debt instrument, interest rate, stated percentage			2.747%	2.747%
Sierra Pacific Power Company [Member] | Tax-exempt bond obligations, variable rate series, due 2029 to 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 205
Debt Instrument, Repurchased Face Amount			125
Sierra Pacific Power Company [Member] | Tax-exempt bond obligations, fixed-rate series, due 2029 to 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			139
Debt Instrument, Repurchased Face Amount			349
Sierra Pacific Power Company [Member] | General and Refunding Mortgage Bonds, Series V [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring, Debtor, Subsequent Periods, Contingent Payments, Amount			$ 344
Sierra Pacific Power Company [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 400
Debt instrument, interest rate, stated percentage					2.60%
Sierra Pacific Power Company [Member] | Mortgage securities, 6.000%, Series M due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 450
Debt instrument, interest rate, stated percentage					6.00%
Debt Instrument, Repurchased Face Amount					$ 450
Minimum [Member] | Sierra Pacific Power Company [Member] | Tax-exempt bond obligations, fixed-rate series, due 2029 to 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.25%	1.25%
Maximum [Member] | Sierra Pacific Power Company [Member] | Tax-exempt bond obligations, fixed-rate series, due 2029 to 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.00%	3.00%

Recent Financing Transactions72

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) $ in Millions	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)
BHE [Member] | Unsecured credit facility, $1.4 billion, expiring June 2017 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		$ 1,400
BHE [Member] | Unsecured credit facility, $600 million, expiring June 2017 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
BHE [Member] | Unsecured credit facility, $2 billion, expiring June 2019 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,000
PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2017 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity		600
PacifiCorp [Member] | Unsecured credit facility, $400 million, expiring June 2019 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Solar Star Funding, LLC [Member] | Letter of credit and reimbursement facility, Solar Star [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced			$ 320
Line of Credit Facility, Maximum Borrowing Capacity			$ 301
Letters of Credit Outstanding, Amount	$ 284
Maximum [Member] | BHE [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.70
Maximum [Member] | PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65

Recent Financing Transactions73

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 01, 2016USD ($)
Variable Rate Tax Exempt Obligation Series Due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 33
Variable Rate Tax Exempt Obligation Series Due 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	29
Variable Rate Tax Exempt Obligation Series Due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 4

Recent Financing Transactions74

Recent Financing Transactions Recent Financing Transactions - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	May 31, 2016	Apr. 30, 2016
Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 30
Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	25
Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	25
Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 59
Debt instrument, interest rate, stated percentage	1.50%
Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 60
Debt instrument, interest rate, stated percentage	3.00%
Water Facilities Refunding Revenue Bonds, Series 2016F, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 75
Water Facilities Refunding Revenue Bonds, Series 2016F, due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	20
Pollution Control Refunding Revenue Bonds, 1.250%, Series A, due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 20
Debt instrument, interest rate, stated percentage	1.25%
Pollution Control Refunding Revenue Bonds, Series B, due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 30
General and Refunding Mortgage Bonds, Series V-1 [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring, Debtor, Subsequent Periods, Contingent Payments, Amount	80
General and Refunding Mortgage Bonds, Series V-2 [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring, Debtor, Subsequent Periods, Contingent Payments, Amount	214
General and Refunding Mortgage Bonds, Series V-3 [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring, Debtor, Subsequent Periods, Contingent Payments, Amount	50
Water Facilities Refunding Revenue Bonds Series, 2007A, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 40
Water Facilities Refunding Revenue Bonds, Series 2007B, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		40
Gas Facilities Refunding Revenue Bonds, Series 2006A, due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		59
Gas and Water Facilities Refunding Revenue Bonds, Series 2006C, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 85
Pollution Control Revenue Bonds, Variable-Rate, Series 2006B due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		75
Pollution Control Refunding Revenue Bonds, Series 2006, due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		50
Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400
Debt instrument, interest rate, stated percentage		2.60%
Mortgage securities, 6.000%, Series M due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 450
Debt Instrument, Repurchased Face Amount		$ 450
Debt instrument, interest rate, stated percentage		6.00%

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(16.00%)	(9.00%)	(15.00%)	(11.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	0.00%	1.00%
Income tax effect of foreign income	(3.00%)	(1.00%)	(4.00%)	(4.00%)
Equity income	1.00%	1.00%	1.00%	1.00%
Other, net	(1.00%)	(2.00%)	(0.00%)	(1.00%)
Effective income tax rate	16.00%	24.00%	17.00%	21.00%
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			$ 860	$ 1,800
UNITED KINGDOM
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 16
Corporate Income Tax Rate, Effective April 1, 2020 [Member] | UNITED KINGDOM
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%
Corporate Income Tax Rate, Effective April 1, 2020 further reduction [Member] | UNITED KINGDOM
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%

Income Taxes - MEC (Details)

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(16.00%)	(9.00%)	(15.00%)	(11.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	0.00%	1.00%
Other, net	(1.00%)	(2.00%)	(0.00%)	(1.00%)
Effective income tax rate	16.00%	24.00%	17.00%	21.00%
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			$ 860	$ 1,800
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(58.00%)	(62.00%)	(58.00%)	(65.00%)
State income tax, net of federal income tax benefit	(6.00%)	(10.00%)	(4.00%)	(7.00%)
Effects of ratemaking	1.00%	2.00%	3.00%	7.00%
Other, net	(0.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	(30.00%)	(39.00%)	(30.00%)	(44.00%)
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			$ 416	$ 513

Income Taxes - MidAmerican Fund

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(16.00%)	(9.00%)	(15.00%)	(11.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	0.00%	1.00%
Other, net	(1.00%)	(2.00%)	(0.00%)	(1.00%)
Effective income tax rate	16.00%	24.00%	17.00%	21.00%
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			$ 860	$ 1,800
MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(60.00%)	(64.00%)	(61.00%)	(66.00%)
State income tax, net of federal income tax benefit	(7.00%)	(11.00%)	(4.00%)	(7.00%)
Effects of ratemaking	0.00%	2.00%	3.00%	7.00%
Other, net	(0.00%)	1.00%	(0.00%)	(0.00%)
Effective income tax rate	(32.00%)	(41.00%)	(33.00%)	(45.00%)
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			$ 422	$ 515

