Document

Cash and cash equivalents

Current assets:

103

Receivables, Net, Current

295

346

Income taxes receivable

104

Inventories

264

238

Other current assets

Total current assets

628

849

Property, plant and equipment, net

12,466

11,737

Goodwill

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

Accrued property, income and other taxes

183

125

Notes Payable, Related Parties, Current

139

Long-term Debt and Capital Lease Obligations, Current

250

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

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.

XML 43 R7.htm IDEA: XBRL DOCUMENT

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

XML 44 R8.htm IDEA: XBRL DOCUMENT

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	$ 1.00	$ 1.00
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000

XML 45 R9.htm IDEA: XBRL DOCUMENT

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

XML 46 R10.htm IDEA: XBRL DOCUMENT

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

XML 47 R11.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2016	Dec. 31, 2015
BHE shareholders' equity:
Common stock, par value	$ 0.00	$ 0.00
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77

XML 48 R12.htm IDEA: XBRL DOCUMENT

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

XML 49 R13.htm IDEA: XBRL DOCUMENT

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

XML 50 R14.htm IDEA: XBRL DOCUMENT

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Statements of Operations - MEC - USD ($) $ in Millions	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

XML 51 R15.htm IDEA: XBRL DOCUMENT

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

XML 52 R16.htm IDEA: XBRL DOCUMENT

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

XML 53 R17.htm IDEA: XBRL DOCUMENT

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

XML 54 R18.htm IDEA: XBRL DOCUMENT

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

XML 55 R19.htm IDEA: XBRL DOCUMENT

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

XML 56 R20.htm IDEA: XBRL DOCUMENT

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)

XML 57 R21.htm IDEA: XBRL DOCUMENT

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

XML 58 R22.htm IDEA: XBRL DOCUMENT

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)

XML 59 R23.htm IDEA: XBRL DOCUMENT

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)

XML 60 R24.htm IDEA: XBRL DOCUMENT

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

XML 61 R25.htm IDEA: XBRL DOCUMENT

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)

XML 62 R26.htm IDEA: XBRL DOCUMENT

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)

XML 63 R27.htm IDEA: XBRL DOCUMENT

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)

XML 64 R28.htm IDEA: XBRL DOCUMENT

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)

XML 65 R29.htm IDEA: XBRL DOCUMENT

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

XML 66 R30.htm IDEA: XBRL DOCUMENT

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

XML 67 R31.htm IDEA: XBRL DOCUMENT

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

XML 68 R32.htm IDEA: XBRL DOCUMENT

Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
Statements of Cash Flows - MEC - USD ($) $ in Millions	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

XML 69 R33.htm IDEA: XBRL DOCUMENT

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

XML 70 R34.htm IDEA: XBRL DOCUMENT

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

XML 71 R35.htm IDEA: XBRL DOCUMENT

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

XML 72 R36.htm IDEA: XBRL DOCUMENT

General	9 Months Ended
General	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.

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New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	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.

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Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2016

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.

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

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

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	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

Investments and Restricted Cash and Investments [Abstract]

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	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

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Regulatory Matters	9 Months Ended
Regulatory Matters	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.

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Investments and Restricted Cash and Investments

9 Months Ended

Sep. 30, 2016

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

XML 77 R41.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions	9 Months Ended
Recent Financing Transactions	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.

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Income Taxes

9 Months Ended

Sep. 30, 2016

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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	)%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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	)%

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2016

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	)

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

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	)

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	)

Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements.

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		)

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		)

XML 80 R44.htm IDEA: XBRL DOCUMENT

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.

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Risk Management and Hedging Activities

9 Months Ended

Sep. 30, 2016

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.



	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)

Not Designated as Hedging Contracts



	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



	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

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

Collateral and Contingent Features

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



	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

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 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



	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



	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

Collateral and Contingent Features

Refer to Note 9 of MidAmerican Energy's Notes to Financial Statements.

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.



	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

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 entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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Fair Value Measurements

9 Months Ended

Sep. 30, 2016


•	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 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.

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



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]


•	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 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.



