Document

Cash and cash equivalents

Current assets:

512

Receivables, Net, Current

318

287

Income taxes receivable

Inventories

235

264

Other current assets

Total current assets

1,086

610

Property, plant and equipment, net

13,602

12,835

Goodwill

1,270

Regulatory assets

1,335

1,161

Investments and restricted cash and investments

709

655

Other assets

194

216

Total assets

^[1]

18,196

16,747

Current liabilities:

Accounts payable

256

302

Accrued interest

Accrued property, income and other taxes

227

138

Notes Payable, Related Parties, Current

Short-term debt

Long-term Debt and Capital Lease Obligations, Current

350

250

Other current liabilities

159

160

Total current liabilities

1,098

1,032

Long-term Debt and Capital Lease Obligations

4,870

4,377

Deferred income taxes

3,777

3,568

Regulatory liabilities

927

883

Asset retirement obligations

515

510

Other long-term liabilities

307

291

Total liabilities

11,494

10,661

Commitments and contingencies

Equity:

Additional paid-in capital

1,679

Retained earnings

5,023

4,407

Total member's equity

6,702

6,086

Total liabilities and equity

$ 18,196

$ 16,747

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

XML 44 R8.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - NPC - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Trade receivables, net	1,994	1,751
Inventories	887	925
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated other comprehensive loss, net	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	69	279
Trade receivables, net	362	243
Inventories	59	73
Regulatory Assets, Current	34	20
Other current assets	50	38
Total current assets	574	653
Public Utilities, Property, Plant and Equipment, Net	6,890	6,997
Regulatory assets	1,110	1,000
Other assets	39	39
Total assets	8,613	8,689
Current liabilities:
Accounts payable	192	187
Accrued interest	39	50
Accrued property, income and other taxes	109	93
Regulatory Liability, Current	35	37
Long-term Debt and Financial and Capital Lease Obligations, Current	842	17
Customer Deposits, Current	78	78
Other current liabilities	31	39
Total current liabilities	1,326	501
Long-term Debt and Financial and Capital Lease Obligations	2,231	3,049
Regulatory liabilities	423	416
Deferred income taxes	1,529	1,474
Other long-term liabilities	281	277
Total liabilities	5,790	5,717
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	518	667
Accumulated other comprehensive loss, net	(3)	(3)
Total BHE shareholders' equity	2,823	2,972
Total liabilities and equity	$ 8,613	$ 8,689

XML 45 R9.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Sep. 30, 2017	Dec. 31, 2016
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 46 R10.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - SPPC - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Trade receivables, net	1,994	1,751
Inventories	887	925
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated Other Comprehensive Income (Loss), Net of Tax	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	30	55
Trade receivables, net	102	117
Inventories	47	45
Regulatory Assets, Current	38	25
Other current assets	20	13
Total current assets	237	255
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Regulatory assets	400	410
Other assets	8	6
Total assets	3,507	3,493
Current liabilities:
Accounts payable	75	146
Accrued interest	11	14
Accrued property, income and other taxes	11	10
Regulatory Liability, Current	17	69
Long-term Debt and Financial and Capital Lease Obligations, Current	1	1
Customer Deposits, Current	15	16
Other current liabilities	18	12
Total current liabilities	148	268
Long-term Debt and Financial and Capital Lease Obligations	1,151	1,152
Regulatory liabilities	223	221
Deferred income taxes	663	617
Other long-term liabilities	134	127
Total liabilities	2,319	2,385
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	78	(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1)	(1)
Total BHE shareholders' equity	1,188	1,108
Total liabilities and equity	$ 3,507	$ 3,493

XML 47 R11.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Sep. 30, 2017	Dec. 31, 2016
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 48 R12.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2017	Dec. 31, 2016
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 49 R13.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Energy	$ 4,322	$ 4,272	$ 11,501	$ 11,102
Real estate	961	820	2,502	2,152
Total operating revenue	5,283	5,092	14,003	13,254
Energy:
Cost of sales	1,212	1,187	3,380	3,252
Operating expense	930	948	2,763	2,739
Depreciation and amortization	635	639	1,905	1,898
Real estate	882	733	2,311	1,973
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Interest Costs Capitalized Adjustment	14	14	34	128
Allowance for equity funds	24	17	59	147
Interest and dividend income	32	39	85	93
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Equity income	30	36	80	96
Net income	1,078	1,047	2,228	2,087
Net income attributable to noncontrolling interests	10	11	30	25
Net income attributable to BHE shareholders	$ 1,068	$ 1,036	$ 2,198	$ 2,062

XML 50 R14.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating costs and expenses:
Operating income	$ 1,624	$ 1,585	$ 3,644	$ 3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,430	1,434	3,956	3,919
Operating costs and expenses:
Cost of Domestic Regulated Electric	465	478	1,305	1,295
Utilities Operating Expense, Maintenance and Operations	248	272	754	800
Utilities Operating Expense, Depreciation and Amortization	200	193	598	576
Utilities Operating Expense, Taxes	50	47	149	141
Utilities Operating Expense	963	990	2,806	2,812
Operating income	467	444	1,150	1,107
Other income (expense):
Interest expense	(95)	(95)	(285)	(285)
Interest Costs Capitalized Adjustment	4	4	12	12
Allowance for equity funds	7	7	21	21
Other, net	6	3	13	9
Total other income (expense)	(78)	(81)	(239)	(243)
Income before income tax expense and equity income	389	363	911	864
Income tax expense	126	110	294	270
Net income attributable to BHE shareholders	$ 263	$ 253	$ 617	$ 594

XML 51 R15.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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	106	103	489	432
Total operating revenue	813	795	2,166	2,004
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of gas sold and other	54	55	288	237
Utilities Operating Expense, Maintenance and Operations	200	180	547	510
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	525	511	1,636	1,481
Operating income	288	284	530	523
Other income (expense):
Interest expense	(54)	(50)	(160)	(147)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	5	3	13	8
Total other income (expense)	(34)	(38)	(113)	(119)
Income before income tax expense and equity income	254	246	417	404
Income tax expense	(131)	(74)	(207)	(123)
Net Income (Loss) Attributable to Parent	$ 385	$ 320	$ 624	$ 527

XML 52 R16.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Other Interest and Dividend Income	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	108	105	493	436
Total operating revenue	815	797	2,170	2,008
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	54	56	289	239
Utilities Operating Expense, Maintenance and Operations	202	181	549	511
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	527	513	1,639	1,484
Operating income	288	284	531	524
Other income (expense):
Other Interest and Dividend Income	(59)	(55)	(177)	(164)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	6	3	14	9
Total other income (expense)	(38)	(43)	(129)	(135)
Income before income tax expense and equity income	250	241	402	389
Income tax expense	(133)	(77)	(214)	(129)
Net Income (Loss) Attributable to Parent	$ 383	$ 318	$ 616	$ 518

XML 53 R17.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cost of sales	$ 1,212	$ 1,187	$ 3,380	$ 3,252
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	819	766	1,785	1,690
Cost of sales	318	251	721	618
Utilities Operating Expense, Maintenance and Operations	97	105	278	304
Utilities Operating Expense, Depreciation and Amortization	77	76	231	227
Utilities Operating Expense, Taxes	10	10	29	30
Total operating costs and expenses	502	442	1,259	1,179
Operating income	317	324	526	511
Interest expense	44	45	132	140
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	2
Allowance for equity funds	0	0	1	3
Other, net	5	7	18	17
Total other income (expense)	(38)	(38)	(112)	(118)
Income before income tax expense and equity income	279	286	414	393
Income tax expense	103	98	151	136
Net income attributable to BHE shareholders	$ 176	$ 188	$ 263	$ 257

XML 54 R18.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Cost of sales	1,212	1,187	3,380	3,252
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	215	207	534	539
Gas Domestic Regulated Revenue	15	15	66	81
Total operating revenue	230	222	600	620
Cost of sales	76	73	193	208
Cost of Purchased Oil and Gas	4	5	26	42
Utilities Operating Expense, Maintenance and Operations	40	40	121	126
Utilities Operating Expense, Depreciation and Amortization	29	30	85	88
Utilities Operating Expense, Taxes	6	5	18	18
Total operating costs and expenses	155	153	443	482
Operating income	75	69	157	138
Interest expense	11	12	33	42
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	1
Allowance for equity funds	1	1	2	2
Other, net	2	2	4	3
Total other income (expense)	(7)	(9)	(26)	(36)
Income before income tax expense and equity income	68	60	131	102
Income tax expense	24	22	46	37
Net income attributable to BHE shareholders	$ 44	$ 38	$ 85	$ 65

XML 55 R19.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,078	$ 1,047	$ 2,228	$ 2,087
Other comprehensive income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	(15)	(18)	(16)	(80)
Foreign currency translation adjustment	227	(134)	535	(339)
Unrealized gains (losses) on available-for-sale securities, net of tax	423	80	542	151
Unrealized losses on cash flow hedges, net of tax	1	(3)	(5)	(2)
Total other comprehensive (loss) income, net of tax	666	(39)	1,088	(110)
Comprehensive income	1,744	1,008	3,316	1,977
Comprehensive income attributable to noncontrolling interests	10	11	30	25
Comprehensive income attributable to BHE shareholders	$ 1,734	$ 997	$ 3,286	$ 1,952

XML 56 R20.htm IDEA: XBRL DOCUMENT

Statements of Comprehensive Income - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 1,068	$ 1,036	$ 2,198	$ 2,062
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Comprehensive income attributable to BHE shareholders	1,734	997	3,286	1,952
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	$ 385	$ 320	$ 624	527
Other comprehensive income (loss)				$ 2

XML 57 R21.htm IDEA: XBRL DOCUMENT

Statements of Comprehensive Income (Parenthetical) - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized (losses) gains on available-for-sale securities, tax	$ 284	$ 53	$ 355	$ 89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

XML 58 R22.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 1,068	$ 1,036	$ 2,198	$ 2,062
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Comprehensive income attributable to BHE shareholders	1,734	997	3,286	1,952
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	$ 383	$ 318	$ 616	518
Other comprehensive income (loss)				$ 2

XML 59 R23.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income (Parenthetical) - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized (losses) gains on available-for-sale securities, tax	$ 284	$ 53	$ 355	$ 89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

XML 60 R24.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 1	$ 7	$ (3)	$ 26
Unrealized (losses) gains on available-for-sale securities, tax	284	53	355	89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

XML 61 R25.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, 2015		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
Balance at Sep. 30, 2016	$ 24,496	$ 0	6,404	18,968	(1,018)	142
Balance (shares) at Dec. 31, 2016	77	77
Balance at Dec. 31, 2016	$ 24,463	$ 0	6,390	19,448	(1,511)	136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,212	0	0	2,198	0	14
Other comprehensive income (loss)	1,088	0	0	0	1,088	0
Distributions	(16)	0	0	0	0	(16)
Common stock purchases	(19)	0	(1)	(18)	0	0
Conversion of Stock, Amount Converted	(100)	0	(6)	(94)	0	0
Other equity transactions	$ (24)	$ 0	(21)	0	0	(3)
Balance (shares) at Sep. 30, 2017	77	77
Balance at Sep. 30, 2017	$ 27,604	$ 0	$ 6,362	$ 21,534	$ (423)	$ 131

XML 62 R26.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Changes in Equity - PacifiCorp - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	PacifiCorp [Member]	PacifiCorp [Member] Preferred Stock [Member]	PacifiCorp [Member] Common Stock [Member]	PacifiCorp [Member] Additional Paid-in Capital [Member]	PacifiCorp [Member] Retained Earnings [Member]	PacifiCorp [Member] Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 7,503	$ 2	$ 0	$ 4,479	$ 3,033	$ (11)
Net Income (Loss) Attributable to Parent	$ 2,062					594				594
Total other comprehensive (loss) income, net of tax	(110)	$ 0	$ 0	$ 0	$ (110)
Dividends, Common Stock, Cash						(550)				(550)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						7,547	2	0	4,479	3,077	(11)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327					7,390	2	0	4,479	2,921	(12)
Net Income (Loss) Attributable to Parent	2,198					617				617
Total other comprehensive (loss) income, net of tax	1,088	$ 0	$ 0	$ 0	$ 1,088
Dividends, Common Stock, Cash						(500)				(500)
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 7,507	$ 2	$ 0	$ 4,479	$ 3,038	$ (12)

XML 63 R27.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, 2015					$ 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					5,143	561	4,583	(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				5,160	561	4,599	0
Net Income (Loss) Attributable to Parent	2,198				624		624
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity, Other	(24)	$ 0	$ 0	$ 0
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473				$ 5,784	$ 561	$ 5,223	$ 0

XML 64 R28.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, 2015					$ 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					6,071	1,679	4,393	(1)
Stockholders' Equity, Other	9	1	0	0	(1)		(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				6,086	1,679	4,407	0
Net Income (Loss) Attributable to Parent	2,198				616		616
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	27,473				$ 6,702	$ 1,679	$ 5,023	$ 0
Stockholders' Equity, Other	$ (24)	$ (21)	$ 0	$ 0

XML 65 R29.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, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 3,163	$ 0	$ 2,308	$ 858	$ (3)
Net Income (Loss) Attributable to Parent	$ 2,062					257			257
Dividends, Common Stock, Cash						365			365
Stockholders' Equity, Other	$ (9)	$ 0	$ (1)	$ 0	$ 0	1			1
Balance (shares) at Sep. 30, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						$ 3,054	$ 0	2,308	749	(3)
Balance (shares) at Dec. 31, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ 24,327					$ 2,972	$ 0	2,308	667	(3)
Net Income (Loss) Attributable to Parent	2,198					263			263
Dividends, Common Stock, Cash						$ 412			412
Stockholders' Equity, Other	$ 24	$ 0	$ 21	$ 0	$ 0
Balance (shares) at Sep. 30, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 2,823	$ 0	$ 2,308	$ 518	$ (3)

XML 66 R30.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, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 1,076	$ 0	$ 1,111	$ (35)	$ 0
Net Income (Loss) Attributable to Parent	$ 2,062					65			65
Dividends, Common Stock, Cash						45	0		45	0
Stockholders' Equity, Other	$ (9)	$ 0	$ (1)	$ 0	$ 0	(1)	$ 0	0		1
Balance (shares) at Sep. 30, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						$ 1,095	$ 0	1,111	(15)	(1)
Balance (shares) at Dec. 31, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ 24,327					$ 1,108	$ 0	1,111	(2)	(1)
Net Income (Loss) Attributable to Parent	2,198					85			85
Dividends, Common Stock, Cash						$ 5			5
Stockholders' Equity, Other	$ 24	$ 0	$ 21	$ 0	$ 0
Balance (shares) at Sep. 30, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 1,188	$ 0	$ 1,111	$ 78	$ (1)

XML 67 R31.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 2,228	$ 2,087
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	1,943	1,922
Allowance for equity funds	(59)	(147)
Equity income, net of distributions	(14)	(62)
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Deferred income taxes and amortization of investment tax credits	573	546
Other, net	13	(60)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Cash flows from investing activities:
Capital expenditures	(3,179)	(3,521)
Acquisitions, net of cash acquired	(1,102)	(66)
Increase in restricted cash and investments	(45)	(48)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Equity method investments	(54)	(462)
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Cash flows from financing activities:
Repayments of Long-term Debt	(1,344)	(1,500)
Common stock purchases	(19)	0
Proceeds from subsidiary debt	1,562	1,484
Repayments of subsidiary debt	(834)	(1,613)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Effect of exchange rate changes	6	(5)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	$ 1,142	$ 1,018