Employee Benefit Plans (Details

Employee Benefit Plans (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2016GBP (£)	Sep. 30, 2015USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 73
Service cost	$ 7	$ 8	22		$ 24
Interest cost	31	30	94		91
Expected return on plan assets	(39)	(42)	(120)		(127)
Net amortization	12	13	36		41
Net periodic benefit cost	11	9	32		29
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			1
Service cost	2	2	7		8
Interest cost	7	6	23		22
Expected return on plan assets	(10)	(10)	(31)		(33)
Net amortization	(2)	(1)	(9)		(7)
Net periodic benefit cost	(3)	(3)	(10)		(10)
UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			44	£ 31
Service cost	5	6	16		18
Interest cost	17	20	55		60
Expected return on plan assets	(27)	(29)	(85)		(87)
Net amortization	11	17	34		49
Net periodic benefit cost	$ 6	$ 14	$ 20		$ 40

Employee Benefit Plans - Employ

Employee Benefit Plans - Employer Contributions (Details) - 9 months ended Sep. 30, 2016 £ in Millions, $ in Millions	USD ($)	GBP (£)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 77
Employer contributions	73
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	1
UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year | £		£ 41
Employer contributions	$ 44	£ 31

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 8	$ 22	$ 24
Interest cost	31	30	94	91
Expected return on plan assets	(39)	(42)	(120)	(127)
Net amortization	12	13	36	41
Net periodic benefit cost	11	9	32	29
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	7	8
Interest cost	7	6	23	22
Expected return on plan assets	(10)	(10)	(31)	(33)
Net amortization	(2)	(1)	(9)	(7)
Net periodic benefit cost	(3)	(3)	(10)	(10)
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	3	3
Interest cost	14	13	41	40
Expected return on plan assets	(18)	(19)	(56)	(58)
Net amortization	8	10	25	31
Net periodic benefit cost	5	5	13	16
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	2	2
Interest cost	3	4	11	12
Expected return on plan assets	(5)	(5)	(16)	(17)
Net amortization	(1)	(1)	(4)	(3)
Net periodic benefit cost	$ (2)	$ (2)	$ (7)	$ (6)

Employee Benefit Plans Employ81

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 77
Employer contributions	73
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	1
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	4
Employer contributions	3
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	0
Employer contributions	$ 0

Employee Benefit Plans - MEC (D

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 8	$ 22	$ 24
Interest cost	31	30	94	91
Expected return on plan assets	(39)	(42)	(120)	(127)
Net amortization	12	13	36	41
Net periodic benefit cost	11	9	32	29
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	7	8
Interest cost	7	6	23	22
Expected return on plan assets	(10)	(10)	(31)	(33)
Net amortization	(2)	(1)	(9)	(7)
Net periodic benefit cost	(3)	(3)	(10)	(10)
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	8	9
Interest cost	8	8	25	24
Expected return on plan assets	(11)	(11)	(33)	(34)
Net amortization	0	0	1	1
Net periodic benefit cost	0	0	1	0
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	4	5
Interest cost	2	1	7	6
Expected return on plan assets	(3)	(4)	(10)	(11)
Net amortization	(1)	0	(3)	(2)
Net periodic benefit cost	$ (1)	$ (1)	$ (2)	$ (2)

Employee Benefit Plans Employ83

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 77
Employer contributions	73
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	1
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	5
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	$ 1

Employee Benefit Plans - NPC -

Employee Benefit Plans - NPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 73
Nevada Power Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	36	$ 0
Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(7)		$ (38)
Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(9)		(9)
Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(5)		(5)
Nevada Power Company [Member] | Other Current Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 1		$ 1

Employee Benefit Plans - SPPC -

Employee Benefit Plans - SPPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 73
Sierra Pacific Power Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	27	$ 0
Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	4		$ 29
Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	8		9
Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	32		32
Sierra Pacific Power Company [Member] | Other Current Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 1		$ 1

Asset Retirement Obligation A86

Asset Retirement Obligation Asset Retirement Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
MidAmerican Energy Company [Member]
Asset Retirement Obligation Disclosure [Line Items]
Asset Retirement Obligation, Revision of Estimate	$ 69

Asset Retirement Obligation MEC

Asset Retirement Obligation MEC (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation, Revision of Estimate	$ 69

Risk Management and Hedging A88

Risk Management and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (178)		$ (237)
Cash collateral, net receivable, offset against derivative positions	85		103
Derivative assets (liabilities), at fair value, net	(93)		(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	24		28
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	24		28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	81		75
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	81		75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(85)		(145)
Cash collateral, net receivable, offset against derivative positions	20		40
Derivative assets (liabilities), at fair value, net	(65)		(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(198)		(195)
Cash collateral, net receivable, offset against derivative positions	65		63
Derivative assets (liabilities), at fair value, net	(133)		(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(132)		(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	24		28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	81		72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(61)		(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(176)		(179)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(46)		(49)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		0
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		3
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(24)		(36)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(22)		(16)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	109		106
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(233)		(292)
Derivative, fair value, net	(124)		(186)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	195	$ 185	250	$ 253	$ 233	$ 223
Commodity derivative [Member] | 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	15		25
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(3)		(4)
Commodity derivative [Member] | 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	81		72
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | 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	11		7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(66)		(113)
Commodity derivative [Member] | 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	2		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(164)		(175)
Commodity derivative [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	2		3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(37)		(50)
Commodity derivative [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | 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	1		1
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(21)		(33)
Commodity derivative [Member] | 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		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(16)		(17)
Interest Rate Contract [Member] | 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		7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(20)		(9)
Interest Rate Contract [Member] | 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	12		7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(6)		(3)
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(14)		(6)
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(11)		(5)
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | 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	0		3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(4)		(4)
Interest Rate Contract [Member] | 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	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	$ (7)		$ (1)