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]


•	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 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.



	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



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]


•	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 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.



	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	)



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]


•	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 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.



	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

Accumulated Other Comprehensive Income (Loss) [Line Items]

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	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.

XML 84 R48.htm IDEA: XBRL DOCUMENT

Components of Accumulated Other Comprehensive Loss, Net

9 Months Ended

Sep. 30, 2016

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	)

Accumulated Other Comprehensive Income (Loss) [Line Items]

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.

Accumulated Other Comprehensive Income (Loss) [Line Items]

Components of Accumulated Other Comprehensive Income (Loss), Net

Refer to Note 12 of MidAmerican Energy's Notes to Financial Statements.

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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XML 85 R49.htm IDEA: XBRL DOCUMENT

Segment Information

9 Months Ended

Sep. 30, 2016

Segment Information



	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

Segment Information

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, 2016		December 31, 2015
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.

Segment Information

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, 2016		December 31, 2015
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.

Segment Information



	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.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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XML 86 R50.htm IDEA: XBRL DOCUMENT

Discontinued Operations

9 Months Ended

Sep. 30, 2016

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Discontinued Operations, Disclosure

Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Discontinued Operations, Disclosure

Discontinued Operations



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

The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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-Name Accounting Standards Codification
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XML 87 R51.htm IDEA: XBRL DOCUMENT

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.

XML 88 R52.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2016

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

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

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

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	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

Investments and Restricted Cash and Investments [Abstract]

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	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

XML 89 R53.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments (Tables)

9 Months Ended

Sep. 30, 2016

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

XML 90 R54.htm IDEA: XBRL DOCUMENT

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	%

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	)%

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	)%

XML 91 R55.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

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	)

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	)

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	)

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		)

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		)

XML 92 R56.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value



	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)

Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts



	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	)

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



	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

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



	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

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value



	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

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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

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

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	)



	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

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



	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



	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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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

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



	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	)

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

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Accumulated Other Comprehensive Income (Loss) [Line Items]

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

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Components of Accumulated Other Comprehensive Loss, Net (Tables)

9 Months Ended

Sep. 30, 2016

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	)

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	)

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Segment Reporting Information, by Segment



	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

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, 2016		December 31, 2015
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.

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, 2016		December 31, 2015
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.

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.

XML 96 R60.htm IDEA: XBRL DOCUMENT

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2016

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

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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XML 97 R61.htm IDEA: XBRL DOCUMENT

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

XML 98 R62.htm IDEA: XBRL DOCUMENT

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

XML 99 R63.htm IDEA: XBRL DOCUMENT

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

XML 100 R64.htm IDEA: XBRL DOCUMENT

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

XML 101 R65.htm IDEA: XBRL DOCUMENT

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)

XML 102 R66.htm IDEA: XBRL DOCUMENT

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

XML 103 R67.htm IDEA: XBRL DOCUMENT

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

XML 104 R68.htm IDEA: XBRL DOCUMENT

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, 2016 CAD	Nov. 30, 2014 CAD	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
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

XML 105 R69.htm IDEA: XBRL DOCUMENT

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

XML 106 R70.htm IDEA: XBRL DOCUMENT

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

XML 107 R71.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) CAD in Millions, $ in Millions	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	May 31, 2016 CAD	Apr. 30, 2016 USD ($)
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%

XML 108 R72.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) $ in Millions	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
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

XML 109 R73.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 01, 2016 USD ($)
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

XML 110 R74.htm IDEA: XBRL DOCUMENT

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%

XML 111 R75.htm IDEA: XBRL DOCUMENT

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	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%

XML 112 R76.htm IDEA: XBRL DOCUMENT

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes - MEC (Details) - USD ($) $ in Millions	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

XML 113 R77.htm IDEA: XBRL DOCUMENT

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

XML 114 R78.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 GBP (£)	Sep. 30, 2015 USD ($)
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

XML 115 R79.htm IDEA: XBRL DOCUMENT

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

XML 116 R80.htm IDEA: XBRL DOCUMENT

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)

XML 117 R81.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
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