XML 68 R32.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(59)	(147)
Deferred income taxes and amortization of investment tax credits	573	546
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	13	(60)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Derivative collateral, net	(16)	22
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Net proceeds from (repayments of) short-term debt	(365)	(887)
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	617	594
Utilities Operating Expense, Depreciation and Amortization	598	576
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(21)	(21)
Deferred income taxes and amortization of investment tax credits	14	76
Increase (Decrease) in Regulatory Assets and Liabilities	21	85
Other Noncash Income (Expense)	1	6
Increase (Decrease) in Accounts Receivable and Other Operating Assets	25	19
Derivative collateral, net	(4)	2
Increase (Decrease) in Inventories	(1)	(32)
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	75	133
Accounts payable and other liabilities	110	(66)
Net cash flows from operating activities	1,435	1,372
Capital expenditures	(553)	(586)
Other, net	32	26
Net cash flows from investing activities	(521)	(560)
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(54)	(56)
Net proceeds from (repayments of) short-term debt	(270)	(20)
Payments of Ordinary Dividends, Common Stock	(500)	(550)
Other, net	(3)	0
Net cash flows from financing activities	(827)	(626)
Net change in cash and cash equivalents	87	186
Cash and cash equivalents at beginning of period	17	12
Cash and cash equivalents at end of period	$ 104	$ 198

XML 69 R33.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, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Other Noncash Income (Expense)	13	(60)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	624	527
Utilities Operating Expense, Depreciation and Amortization	369	338
Deferred income taxes and amortization of investment tax credits	64	113
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	28	34
Other Noncash Income (Expense)	(23)	(42)
Increase (Decrease) in Accounts and Other Receivables	(28)	(67)
Increase (Decrease) in Inventories	29	(26)
Derivative collateral, net	3	4
Pension and other postretirement benefit plans	(8)	(5)
Increase (Decrease) in Accounts Payable	(5)	14
Accrued property, income and other taxes	98	160
Increase (Decrease) in Other Current Assets and Liabilities, Net	20	30
Net cash flows from operating activities	1,171	1,080
Capital expenditures	(1,162)	(1,129)
Purchases of available-for-sale securities	(126)	(96)
Proceeds from sales of available-for-sale securities	127	92
Other, net	0	5
Net cash flows from investing activities	(1,161)	(1,128)
Proceeds from Issuance of Long-term Debt	842	33
Repayments of Long-term Debt	(255)	(38)
Net proceeds from short-term debt	(99)	0
Net cash flows from financing activities	488	(5)
Net change in cash and cash equivalents	498	(53)
Cash and cash equivalents at beginning of period	14	103
Cash and cash equivalents at end of period	$ 512	$ 50

XML 70 R34.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Other Noncash Income (Expense)	13	(60)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	616	518
Utilities Operating Expense, Depreciation and Amortization	369	338
Deferred income taxes and amortization of investment tax credits	64	113
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	28	34
Other Noncash Income (Expense)	(24)	(42)
Increase (Decrease) in Accounts and Other Receivables	(31)	(67)
Increase (Decrease) in Inventories	29	(26)
Derivative collateral, net	3	4
Pension and other postretirement benefit plans	(8)	(5)
Increase (Decrease) in Accounts Payable	(4)	14
Accrued property, income and other taxes	96	160
Increase (Decrease) in Other Current Assets and Liabilities, Net	14	24
Net cash flows from operating activities	1,152	1,065
Capital expenditures	(1,162)	(1,129)
Purchases of available-for-sale securities	(126)	(96)
Proceeds from sales of available-for-sale securities	127	92
Other, net	(3)	5
Net cash flows from investing activities	(1,164)	(1,128)
Proceeds from Issuance of Long-term Debt	842	33
Repayments of Long-term Debt	(255)	(38)
Increase (Decrease) in Notes Payable, Related Parties, Current	21	16
Net proceeds from short-term debt	(99)	0
Net cash flows from financing activities	509	11
Net change in cash and cash equivalents	497	(52)
Cash and cash equivalents at beginning of period	15	103
Cash and cash equivalents at end of period	$ 512	$ 51

XML 71 R35.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Allowance for equity funds	(59)	(147)
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	13	(60)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Acquisitions, net of cash acquired	(1,102)	(66)
Payments for (Proceeds from) Other Investing Activities	12	47
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at end of period	1,142	1,018
Cash and cash equivalents at beginning of period	721	1,108
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	263	257
Other Nonrecurring (Income) Expense	(1)	0
Utilities Operating Expense, Depreciation and Amortization	231	227
Deferred income taxes and amortization of investment tax credits	61	52
Allowance for equity funds	(1)	(3)
Increase (Decrease) in Regulatory Assets and Liabilities	25	139
Deferred Energy Change	(22)	(3)
Amortization of Deferred Charges	13	(87)
Other Noncash Income (Expense)	(1)	3
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(122)	(96)
Increase (Decrease) in Inventories	6	7
Accrued property, income and other taxes	11	98
Accounts payable and other liabilities	9	7
Net cash flows from operating activities	472	601
Capital expenditures	(202)	(249)
Acquisitions, net of cash acquired	(77)	0
Payments for (Proceeds from) Other Investing Activities	(4)	0
Net cash flows from investing activities	(275)	(249)
Repayments of Long-term Debt	(86)	(221)
Payments of Ordinary Dividends, Common Stock	(412)	(365)
Net cash flows from financing activities	(407)	(586)
Net change in cash and cash equivalents	(210)	(234)
Cash and cash equivalents at end of period	69	302
Cash and cash equivalents at beginning of period	$ 279	$ 536

XML 72 R36.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Allowance for equity funds	(59)	(147)
Deferred income taxes and amortization of investment tax credits	573	546
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	(13)	60
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	85	65
Utilities Operating Expense, Depreciation and Amortization	85	88
Allowance for equity funds	(2)	(2)
Deferred income taxes and amortization of investment tax credits	46	37
Increase (Decrease) in Regulatory Assets and Liabilities	9	(14)
Deferred Energy Change	(23)	55
Amortization of Deferred Charges	(43)	(35)
Other Noncash Income (Expense)	0	1
Increase (Decrease) in Accounts Receivable and Other Operating Assets	13	12
Increase (Decrease) in Inventories	(2)	1
Accrued property, income and other taxes	(2)	0
Accounts payable and other liabilities	(54)	(15)
Net cash flows from operating activities	112	191
Capital expenditures	(131)	(137)
Net cash flows from investing activities	(131)	(137)
Proceeds from Issuance of Long-term Debt	0	1,089
Repayments of Long-term Debt	(1)	(1,137)
Payments of Ordinary Dividends, Common Stock	(5)	(45)
Net cash flows from financing activities	(6)	(93)
Net change in cash and cash equivalents	(25)	(39)
Cash and cash equivalents at beginning of period	55	106
Cash and cash equivalents at end of period	$ 30	$ 67

XML 73 R37.htm IDEA: XBRL DOCUMENT

General	9 Months Ended
General	Sep. 30, 2017
Segment Reporting Information [Line Items]
General/Organization and Operations	General Berkshire Hathaway Energy Company ("BHE") is a holding company that owns a highly diversified portfolio of locally-managed businesses principally engaged in the energy industry (collectively with its subsidiaries, the "Company") and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The Company is organized as eight business segments: PacifiCorp, MidAmerican Funding, LLC ("MidAmerican Funding") (which primarily consists of MidAmerican Energy Company ("MidAmerican Energy")), NV Energy, Inc. ("NV Energy") (which primarily consists of Nevada Power Company ("Nevada Power") and Sierra Pacific Power Company ("Sierra Pacific")), Northern Powergrid Holdings Company ("Northern Powergrid") (which primarily consists of Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc), BHE Pipeline Group (which consists of Northern Natural Gas Company ("Northern Natural Gas") and Kern River Gas Transmission Company ("Kern River")), BHE Transmission (which consists of BHE Canada Holdings Corporation ("AltaLink") (which primarily consists of AltaLink, L.P. ("ALP")) and BHE U.S. Transmission, LLC), BHE Renewables (which primarily consists of BHE Renewables, LLC and CalEnergy Philippines) and HomeServices of America, Inc. (collectively with its subsidiaries, "HomeServices"). The Company, through these locally managed and operated businesses, owns four utility companies in the United States serving customers in 11 states, two electricity distribution companies in Great Britain, two interstate natural gas pipeline companies in the United States, an electric transmission business in Canada, interests in electric transmission businesses in the United States, a renewable energy business primarily 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, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016 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, 2017.
PacifiCorp [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General PacifiCorp, which includes PacifiCorp and its subsidiaries, is a United States regulated electric utility company serving retail customers, including residential, commercial, industrial, irrigation and other customers in portions of Utah, Oregon, Wyoming, Washington, Idaho and California. PacifiCorp owns, or has interests in, a number of thermal, hydroelectric, wind-powered and geothermal generating facilities, as well as electric transmission and distribution assets. PacifiCorp also buys and sells electricity on the wholesale market with other utilities, energy marketing companies, financial institutions and other market participants. PacifiCorp is subject to comprehensive state and federal regulation. PacifiCorp's subsidiaries support its electric utility operations by providing coal mining services. PacifiCorp is an indirect subsidiary of Berkshire Hathaway Energy Company ("BHE"), a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016. 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, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017 and 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 PacifiCorp's Annual Report on Form 10-K for the year ended December 31, 2016 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, 2017.
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, 2017, and for the three- and nine-month periods ended September 30, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017, 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, 2016, 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, 2017.
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, 2017, and for the three- and nine-month periods ended September 30, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017, are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in MidAmerican Funding's Annual Report on Form 10-K for the year ended December 31, 2016, 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, 2017.
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, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016. 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, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Nevada Power's Annual Report on Form 10-K for the year ended December 31, 2016 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, 2017.
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, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016. 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, 2017 and 2016. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Sierra Pacific's Annual Report on Form 10-K for the year ended December 31, 2016 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, 2017.

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New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-12, which amends FASB Accounting Standards Codification ("ASC") Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity’s ability to hedge non-financial and financial risk components and reduces complexity in fair value hedges of interest rate risk. In addition, it eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item and also eases certain documentation and assessment requirements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The Company is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. The Company plans to adopt this guidance effective January 1, 2018. The Company does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. The Company plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. 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. The material impacts currently identified include recording the unrealized gains and losses on available-for-sale securities in the Consolidated Statements of Operations as opposed to other comprehensive income ("OCI"). For the nine-month periods ended September 30, 2017 and 2016, these amounts, net of tax, were 542 million and 151 million, respectively. 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 and 2017, 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 plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. The Company currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when the Company has the right to invoice as it corresponds directly with the value to the customer of the Company’s performance to date. The Company's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by regulated energy, nonregulated energy and real estate, with further disaggregation of regulated energy by jurisdiction and real estate by line of business.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. PacifiCorp plans to adopt this guidance effective January 1, 2018. PacifiCorp does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. 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. PacifiCorp does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which 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 and 2017, 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 plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. PacifiCorp currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when PacifiCorp has the right to invoice as it corresponds directly with the value to the customer of PacifiCorp’s performance to date. PacifiCorp plans to quantitatively disaggregate revenue in the required financial statement footnote by customer class.
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. MidAmerican Energy plans to adopt this guidance effective January 1, 2018. MidAmerican Energy does not believe this will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents must be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. 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 plans to adopt this guidance effective January 1, 2018, and does not believe the adoption of this guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. 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 plans to adopt this guidance effective January 1, 2018, and does not believe the adoption of this guidance will have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy plans to adopt this guidance effective January 1, 2019, and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements. 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. MidAmerican Energy does not believe this guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which 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 and 2017, 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 plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements. MidAmerican Energy currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when MidAmerican Energy has the right to invoice as it corresponds directly with the value to the customer of MidAmerican Energy’s performance to date. MidAmerican Energy's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by jurisdiction for each segment.
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 March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. Nevada Power plans to adopt this guidance effective January 1, 2018. Nevada Power does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. 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 and 2017, 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 plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. Nevada Power currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when Nevada Power has the right to invoice as it corresponds directly with the value to the customer of Nevada Power’s performance to date. Nevada Power's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by customer class.
Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. Sierra Pacific plans to adopt this guidance effective January 1, 2018. Sierra Pacific does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. 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 plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. 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 and 2017, 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 plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. Sierra Pacific currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when Sierra Pacific has the right to invoice as it corresponds directly with the value to the customer of Sierra Pacific’s performance to date. Sierra Pacific's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by segment and customer class.

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Business Acquisitions (Notes)	9 Months Ended
Business Acquisitions (Notes)	Sep. 30, 2017
Business Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Business Acquisitions The Company completed various acquisitions totaling $1.1 billion, net of cash acquired, for the nine-month period ended September 30, 2017. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses, development and construction costs for the 110-megawatt Alamo 6 solar project and the 50-megawatt Pearl solar project, and the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power. As a result of the various acquisitions, the Company acquired assets of $1.1 billion, assumed liabilities of $476 million and recognized goodwill of $522 million.

XML 76 R40.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2017

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



		As of
	Depreciable	September 30,			December 31,
	Life	2017			2016
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	73,138		$	71,536
Interstate natural gas pipeline assets	3-80 years	6,991			6,942
		80,129			78,478
Accumulated depreciation and amortization		(24,525		)	(23,603		)
Regulated assets, net		55,604			54,875

Nonregulated assets:
Independent power plants	5-30 years	5,911			5,594
Other assets	3-30 years	1,265			1,002
		7,176			6,596
Accumulated depreciation and amortization		(1,304		)	(1,060		)
Nonregulated assets, net		5,872			5,536

Net operating assets		61,476			60,411
Construction work-in-progress		3,503			2,098
Property, plant and equipment, net		$	64,979		$	62,509

Construction work-in-progress includes $3.1 billion as of September 30, 2017 and $1.8 billion as of December 31, 2016, 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	2017			2016
Utility plant in service, net:
Generation	20-70 years	$	11,339		$	11,282
Transmission	52-75 years	1,802			1,726
Electric distribution	20-75 years	3,297			3,197
Gas distribution	29-75 years	1,606			1,565
Utility plant in service		18,044			17,770
Accumulated depreciation and amortization		(5,765		)	(5,448		)
Utility plant in service, net		12,279			12,322
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		12,285			12,328
Construction work-in-progress		1,302			493
Property, plant and equipment, net		$	13,587		$	12,821

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



		As of
		September 30,			December 31,
	Depreciable Life	2017			2016

Property, plant and equipment in-service	5-75 years	$	27,599		$	27,298
Accumulated depreciation and amortization		(9,222		)	(8,793		)
Net property, plant and equipment in-service		18,377			18,505
Construction work-in-progress		758			657
Total property, plant and equipment, net		$	19,135		$	19,162

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2017			2016
Utility plant:
Generation	30 - 55 years	$	3,725		$	4,271
Distribution	20 - 65 years	3,294			3,231
Transmission	45 - 65 years	1,860			1,846
General and intangible plant	5 - 65 years	784			738
Utility plant		9,663			10,086
Accumulated depreciation and amortization		(2,840		)	(3,205		)
Utility plant, net		6,823			6,881
Other non-regulated, net of accumulated depreciation and amortization	45 years	2			2
Plant, net		6,825			6,883
Construction work-in-progress		65			114
Property, plant and equipment, net		$	6,890		$	6,997