Risk Management and Hedging A89

Risk Management and Hedging Activities - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 185	$ 233	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	18	47	5	104
Net losses reclassified to operating revenue	(3)	(11)	(6)	(4)
Net losses reclassified to cost of sales	(5)	(16)	(54)	(70)
Ending balance	$ 195	$ 253	$ 195	$ 253

Risk Management and Hedging A90

Risk Management and Hedging Activities - Designated as Hedging Contracts (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Cash flow hedge ineffectiveness	insignificant	insignificant	insignificant	insignificant
Cash flow hedge loss to be reclassified within twelve months			$ 24
Commodity derivative [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	$ 26	$ 38	46	$ 32
Changes in fair value recognized in OCI	15	20	35	37
Net gains reclassified to operating revenue	1	1	1	4
Net losses reclassified to cost of sales	(7)	(14)	(47)	(28)
Ending balance	$ 35	$ 45	$ 35	$ 45

Risk Management and Hedging A91

Risk Management and Hedging Activities - Derivative Contract Volumes (Details) gal in Millions, MWh in Millions, Dth in Millions, $ in Millions	Sep. 30, 2016USD ($)MWhgalDth	Dec. 31, 2015USD ($)MWhgalDth
Electricity purchases (in megawatt hours) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	10
Natural gas purchases (in decatherms) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	321	317
Fuel purchases (in gallons) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	3	11
Interest rate swap [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (730)	$ (653)
Mortgage sale commitments, net [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (375)	$ (312)

Risk Management and Hedging A92

Risk Management and Hedging Activities - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 227	$ 288
Collateral already posted, aggregate fair value	73	75
Additional collateral, aggregate fair value	$ 139	$ 198

Risk Management and Hedging A93

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (178)		$ (237)
Cash collateral, net receivable, offset against derivative positions	85		103
Derivative assets (liabilities), at fair value, net	(93)		(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	24		28
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	24		28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	81		75
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	81		75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(85)		(145)
Cash collateral, net receivable, offset against derivative positions	20		40
Derivative assets (liabilities), at fair value, net	(65)		(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(198)		(195)
Cash collateral, net receivable, offset against derivative positions	65		63
Derivative assets (liabilities), at fair value, net	(133)		(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(132)		(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	24		28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	81		72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(61)		(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(176)		(179)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	109		106
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(233)		(292)
Derivative, fair value, net	(124)		(186)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	195	$ 185	250	$ 253	$ 233	$ 223
Commodity derivative [Member] | 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	15		25
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(3)		(4)
Commodity derivative [Member] | 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	81		72
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity derivative [Member] | 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	11		7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(66)		(113)
Commodity derivative [Member] | 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	2		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(164)		(175)
PacifiCorp [Member] | Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(105)		(136)
Cash collateral, net receivable, offset against derivative positions	73		75
Derivative assets (liabilities), at fair value, net	(32)		(61)
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	3		9
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	3		9
PacifiCorp [Member] | Commodity derivative [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	2		0
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	2		0
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(23)		(56)
Cash collateral, net receivable, offset against derivative positions	14		18
Derivative assets (liabilities), at fair value, net	(9)		(38)
PacifiCorp [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(87)		(89)
Cash collateral, net receivable, offset against derivative positions	59		57
Derivative assets (liabilities), at fair value, net	(28)		(32)
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	11		12
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(116)		(148)
Derivative, fair value, net	(105)		(136)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	102	$ 89	133	$ 128	$ 99	$ 85
PacifiCorp [Member] | Commodity derivative [Member] | 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	5		10
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(2)		(1)
Derivative, fair value, net	3		9
PacifiCorp [Member] | Commodity derivative [Member] | 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		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Derivative, fair value, net	2		0
PacifiCorp [Member] | Commodity derivative [Member] | 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	4		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(27)		(58)
Derivative, fair value, net	(23)		(56)
PacifiCorp [Member] | Commodity derivative [Member] | 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	0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(87)		(89)
Derivative, fair value, net	$ (87)		$ (89)

Risk Management and Hedging A94

Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 185	$ 233	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	18	47	5	104
Net losses reclassified to operating revenue	(3)	(11)	(6)	(4)
Ending balance	195	253	195	253
PacifiCorp [Member]
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	89	99	133	85
Changes in fair value recognized in net regulatory assets	15	38	(4)	65
Net losses reclassified to operating revenue	(2)	1	8	29
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	0	(10)	(35)	(51)
Ending balance	$ 102	$ 128	$ 102	$ 128

Risk Management and Hedging A95

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Sep. 30, 2016MWhgalDth	Dec. 31, 2015MWhgalDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	(2)	(10)
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	(321)	(317)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	(3)	(11)
PacifiCorp [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	(6)	(1)
PacifiCorp [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	(92)	(111)
PacifiCorp [Member] | Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	(3)	(11)

Risk Management and Hedging A96

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 227	$ 288
Collateral already posted, aggregate fair value	73	75
Additional collateral, aggregate fair value	139	198
PacifiCorp [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	109	142
Collateral already posted, aggregate fair value	73	75
Additional collateral, aggregate fair value	$ 28	$ 64