XML 118 R82.htm IDEA: XBRL DOCUMENT

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)

XML 119 R83.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
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

XML 120 R84.htm IDEA: XBRL DOCUMENT

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

XML 121 R85.htm IDEA: XBRL DOCUMENT

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

XML 122 R86.htm IDEA: XBRL DOCUMENT

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

XML 123 R87.htm IDEA: XBRL DOCUMENT

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

XML 124 R88.htm IDEA: XBRL DOCUMENT

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)

XML 125 R89.htm IDEA: XBRL DOCUMENT

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

XML 126 R90.htm IDEA: XBRL DOCUMENT

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

XML 127 R91.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - Derivative Contract Volumes (Details) gal in Millions, MWh in Millions, Dth in Millions, $ in Millions	Sep. 30, 2016 USD ($) MWh gal Dth	Dec. 31, 2015 USD ($) MWh gal Dth
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)

XML 128 R92.htm IDEA: XBRL DOCUMENT

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

XML 129 R93.htm IDEA: XBRL DOCUMENT

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)

XML 130 R94.htm IDEA: XBRL DOCUMENT

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

XML 131 R95.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Sep. 30, 2016 MWh gal Dth	Dec. 31, 2015 MWh gal Dth
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)

XML 132 R96.htm IDEA: XBRL DOCUMENT

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

XML 133 R97.htm IDEA: XBRL DOCUMENT

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

Cash collateral, net receivable, offset against derivative positions

$ (178)

$ (237)

103

Derivative assets (liabilities), at fair value, net

(93)

(134)

Other Current Assets [Member]

Cash collateral, net receivable, offset against derivative positions

Derivative assets (liabilities), at fair value, net

Other Assets [Member]

Cash collateral, net receivable, offset against derivative positions

Derivative assets (liabilities), at fair value, net

Other Current Liabilities [Member]

Cash collateral, net receivable, offset against derivative positions

(85)

(145)

Derivative assets (liabilities), at fair value, net

(65)

(105)

Other Noncurrent Liabilities [Member]

Cash collateral, net receivable, offset against derivative positions

(198)

(195)

Derivative assets (liabilities), at fair value, net

(133)

(132)

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]

(132)

(188)

Not Designated as Hedging Instrument [Member] | Other Assets [Member]

Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

(61)

(109)

Designated as Hedging Instrument [Member]

(176)

(179)

Designated as Hedging Instrument [Member] | Other Current Assets [Member]

(46)

(49)

Designated as Hedging Instrument [Member] | Other Assets [Member]

Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

(24)

(36)

Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]

(22)

(16)

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

Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts

(124)

(186)

195

$ 185

250

$ 253

$ 233

$ 223

Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

113

Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

164

175

Commodity derivative [Member] | Designated as Hedging Instrument [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

MidAmerican Energy Company [Member] | Commodity derivative [Member]

Cash collateral, net receivable, offset against derivative positions

(4)

(72)

Derivative assets (liabilities), at fair value, net

(3)

(44)

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Assets [Member]

Cash collateral, net receivable, offset against derivative positions

Derivative assets (liabilities), at fair value, net

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Assets [Member]

Cash collateral, net receivable, offset against derivative positions

Derivative assets (liabilities), at fair value, net

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]

Cash collateral, net receivable, offset against derivative positions

(4)

(62)

Derivative assets (liabilities), at fair value, net

(3)

(40)

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]

Cash collateral, net receivable, offset against derivative positions

(2)

(23)

Derivative assets (liabilities), at fair value, net

(2)

(17)

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

^[1]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts

^[1]

(4)

(26)

$ 3

$ 23

$ 28

$ 38

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

^[1]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]

^[1]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

^[1]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

^[1]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

^[1]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

^[1]

(4)

(31)

Derivative asset, fair value, gross asset including not subject to master netting arrangement

^[1]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member]

^[1]

(2)

(8)

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]

(46)

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

(31)

Derivative asset, fair value, gross asset including not subject to master netting arrangement

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Not Designated as Hedging Instrument [Member]

$ 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.