Acquisitions

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	2017			2016
Utility plant:
Electric generation	25 - 60 years	$	1,140		$	1,137
Electric distribution	20 - 100 years	1,445			1,417
Electric transmission	50 - 100 years	782			771
Electric general and intangible plant	5 - 70 years	182			164
Natural gas distribution	35 - 70 years	388			381
Natural gas general and intangible plant	5 - 70 years	14			15
Common general	5 - 70 years	290			267
Utility plant		4,241			4,152
Accumulated depreciation and amortization		(1,496		)	(1,442		)
Utility plant, net		2,745			2,710
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,750			2,715
Construction work-in-progress		112			107
Property, plant and equipment, net		$	2,862		$	2,822

XML 77 R41.htm IDEA: XBRL DOCUMENT

Regulatory Matters	9 Months Ended
Regulatory Matters	Sep. 30, 2017
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In May 2015, MGM Resorts International ("MGM") and Wynn Las Vegas, LLC ("Wynn"), filed applications with the PUCN to purchase energy from alternative providers of a new electric resource and become distribution only service customers of Nevada Power. 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. In December 2015, the applicants 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 September 2016, MGM and Wynn paid impact fees of $82 million and $15 million, respectively. In October 2016, MGM and Wynn became distribution only service customers and started procuring energy from another energy supplier. In April 2017, Wynn filed a motion with the PUCN seeking relief from the January 2016 order and requested the PUCN adopt an alternative impact fee and revise on-going charges associated with retirement of assets and high cost renewable contracts. In May 2017, a stipulation reached between MGM, Regulatory Operations Staff and the Bureau of Consumer Protection was filed requiring Nevada Power to credit $16 million as an offset against MGM's remaining impact fee obligation and, in June 2017, the PUCN approved the stipulation as filed. In September 2016, Switch, Ltd. ("Switch"), a customer of Nevada Power, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Nevada Power. In December 2016, the PUCN approved a stipulation agreement that allows Switch to purchase energy from alternative providers subject to conditions, including paying an impact fee to Nevada Power. In May 2017, Switch paid impact fees of $27 million and, in June 2017, Switch became a distribution only service customer and started procuring energy from another energy supplier. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Nevada Power, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Nevada Power. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Nevada Power. Emissions Reduction and Capacity Replacement Plan ("ERCR Plan") In March 2017, Nevada Power retired Reid Gardner Unit 4, a 257-MW coal-fueled generating facility. The early retirement was approved by the PUCN in December 2016 as a part of Nevada Power's second amendment to the ERCR Plan. The remaining net book value of $151 million was moved from property, plant and equipment, net to noncurrent regulatory assets on the Consolidated Balance Sheet in March 2017, in compliance with the ERCR Plan. Refer to Note 9 for additional information on the ERCR Plan.
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Regulatory Rate Review In June 2016, Sierra Pacific filed an electric regulatory rate review with the PUCN. The filing requested no incremental annual revenue relief. In October 2016, Sierra Pacific filed with the PUCN a settlement agreement resolving most, but not all, issues in the proceeding and reduced Sierra Pacific's electric revenue requirement by $3 million spread evenly to all rate classes. In December 2016, the PUCN approved the settlement agreement and established an additional six MW of net metering capacity under the grandfathered rates, which are those net metering rates that were in effect prior to January 2016; the order establishes cost-based rates and a value-based excess energy credit for customers who choose to install private generation after the six MW limitation is reached. The new rates were effective January 1, 2017. In January 2017, Sierra Pacific filed a petition for reconsideration relating to the creation of the additional six megawatts ("MW") of net metering at the grandfathered rates. Sierra Pacific believes the effects of the PUCN decision result in additional cost shifting to non-net metering customers and reduces the stipulated rate reduction for other customer classes. In June 2017, the PUCN denied the petition for reconsideration. In June 2016, Sierra Pacific filed a gas regulatory rate review with the PUCN. The filing requested a slight decrease in its incremental annual revenue requirement. In October 2016, Sierra Pacific filed with the PUCN a settlement agreement resolving all issues in the proceeding and reduced Sierra Pacific's gas revenue requirement by $2 million. In December 2016, the PUCN approved the settlement agreement. The new rates were effective January 1, 2017. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In September 2016, Switch, Ltd. ("Switch"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In December 2016, the PUCN approved a stipulation agreement that allows Switch to purchase energy from alternative providers subject to conditions. In June 2017, Switch became a distribution only service customer and started procuring energy from another energy supplier. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Sierra Pacific. In May 2017, Peppermill Resort Spa Casino ("Peppermill"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In August 2017, the PUCN approved a stipulation allowing Peppermill to purchase energy from alternative providers subject to conditions, including paying an impact fee. In September 2017, Peppermill provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers.

XML 78 R42.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments

9 Months Ended

Sep. 30, 2017

Investments and Restricted Cash and Investments

Investments and restricted cash and investments consists of the following (in millions):



	As of
	September 30,		December 31,
	2017		2016
Investments:
BYD Company Limited common stock	$	2,087	$	1,185
Rabbi trusts	431		403
Other	132		106
Total investments	2,650		1,694

Equity method investments:
BHE Renewables tax equity investments	804		741
Electric Transmission Texas, LLC	693		672
Bridger Coal Company	140		165
Other	158		142
Total equity method investments	1,795		1,720

Restricted cash and investments:
Quad Cities Station nuclear decommissioning trust funds	498		460
Other	317		282
Total restricted cash and investments	815		742

Total investments and restricted cash and investments	$	5,260	$	4,156

Reflected as:
Other current assets	$	273	$	211
Noncurrent assets	4,987		3,945
Total investments and restricted cash and investments	$	5,260	$	4,156

Investments

XML 79 R43.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions	9 Months Ended
Recent Financing Transactions	Sep. 30, 2017
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In the first nine months of 2017, BHE repaid at par value a total of $944 million, plus accrued interest, of its junior subordinated debentures due December 2044. In September 2017, HomeServices entered into a $250 million unsecured amortizing term loan due September 2022. The amortizing term loan has an underlying variable interest rate based on the London Interbank Offered Rate ("LIBOR") plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. The net proceeds were used to fund the repayment or reimbursement of amounts provided by BHE for the costs related to acquisitions. In July 2017, Northern Powergrid Metering Limited entered into a £200 million secured amortizing corporate facility with a stated maturity of June 2026. The amortizing facility has a variable interest rate based on the LIBOR plus a spread that varies based on an agreed-upon schedule. In July 2017, Northern Powergrid Metering Limited received proceeds of £120 million under the facility to repay amounts provided by Yorkshire Electricity Group plc which provides internal funds for the continuing smart meter deployment program of Northern Powergrid Metering Limited. Northern Powergrid Metering Limited has entered into interest rate swaps that fix the underlying interest rate on 85% of the outstanding debt. In July 2017, Cordova Funding Corporation redeemed the remaining $89 million of its 8.48% to 9.07% Series A Senior Secured Bonds due December 2019, CE Generation, LLC redeemed the remaining $51 million of its 7.416% Senior Secured Bonds due December 2018, and Salton Sea Funding Corporation redeemed the remaining $20 million of its 7.475% Senior Secured Series F Bonds due November 2018, each at redemption prices determined in accordance with the terms of the respective indentures. In June 2017, BHE issued $100 million of its 5.0% junior subordinated debentures due June 2057 in exchange for 181,819 shares of BHE no par value common stock held by a minority shareholder. The junior subordinated debentures are redeemable at BHE's option at any time from and after June 15, 2037, at par plus accrued and unpaid interest. In May 2017, Alamo 6, LLC issued $232 million of its 4.17% Senior Secured Notes due March 2042. The principal of the notes amortizes beginning March 2018 with a final maturity in March 2042. The net proceeds were used to fund the repayment or reimbursement of amounts provided by BHE for the costs related to the development, construction and financing of a 110-megawatt solar project in Texas. In April 2017, Kern River redeemed the remaining $175 million of its 4.893% Senior Notes due April 2018 at a redemption price determined in accordance with the terms of the indenture. In February 2017, MidAmerican Energy issued $375 million of its 3.10% First Mortgage Bonds due May 2027 and $475 million of its 3.95% First Mortgage Bonds due August 2047. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2016 to February 1, 2017, with respect to investments in MidAmerican Energy's 551-megawatt Wind X and 2,000-megawatt Wind XI projects, which were previously financed with MidAmerican Energy's general funds. In February 2017, MidAmerican Energy redeemed in full through optional redemption its $250 million of 5.95% Senior Notes due July 2017. Credit Facilities In September 2017, HomeServices terminated its $350 million unsecured credit facility expiring July 2018 and entered into a $600 million unsecured credit facility expiring September 2022. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at HomeServices' option, plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. In June 2017, BHE extended, with lender consent, the maturity date to June 2020 for its $2.0 billion unsecured credit facility and PacifiCorp extended, with lender consent, the maturity date to June 2020 for its $400 million unsecured credit facility, each by exercising the first of two available one-year extensions. In June 2017, PacifiCorp terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $600 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports PacifiCorp's commercial paper program and 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 Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. The credit facility requires 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. In June 2017, MidAmerican Energy terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $900 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. The credit facility requires MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. In June 2017, Nevada Power amended its $400 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power's option, plus a spread that varies based on Nevada Power's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Nevada Power's ratio of consolidated debt, including current maturities, to total capitalization not to exceed 0.65 to 1.0 as of the last day of each quarter. In June 2017, Sierra Pacific amended its $250 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific's option, plus a spread that varies based on Sierra Pacific's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Sierra Pacific'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. In May 2017, BHE entered into a $1.0 billion unsecured credit facility expiring May 2018. 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 Eurodollar rate or a base rate, at BHE's option, plus a spread that varies based on BHE's credit ratings for its senior unsecured long-term debt securities. The credit facility requires 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.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In January 2017, Nevada Power (1) issued a notice to the bondholders for the repurchase of the remaining outstanding amounts of its $38 million Pollution Control Revenue Bonds, Series 2006 and $38 million Pollution Control Revenue Bonds, Series 2006A and (2) redeemed the Pollution Control Revenue Bonds, Series 2006A, aggregate principal amount outstanding plus accrued interest with the use of cash on hand. In February 2017, Nevada Power redeemed the Pollution Control Revenue Bonds, Series 2006, aggregate principal amount outstanding plus accrued interest with the use of cash on hand. In May 2017, Nevada Power entered into a Financing Agreement with Clark County, Nevada (the "Clark Issuer") whereby the Clark Issuer loaned to Nevada Power the proceeds from the issuance, on behalf of Nevada Power, of $39.5 million of its 1.60% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017, due 2036 ("Series 2017 Bonds"). The Series 2017 Bonds are subject to mandatory purchase by Nevada Power in May 2020, and on and after the purchase date, the interest rate may be adjusted from time to time. In May 2017, Nevada Power entered into a Financing Agreement with the Coconino County, Arizona Pollution Control Corporation (the "Coconino Issuer") whereby the Coconino Issuer loaned to Nevada Power the proceeds from the issuance, on behalf of Nevada Power, of $40 million of its 1.80% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017A, due 2032 and $13 million of its 1.60% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017B, due 2039 (collectively, the "Series 2017AB Bonds"). The Series 2017AB Bonds are subject to mandatory purchase by Nevada Power in May 2020, and on and after the purchase date, the interest rate may be adjusted from time to time. To provide collateral security for its obligations, Nevada Power issued its General and Refunding Mortgage Notes, Series AA, No. AA-1 in the amount of $39.5 million and No. AA-2 in the amount of $53 million (collectively, the "Series AA Notes").The obligation of Nevada Power to make any payment of the principal and interest on any Series AA Notes is discharged to the extent Nevada Power has made payment on the Series 2017 Bonds and the Series 2017AB Bonds. The collective proceeds from the tax-exempt bond issuances were used to refund at par value, plus accrued interest, the Clark Issuer's $39.5 million of Pollution Control Refunding Revenue Bonds, Series 2006 and the Coconino Issuer's $40 million of Pollution Control Refunding Revenue Bonds, Series 2006A and $13 million of Pollution Control Refunding Revenue Bonds, Series 2006B, each previously issued on behalf of Nevada Power. In June 2017, Nevada Power amended its $400 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power's option, plus a spread that varies based on Nevada Power's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Nevada Power's ratio of consolidated debt, including current maturities, to total capitalization not to exceed 0.65 to 1.0 as of the last day of each quarter.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In June 2017, PacifiCorp extended, with lender consent, the maturity date to June 2020 for its $400 million unsecured credit facility by exercising the first of two available one-year extensions. In June 2017, PacifiCorp terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $600 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program and certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have a variable interest rate based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. These credit facilities require 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.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In February 2017, MidAmerican Energy issued $375 million of its 3.10% First Mortgage Bonds due May 2027 and $475 million of its 3.95% First Mortgage Bonds due August 2047. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2016 to February 1, 2017, with respect to investments in MidAmerican Energy's 551-megawatt Wind X and 2,000-megawatt Wind XI projects, which were previously financed with MidAmerican Energy's general funds. In February 2017, MidAmerican Energy redeemed in full through optional redemption its $250 million of 5.95% Senior Notes due July 2017. Credit Facilities In June 2017, MidAmerican Energy terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $900 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. The credit facility requires MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In June 2017, Sierra Pacific amended its $250 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific's option, plus a spread that varies based on Sierra Pacific's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Sierra Pacific'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.

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Income Taxes

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(19	)	(16	)	(18	)	(15	)
State income tax, net of federal income tax benefit	—		—		(1	)	—
Income tax effect of foreign income	(3	)	(3	)	(4	)	(4	)
Equity income	1		1		1		1
Other, net	1		(1	)	—		—
Effective income tax rate	15	%	16	%	13	%	17	%

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 is as follows:



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(74	)	(58	)	(74	)	(58	)
State income tax, net of federal income tax benefit	(10	)	(6	)	(7	)	(4	)
Effects of ratemaking	(2	)	(1	)	(4	)	(3	)
Other, net	(1	)	—		—		—
Effective income tax rate	(52	)%	(30	)%	(50	)%	(30	)%

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 is as follows:



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(76	)	(60	)	(76	)	(61	)
State income tax, net of federal income tax benefit	(10	)	(7	)	(8	)	(4	)
Effects of ratemaking	(2	)	—		(4	)	(3	)
Effective income tax rate	(53	)%	(32	)%	(53	)%	(33	)%

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2017

Domestic Operations

Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions):



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Pension:
Service cost	$	6		$	7		$	18		$	22
Interest cost	29			31			87			94
Expected return on plan assets	(40		)	(39		)	(120		)	(120		)
Net amortization	7			12			22			36
Net periodic benefit cost	$	2		$	11		$	7		$	32

Other postretirement:
Service cost	$	3		$	2		$	7		$	7
Interest cost	7			7			21			23
Expected return on plan assets	(9		)	(10		)	(30		)	(31		)
Net amortization	(3		)	(2		)	(10		)	(9		)
Net periodic benefit credit	$	(2	)	$	(3	)	$	(12	)	$	(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,
	2017			2016			2017			2016

Service cost	$	6		$	5		$	19		$	16
Interest cost	15			17			44			55
Expected return on plan assets	(25		)	(27		)	(74		)	(85		)
Settlement	18			—			18			—
Net amortization	17			11			50			34
Net periodic benefit cost	$	31		$	6		$	57		$	20

Net periodic benefit (credit) 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,
	2017			2016			2017			2016
Pension:
Service cost	$	—		$	1		$	—		$	3
Interest cost	12			14			37			41
Expected return on plan assets	(18		)	(18		)	(54		)	(56		)
Net amortization	3			8			10			25
Net periodic benefit (credit) cost	$	(3	)	$	5		$	(7	)	$	13

Other postretirement:
Service cost	$	1		$	1		$	2		$	2
Interest cost	3			3			10			11
Expected return on plan assets	(5		)	(5		)	(16		)	(16		)
Net amortization	(1		)	(1		)	(4		)	(4		)
Net periodic benefit credit	$	(2	)	$	(2	)	$	(8	)	$	(7	)

Net periodic benefit (credit) cost 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,
	2017			2016			2017			2016
Pension:
Service cost	$	2		$	3		$	7		$	8
Interest cost	8			8			23			25
Expected return on plan assets	(11		)	(11		)	(33		)	(33		)
Net amortization	—			—			1			1
Net periodic benefit (credit) cost	$	(1	)	$	—		$	(2	)	$	1

Other postretirement:
Service cost	$	2		$	1		$	4		$	4
Interest cost	3			2			7			7
Expected return on plan assets	(3		)	(3		)	(10		)	(10		)
Net amortization	(1		)	(1		)	(3		)	(3		)
Net periodic benefit cost (credit)	$	1		$	(1	)	$	(2	)	$	(2	)

Refer to Note 6 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,
	2017			2016
Qualified Pension Plan -
Other long-term liabilities	$	(27	)	$	(24	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(9		)	(9		)

Other Postretirement Plans -
Other long-term liabilities	(4		)	(4		)

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,
	2017			2016
Qualified Pension Plan -
Other long-term liabilities	$	(13	)	$	(12	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(9		)	(9		)

Other Postretirement Plans -
Other long-term liabilities	(25		)	(28		)

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Risk Management and Hedging Activities

9 Months Ended

Sep. 30, 2017

Risk Management and Hedging Activities

There have been no significant changes in the Company's accounting policies related to derivatives. Refer to Note 10 for additional information on derivative contracts.