Risk Management and Hedging A97

Risk Management and Hedging Activities - MEC - Balance Sheet Location (Details) - USD ($) $ in Millions		Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		$ (178)		$ (237)
Cash collateral, net receivable, offset against derivative positions		85		103
Derivative assets (liabilities), at fair value, net		(93)		(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		24		28
Cash collateral, net receivable, offset against derivative positions		0		0
Derivative assets (liabilities), at fair value, net		24		28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		81		75
Cash collateral, net receivable, offset against derivative positions		0		0
Derivative assets (liabilities), at fair value, net		81		75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(85)		(145)
Cash collateral, net receivable, offset against derivative positions		20		40
Derivative assets (liabilities), at fair value, net		(65)		(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(198)		(195)
Cash collateral, net receivable, offset against derivative positions		65		63
Derivative assets (liabilities), at fair value, net		(133)		(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(132)		(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		24		28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		81		72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(61)		(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(176)		(179)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(46)		(49)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0		0
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0		3
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(24)		(36)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(22)		(16)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		109		106
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		233		292
Derivative, fair value, net		(124)		(186)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		195	$ 185	250	$ 253	$ 233	$ 223
Commodity derivative [Member] | 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		15		25
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		3		4
Commodity derivative [Member] | 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		81		72
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Commodity derivative [Member] | 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		11		7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		66		113
Commodity derivative [Member] | 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		2		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		164		175
Commodity derivative [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		2		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		37		50
Commodity derivative [Member] | 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		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Commodity derivative [Member] | 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		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Commodity derivative [Member] | 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		1		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		21		33
Commodity derivative [Member] | 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		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		16		17
MidAmerican Energy Company [Member] | Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(4)		(72)
Cash collateral, net receivable, offset against derivative positions		1		28
Derivative assets (liabilities), at fair value, net		(3)		(44)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		2		9
Cash collateral, net receivable, offset against derivative positions		0		0
Derivative assets (liabilities), at fair value, net		2		9
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0		4
Cash collateral, net receivable, offset against derivative positions		0		0
Derivative assets (liabilities), at fair value, net		0		4
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(4)		(62)
Cash collateral, net receivable, offset against derivative positions		1		22
Derivative assets (liabilities), at fair value, net		(3)		(40)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(2)		(23)
Cash collateral, net receivable, offset against derivative positions		0		6
Derivative assets (liabilities), at fair value, net		(2)		(17)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	[1]	5		23
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	9		49
Derivative, fair value, net	[1]	(4)		(26)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		5	$ 3	20	$ 23	$ 28	$ 38
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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	[1]	2		12
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	0		3
Derivative, fair value, net	[1]	2		9
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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	[1]	0		4
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	0		0
Derivative, fair value, net	[1]	0		4
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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	[1]	3		5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	7		36
Derivative, fair value, net	[1]	(4)		(31)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	2		10
Derivative, fair value, net	[1]	(2)		(8)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		0		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		49
Derivative, fair value, net		0		(46)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Derivative, fair value, net		0		0
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Derivative, fair value, net		0		0
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		0		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		32
Derivative, fair value, net		0		(31)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | 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		0		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		17
Derivative, fair value, net		$ 0		$ (15)
[1]	(1)MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2016 and December 31, 2015, a net regulatory asset of $5 million and $20 million, respectively, was recorded related to the net derivative liability of $4 million and $26 million, respectively.

Risk Management and Hedging A98

Risk Management and Hedging Activities - MEC - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 185	$ 233	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	18	47	5	104
Net losses reclassified to operating revenue	(3)	(11)	(6)	(4)
Ending balance	195	253	195	253
MidAmerican Energy Company [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	3	28	20	38
Changes in fair value recognized in net regulatory assets	5	10	8	29
Net losses reclassified to operating revenue	(1)	(12)	(14)	(34)
Net gains (losses) reclassified to cost of gas sold	(2)	(3)	(9)	(10)
Ending balance	$ 5	$ 23	$ 5	$ 23

Risk Management and Hedging A99

Risk Management and Hedging Activities - MEC - Designated as Hedging Contracts (Details) - Commodity derivative [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ (26)	$ (38)	$ (46)	$ (32)
Changes in fair value recognized in OCI	15	20	35	37
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	(35)	(45)	(35)	(45)
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	0	(39)	(45)	(34)
Cumulative Net Gain (Loss) From Cash Flow Hedges, Before Taxes Transferred to Affiliate	0	0	(45)	0
Changes in fair value recognized in OCI	0	21	0	40
Cash flow hedge net gains (losses) reclassified to cost of sales- nonregulated	0	(14)	0	(28)
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ 0	$ (46)	$ 0	$ (46)

Risk Management and Hedging 100

Risk Management and Hedging Activities - MEC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2016MWhDth	Dec. 31, 2015MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	10
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	321	317
MidAmerican Energy Company [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	0	15
MidAmerican Energy Company [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	17	17

Risk Management and Hedging 101

Risk Management and Hedging Activities - MEC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Collateral already posted, aggregate fair value	$ 73	$ 75
Derivative, net liability position, aggregate fair value	227	288
Additional collateral, aggregate fair value	139	198
MidAmerican Energy Company [Member]
Derivative [Line Items]
Collateral already posted, aggregate fair value	0	0
Derivative, net liability position, aggregate fair value	7	66
Additional collateral, aggregate fair value	$ 3	$ 55

Risk Management and Hedging 102

Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - Commodity derivative [Member] - USD ($) $ in Millions		Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 233		$ 292
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		195	$ 185	250	$ 253	$ 233	$ 223
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		66		113
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		164		175
Nevada Power Company [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	9		8
Nevada Power Company [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	10		14
Recurring [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		19		22
Recurring [Member] | Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		32		46
Recurring [Member] | Level 3 [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	19		22
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		$ 19		$ 22
[1]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2016 and December 31, 2015, a regulatory asset of $19 million and $22 million, respectively, was recorded related to the derivative liability of $19 million and $22 million, respectively.

Risk Management and Hedging 103

Risk Management and Hedging Activities - NPC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2016MWhDth	Dec. 31, 2015MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	10
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	321	317
Nevada Power Company [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	2
Nevada Power Company [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	143	126

Risk Management and Hedging 104

Risk Management and Hedging Activities - NPC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 227	$ 288
Nevada Power Company [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 3	$ 3

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	$ 85	$ 103
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	(18)	(16)
Assets, fair value disclosure	3,228	2,692
Derivative liability, fair value, gross asset and right to reclaim cash, offset	103	119
Derivative liabilities	(198)	(237)
Cash collateral, net receivable, offset against derivative positions	85	103
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,620	2,173
Derivative liabilities	(5)	(13)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	509	393
Derivative liabilities	(264)	(296)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	117	142
Derivative liabilities	(32)	(47)
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	443	327
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	443	327
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	557	421
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	557	421
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	156	133
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	156	133
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	3	2
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	3	2
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	36	39
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	36	39
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	2	1
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	2	1
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
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2	3
Agency, asset and mortgage-backed 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
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2	3
Agency, asset and mortgage-backed 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
Auction rate securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	18	44
Auction rate securities [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
Auction rate securities [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
Auction rate securities [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	18	44
United States companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	249	239
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	249	239
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	1,483	1,244
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	1,483	1,244
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	174	136
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	174	136
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	(18)	(16)
Derivative assets	93	93
Derivative liability, fair value, gross asset and right to reclaim cash, offset	103	119
Derivative liabilities	(167)	(223)
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	0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(4)	(13)
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	22	16
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(234)	(283)
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	88	93
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(32)	(46)
Interest Rate Contract [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	12	10
Derivative liabilities	(31)	(14)
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	(1)	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	1	5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(30)	(13)
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	11	5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	$ 0	$ (1)