XML 134 R98.htm IDEA: XBRL DOCUMENT

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

XML 135 R99.htm IDEA: XBRL DOCUMENT

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)

XML 136 R100.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - MEC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2016 MWh Dth	Dec. 31, 2015 MWh Dth
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

XML 137 R101.htm IDEA: XBRL DOCUMENT

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

XML 138 R102.htm IDEA: XBRL DOCUMENT

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

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]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

113

Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

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]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

Nevada Power Company [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

Recurring [Member] | Nevada Power Company [Member]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Recurring [Member] | Level 3 [Member]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Recurring [Member] | Level 3 [Member] | Nevada Power Company [Member]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

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.

XML 139 R103.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - NPC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2016 MWh Dth	Dec. 31, 2015 MWh Dth
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

XML 140 R104.htm IDEA: XBRL DOCUMENT

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

XML 141 R105.htm IDEA: XBRL DOCUMENT

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)

XML 142 R106.htm IDEA: XBRL DOCUMENT

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

XML 143 R107.htm IDEA: XBRL DOCUMENT

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

XML 144 R108.htm IDEA: XBRL DOCUMENT

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

XML 145 R109.htm IDEA: XBRL DOCUMENT

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

XML 146 R110.htm IDEA: XBRL DOCUMENT

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

103

Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset

Derivative liability, fair value, gross asset and right to reclaim cash, offset

3,228

2,692

103

119

Recurring [Member] | Money market mutual funds [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | United States government obligations [Member]

557

421

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | International government obligations [Member]

156

133

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Corporate obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Municipal obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Agency, asset and mortgage-backed obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Auction rate securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | United States companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | International companies [Member]

249

239

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Investment funds [Member]

1,483

1,244

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member]

174

136

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | Money market mutual funds [Member]

2,620

2,173

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | United States government obligations [Member]

557

421

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | International government obligations [Member]

156

133

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | Corporate obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | Municipal obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

Recurring [Member] | Level 1 [Member] | Auction rate securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | United States companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | International companies [Member]

249

239

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 1 [Member] | Investment funds [Member]

1,483

1,244

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member]

174

136

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | Money market mutual funds [Member]

509

393

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | United States government obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | International government obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | Corporate obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | Municipal obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

Recurring [Member] | Level 2 [Member] | Auction rate securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | United States companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | International companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 2 [Member] | Investment funds [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | Money market mutual funds [Member]

117

142

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | United States government obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | International government obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | Corporate obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | Municipal obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

Recurring [Member] | Level 3 [Member] | Auction rate securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | United States companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | International companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Recurring [Member] | Level 3 [Member] | Investment funds [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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

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

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

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

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

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

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

MidAmerican Energy Company [Member] | Recurring [Member] | Money market mutual funds [Member]

534

522

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | United States government obligations [Member]

^[1]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | International government obligations [Member]

156

133

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Corporate obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Municipal obligations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Auction rate securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | United States companies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | International companies [Member]

249

239

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Investment funds [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Money market mutual funds [Member]

471

438

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | United States government obligations [Member]

^[1]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | International government obligations [Member]

156

133

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

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]

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]

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]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | International companies [Member]

249

239

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | United States government obligations [Member]

^[1]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

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]

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]

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]

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]

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]

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]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | United States government obligations [Member]

^[1]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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]

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]

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]

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]

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]

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]

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]

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]

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

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

Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset

^[2]

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

Derivative liability, fair value, gross asset and right to reclaim cash, offset

^[2]

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

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

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

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

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

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.