	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of September 30, 2017
Not designated as hedging contracts:
Commodity assets⁽¹⁾	$	16		$	93	$	7		$	3		$	119
Commodity liabilities⁽¹⁾	(1		)	—		(60		)	(135		)	(196		)
Interest rate assets	22			—		—			—			22
Interest rate liabilities	—			—		(3		)	(7		)	(10		)
Total	37			93		(56		)	(139		)	(65		)

Designated as hedging contracts:
Commodity assets	—			—		2			6			8
Commodity liabilities	—			—		(11		)	(17		)	(28		)
Interest rate assets	—			6		—			—			6
Interest rate liabilities	—			—		(1		)	—			(1		)
Total	—			6		(10		)	(11		)	(15		)

Total derivatives	37			99		(66		)	(150		)	(80		)
Cash collateral receivable	—			—		21			64			85
Total derivatives - net basis	$	37		$	99	$	(45	)	$	(86	)	$	5



	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of December 31, 2016
Not designated as hedging contracts:
Commodity assets⁽¹⁾	$	42		$	86	$	5		$	2		$	135
Commodity liabilities⁽¹⁾	(10		)	—		(46		)	(150		)	(206		)
Interest rate assets	15			—		—			—			15
Interest rate liabilities	—			—		(4		)	(6		)	(10		)
Total	47			86		(45		)	(154		)	(66		)

Designated as hedging contracts:
Commodity assets	1			—		2			3			6
Commodity liabilities	—			—		(14		)	(8		)	(22		)
Interest rate assets	—			8		—			—			8
Interest rate liabilities	—			—		(3		)	—			(3		)
Total	1			8		(15		)	(5		)	(11		)

Total derivatives	48			94		(60		)	(159		)	(77		)
Cash collateral receivable	—			—		13			61			74
Total derivatives - net basis	$	48		$	94	$	(47	)	$	(98	)	$	(3	)

(1)

Not Designated as Hedging Contracts



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	162		$	185		$	148		$	250
Changes in fair value recognized in net regulatory assets	10			18			43			5
Net (losses) gains reclassified to operating revenue	(5		)	(3		)	9			(6		)
Net losses reclassified to cost of sales	(5		)	(5		)	(38		)	(54		)
Ending balance	$	162		$	195		$	162		$	195

Designated as Hedging Contracts



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	21		$	26		$	16		$	46
Changes in fair value recognized in OCI	5			15			28			35
Net gains reclassified to operating revenue	—			1			—			1
Net losses reclassified to cost of sales	(7		)	(7		)	(25		)	(47		)
Ending balance	$	19		$	35		$	19		$	35

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	2017		2016

Electricity purchases	Megawatt hours	9		5
Natural gas purchases	Decatherms	339		271
Fuel purchases	Gallons	2		11
Interest rate swaps	US$	694		714
Interest rate swaps	£	102		—
Mortgage sale commitments, net	US$	(442	)	(309	)

Credit Risk

Collateral and Contingent Features

Risk Management and Hedging Activities

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, 2017
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	4		$	1	$	2		$	—		$	7
Commodity liabilities	(1		)	—		(24		)	(82		)	(107		)
Total	3			1		(22		)	(82		)	(100		)

Total derivatives	3			1		(22		)	(82		)	(100		)
Cash collateral receivable	—			—		16			57			73
Total derivatives - net basis	$	3		$	1	$	(6	)	$	(25	)	$	(27	)

As of December 31, 2016
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	24		$	2	$	1		$	—		$	27
Commodity liabilities	(6		)	—		(14		)	(84		)	(104		)
Total	18			2		(13		)	(84		)	(77		)

Total derivatives	18			2		(13		)	(84		)	(77		)
Cash collateral receivable	—			—		10			59			69
Total derivatives - net basis	$	18		$	2	$	(3	)	$	(25	)	$	(8	)


(1)	PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $97 million and $73 million, respectively, was recorded related to the net derivative liability of $100 million and $77 million, respectively.

Not Designated as Hedging Contracts



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	95		$	89		$	73		$	133
Changes in fair value recognized in net regulatory assets	6			15			36			(4		)
Net (losses) gains reclassified to operating revenue	(5		)	(2		)	8			8
Net gains (losses) reclassified to energy costs	1			—			(20		)	(35		)
Ending balance	$	97		$	102		$	97		$	102

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	2017		2016

Electricity sales	Megawatt hours	(3	)	(3	)
Natural gas purchases	Decatherms	97		84
Fuel oil purchases	Gallons	2		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, 2017, PacifiCorp's credit ratings from the three recognized credit rating agencies were investment grade.

Risk Management and Hedging Activities

There have been no significant changes in Nevada Power's accounting policies related to derivatives. Refer to Note 8 for additional information on derivative contracts.



	Other			Other
	Current			Long-term
	Liabilities			Liabilities			Total
As of September 30, 2017
Commodity liabilities⁽¹⁾	$	(3	)	$	(1	)	$	(4	)

As of December 31, 2016
Commodity liabilities⁽¹⁾	$	(7	)	$	(7	)	$	(14	)


(1)	Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 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 (in millions):



		As of
	Unit of	September 30,	December 31,
	Measure	2017	2016

Electricity sales	Megawatt hours	—	(2	)
Natural gas purchases	Decatherms	149	114

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, 2017, credit ratings from the three recognized credit rating agencies were investment grade.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2017

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 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 financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of September 30, 2017
Assets:
Commodity derivatives	$	1		$	24		$	102		$	(19	)	$	108
Interest rate derivatives	—			14			14			—			28
Mortgage loans held for sale	—			534			—			—			534
Money market mutual funds⁽²⁾	855			—			—			—			855
Debt securities:
United States government obligations	168			—			—			—			168
International government obligations	—			5			—			—			5
Corporate obligations	—			37			—			—			37
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			1			—			—			1
Equity securities:
United States companies	270			—			—			—			270
International companies	2,094			—			—			—			2,094
Investment funds	182			—			—			—			182
	$	3,570		$	617		$	116		$	(19	)	$	4,284
Liabilities:
Commodity derivatives	$	(1	)	$	(207	)	$	(16	)	$	104		$	(120	)
Interest rate derivatives	—			(10		)	(1		)	—			(11		)
	$	(1	)	$	(217	)	$	(17	)	$	104		$	(131	)



As of December 31, 2016
Assets:
Commodity derivatives	$	5		$	49		$	87		$	(22	)	$	119
Interest rate derivatives	—			16			7			—			23
Mortgage loans held for sale	—			359			—			—			359
Money market mutual funds⁽²⁾	586			—			—			—			586
Debt securities:
United States government obligations	161			—			—			—			161
International government obligations	—			3			—			—			3
Corporate obligations	—			36			—			—			36
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			2			—			—			2
Equity securities:
United States companies	250			—			—			—			250
International companies	1,190			—			—			—			1,190
Investment funds	147			—			—			—			147
	$	2,339		$	467		$	94		$	(22	)	$	2,878
Liabilities:
Commodity derivatives	$	(2	)	$	(199	)	$	(27	)	$	96		$	(132	)
Interest rate derivatives	(1		)	(11		)	(1		)	—			(13		)
	$	(3	)	$	(210	)	$	(28	)	$	96		$	(145	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $74 million as of September 30, 2017 and December 31, 2016, 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
2017:
Beginning balance	$	81		$	8		$	—	$	60		$	6		$	—
Changes included in earnings	7			34			—		19			100			—
Changes in fair value recognized in OCI	(1		)	—			—		(3		)	—			—
Changes in fair value recognized in net regulatory assets	(3		)	—			—		(5		)	—			—
Purchases	—			8			—		1			6			—
Settlements	2			(37		)	—		14			(99		)	—
Ending balance	$	86		$	13		$	—	$	86		$	13		$	—



	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



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	36,124	$	41,197	$	36,116	$	40,718

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 financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3		Other⁽¹⁾			Total
As of September 30, 2017
Assets:
Commodity derivatives	$	—	$	7		$	—	$	(3	)	$	4
Money market mutual funds⁽²⁾	100		—			—		—			100
Investment funds	20		—			—		—			20
	$	120	$	7		$	—	$	(3	)	$	124

Liabilities - Commodity derivatives	$	—	$	(107	)	$	—	$	76		$	(31	)

As of December 31, 2016
Assets:
Commodity derivatives	$	—	$	27		$	—	$	(7	)	$	20
Money market mutual funds⁽²⁾	13		—			—		—			13
Investment funds	17		—			—		—			17
	$	30	$	27		$	—	$	(7	)	$	50

Liabilities - Commodity derivatives	$	—	$	(104	)	$	—	$	76		$	(28	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $73 million and $69 million as of September 30, 2017 and December 31, 2016, 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, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	7,005	$	8,277	$	7,052	$	8,204

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 financial assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of September 30, 2017:
Assets:
Commodity derivatives	$	—	$	2		$	2		$	(2	)	$	2
Money market mutual funds⁽²⁾	520		—			—			—			520
Debt securities:
United States government obligations	168		—			—			—			168
International government obligations	—		5			—			—			5
Corporate obligations	—		37			—			—			37
Municipal obligations	—		2			—			—			2
Agency, asset and mortgage-backed obligations	—		1			—			—			1
Equity securities:
United States companies	270		—			—			—			270
International companies	7		—			—			—			7
Investment funds	15		—			—			—			15
	$	980	$	47		$	2		$	(2	)	$	1,027

Liabilities - commodity derivatives	$	—	$	(6	)	$	(4	)	$	2		$	(8	)



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2016:
Assets:
Commodity derivatives	$	—	$	9		$	1		$	(2	)	$	8
Money market mutual funds⁽²⁾	1		—			—			—			1
Debt securities:
United States government obligations	161		—			—			—			161
International government obligations	—		3			—			—			3
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Agency, asset and mortgage-backed obligations	—		2			—			—			2
Equity securities:
United States companies	250		—			—			—			250
International companies	5		—			—			—			5
Investment funds	9		—			—			—			9
	$	426	$	52		$	1		$	(2	)	$	477

Liabilities - commodity derivatives	$	—	$	(3	)	$	(3	)	$	3		$	(3	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016, 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
2017:
Beginning balance	$	(1	)	$	—	$	(2	)	$	—
Changes in fair value recognized in net regulatory assets	(2		)	—		(2		)	—
Settlements	1			—		2			—
Ending balance	$	(2	)	$	—	$	(2	)	$	—

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



	As of September 30, 2017				As of December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	4,894	$	5,446	$	4,301	$	4,735

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



	As of September 30, 2017				As of December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,220	$	5,873	$	4,627	$	5,164

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 financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of September 30, 2017
Assets - investment funds	$	2	$	—	$	—		$	2

Liabilities - commodity derivatives	$	—	$	—	$	(4	)	$	(4	)

As of December 31, 2016
Assets:
Money market mutual funds⁽¹⁾	$	220	$	—	$	—		$	220
Investment funds	6		—		—			6
	$	226	$	—	$	—		$	226

Liabilities - commodity derivatives	$	—	$	—	$	(14	)	$	(14	)


(1)	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which Nevada Power transacts. When quoted prices for identical contracts are not available, Nevada Power uses forward price curves. Forward price curves represent Nevada Power's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Nevada Power bases its forward price curves upon internally developed models, with internal and external fundamental data inputs. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to markets that are not active. Given that limited market data exists for these contracts, Nevada Power uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The model incorporates a mid-market pricing convention (the mid‑point price between bid and ask prices) as a practical expedient for valuing its assets and liabilities measured and reported at fair value. The determination of the fair value for derivative contracts not only includes counterparty risk, but also the impact of Nevada Power's nonperformance risk on its liabilities, which as of September 30, 2017 and December 31, 2016, 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 7 for further discussion regarding Nevada Power's risk management and hedging activities.



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	(4	)	$	(22	)	$	(14	)	$	(22	)
Changes in fair value recognized in regulatory assets	(1		)	(1		)	(3		)	(6		)
Settlements	1			4			13			9
Ending balance	$	(4	)	$	(19	)	$	(4	)	$	(19	)



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	2,599	$	3,055	$	2,581	$	3,040

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

Accumulated Other Comprehensive Income (Loss) [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.