Fair Value Measurements - Level

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 44	$ 34	$ 47	$ 51
Changes included in earnings	9	6	8	17
Changes in fair value recognized in other comprehensive income	(2)	(2)	(2)	(5)
Changes in fair value recognized in net regulatory assets	(1)	(4)	(12)	(21)
Purchases	(1)	0	1	1
Fair value, level 3, asset, sales	0		0
Settlements	5	9	14	0
Transfers from Level 2		0		0
Ending balance	56	43	56	43
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	14	5	4	0
Changes included in earnings	49	25	103	70
Changes in fair value recognized in other comprehensive income	0	0	0	0
Changes in fair value recognized in net regulatory assets	0	0	0	0
Purchases	0	0	0	0
Fair value, level 3, asset, sales	0		0
Settlements	(52)	0	(96)	(66)
Transfers from Level 2		0		3
Ending balance	11	7	11	7
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	18	45	44	45
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	(1)	6	(1)
Changes in fair value recognized in net regulatory assets	0	0	0	0
Purchases	0	0	0	0
Fair value, level 3, asset, sales	0		32
Settlements	0	(23)	0	0
Transfers from Level 2		0		0
Ending balance	$ 18	$ 44	$ 18	$ 44

Fair Value Measurements - Debt

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 42,970	$ 41,785

Fair Value Measurements - Pacif

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	$ 85	$ 103
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	(18)	(16)
Assets, fair value disclosure	(3,228)	(2,692)
Derivative liability, fair value, gross asset and right to reclaim cash, offset	103	119
Derivative Liability	(198)	(237)
Cash collateral, net receivable, offset against derivative positions	85	103
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	(2,620)	(2,173)
Derivative Liability	(5)	(13)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	(509)	(393)
Derivative Liability	(264)	(296)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	(117)	(142)
Derivative Liability	(32)	(47)
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	(18)	(16)
Derivative assets	93	93
Derivative liability, fair value, gross asset and right to reclaim cash, offset	103	119
Derivative Liability	(167)	(223)
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	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(4)	(13)
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	22	16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(234)	(283)
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	88	93
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(32)	(46)
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	557	421
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	557	421
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	174	136
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	174	136
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	(220)	(37)
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	(215)	(28)
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	(11)	(9)
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	(3)
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	73	75
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)	(3)
Derivative assets	5	9
Assets, fair value disclosure	(6)	(3)
Derivative liability, fair value, gross asset and right to reclaim cash, offset	79	78
Derivative Liability	(37)	(70)
Cash collateral, net receivable, offset against derivative positions	73	75
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	11	9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(116)	(148)
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	3
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	199	13
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	199	13
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	16	15
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	16	15
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 - Pa109

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,970	41,785
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	7,063	7,114
PacifiCorp [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 8,690	$ 8,210

Fair Value Measurements - MEC (

Fair Value Measurements - MEC (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		$ 85	$ 103
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		85	103
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		18	16
Assets, fair value disclosure		3,228	2,692
Derivative liability, fair value, gross asset and right to reclaim cash, offset		103	119
Recurring [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		557	421
Recurring [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		156	133
Recurring [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		3	2
Recurring [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36	39
Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
Recurring [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	3
Recurring [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		18	44
Recurring [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		249	239
Recurring [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,483	1,244
Recurring [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		174	136
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,620	2,173
Recurring [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		557	421
Recurring [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		156	133
Recurring [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
Recurring [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
Recurring [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
Recurring [Member] | Level 1 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 1 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [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		249	239
Recurring [Member] | Level 1 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,483	1,244
Recurring [Member] | Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		174	136
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		509	393
Recurring [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		0	0
Recurring [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
Recurring [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		3	2
Recurring [Member] | Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36	39
Recurring [Member] | Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
Recurring [Member] | Level 2 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	3
Recurring [Member] | Level 2 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [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
Recurring [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
Recurring [Member] | 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
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		117	142
Recurring [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		0	0
Recurring [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
Recurring [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
Recurring [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
Recurring [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
Recurring [Member] | Level 3 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		18	44
Recurring [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
Recurring [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
Recurring [Member] | 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] | 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		18	16
Derivative liability, fair value, gross asset and right to reclaim cash, offset		103	119
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	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4	13
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		22	16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		234	283
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		88	93
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		32	46
MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		1	28
Assets, fair value disclosure		534	522
MidAmerican Energy Company [Member] | Recurring [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	51	56
MidAmerican Energy Company [Member] | Recurring [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		156	133
MidAmerican Energy Company [Member] | Recurring [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		3	2
MidAmerican Energy Company [Member] | Recurring [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36	39
MidAmerican Energy Company [Member] | Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
MidAmerican Energy Company [Member] | Recurring [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	3
MidAmerican Energy Company [Member] | Recurring [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		18	26
MidAmerican Energy Company [Member] | Recurring [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		249	239
MidAmerican Energy Company [Member] | Recurring [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		6	6
MidAmerican Energy Company [Member] | Recurring [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		9	4
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		471	438
MidAmerican Energy Company [Member] | Recurring [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]	51	56
MidAmerican Energy Company [Member] | Recurring [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		156	133
MidAmerican Energy Company [Member] | Recurring [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] | Recurring [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] | Recurring [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] | Recurring [Member] | Level 1 [Member] | Agency, asset and mortgage-backed 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] | Recurring [Member] | Level 1 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [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		249	239
MidAmerican Energy Company [Member] | Recurring [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	6
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		9	4
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		46	53
MidAmerican Energy Company [Member] | Recurring [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] | Recurring [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] | Recurring [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		3	2
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36	39
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	3
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [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] | Recurring [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] | Recurring [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] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		20	44
MidAmerican Energy Company [Member] | Recurring [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] | Recurring [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] | Recurring [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] | Recurring [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] | Recurring [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] | Recurring [Member] | Level 3 [Member] | Agency, asset and mortgage-backed 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] | Recurring [Member] | Level 3 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		18	26
MidAmerican Energy Company [Member] | Recurring [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] | Recurring [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] | Recurring [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]
Cash collateral, net receivable, offset against derivative positions		1	28
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		2	13
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	3	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		5	57
Derivative liability, fair value, gross asset and right to reclaim cash, offset	[2]	4	41
MidAmerican Energy Company [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		1	13
MidAmerican Energy Company [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		3	8
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4	61
MidAmerican Energy Company [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		2	18
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 4	$ 24
[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 $1 million and $28 million as of September 30, 2016 and December 31, 2015, respectively.