XML 147 R111.htm IDEA: XBRL DOCUMENT

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

XML 148 R112.htm IDEA: XBRL DOCUMENT

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

XML 149 R113.htm IDEA: XBRL DOCUMENT

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

XML 150 R114.htm IDEA: XBRL DOCUMENT

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]

Nevada Power Company [Member] | Investment Funds [Member] | Level 1 [Member]

$ 6

$ 5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Nevada Power Company [Member] | Investment Funds [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Nevada Power Company [Member] | Investment Funds [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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

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

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

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

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

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]

XML 151 R115.htm IDEA: XBRL DOCUMENT

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)

XML 152 R116.htm IDEA: XBRL DOCUMENT

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

XML 153 R117.htm IDEA: XBRL DOCUMENT

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

XML 154 R118.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies - Legal Matters (Details) - USA Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
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

XML 155 R119.htm IDEA: XBRL DOCUMENT

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

XML 156 R120.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Legal Matters (Details) - PacifiCorp [Member] - USA Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
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

XML 157 R121.htm IDEA: XBRL DOCUMENT

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

XML 158 R122.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
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%

XML 159 R123.htm IDEA: XBRL DOCUMENT

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

XML 160 R124.htm IDEA: XBRL DOCUMENT

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)

XML 161 R125.htm IDEA: XBRL DOCUMENT

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)

XML 162 R126.htm IDEA: XBRL DOCUMENT

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Segment Information (Details) - USD ($) $ in Millions	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

XML 163 R127.htm IDEA: XBRL DOCUMENT

Segment Information - Goodwill (Details) $ in Millions	9 Months Ended
Segment Information - Goodwill (Details) $ in Millions	Sep. 30, 2016 USD ($)
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

XML 164 R128.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
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)

XML 165 R129.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - MidAmerican Funding (Details)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2016

USD ($)

Sep. 30, 2015

USD ($)

Sep. 30, 2016

USD ($)

OperatingSegments

ReportableSegments

Sep. 30, 2015

USD ($)

Dec. 31, 2015

USD ($)

Number of reportable segments | OperatingSegments

$ 5,092

$ 5,069

$ 13,254

$ 13,738

1,585

1,536

3,392

3,473

85,888

$ 85,888

$ 83,618

Number of reportable segments | ReportableSegments

692

585

$ 1,572

1,472

Utilities Operating Expense, Depreciation and Amortization

797

681

2,008

1,984

118

101

338

300

284

209

524

422

MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]

^[1]

16,372

15,674

Utilities Operating Expense, Depreciation and Amortization

692

585

1,572

1,472

107

306

270

289

215

481

376

MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]

^[1]

15,033

14,161

Gas Domestic Regulated Revenue

102

430

499

Utilities Operating Expense, Depreciation and Amortization

(5)

(6)

MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]

^[1]

1,319

1,330

Other Revenue, Net

$ 0

$ 1

^[1]

$ 20

$ 183

[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

XML 166 R130.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - SPPC (Details)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2016

USD ($)

Sep. 30, 2015

USD ($)

Sep. 30, 2016

USD ($)

OperatingSegments

TheNumberOfReportableSegments

Sep. 30, 2015

USD ($)

Dec. 31, 2015

USD ($)

Number of reportable segments | OperatingSegments

$ 5,092

$ 5,069

$ 13,254

$ 13,738

Cost of sales

1,187

1,354

3,252

3,937

1,585

1,536

3,392

3,473

460

475

1,401

1,423

85,888

$ 85,888

$ 83,618

Number of reportable segments | TheNumberOfReportableSegments

Gas Domestic Regulated Revenue

207

228

$ 539

625

Cost of Purchased Oil and Gas

222

246

620

719

Cost of sales

208

294

Cost of Sales

103

250

351

Gross Margin

144

143

370

368

Utilities Operating Expense, Maintenance and Operations

126

119

Utilities Operating Expense, Depreciation and Amortization

138

146

Sierra Pacific Power Company [Member] | Electric Operations [Member]

3,472

3,487

Utilities Operating Expense, Maintenance and Operations

207

228

539

625

Cost of sales

208

294

Gross Margin

134

132

331

112

106

Utilities Operating Expense, Depreciation and Amortization

127

136

Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]

3,087

3,060

Gas Domestic Regulated Revenue

Cost of Purchased Oil and Gas

Gross Margin

Utilities Operating Expense, Maintenance and Operations

Utilities Operating Expense, Depreciation and Amortization

$ 2

$ 4

Sierra Pacific Power Company [Member] | Regulated common assets [Member]

312

316