The following table presents Sierra Pacific's financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3		Total
As of September 30, 2017
Assets - investment funds	$	—	$	—	$	—	$	—

As of December 31, 2016
Assets:
Money market mutual funds⁽¹⁾	$	35	$	—	$	—	$	35
Investment funds	1		—		—		1
	$	36	$	—	$	—	$	36


(1)	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	1,120	$	1,201	$	1,119	$	1,191

- Definition

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, 2017
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Fuel, Capacity and Transmission Contract Commitments During the nine-month period ended September 30, 2017, MidAmerican Energy amended certain of its natural gas supply and transportation contracts increasing minimum payments by $247 million through 2021 and $70 million for 2022 through 2037. Construction Commitments During the nine-month period ended September 30, 2017, MidAmerican Energy entered into contracts totaling $675 million for the construction of wind-powered generating facilities in 2017 through 2019, with remaining payments totaling $84 million for the fourth quarter of 2017, $340 million in 2018 and $8 million in 2019. Operating Leases and Easements During the nine-month period ended September 30, 2017, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $114 million through 2057 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters The Company is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. The Company does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. The Company is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts and are described below. Environmental Laws and Regulations The Company is subject to federal, state, local and foreign laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact the Company's current and future operations. The Company believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the 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"). Congress failed to pass legislation needed to implement the original KHSA. On April 6, 2016, PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce and other stakeholders executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC") 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. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million, of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution towards facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees The Company has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on the Company's consolidated financial results.
PacifiCorp [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Legal Matters PacifiCorp is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. PacifiCorp does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Environmental Laws and Regulations PacifiCorp is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact PacifiCorp's current and future operations. PacifiCorp believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the Federal Energy Regulatory Commission ("FERC"). In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Congress failed to pass legislation needed to implement the original KHSA. On April 6, 2016, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce and other stakeholders executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC") 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. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million, of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees PacifiCorp has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on PacifiCorp's consolidated financial results.
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Natural Gas Commitments During the nine-month period ended September 30, 2017, MidAmerican Energy amended certain of its natural gas supply and transportation contracts increasing minimum payments by $247 million through 2021 and $70 million for 2022 through 2037. Construction Commitments During the nine-month period ended September 30, 2017, MidAmerican Energy entered into contracts totaling $675 million for the construction of wind-powered generating facilities in 2017 through 2019, with remaining payments totaling $84 million for the fourth quarter of 2017, $340 million in 2018 and $8 million in 2019. Easements During the nine-month period ended September 30, 2017, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $114 million through 2057 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters MidAmerican Energy is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Energy does not believe that such normal and routine litigation will have a material impact on its financial results. Environmental Laws and Regulations MidAmerican Energy is subject to federal, state and local laws and regulations regarding air and water quality, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact its current and future operations. MidAmerican Energy believes it is in material compliance with all applicable laws and regulations. Transmission Rates MidAmerican Energy's wholesale transmission rates are set annually using FERC-approved formula rates subject to true-up for actual cost of service. Prior to September 2016, the rates in effect were based on a 12.38% return on equity ("ROE"). In November 2013 and February 2015, a coalition of intervenors filed successive complaints with the FERC requesting that the 12.38% ROE no longer be found just and reasonable and sought to reduce the base ROE to 9.15% and 8.67%, respectively. MidAmerican Energy is authorized by the FERC to include a 0.50% adder beyond the base ROE effective January 2015. In September 2016, the FERC issued an order for the first complaint, which reduces the base ROE to 10.32% and requires refunds, plus interest, for the period from November 2013 through February 2015. Customer refunds relative to the first complaint occurred in February 2017. It is uncertain when the FERC will rule on the second complaint, covering the period from February 2015 through May 2016. MidAmerican Energy believes it is probable that the FERC will order a base ROE lower than 12.38% in the second complaint and, as of September 30, 2017, has accrued a $9 million liability for refunds under the second complaint of amounts collected under the higher ROE from February 2015 through May 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 8 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 facilities and other generating facilities. In May 2014, Nevada Power filed its ERCR Plan in compliance with SB 123. In July 2015, Nevada Power filed an amendment to its ERCR Plan with the PUCN which was approved in September 2015. In June 2015, the Nevada State Legislature passed Assembly Bill No. 498, which modified the capacity replacement components of SB 123. Consistent with the ERCR Plan, Nevada Power acquired a 272-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, contracted two renewable power purchase agreements with 100-MW solar photovoltaic generating facilities in 2015, contracted a renewable power purchase agreement with 100-MW solar photovoltaic generating facility in 2016 and acquired the remaining 130 MW, 25%, of the Silverhawk natural gas-fueled generating facility in April 2017, of which 54 MW were approved as part of the ERCR Plan. Nevada Power has the option to acquire 35 MW of nameplate renewable energy capacity in the future under the ERCR Plan, subject to PUCN approval. Nevada Power retired Reid Gardner Units 1, 2, and 3, 300 MW of coal-fueled generation, in 2014 and Reid Gardner Unit 4, 257 MW of coal-fueled generation, in March 2017. These transactions are related to Nevada Power's compliance 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.
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.

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Components of Accumulated Other Comprehensive Loss, Net

9 Months Ended

Sep. 30, 2017

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-		Gains (Losses)			Attributable
	Retirement			Translation			For-Sale		on Cash			To BHE
	Benefits			Adjustment			Securities		Flow Hedges			Shareholders, Net

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	)

Balance, December 31, 2016	$	(447	)	$	(1,675	)	$	585	$	26		$	(1,511	)
Other comprehensive income (loss)	16			535			542		(5		)	1,088
Balance, September 30, 2017	$	(431	)	$	(1,140	)	$	1,127	$	21		$	(423	)

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 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, 2015	$	(3	)	$	(27	)	$	(30	)
Other comprehensive income	2			—			2
Dividend	—			27			27
Balance at September 30, 2016	$	(1	)	$	—		$	(1	)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Components of Accumulated Other Comprehensive Income (Loss), Net

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

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Segment Information

9 Months Ended

Sep. 30, 2017

Segment Information



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017			2016
Operating revenue:
PacifiCorp	$	1,430	$	1,434	$	3,956		$	3,919
MidAmerican Funding	815		797		2,170			2,008
NV Energy	1,047		987		2,384			2,309
Northern Powergrid	221		220		685			748
BHE Pipeline Group	193		201		700			704
BHE Transmission	182		169		506			309
BHE Renewables	283		273		647			582
HomeServices	961		820		2,502			2,152
BHE and Other⁽¹⁾	151		191		453			523
Total operating revenue	$	5,283	$	5,092	$	14,003		$	13,254

Depreciation and amortization:
PacifiCorp	$	200	$	193	$	598		$	589
MidAmerican Funding	112		118		370			338
NV Energy	105		106		315			315
Northern Powergrid	55		49		156			149
BHE Pipeline Group	42		53		115			160
BHE Transmission	58		61		165			177
BHE Renewables	63		57		187			169
HomeServices	16		9		38			24
BHE and Other⁽¹⁾	—		2		(1		)	1
Total depreciation and amortization	$	651	$	648	$	1,943		$	1,922



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Operating income:
PacifiCorp	$	467		$	445		$	1,150		$	1,108
MidAmerican Funding	288			284			531			524
NV Energy	393			394			682			656
Northern Powergrid	81			90			308			373
BHE Pipeline Group	65			68			328			320
BHE Transmission	86			81			236			35
BHE Renewables	157			157			256			233
HomeServices	79			87			191			179
BHE and Other⁽¹⁾	8			(21		)	(38		)	(36		)
Total operating income	1,624			1,585			3,644			3,392
Interest expense	(464		)	(460		)	(1,379		)	(1,401		)
Capitalized interest	14			14			34			128
Allowance for equity funds	24			17			59			147
Interest and dividend income	32			39			85			93
Other, net	2			15			24			26
Total income before income tax expense and equity income	$	1,232		$	1,210		$	2,467		$	2,385



Interest expense:
PacifiCorp	$	95	$	95	$	285	$	286
MidAmerican Funding	59		55		177		164
NV Energy	57		60		173		190
Northern Powergrid	34		33		98		105
BHE Pipeline Group	11		13		33		39
BHE Transmission	45		40		125		114
BHE Renewables	51		51		153		148
HomeServices	1		1		3		2
BHE and Other⁽¹⁾	111		112		332		353
Total interest expense	$	464	$	460	$	1,379	$	1,401



Operating revenue by country:
United States	$	4,869	$	4,697	$	12,793	$	12,185
United Kingdom	221		220		685		748
Canada	182		170		506		313
Philippines and other	11		5		19		8
Total operating revenue by country	$	5,283	$	5,092	$	14,003	$	13,254



Income before income tax expense and equity income by country:
United States	$	1,113	$	1,089	$	2,065	$	1,945
United Kingdom	49		74		213		284
Canada	47		43		127		114
Philippines and other	23		4		62		42
Total income before income tax expense and equity income by country	$	1,232	$	1,210	$	2,467	$	2,385



	As of
	September 30,		December 31,
	2017		2016
Assets:
PacifiCorp	$	23,578	$	23,563
MidAmerican Funding	19,019		17,571
NV Energy	14,344		14,320
Northern Powergrid	7,280		6,433
BHE Pipeline Group	4,958		5,144
BHE Transmission	9,182		8,378
BHE Renewables	7,492		7,010
HomeServices	2,834		1,776
BHE and Other⁽¹⁾	2,367		1,245
Total assets	$	91,054	$	85,440


(1)	The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other, relate principally to other entities, corporate functions and intersegment eliminations.

The following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2017 (in millions):



									BHE Pipeline Group
			MidAmerican Funding		NV Energy		Northern Powergrid					BHE Transmission		BHE Renewables		HomeServices
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid					BHE Transmission		BHE Renewables		HomeServices		Total

December 31, 2016	$	1,129	$	2,102	$	2,369	$	930	$	75		$	1,470	$	95	$	840	$	9,010
Acquisitions	—		—		—		—		—			—		—		522		522
Foreign currency translation	—		—		—		56		—			114		—		—		170
Other	—		—		—		—		(2		)	—		—		—		(2		)
September 30, 2017	$	1,129	$	2,102	$	2,369	$	986	$	73		$	1,584	$	95	$	1,362	$	9,700

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,
	2017			2016			2017		2016
Operating revenue:
Regulated electric	$	707		$	692		$	1,677	$	1,572
Regulated gas	103			102			485		430
Other	3			1			4		2
Total operating revenue	$	813		$	795		$	2,166	$	2,004

Depreciation and amortization:
Regulated electric	$	101		$	107		$	338	$	306
Regulated gas	10			11			31		32
Total depreciation and amortization	$	111		$	118		$	369	$	338

Operating income:
Regulated electric	$	290		$	289		$	485	$	481
Regulated gas	(2		)	(5		)	45		42
Total operating income	$	288		$	284		$	530	$	523



	As of
	September 30, 2017		December 31, 2016
Assets:
Regulated electric	$	15,556	$	14,113
Regulated gas	1,339		1,345
Other	7		1
Total assets	$	16,902	$	15,459

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,
	2017			2016			2017		2016
Operating revenue:
Regulated electric	$	707		$	692		$	1,677	$	1,572
Regulated gas	103			102			485		430
Other	5			3			8		6
Total operating revenue	$	815		$	797		$	2,170	$	2,008

Depreciation and amortization:
Regulated electric	$	101		$	107		$	338	$	306
Regulated gas	10			11			31		32
Total depreciation and amortization	$	111		$	118		$	369	$	338

Operating income:
Regulated electric	$	290		$	289		$	485	$	481
Regulated gas	(2		)	(5		)	45		42
Other	—			—			1		1
Total operating income	$	288		$	284		$	531	$	524



	As of
	September 30, 2017		December 31, 2016
Assets⁽¹⁾:
Regulated electric	$	16,747	$	15,304
Regulated gas	1,418		1,424
Other	31		19
Total assets	$	18,196	$	16,747



(1)	Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.

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,
	2017		2016		2017		2016
Operating revenue:
Regulated electric	$	215	$	207	$	534	$	539
Regulated gas	15		15		66		81
Total operating revenue	$	230	$	222	$	600	$	620

Cost of sales:
Regulated electric	$	76	$	73	$	193	$	208
Regulated gas	4		5		26		42
Total cost of sales	$	80	$	78	$	219	$	250

Gross margin:
Regulated electric	$	139	$	134	$	341	$	331
Regulated gas	11		10		40		39
Total gross margin	$	150	$	144	$	381	$	370

Operating and maintenance:
Regulated electric	$	36	$	36	$	108	$	112
Regulated gas	4		4		13		14
Total operating and maintenance	$	40	$	40	$	121	$	126

Depreciation and amortization:
Regulated electric	$	25	$	26	$	74	$	76
Regulated gas	4		4		11		12
Total depreciation and amortization	$	29	$	30	$	85	$	88

Operating income:
Regulated electric	$	72	$	68	$	142	$	127
Regulated gas	3		1		15		11
Total operating income	$	75	$	69	$	157	$	138

Interest expense:
Regulated electric	$	10	$	11	$	30	$	38
Regulated gas	1		1		3		4
Total interest expense	$	11	$	12	$	33	$	42



	As of
	September 30,		December 31,
	2017		2016
Assets:
Regulated electric	$	3,165	$	3,119
Regulated gas	305		314
Regulated common assets⁽¹⁾	37		60
Total assets	$	3,507	$	3,493


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

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Related Party Transactions Related Party Transactions (Notes)	9 Months Ended
	Sep. 30, 2017
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 periods ended September 30, 2017 and 2016, PacifiCorp made net cash payments for federal and state income taxes to BHE totaling $205 million and $61 million, respectively.

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Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2017

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	2017			2016
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	73,138		$	71,536
Interstate natural gas pipeline assets	3-80 years	6,991			6,942
		80,129			78,478
Accumulated depreciation and amortization		(24,525		)	(23,603		)
Regulated assets, net		55,604			54,875

Nonregulated assets:
Independent power plants	5-30 years	5,911			5,594
Other assets	3-30 years	1,265			1,002
		7,176			6,596
Accumulated depreciation and amortization		(1,304		)	(1,060		)
Nonregulated assets, net		5,872			5,536

Net operating assets		61,476			60,411
Construction work-in-progress		3,503			2,098
Property, plant and equipment, net		$	64,979		$	62,509

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



		As of
		September 30,			December 31,
	Depreciable Life	2017			2016
Utility plant in service, net:
Generation	20-70 years	$	11,339		$	11,282
Transmission	52-75 years	1,802			1,726
Electric distribution	20-75 years	3,297			3,197
Gas distribution	29-75 years	1,606			1,565
Utility plant in service		18,044			17,770
Accumulated depreciation and amortization		(5,765		)	(5,448		)
Utility plant in service, net		12,279			12,322
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		12,285			12,328
Construction work-in-progress		1,302			493
Property, plant and equipment, net		$	13,587		$	12,821

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



		As of
		September 30,			December 31,
	Depreciable Life	2017			2016

Property, plant and equipment in-service	5-75 years	$	27,599		$	27,298
Accumulated depreciation and amortization		(9,222		)	(8,793		)
Net property, plant and equipment in-service		18,377			18,505
Construction work-in-progress		758			657
Total property, plant and equipment, net		$	19,135		$	19,162

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2017			2016
Utility plant:
Generation	30 - 55 years	$	3,725		$	4,271
Distribution	20 - 65 years	3,294			3,231
Transmission	45 - 65 years	1,860			1,846
General and intangible plant	5 - 65 years	784			738
Utility plant		9,663			10,086
Accumulated depreciation and amortization		(2,840		)	(3,205		)
Utility plant, net		6,823			6,881
Other non-regulated, net of accumulated depreciation and amortization	45 years	2			2
Plant, net		6,825			6,883
Construction work-in-progress		65			114
Property, plant and equipment, net		$	6,890		$	6,997

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	2017			2016
Utility plant:
Electric generation	25 - 60 years	$	1,140		$	1,137
Electric distribution	20 - 100 years	1,445			1,417
Electric transmission	50 - 100 years	782			771
Electric general and intangible plant	5 - 70 years	182			164
Natural gas distribution	35 - 70 years	388			381
Natural gas general and intangible plant	5 - 70 years	14			15
Common general	5 - 70 years	290			267
Utility plant		4,241			4,152
Accumulated depreciation and amortization		(1,496		)	(1,442		)
Utility plant, net		2,745			2,710
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,750			2,715
Construction work-in-progress		112			107
Property, plant and equipment, net		$	2,862		$	2,822

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Investments and Restricted Cash and Investments (Tables)

9 Months Ended

Sep. 30, 2017

Investments and Restricted Cash and Investments

Investments and restricted cash and investments consists of the following (in millions):



	As of
	September 30,		December 31,
	2017		2016
Investments:
BYD Company Limited common stock	$	2,087	$	1,185
Rabbi trusts	431		403
Other	132		106
Total investments	2,650		1,694