Fair Value Measurements - MEC -

Fair Value Measurements - MEC - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (2)	$ (7)	$ (6)	$ 12
Fair value, level 3, transferred to affiliate	0		(4)
Changes included in earnings		2		6
Changes in fair value recognized in other comprehensive income	0	(2)	0	(5)
Changes in fair value recognized in net regulatory assets	(1)	(5)	(5)	(20)
Purchases		0		1
Fair value, level 3, asset, sales	0		0
Settlements	1	5	13	(1)
Ending balance	(2)	(7)	(2)	(7)
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	18	45	44	45
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	(1)	6	(1)
Changes in fair value recognized in net regulatory assets	0	0	0	0
Purchases	0	0	0	0
Fair value, level 3, asset, sales	0		(32)
Settlements	0	(23)	0	0
Ending balance	18	44	18	44
Auction rate securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	18	27	26	26
Fair value, level 3, transferred to affiliate	0		0
Changes included in earnings		0		0
Changes in fair value recognized in other comprehensive income	0	(1)	3	0
Changes in fair value recognized in net regulatory assets	0	0	0	0
Purchases		0		0
Fair value, level 3, asset, sales	0		(11)
Settlements	0	0	0	0
Ending balance	$ 18	$ 26	$ 18	$ 26

Fair Value Measurements - ME112

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,970	41,785
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,268	4,271
Long-term debt, fair value		$ 4,636
MidAmerican Energy Company [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,000

Fair Value Measurements - MidAm

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,970	41,785
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,593	4,597
Long-term debt, fair value		$ 5,051
MidAmerican Funding, LLC and Subsidiaries [Domain] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,458

Fair Value Measurements - NPC (

Fair Value Measurements - NPC (Details) - Recurring [Member] - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Nevada Power Company [Member] | Investment Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		$ 6	$ 5
Nevada Power Company [Member] | Investment Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		6	5
Nevada Power Company [Member] | Investment Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		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]
Investment Funds		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		4	13
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		234	283
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		32	46
Commodity derivative [Member] | Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		19	22
Commodity derivative [Member] | Nevada Power Company [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
Commodity derivative [Member] | Nevada Power Company [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
Commodity derivative [Member] | Nevada Power Company [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	[1]	$ 19	$ 22
[1]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2016 and December 31, 2015, a regulatory asset of $19 million and $22 million, respectively, was recorded related to the derivative liability of $19 million and $22 million, respectively.

Fair Value Measurements - NPC -

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (22)	$ (33)	$ (22)	$ (30)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	1	(2)	6	3
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(4)	(6)	(9)	(8)
Ending balance	$ (19)	$ (25)	$ (19)	$ (25)

Fair Value Measurements - NP116

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,580	2,788
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,970	41,785
Level 2 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 3,176	$ 3,240

Fair Value Measurements - SPPC

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,203	$ 37,972
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,120	1,165
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,970	41,785
Level 2 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,246	$ 1,248

Commitments and Contingencies -

Commitments and Contingencies - Legal Matters (Details) - USA Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
PacifiCorp [Member]
Loss Contingencies [Line Items]
Loss contingency, damages and attorney fees awarded, value	$ 115
PacifiCorp [Member] | Damages from Breach of Contract, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	18
PacifiCorp [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded, value	113
Loss contingency, damages and attorney fees awarded, value	115
Loss Contingency, Damages Paid, Value	123
PacifiCorp [Member] | Damages from Unjust Enrichment, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	$ 113

Commitments and Contingencie119

Commitments and Contingencies - Commitments (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	$ 200
OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
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 - Legal Matters (Details) - PacifiCorp [Member] - USA Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Loss Contingencies [Line Items]
Loss contingency, damages and attorney fees awarded, value	$ 115
Loss contingency, damages awarded, value	113
Loss Contingency, Damages Paid, Value	123
Damages from Unjust Enrichment, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	$ 113

Commitments and Contingencie121

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
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 Contingencie122

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Accrued liability for estimated transmission billings refunds	$ 11
Electric Transmission [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity Adder, Percentage	0.50%
Prior to September 2016 [Member] | Electric Transmission [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
November 2013 to February 2015 [Member] | Electric Transmission [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] | Electric Transmission [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

Commitments and Contingencie123

Commitments and Contingencies Commitments and Contingencies - NPC - Environmental Laws and Regulations (Details) - Nevada Power Company [Member] - MW	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
812 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity	812
272 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			272
210 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			210
15 Megawatts of Solar Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity		15
100 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	100	100
35 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	35
143 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	143

Components of Accumulated Ot124

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (908)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	$ 18	$ 16	80	$ 10
Other comprehensive income (loss), foreign currency translation adjustment	(134)	(318)	(339)	(479)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	80	(103)	151	179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(3)	(7)	(2)	(13)
Other comprehensive income (loss)	(39)	(412)	(110)	(303)
Ending balance - Accumulated other comprehensive loss, net	(1,018)		(1,018)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits			(438)	(490)
Beginning balance - foreign currency translation adjustment			(1,092)	(412)
Beginning balance - unrealized gains (losses) on available-for-sale securities			615	390
Beginning balance - unrealized gains (losses) on cash flow hedges			7	18
Beginning balance - Accumulated other comprehensive loss, net			(908)	(494)
Other comprehensive income (loss), unrecognized amounts on retirement benefits			80	10
Other comprehensive income (loss), foreign currency translation adjustment			(339)	(479)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			151	179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(2)	(13)
Other comprehensive income (loss)			(110)	(303)
Ending balance - unrecognized amounts on retirement benefits	(358)	(480)	(358)	(480)
Ending balance - foreign currency translation adjustment	(1,431)	(891)	(1,431)	(891)
Ending balance - unrealized gains (losses) on available-for-sale securities	766	569	766	569
Ending balance - unrealized gains (losses) on cash flow hedges	5	5	5	5
Ending balance - Accumulated other comprehensive loss, net	$ (1,018)	$ (797)	$ (1,018)	$ (797)

Components of Accumulated Ot125

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (908)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	$ 80	$ (103)	151	$ 179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	(3)	(7)	(2)	(13)
Other comprehensive income (loss)	(39)	(412)	(110)	(303)
Ending balance - Accumulated other comprehensive loss, net	(1,018)		(1,018)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities			615	390
Beginning balance - unrealized gains (losses) on cash flow hedges			7	18
Beginning balance - Accumulated other comprehensive loss, net			(908)	(494)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			151	179
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(2)	(13)
Other comprehensive income (loss)			(110)	(303)
Ending balance - unrealized gains (losses) on available-for-sale securities	766	569	766	569
Ending balance - unrealized gains (losses) on cash flow hedges	5	5	5	5
Ending balance - Accumulated other comprehensive loss, net	(1,018)	(797)	(1,018)	(797)
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			(30)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	0	(1)	2	0
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	0	(3)	0	(7)
Other comprehensive income (loss)	0	(4)	2	(7)
Dividend, unrealized losses on cash flow hedges, transfer of operations			(90)
Ending balance - Accumulated other comprehensive loss, net	(1)		(1)
MidAmerican Energy Company [Member] | Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities			(3)	(3)
Beginning balance - unrealized gains (losses) on cash flow hedges			(27)	(20)
Beginning balance - Accumulated other comprehensive loss, net			(30)	(23)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			2	0
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			0	(7)
Other comprehensive income (loss)			2	(7)
Dividend, unrealized losses on cash flow hedges, transfer of operations			(27)
Ending balance - unrealized gains (losses) on available-for-sale securities	(1)	(3)	(1)	(3)
Ending balance - unrealized gains (losses) on cash flow hedges	0	(27)	0	(27)
Ending balance - Accumulated other comprehensive loss, net	$ (1)	$ (30)	$ (1)	$ (30)

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 5,092	$ 5,069	$ 13,254	$ 13,738
Sales revenue from energy operations	4,272	4,324	11,102	11,787
Real estate	820	745	2,152	1,951
Depreciation and amortization - energy operations	(639)	(609)	(1,898)	(1,794)
Depreciation and amortization	648	617	1,922	1,814
Operating income	1,585	1,536	3,392	3,473
Interest expense	460	475	1,401	1,423
Interest Costs Capitalized Adjustment	14	18	128	69
Allowance for equity funds	17	23	147	84
Interest and dividend income	39	27	93	79
Other, net	15	(9)	26	27
Income before income tax expense and equity income	1,210	1,120	2,385	2,309
Assets	85,888		85,888		$ 83,618
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,434	1,423	3,919	3,942
Depreciation and amortization - energy operations	(193)	(194)	(589)	(584)
Operating income	445	437	1,108	1,037
Interest expense	95	97	286	287
Assets	23,557		23,557		23,550
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	797	681	2,008	1,984
Depreciation and amortization - energy operations	(118)	(101)	(338)	(300)
Operating income	284	209	524	422
Interest expense	55	50	164	150
Assets	17,199		17,199		16,315
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	987	1,124	2,309	2,665
Depreciation and amortization - energy operations	(106)	(103)	(315)	(307)
Operating income	394	398	656	697
Interest expense	60	67	190	195
Assets	14,424		14,424		14,656
Northern Powergrid [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	220	265	748	852
Depreciation and amortization - energy operations	(49)	(50)	(149)	(148)
Operating income	90	129	373	452
Interest expense	33	37	105	108
Assets	6,727		6,727		7,317
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	201	196	704	736
Depreciation and amortization - energy operations	(53)	(51)	(160)	(151)
Operating income	68	66	320	322
Interest expense	13	16	39	51
Assets	5,115		5,115		4,953
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	169	153	309	428
Depreciation and amortization - energy operations	(61)	(56)	(177)	(147)
Operating income	81	62	35	166
Interest expense	40	37	114	110
Assets	8,493		8,493		7,553
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	273	269	582	583
Depreciation and amortization - energy operations	(57)	(55)	(169)	(160)
Operating income	157	153	233	225
Interest expense	51	49	148	144
Assets	6,775		6,775		5,892
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	820	745	2,152	1,951
Depreciation and amortization	9	8	24	20
Operating income	87	78	179	161
Interest expense	1	1	2	3
Assets	1,947		1,947		1,705
BHE And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	191	213	523	597
Depreciation and amortization - energy operations	(2)	(1)	(1)	(3)
Operating income	(21)	4	(36)	(9)
Interest expense	112	121	353	375
Assets	1,651		1,651		$ 1,677
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4,697	4,643	12,185	12,444
Income before income tax expense and equity income	1,089	962	1,945	1,785
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	220	265	748	852
Income before income tax expense and equity income	74	98	284	364
CANADA
Segment Reporting Information [Line Items]
Revenues	170	154	313	434
Income before income tax expense and equity income	43	41	114	119
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	5	7	8	8
Income before income tax expense and equity income	$ 4	$ 19	$ 42	$ 41