Equity method investments:
BHE Renewables tax equity investments	804		741
Electric Transmission Texas, LLC	693		672
Bridger Coal Company	140		165
Other	158		142
Total equity method investments	1,795		1,720

Restricted cash and investments:
Quad Cities Station nuclear decommissioning trust funds	498		460
Other	317		282
Total restricted cash and investments	815		742

Total investments and restricted cash and investments	$	5,260	$	4,156

Reflected as:
Other current assets	$	273	$	211
Noncurrent assets	4,987		3,945
Total investments and restricted cash and investments	$	5,260	$	4,156

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(19	)	(16	)	(18	)	(15	)
State income tax, net of federal income tax benefit	—		—		(1	)	—
Income tax effect of foreign income	(3	)	(3	)	(4	)	(4	)
Equity income	1		1		1		1
Other, net	1		(1	)	—		—
Effective income tax rate	15	%	16	%	13	%	17	%

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 is as follows:



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(74	)	(58	)	(74	)	(58	)
State income tax, net of federal income tax benefit	(10	)	(6	)	(7	)	(4	)
Effects of ratemaking	(2	)	(1	)	(4	)	(3	)
Other, net	(1	)	—		—		—
Effective income tax rate	(52	)%	(30	)%	(50	)%	(30	)%

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 is as follows:



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017		2016

Federal statutory income tax rate	35	%	35	%	35	%	35	%
Income tax credits	(76	)	(60	)	(76	)	(61	)
State income tax, net of federal income tax benefit	(10	)	(7	)	(8	)	(4	)
Effects of ratemaking	(2	)	—		(4	)	(3	)
Effective income tax rate	(53	)%	(32	)%	(53	)%	(33	)%

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017			2016			2017			2016

Service cost	$	6		$	5		$	19		$	16
Interest cost	15			17			44			55
Expected return on plan assets	(25		)	(27		)	(74		)	(85		)
Settlement	18			—			18			—
Net amortization	17			11			50			34
Net periodic benefit cost	$	31		$	6		$	57		$	20

Domestic Operations

Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions):



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Pension:
Service cost	$	6		$	7		$	18		$	22
Interest cost	29			31			87			94
Expected return on plan assets	(40		)	(39		)	(120		)	(120		)
Net amortization	7			12			22			36
Net periodic benefit cost	$	2		$	11		$	7		$	32

Other postretirement:
Service cost	$	3		$	2		$	7		$	7
Interest cost	7			7			21			23
Expected return on plan assets	(9		)	(10		)	(30		)	(31		)
Net amortization	(3		)	(2		)	(10		)	(9		)
Net periodic benefit credit	$	(2	)	$	(3	)	$	(12	)	$	(10	)

Schedule of Defined Benefit Plans Disclosures

Net periodic benefit (credit) cost for the pension and other postretirement benefit plans included the following components (in millions):



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Pension:
Service cost	$	—		$	1		$	—		$	3
Interest cost	12			14			37			41
Expected return on plan assets	(18		)	(18		)	(54		)	(56		)
Net amortization	3			8			10			25
Net periodic benefit (credit) cost	$	(3	)	$	5		$	(7	)	$	13

Other postretirement:
Service cost	$	1		$	1		$	2		$	2
Interest cost	3			3			10			11
Expected return on plan assets	(5		)	(5		)	(16		)	(16		)
Net amortization	(1		)	(1		)	(4		)	(4		)
Net periodic benefit credit	$	(2	)	$	(2	)	$	(8	)	$	(7	)

Schedule of Defined Benefit Plans Disclosures

Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Pension:
Service cost	$	2		$	3		$	7		$	8
Interest cost	8			8			23			25
Expected return on plan assets	(11		)	(11		)	(33		)	(33		)
Net amortization	—			—			1			1
Net periodic benefit (credit) cost	$	(1	)	$	—		$	(2	)	$	1

Other postretirement:
Service cost	$	2		$	1		$	4		$	4
Interest cost	3			2			7			7
Expected return on plan assets	(3		)	(3		)	(10		)	(10		)
Net amortization	(1		)	(1		)	(3		)	(3		)
Net periodic benefit cost (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,
	2017			2016
Qualified Pension Plan -
Other long-term liabilities	$	(27	)	$	(24	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(9		)	(9		)

Other Postretirement Plans -
Other long-term liabilities	(4		)	(4		)

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,
	2017			2016
Qualified Pension Plan -
Other long-term liabilities	$	(13	)	$	(12	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(9		)	(9		)

Other Postretirement Plans -
Other long-term liabilities	(25		)	(28		)

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Risk Management and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017
Not designated as hedging contracts:
Commodity assets⁽¹⁾	$	16		$	93	$	7		$	3		$	119
Commodity liabilities⁽¹⁾	(1		)	—		(60		)	(135		)	(196		)
Interest rate assets	22			—		—			—			22
Interest rate liabilities	—			—		(3		)	(7		)	(10		)
Total	37			93		(56		)	(139		)	(65		)

Designated as hedging contracts:
Commodity assets	—			—		2			6			8
Commodity liabilities	—			—		(11		)	(17		)	(28		)
Interest rate assets	—			6		—			—			6
Interest rate liabilities	—			—		(1		)	—			(1		)
Total	—			6		(10		)	(11		)	(15		)

Total derivatives	37			99		(66		)	(150		)	(80		)
Cash collateral receivable	—			—		21			64			85
Total derivatives - net basis	$	37		$	99	$	(45	)	$	(86	)	$	5



	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of December 31, 2016
Not designated as hedging contracts:
Commodity assets⁽¹⁾	$	42		$	86	$	5		$	2		$	135
Commodity liabilities⁽¹⁾	(10		)	—		(46		)	(150		)	(206		)
Interest rate assets	15			—		—			—			15
Interest rate liabilities	—			—		(4		)	(6		)	(10		)
Total	47			86		(45		)	(154		)	(66		)

Designated as hedging contracts:
Commodity assets	1			—		2			3			6
Commodity liabilities	—			—		(14		)	(8		)	(22		)
Interest rate assets	—			8		—			—			8
Interest rate liabilities	—			—		(3		)	—			(3		)
Total	1			8		(15		)	(5		)	(11		)

Total derivatives	48			94		(60		)	(159		)	(77		)
Cash collateral receivable	—			—		13			61			74
Total derivatives - net basis	$	48		$	94	$	(47	)	$	(98	)	$	(3	)

(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,
	2017			2016			2017			2016

Beginning balance	$	162		$	185		$	148		$	250
Changes in fair value recognized in net regulatory assets	10			18			43			5
Net (losses) gains reclassified to operating revenue	(5		)	(3		)	9			(6		)
Net losses reclassified to cost of sales	(5		)	(5		)	(38		)	(54		)
Ending balance	$	162		$	195		$	162		$	195

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 OCI, as well as amounts reclassified to earnings (in millions):



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	21		$	26		$	16		$	46
Changes in fair value recognized in OCI	5			15			28			35
Net gains reclassified to operating revenue	—			1			—			1
Net losses reclassified to cost of sales	(7		)	(7		)	(25		)	(47		)
Ending balance	$	19		$	35		$	19		$	35

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	2017		2016

Electricity purchases	Megawatt hours	9		5
Natural gas purchases	Decatherms	339		271
Fuel purchases	Gallons	2		11
Interest rate swaps	US$	694		714
Interest rate swaps	£	102		—
Mortgage sale commitments, net	US$	(442	)	(309	)

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, 2017
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	4		$	1	$	2		$	—		$	7
Commodity liabilities	(1		)	—		(24		)	(82		)	(107		)
Total	3			1		(22		)	(82		)	(100		)

Total derivatives	3			1		(22		)	(82		)	(100		)
Cash collateral receivable	—			—		16			57			73
Total derivatives - net basis	$	3		$	1	$	(6	)	$	(25	)	$	(27	)

As of December 31, 2016
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	24		$	2	$	1		$	—		$	27
Commodity liabilities	(6		)	—		(14		)	(84		)	(104		)
Total	18			2		(13		)	(84		)	(77		)

Total derivatives	18			2		(13		)	(84		)	(77		)
Cash collateral receivable	—			—		10			59			69
Total derivatives - net basis	$	18		$	2	$	(3	)	$	(25	)	$	(8	)


(1)	PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $97 million and $73 million, respectively, was recorded related to the net derivative liability of $100 million and $77 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,
	2017			2016			2017			2016

Beginning balance	$	95		$	89		$	73		$	133
Changes in fair value recognized in net regulatory assets	6			15			36			(4		)
Net (losses) gains reclassified to operating revenue	(5		)	(2		)	8			8
Net gains (losses) reclassified to energy costs	1			—			(20		)	(35		)
Ending balance	$	97		$	102		$	97		$	102

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	2017		2016

Electricity sales	Megawatt hours	(3	)	(3	)
Natural gas purchases	Decatherms	97		84
Fuel oil purchases	Gallons	2		11

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



	Other			Other
	Current			Long-term
	Liabilities			Liabilities			Total
As of September 30, 2017
Commodity liabilities⁽¹⁾	$	(3	)	$	(1	)	$	(4	)

As of December 31, 2016
Commodity liabilities⁽¹⁾	$	(7	)	$	(7	)	$	(14	)


(1)	Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 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 (in millions):



		As of
	Unit of	September 30,	December 31,
	Measure	2017	2016

Electricity sales	Megawatt hours	—	(2	)
Natural gas purchases	Decatherms	149	114

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents the Company's financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of September 30, 2017
Assets:
Commodity derivatives	$	1		$	24		$	102		$	(19	)	$	108
Interest rate derivatives	—			14			14			—			28
Mortgage loans held for sale	—			534			—			—			534
Money market mutual funds⁽²⁾	855			—			—			—			855
Debt securities:
United States government obligations	168			—			—			—			168
International government obligations	—			5			—			—			5
Corporate obligations	—			37			—			—			37
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			1			—			—			1
Equity securities:
United States companies	270			—			—			—			270
International companies	2,094			—			—			—			2,094
Investment funds	182			—			—			—			182
	$	3,570		$	617		$	116		$	(19	)	$	4,284
Liabilities:
Commodity derivatives	$	(1	)	$	(207	)	$	(16	)	$	104		$	(120	)
Interest rate derivatives	—			(10		)	(1		)	—			(11		)
	$	(1	)	$	(217	)	$	(17	)	$	104		$	(131	)



As of December 31, 2016
Assets:
Commodity derivatives	$	5		$	49		$	87		$	(22	)	$	119
Interest rate derivatives	—			16			7			—			23
Mortgage loans held for sale	—			359			—			—			359
Money market mutual funds⁽²⁾	586			—			—			—			586
Debt securities:
United States government obligations	161			—			—			—			161
International government obligations	—			3			—			—			3
Corporate obligations	—			36			—			—			36
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			2			—			—			2
Equity securities:
United States companies	250			—			—			—			250
International companies	1,190			—			—			—			1,190
Investment funds	147			—			—			—			147
	$	2,339		$	467		$	94		$	(22	)	$	2,878
Liabilities:
Commodity derivatives	$	(2	)	$	(199	)	$	(27	)	$	96		$	(132	)
Interest rate derivatives	(1		)	(11		)	(1		)	—			(13		)
	$	(3	)	$	(210	)	$	(28	)	$	96		$	(145	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $74 million as of September 30, 2017 and December 31, 2016, 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
2017:
Beginning balance	$	81		$	8		$	—	$	60		$	6		$	—
Changes included in earnings	7			34			—		19			100			—
Changes in fair value recognized in OCI	(1		)	—			—		(3		)	—			—
Changes in fair value recognized in net regulatory assets	(3		)	—			—		(5		)	—			—
Purchases	—			8			—		1			6			—
Settlements	2			(37		)	—		14			(99		)	—
Ending balance	$	86		$	13		$	—	$	86		$	13		$	—



	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

The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions):



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	36,124	$	41,197	$	36,116	$	40,718

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents PacifiCorp's financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3		Other⁽¹⁾			Total
As of September 30, 2017
Assets:
Commodity derivatives	$	—	$	7		$	—	$	(3	)	$	4
Money market mutual funds⁽²⁾	100		—			—		—			100
Investment funds	20		—			—		—			20
	$	120	$	7		$	—	$	(3	)	$	124

Liabilities - Commodity derivatives	$	—	$	(107	)	$	—	$	76		$	(31	)

As of December 31, 2016
Assets:
Commodity derivatives	$	—	$	27		$	—	$	(7	)	$	20
Money market mutual funds⁽²⁾	13		—			—		—			13
Investment funds	17		—			—		—			17
	$	30	$	27		$	—	$	(7	)	$	50

Liabilities - Commodity derivatives	$	—	$	(104	)	$	—	$	76		$	(28	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $73 million and $69 million as of September 30, 2017 and December 31, 2016, 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.



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	7,005	$	8,277	$	7,052	$	8,204

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents MidAmerican Energy's financial assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of September 30, 2017:
Assets:
Commodity derivatives	$	—	$	2		$	2		$	(2	)	$	2
Money market mutual funds⁽²⁾	520		—			—			—			520
Debt securities:
United States government obligations	168		—			—			—			168
International government obligations	—		5			—			—			5
Corporate obligations	—		37			—			—			37
Municipal obligations	—		2			—			—			2
Agency, asset and mortgage-backed obligations	—		1			—			—			1
Equity securities:
United States companies	270		—			—			—			270
International companies	7		—			—			—			7
Investment funds	15		—			—			—			15
	$	980	$	47		$	2		$	(2	)	$	1,027

Liabilities - commodity derivatives	$	—	$	(6	)	$	(4	)	$	2		$	(8	)



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2016:
Assets:
Commodity derivatives	$	—	$	9		$	1		$	(2	)	$	8
Money market mutual funds⁽²⁾	1		—			—			—			1
Debt securities:
United States government obligations	161		—			—			—			161
International government obligations	—		3			—			—			3
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Agency, asset and mortgage-backed obligations	—		2			—			—			2
Equity securities:
United States companies	250		—			—			—			250
International companies	5		—			—			—			5
Investment funds	9		—			—			—			9
	$	426	$	52		$	1		$	(2	)	$	477

Liabilities - commodity derivatives	$	—	$	(3	)	$	(3	)	$	3		$	(3	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016, 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
2017:
Beginning balance	$	(1	)	$	—	$	(2	)	$	—
Changes in fair value recognized in net regulatory assets	(2		)	—		(2		)	—
Settlements	1			—		2			—
Ending balance	$	(2	)	$	—	$	(2	)	$	—

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



	As of September 30, 2017				As of December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	4,894	$	5,446	$	4,301	$	4,735

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, 2017				As of December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,220	$	5,873	$	4,627	$	5,164

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 financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of September 30, 2017
Assets - investment funds	$	2	$	—	$	—		$	2

Liabilities - commodity derivatives	$	—	$	—	$	(4	)	$	(4	)

As of December 31, 2016
Assets:
Money market mutual funds⁽¹⁾	$	220	$	—	$	—		$	220
Investment funds	6		—		—			6
	$	226	$	—	$	—		$	226

Liabilities - commodity derivatives	$	—	$	—	$	(14	)	$	(14	)


(1)	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016

Beginning balance	$	(4	)	$	(22	)	$	(14	)	$	(22	)
Changes in fair value recognized in regulatory assets	(1		)	(1		)	(3		)	(6		)
Settlements	1			4			13			9
Ending balance	$	(4	)	$	(19	)	$	(4	)	$	(19	)

The following table presents the carrying value and estimated fair value of Nevada Power's long‑term debt (in millions):



	As of September 30, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	2,599	$	3,055	$	2,581	$	3,040

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents Sierra Pacific's financial assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3		Total
As of September 30, 2017
Assets - investment funds	$	—	$	—	$	—	$	—

As of December 31, 2016
Assets:
Money market mutual funds⁽¹⁾	$	35	$	—	$	—	$	35
Investment funds	1		—		—		1
	$	36	$	—	$	—	$	36


(1)	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

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, 2017				As of December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	1,120	$	1,201	$	1,119	$	1,191

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Components of Accumulated Other Comprehensive Loss, Net (Tables)

9 Months Ended

Sep. 30, 2017

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-		Gains (Losses)			Attributable
	Retirement			Translation			For-Sale		on Cash			To BHE
	Benefits			Adjustment			Securities		Flow Hedges			Shareholders, Net

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	)

Balance, December 31, 2016	$	(447	)	$	(1,675	)	$	585	$	26		$	(1,511	)
Other comprehensive income (loss)	16			535			542		(5		)	1,088
Balance, September 30, 2017	$	(431	)	$	(1,140	)	$	1,127	$	21		$	(423	)

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 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, 2015	$	(3	)	$	(27	)	$	(30	)
Other comprehensive income	2			—			2
Dividend	—			27			27
Balance at September 30, 2016	$	(1	)	$	—		$	(1	)

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Segment Reporting Information, by Segment



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2017		2016		2017			2016
Operating revenue:
PacifiCorp	$	1,430	$	1,434	$	3,956		$	3,919
MidAmerican Funding	815		797		2,170			2,008
NV Energy	1,047		987		2,384			2,309
Northern Powergrid	221		220		685			748
BHE Pipeline Group	193		201		700			704
BHE Transmission	182		169		506			309
BHE Renewables	283		273		647			582
HomeServices	961		820		2,502			2,152
BHE and Other⁽¹⁾	151		191		453			523
Total operating revenue	$	5,283	$	5,092	$	14,003		$	13,254

Depreciation and amortization:
PacifiCorp	$	200	$	193	$	598		$	589
MidAmerican Funding	112		118		370			338
NV Energy	105		106		315			315
Northern Powergrid	55		49		156			149
BHE Pipeline Group	42		53		115			160
BHE Transmission	58		61		165			177
BHE Renewables	63		57		187			169
HomeServices	16		9		38			24
BHE and Other⁽¹⁾	—		2		(1		)	1
Total depreciation and amortization	$	651	$	648	$	1,943		$	1,922



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2017			2016			2017			2016
Operating income:
PacifiCorp	$	467		$	445		$	1,150		$	1,108
MidAmerican Funding	288			284			531			524
NV Energy	393			394			682			656
Northern Powergrid	81			90			308			373
BHE Pipeline Group	65			68			328			320
BHE Transmission	86			81			236			35
BHE Renewables	157			157			256			233
HomeServices	79			87			191			179
BHE and Other⁽¹⁾	8			(21		)	(38		)	(36		)
Total operating income	1,624			1,585			3,644			3,392
Interest expense	(464		)	(460		)	(1,379		)	(1,401		)
Capitalized interest	14			14			34			128
Allowance for equity funds	24			17			59			147
Interest and dividend income	32			39			85			93
Other, net	2			15			24			26
Total income before income tax expense and equity income	$	1,232		$	1,210		$	2,467		$	2,385



Interest expense:
PacifiCorp	$	95	$	95	$	285	$	286
MidAmerican Funding	59		55		177		164
NV Energy	57		60		173		190
Northern Powergrid	34		33		98		105
BHE Pipeline Group	11		13		33		39
BHE Transmission	45		40		125		114
BHE Renewables	51		51		153		148
HomeServices	1		1		3		2
BHE and Other⁽¹⁾	111		112		332		353
Total interest expense	$	464	$	460	$	1,379	$	1,401



Operating revenue by country:
United States	$	4,869	$	4,697	$	12,793	$	12,185
United Kingdom	221		220		685		748
Canada	182		170		506		313
Philippines and other	11		5		19		8
Total operating revenue by country	$	5,283	$	5,092	$	14,003	$	13,254



Income before income tax expense and equity income by country:
United States	$	1,113	$	1,089	$	2,065	$	1,945
United Kingdom	49		74		213		284
Canada	47		43		127		114
Philippines and other	23		4		62		42
Total income before income tax expense and equity income by country	$	1,232	$	1,210	$	2,467	$	2,385



	As of
	September 30,		December 31,
	2017		2016
Assets:
PacifiCorp	$	23,578	$	23,563
MidAmerican Funding	19,019		17,571
NV Energy	14,344		14,320
Northern Powergrid	7,280		6,433
BHE Pipeline Group	4,958		5,144
BHE Transmission	9,182		8,378
BHE Renewables	7,492		7,010
HomeServices	2,834		1,776
BHE and Other⁽¹⁾	2,367		1,245
Total assets	$	91,054	$	85,440


(1)	The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other, relate principally to other entities, corporate functions and intersegment eliminations.

Schedule of Goodwill

e following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2017 (in millions):



									BHE Pipeline Group
			MidAmerican Funding		NV Energy		Northern Powergrid					BHE Transmission		BHE Renewables		HomeServices
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid					BHE Transmission		BHE Renewables		HomeServices		Total

December 31, 2016	$	1,129	$	2,102	$	2,369	$	930	$	75		$	1,470	$	95	$	840	$	9,010
Acquisitions	—		—		—		—		—			—		—		522		522
Foreign currency translation	—		—		—		56		—			114		—		—		170
Other	—		—		—		—		(2		)	—		—		—		(2		)
September 30, 2017	$	1,129	$	2,102	$	2,369	$	986	$	73		$	1,584	$	95	$	1,362	$	9,700

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,
	2017			2016			2017		2016
Operating revenue:
Regulated electric	$	707		$	692		$	1,677	$	1,572
Regulated gas	103			102			485		430
Other	3			1			4		2
Total operating revenue	$	813		$	795		$	2,166	$	2,004

Depreciation and amortization:
Regulated electric	$	101		$	107		$	338	$	306
Regulated gas	10			11			31		32
Total depreciation and amortization	$	111		$	118		$	369	$	338

Operating income:
Regulated electric	$	290		$	289		$	485	$	481
Regulated gas	(2		)	(5		)	45		42
Total operating income	$	288		$	284		$	530	$	523



	As of
	September 30, 2017		December 31, 2016
Assets:
Regulated electric	$	15,556	$	14,113
Regulated gas	1,339		1,345
Other	7		1
Total assets	$	16,902	$	15,459

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,
	2017			2016			2017		2016
Operating revenue:
Regulated electric	$	707		$	692		$	1,677	$	1,572
Regulated gas	103			102			485		430
Other	5			3			8		6
Total operating revenue	$	815		$	797		$	2,170	$	2,008

Depreciation and amortization:
Regulated electric	$	101		$	107		$	338	$	306
Regulated gas	10			11			31		32
Total depreciation and amortization	$	111		$	118		$	369	$	338

Operating income:
Regulated electric	$	290		$	289		$	485	$	481
Regulated gas	(2		)	(5		)	45		42
Other	—			—			1		1
Total operating income	$	288		$	284		$	531	$	524



	As of
	September 30, 2017		December 31, 2016
Assets⁽¹⁾:
Regulated electric	$	16,747	$	15,304
Regulated gas	1,418		1,424
Other	31		19
Total assets	$	18,196	$	16,747



(1)	Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.

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,
	2017		2016		2017		2016
Operating revenue:
Regulated electric	$	215	$	207	$	534	$	539
Regulated gas	15		15		66		81
Total operating revenue	$	230	$	222	$	600	$	620

Cost of sales:
Regulated electric	$	76	$	73	$	193	$	208
Regulated gas	4		5		26		42
Total cost of sales	$	80	$	78	$	219	$	250

Gross margin:
Regulated electric	$	139	$	134	$	341	$	331
Regulated gas	11		10		40		39
Total gross margin	$	150	$	144	$	381	$	370

Operating and maintenance:
Regulated electric	$	36	$	36	$	108	$	112
Regulated gas	4		4		13		14
Total operating and maintenance	$	40	$	40	$	121	$	126

Depreciation and amortization:
Regulated electric	$	25	$	26	$	74	$	76
Regulated gas	4		4		11		12
Total depreciation and amortization	$	29	$	30	$	85	$	88

Operating income:
Regulated electric	$	72	$	68	$	142	$	127
Regulated gas	3		1		15		11
Total operating income	$	75	$	69	$	157	$	138

Interest expense:
Regulated electric	$	10	$	11	$	30	$	38
Regulated gas	1		1		3		4
Total interest expense	$	11	$	12	$	33	$	42



	As of
	September 30,		December 31,
	2017		2016
Assets:
Regulated electric	$	3,165	$	3,119
Regulated gas	305		314
Regulated common assets⁽¹⁾	37		60
Total assets	$	3,507	$	3,493


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

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General (Details)	9 Months Ended
General (Details)	Sep. 30, 2017 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

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New Accounting Pronouncements New Accounting Pronouncements (Details) - BHE (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 542	$ 151

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Business Acquisitions (Details) - USD ($) $ in Millions	9 Months Ended
Business Acquisitions (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,102	$ 66
Goodwill	9,700		$ 9,010
Other acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	476
Goodwill	$ 522

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Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 61,476	$ 60,411
Construction in Progress, Gross	3,503	2,098
Property, plant and equipment, net	64,979	62,509
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	80,129	78,478
Accumulated depreciation and amortization	(24,525)	(23,603)
Property, plant and equipment in service, net	55,604	54,875
Construction in Progress, Gross	3,100	1,800
Regulated assets [Member] \| Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 73,138	71,536
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	$ 6,991	6,942
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 asset [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,176	6,596
Accumulated depreciation and amortization	(1,304)	(1,060)
Property, plant and equipment in service, net	5,872	5,536
Unregulated asset [Member] \| Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,911	5,594
Unregulated asset [Member] \| Independent power plants \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Unregulated asset [Member] \| Independent power plants \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Unregulated asset [Member] \| Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,265	$ 1,002
Unregulated asset [Member] \| Other assets \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Unregulated asset [Member] \| Other assets \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years

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Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 27,599	$ 27,298
Public utility accumulated depreciation and amortization	(9,222)	(8,793)
Public Utilities Property, Plant And Equipment In Service, Net	18,377	18,505
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	758	657
Public Utilities, Property, Plant and Equipment, Net	$ 19,135	$ 19,162
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	75 years

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Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 12,285	$ 12,285	$ 12,328
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,302	1,302	493
Public Utilities, Property, Plant and Equipment, Net	13,587	13,587	12,821
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	18,044	18,044	17,770
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,765)	(5,765)	(5,448)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	12,279	12,279	12,322
Regulated assets [Member] \| Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods		34
Change in Accounting Estimates, Impact on Current Period From Prior Year Change	9	26
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(1)	(1)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	6	6
Gross public utility property, plant and equipment in service	7	7	7
Electric Operations [Member] \| Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	11,339	11,339	11,282
Public Utilities, Property, Plant and Equipment, Transmission	1,802	1,802	1,726
Public Utilities, Property, Plant and Equipment, Distribution	3,297	3,297	3,197
Natural Gas Processing Plant [Member] \| Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,606	$ 1,606	$ 1,565

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Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	$ 3,503	$ 2,098
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	25	22
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(10)	(9)
Construction in Progress, Gross	$ 0	$ 1

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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, 2017	Dec. 31, 2016	Apr. 30, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,825	$ 6,883
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	65	114
Public Utilities, Property, Plant and Equipment, Net	6,890	6,997
130 Megawatts of Natural Gas Energy [Member]
Property, Plant and Equipment [Line Items]
Ownership Percentage Acquired			25.00%
Business Acquisition, Transaction Costs			$ 77
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,725	4,271
Public Utilities, Property, Plant and Equipment, Distribution	3,294	3,231
Public Utilities, Property, Plant and Equipment, Transmission	1,860	1,846
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	784	738
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,663	10,086
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,840	3,205
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,823	$ 6,881
Regulated assets [Member] \| Minimum [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
Regulated assets [Member] \| Maximum [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
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2	$ 2
Unregulated asset [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years
Unregulated asset [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years

XML 104 R68.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, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,750	$ 2,715
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	112	107
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Regulated assets [Member] \| Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,140	1,137
Public Utilities, Property, Plant and Equipment, Distribution	1,445	1,417
Public Utilities, Property, Plant and Equipment, Transmission	782	771
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 182	$ 164
Regulated assets [Member] \| Electricity Generation Plant, Non-Nuclear [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	25 years	25 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated assets [Member] \| Electricity Generation Plant, Non-Nuclear [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Regulated assets [Member] \| Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 388	$ 381
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 14	$ 15
Regulated assets [Member] \| Natural Gas Processing Plant [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	35 years	35 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated assets [Member] \| Natural Gas Processing Plant [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Regulated assets [Member] \| Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	$ 290	$ 267
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,241	4,152
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,496	1,442
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,745	$ 2,710
Regulated assets [Member] \| Common Facilities [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years	5 years
Regulated assets [Member] \| Common Facilities [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	70 years	70 years
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 5	$ 5
Unregulated asset [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Unregulated asset [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods			$ 9
Change in Accounting Estimate, Amount Deferred to Future Periods		$ 7

XML 105 R69.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - NPC (Details) $ in Millions	1 Months Ended
	May 31, 2017 USD ($)	Mar. 31, 2017 USD ($) MW	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory assets				$ 4,582	$ 4,307
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory assets				$ 1,110	$ 1,000
Nevada Power Company [Member] \| 257 Megawatts of Coal Energy [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Coal-Fired Power Plant Capacity \| MW		257
Regulatory assets		$ 151
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| MGM Resorts International [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee			$ 82
Impact Fee Credit	$ 16
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Wynn Las Vegas, LLC [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee			$ 15
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Switch, Ltd. [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee	$ 27

XML 106 R70.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - SPPC (Details) - Sierra Pacific Power Company [Member] - General Rate Case [Member] - Public Utilities Commission, Nevada [Member]	12 Months Ended
	Dec. 31, 2016 USD ($) MW
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 0
Net Metering Capacity \| MW	6
Electric Distribution [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 3,000,000
Gas Distribution [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 2,000,000

XML 107 R71.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Investments	$ 2,650	$ 1,694
Equity Method Investments [Abstract]
Equity method investments	1,795	1,720
Restricted Cash and Investments [Abstract]
Restricted cash and investments	815	742
Investments, including equity method investments and restricted cash and investments	5,260	4,156
Investments, including equity method investments and restricted cash and investments, current	273	211
Investments, including equity method investments and restricted cash and investments, noncurrent	4,987	3,945
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	498	460
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	317	282
Equity Method Investments, tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	804	741
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	693	672
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	140	165
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	158	142
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	2,087	1,185
Available-for-sale securities, gross unrealized gain (loss)	1,855	953
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	431	403
Other investments [Member]
Investments [Abstract]
Other investments	$ 132	$ 106