Segment Information - Goodwill

Segment Information - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,076
Acquisitions	46
Foreign currency translation	(18)
Other	(19)
Ending balance	9,085
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	2,102
NV Energy, Inc. [Member]
Goodwill [Roll Forward]
Beginning balance	2,369
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	2,369
Northern Powergrid [Member]
Goodwill [Roll Forward]
Beginning balance	1,056
Acquisitions	0
Foreign currency translation	(92)
Other	0
Ending balance	964
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	101
Acquisitions	0
Foreign currency translation	0
Other	(19)
Ending balance	82
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,428
Acquisitions	4
Foreign currency translation	77
Other	0
Ending balance	1,509
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	794
Acquisitions	41
Foreign currency translation	0
Other	0
Ending balance	835
Other [Member]
Goodwill [Roll Forward]
Beginning balance	2
Acquisitions	1
Foreign currency translation	(3)
Other	0
Ending balance	$ 0

Segment Information Segment Inf

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)OperatingSegmentsReportableSegments	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments			8
Revenues	$ 5,092	$ 5,069	$ 13,254	$ 13,738
Operating income	1,585	1,536	3,392	3,473
Assets	85,888		$ 85,888		$ 83,618
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Electric Domestic Regulated Revenue	692	585	$ 1,572	1,472
Revenues	795	680	2,004	1,974
Utilities Operating Expense, Depreciation and Amortization	118	101	338	300
Operating income	284	208	523	420
Assets	15,083		15,083		14,385
MidAmerican Energy Company [Member] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	692	585	1,572	1,472
Utilities Operating Expense, Depreciation and Amortization	107	91	306	270
Operating income	289	215	481	376
Assets	13,842		13,842		12,970
MidAmerican Energy Company [Member] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	102	94	430	499
Utilities Operating Expense, Depreciation and Amortization	11	10	32	30
Operating income	(5)	(6)	42	45
Assets	1,240		1,240		1,251
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	1	1	2	3
Assets	1		1		$ 164
MidAmerican Energy Company [Member] | Nonregulated Energy [Member]
Segment Reporting Information [Line Items]
Operating income	$ 0	$ (1)	$ 0	$ (1)

Segment Information Segment 129

Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)OperatingSegmentsReportableSegments	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Revenues		$ 5,092	$ 5,069	$ 13,254	$ 13,738
Operating income		1,585	1,536	3,392	3,473
Assets		85,888		$ 85,888		$ 83,618
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments				2
Electric Domestic Regulated Revenue		692	585	$ 1,572	1,472
Revenues		797	681	2,008	1,984
Utilities Operating Expense, Depreciation and Amortization		118	101	338	300
Operating income		284	209	524	422
Assets	[1]	16,372		16,372		15,674
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		692	585	1,572	1,472
Utilities Operating Expense, Depreciation and Amortization		107	91	306	270
Operating income		289	215	481	376
Assets	[1]	15,033		15,033		14,161
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		102	94	430	499
Utilities Operating Expense, Depreciation and Amortization		11	10	32	30
Operating income		(5)	(6)	42	45
Assets	[1]	1,319		1,319		1,330
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net		3	2	6	13
Operating income		0	$ 0	1	$ 1
Assets	[1]	$ 20		$ 20		$ 183
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Segment Information Segment 130

Segment Information Segment Information - SPPC (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)OperatingSegmentsTheNumberOfReportableSegments	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Revenues		$ 5,092	$ 5,069	$ 13,254	$ 13,738
Cost of sales		1,187	1,354	3,252	3,937
Operating income		1,585	1,536	3,392	3,473
Interest expense		460	475	1,401	1,423
Assets		85,888		$ 85,888		$ 83,618
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | TheNumberOfReportableSegments				2
Electric Domestic Regulated Revenue		207	228	$ 539	625
Gas Domestic Regulated Revenue		15	18	81	94
Revenues		222	246	620	719
Cost of sales		73	96	208	294
Cost of Purchased Oil and Gas		5	7	42	57
Cost of Sales		78	103	250	351
Gross Margin		144	143	370	368
Utilities Operating Expense, Maintenance and Operations		40	42	126	119
Utilities Operating Expense, Depreciation and Amortization		30	28	88	84
Operating income		69	66	138	146
Interest expense		12	16	42	46
Assets		3,472		3,472		3,487
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		207	228	539	625
Cost of sales		73	96	208	294
Gross Margin		134	132	331	331
Utilities Operating Expense, Maintenance and Operations		36	37	112	106
Utilities Operating Expense, Depreciation and Amortization		26	24	76	72
Operating income		68	65	127	136
Interest expense		11	14	38	42
Assets		3,087		3,087		3,060
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		15	18	81	94
Cost of Purchased Oil and Gas		5	7	42	57
Gross Margin		10	11	39	37
Utilities Operating Expense, Maintenance and Operations		4	5	14	13
Utilities Operating Expense, Depreciation and Amortization		4	4	12	12
Operating income		1	1	11	10
Interest expense		1	$ 2	4	$ 4
Assets		312		312		316
Sierra Pacific Power Company [Member] | Regulated common assets [Member]
Segment Reporting Information [Line Items]
Assets	[1]	$ 73		$ 73		$ 111
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations - MEC (

Discontinued Operations - MEC (Details) - MidAmerican Energy Company [Member] - Unregulated Retail Services [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Revenue	$ 240	$ 685
Discontinued Operations, Cost of sales	$ 232	648
Discontinued Operations, Cash flows from operations		$ 13
Discontinued Operations, Receivables			$ 115
Discontinued Operations, Derivative assets			41
Discontinued Operations, Deferred income tax assets, noncurrent			21
Discontinued Operations, Accounts payable			(49)
Discontinued Operations, Derivative liabilities			(42)
Discontinued Operations, Other assets and liabilities, net			4
Discontinued Operations, Net assets			90
Discontinued Operations, Accumulated other comprehensive loss, net			27
Discontinued Operations, Net assets and AOCI			$ 117

Related Party Transactions R132

Related Party Transactions Related Party Transactions PacifiCorp (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Related Party Transaction [Line Items]
Related party transaction, cash received for income taxes, net	$ 860	$ 1,800
PacifiCorp [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related party transaction, cash received for income taxes, net	$ 61	$ 35