XML 108 R72.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) £ in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2017 GBP (£)	Jun. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2017 GBP (£)	May 31, 2017 USD ($)	Apr. 01, 2017 USD ($)	Feb. 28, 2017 USD ($)
Northern Powergrid Holdings [Member] \| Secured amortizing corporate facility, due June 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount \| £					£ 200
Proceeds from Issuance of Debt \| £	£ 120
Percent of interest rate swaps that fix the underlying interest rate on outstanding debt				85.00%	85.00%
BHE [Member] \| BHE Junior Subordinated Debentures, due 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 944
BHE [Member] \| BHE Junior Subordinated Debentures, due June 2057 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 100
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Conversion of Stock, Shares Converted \| shares		181,819
HomeServices [Member] \| Unsecured amortizing term loan, $250 million, due September 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 250
Alamo 6, LLC [Member] \| Alamo 6, LLC Senior Secured Notes, 4.17%, due March 2018 through March 2042 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount						$ 232
Debt Instrument, Interest Rate, Stated Percentage						4.17%
MidAmerican Energy Company and Subsidiaries [Member] \| MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 375
Debt Instrument, Interest Rate, Stated Percentage								3.10%
MidAmerican Energy Company and Subsidiaries [Member] \| MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 475
Debt Instrument, Interest Rate, Stated Percentage								3.95%
MidAmerican Energy Company and Subsidiaries [Member] \| MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								5.95%
Debt Instrument, Repurchased Face Amount								$ 250
Subsidiary Debt [Member] \| Cordova Funding Corporation [Member] \| Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount				$ 89
Subsidiary Debt [Member] \| CE Generation, LLC [Member] \| CE Generation Bonds 7.416% due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.416%	7.416%
Debt Instrument, Repurchased Face Amount				$ 51
Subsidiary Debt [Member] \| Salton Sea Funding Corporation [Member] \| Salton Sea Funding Corporation Bonds 7.475% due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.475%	7.475%
Debt Instrument, Repurchased Face Amount				$ 20
Subsidiary Debt [Member] \| Kern River [Member] \| Kern River Senior Notes, 4.893%, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							4.893%
Debt Instrument, Repurchased Face Amount							$ 175
Subsidiary Debt [Member] \| Minimum [Member] \| Cordova Funding Corporation [Member] \| Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				8.48%	8.48%
Subsidiary Debt [Member] \| Maximum [Member] \| Cordova Funding Corporation [Member] \| Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				9.07%	9.07%
Subsidiary Debt [Member] \| MidAmerican Funding [Member] \| MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 375
Debt Instrument, Interest Rate, Stated Percentage								3.10%
Subsidiary Debt [Member] \| MidAmerican Funding [Member] \| MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 475
Debt Instrument, Interest Rate, Stated Percentage								3.95%
Subsidiary Debt [Member] \| MidAmerican Funding [Member] \| MidAmerican Energy Company [Member] \| MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								5.95%

XML 109 R73.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Line of Credit [Member] $ in Millions	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)
HomeServices [Member] \| Unsecured credit facility, $350 million, expiring July 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 350
HomeServices [Member] \| Unsecured credit facility, $600 million, expiring September 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
Sierra Pacific Power Company [Member] \| Secured credit facility, $250 million, expiring June 2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
MidAmerican Energy Company [Member] \| Unsecured credit facility, $600 million, expiring March 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
MidAmerican Energy Company [Member] \| Unsecured credit facility, $900 million, expiring March 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900	900
BHE [Member] \| Unsecured credit facility, $2 billion, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 2,000
BHE [Member] \| Unsecured credit facility, $1 billion, expiring May 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
PacifiCorp [Member] \| Unsecured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
PacifiCorp [Member] \| Unsecured credit facility, $600 million, expiring March 2018 [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, $600 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600	600
Nevada Power Company [Member] \| Secured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Maximum [Member] \| Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] \| MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] \| BHE [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.70
Maximum [Member] \| PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] \| Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65

XML 110 R74.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] $ in Millions	Feb. 28, 2017 USD ($)
MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375
Debt Instrument, Interest Rate, Stated Percentage	3.10%
MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 475
Debt Instrument, Interest Rate, Stated Percentage	3.95%
MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Debt Instrument, Repurchased Face Amount	$ 250

XML 111 R75.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - NPC (Details) - Nevada Power Company [Member] - USD ($) $ in Millions	Jun. 30, 2017	May 31, 2017	Jan. 31, 2017
Pollution Control Revenue Bonds, Variable-Rate, Series 2006 due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 38.0
Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 38.0
Line of Credit [Member] \| Secured credit facility, $400 million, expiring June 2020 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400.0
NVE Holdings [Member] \| Pollution Control Revenue Bonds, Variable-Rate, Series 2006 due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 39.5
NVE Holdings [Member] \| Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		40.0
NVE Holdings [Member] \| Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 39.5
Debt Instrument, Interest Rate, Stated Percentage		1.60%
NVE Holdings [Member] \| NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 40.0
Debt Instrument, Interest Rate, Stated Percentage		1.80%
NVE Holdings [Member] \| NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 13.0
Debt Instrument, Interest Rate, Stated Percentage		1.60%
NVE Holdings [Member] \| NPC General and Refunding Mortgage Notes, Series AA, No. AA-1 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 39.5
NVE Holdings [Member] \| NPC General and Refunding Mortgage Notes, Series AA, No. AA-2 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		53.0
NVE Holdings [Member] \| Pollution Control Revenue Bonds, Variable-Rate, Series 2006B due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 13.0

XML 112 R76.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - SPPC (Details) $ in Millions	Jun. 30, 2017 USD ($)
Secured credit facility, $250 million, expiring June 2020 [Domain] \| Line of Credit [Member] \| Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250

XML 113 R77.htm IDEA: XBRL DOCUMENT

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Income tax effect of foreign income	(3.00%)	(3.00%)	(4.00%)	(4.00%)
Equity income	1.00%	1.00%	1.00%	1.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
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			$ 659	$ 860

XML 114 R78.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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
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			$ 659	$ 860
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	(74.00%)	(58.00%)	(74.00%)	(58.00%)
State income tax, net of federal income tax benefit	(10.00%)	(6.00%)	(7.00%)	(4.00%)
Effects of ratemaking	(2.00%)	(1.00%)	(4.00%)	(3.00%)
Other, net	(1.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	(52.00%)	(30.00%)	(50.00%)	(30.00%)
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			$ 381	$ 416

XML 115 R79.htm IDEA: XBRL DOCUMENT

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
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			$ 659	$ 860
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	(76.00%)	(60.00%)	(76.00%)	(61.00%)
State income tax, net of federal income tax benefit	(10.00%)	(7.00%)	(8.00%)	(4.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(4.00%)	(3.00%)
Effective income tax rate	(53.00%)	(32.00%)	(53.00%)	(33.00%)
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			$ 386	$ 422

XML 116 R80.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	19	16
Interest cost	15	17	44	55
Expected return on plan assets	(25)	(27)	(74)	(85)
Defined Benefit Plan, Plan Assets, Payment for Settlement	18	0	18	0
Net amortization	17	11	50	34
Net periodic benefit cost	$ 31	$ 6	$ 57	$ 20

XML 117 R81.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - Employer Contributions (Details) - 9 months ended Sep. 30, 2017 £ in Millions, $ in Millions	USD ($)	GBP (£)	GBP (£)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year \| £			£ 45
Employer contributions	$ 43	£ 34

XML 118 R82.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
PacifiCorp [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	3	3	10	11
Expected return on plan assets	(5)	(5)	(16)	(16)
Net amortization	(1)	(1)	(4)	(4)
Net periodic benefit cost	(2)	(2)	(8)	(7)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
Domestic Plan [Member] \| PacifiCorp [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	3
Interest cost	12	14	37	41
Expected return on plan assets	(18)	(18)	(54)	(56)
Net amortization	3	8	10	25
Net periodic benefit cost	$ (3)	$ 5	$ (7)	$ 13

XML 119 R83.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
PacifiCorp [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	0
Employer contributions	0
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
Domestic Plan [Member] \| PacifiCorp [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	5
Employer contributions	$ 3

XML 120 R84.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
MidAmerican Energy Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	1	4	4
Interest cost	3	2	7	7
Expected return on plan assets	(3)	(3)	(10)	(10)
Net amortization	(1)	(1)	(3)	(3)
Net periodic benefit cost	1	(1)	(2)	(2)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
Domestic Plan [Member] \| MidAmerican Energy Company [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3	7	8
Interest cost	8	8	23	25
Expected return on plan assets	(11)	(11)	(33)	(33)
Net amortization	0	0	1	1
Net periodic benefit cost	$ (1)	$ 0	$ (2)	$ 1

XML 121 R85.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
MidAmerican Energy Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	1
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
Domestic Plan [Member] \| MidAmerican Energy Company [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	$ 5

XML 122 R86.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - NPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5
Nevada Power Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1
Nevada Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(4)	$ (4)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9
Domestic Plan [Member] \| Nevada Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(27)	(24)
Domestic Plan [Member] \| Nevada Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(9)	(9)
Domestic Plan [Member] \| Nevada Power Company [Member] \| Other Current Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

XML 123 R87.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - SPPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5
Sierra Pacific Power Company [Member] \| NV Energy, Inc. [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	4
Sierra Pacific Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	25	$ 28
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9
Domestic Plan [Member] \| Sierra Pacific Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	13	12
Domestic Plan [Member] \| Sierra Pacific Power Company [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	9	9
Domestic Plan [Member] \| Sierra Pacific Power Company [Member] \| Other Current Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

XML 124 R88.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(15)		(11)
Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		1
Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		8
Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(10)		(15)
Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(11)		(5)
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	119		135
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(196)		(206)
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
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	16		42
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(10)
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	93		86
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	7		5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(60)		(46)
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	3		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(135)		(150)
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	8		6
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(28)		(22)
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		1
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	2		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(11)		(14)
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	6		3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(17)		(8)
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	22		15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(10)		(10)
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	22		15
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	(3)		(4)
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	(7)		(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	6		8
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(3)
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	6		8
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	(1)		(3)
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	$ 0		$ 0

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Net losses reclassified to cost of sales	(5)	(5)	(38)	(54)
Ending balance	$ 162	$ 195	$ 162	$ 195

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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			$ 10
Commodity derivative [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	$ 21	$ 26	16	$ 46
Changes in fair value recognized in OCI	5	15	28	35
Cash Flow Hedge Gain (Loss), Net, Reclassified to Revenue	0	1	0	1
Net losses reclassified to cost of sales	(7)	(7)	(25)	(47)
Ending balance	$ 19	$ 35	$ 19	$ 35

XML 127 R91.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - Derivative Contract Volumes (Details) £ in Millions, gal in Millions, MWh in Millions, Dth in Millions, $ in Millions	Sep. 30, 2017 USD ($) MWh gal Dth	Sep. 30, 2017 GBP (£) MWh gal Dth	Dec. 31, 2016 USD ($) MWh gal Dth	Dec. 31, 2016 GBP (£) 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	9	9	5	5
Natural gas purchases (in decatherms) [Member] \| Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	339	339	271	271
Fuel purchases (in gallons) [Member] \| Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| gal	2	2	11	11
Mortgage sale commitments, net [Member] \| Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (442)		$ (309)
United States of America, Dollars \| Interest rate swap [Member] \| Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (694)		$ (714)
United Kingdom, Pounds \| Interest rate swap [Member] \| Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount \| £		£ (102)		£ 0

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, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	$ 105	$ 110

XML 129 R93.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
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	119		135
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(196)		(206)
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
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	16		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)		(10)
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	93		86
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	7		5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(60)		(46)
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	3		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(135)		(150)
PacifiCorp [Member] \| Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(100)		(77)
Cash collateral, net receivable, offset against derivative positions	73		69
Derivative assets (liabilities), at fair value, net	(27)		(8)
PacifiCorp [Member] \| Commodity derivative [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	3		18
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	3		18
PacifiCorp [Member] \| Commodity derivative [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	1		2
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	1		2
PacifiCorp [Member] \| Commodity derivative [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(22)		(13)
Cash collateral, net receivable, offset against derivative positions	16		10
Derivative assets (liabilities), at fair value, net	(6)		(3)
PacifiCorp [Member] \| Commodity derivative [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(82)		(84)
Cash collateral, net receivable, offset against derivative positions	57		59
Derivative assets (liabilities), at fair value, net	(25)		(25)
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	7		27
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(107)		(104)
Derivative, fair value, net	(100)		(77)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	97	$ 95	73	$ 102	$ 89	$ 133
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	4		24
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)		(6)
Derivative, fair value, net	3		18
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	1		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Derivative, fair value, net	1		2
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	2		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(24)		(14)
Derivative, fair value, net	(22)		(13)
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	(82)		(84)
Derivative, fair value, net	$ (82)		$ (84)

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Ending balance	162	195	162	195
PacifiCorp [Member]
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	95	89	73	133
Changes in fair value recognized in net regulatory assets	6	15	36	(4)
Net (losses) gains reclassified to operating revenue	(5)	(2)	8	8
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	1	0	(20)	(35)
Ending balance	$ 97	$ 102	$ 97	$ 102

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, 2017 MWh gal Dth	Dec. 31, 2016 MWh gal Dth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	(9)	(5)
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	(339)	(271)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| gal	(2)	(11)
PacifiCorp [Member] \| Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	(3)	(3)
PacifiCorp [Member] \| Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	(97)	(84)
PacifiCorp [Member] \| Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| gal	(2)	(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, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	105	110
PacifiCorp [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	102	97
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	$ 26	$ 22

XML 133 R97.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - MEC - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(15)		(11)
Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		1
Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		8
Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(10)		(15)
Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(11)		(5)
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	119		135
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	196		206
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
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	16		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1		10
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	93		86
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	7		5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	60		46
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	3		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	135		150
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	8		6
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	28		22
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		1
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	2		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	11		14
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	6		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ 17		$ 8

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Ending balance	$ 162	$ 195	$ 162	$ 195

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	$ (21)	$ (26)	$ (16)	$ (46)
Changes in fair value recognized in OCI	5	15	28	35
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ (19)	$ (35)	$ (19)	$ (35)

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, 2017 MWh Dth	Dec. 31, 2016 MWh Dth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	9	5
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	339	271

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, 2017	Dec. 31, 2016
Derivative [Line Items]
Collateral already posted, aggregate fair value	$ 73	$ 69
Derivative, net liability position, aggregate fair value	190	190
Additional collateral, aggregate fair value	$ 105	$ 110

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, 2017

Jun. 30, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Dec. 31, 2015

Not Designated as Hedging Instrument [Member]

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

$ 162

$ 148

$ 195

$ 185

$ 250

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

196

206

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

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

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

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

135

150

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]

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

^[1]

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

^[1]

$ 4

$ 14

[1]

(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 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, 2017 MWh Dth	Dec. 31, 2016 MWh Dth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	9	5
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	339	271
Nevada Power Company [Member] \| Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	0	2
Nevada Power Company [Member] \| Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	149	114

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, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Nevada Power Company [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 2	$ 2

XML 141 R105.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 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		$ 85			$ 74
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	(19)		(19)			(22)
Assets, fair value disclosure	4,284		4,284			2,878
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104		104			96
Derivative liabilities	(131)		(131)			(145)
Cash collateral, net receivable, offset against derivative positions	85		85			74
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,570		3,570			2,339
Derivative liabilities	(1)		(1)			(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	617		617			467
Derivative liabilities	(217)		(217)			(210)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	116		116			94
Derivative liabilities	(17)		(17)			(28)
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	534		534			359
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			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	534		534			359
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			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	855		855			586
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	855		855			586
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			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			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	168		168			161
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	168		168			161
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			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			0
International government obligations [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	5		5			3
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			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	5		5			3
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			0
Corporate obligations [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		37			36
Corporate obligations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Corporate obligations [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		37			36
Corporate obligations [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Municipal obligations [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2			2
Municipal obligations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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		2			2
Municipal obligations [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	1		1			2
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			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	1		1			2
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			0
United States companies [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	270		270			250
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	270		270			250
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			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			0
International companies [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,094		2,094			1,190
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	2,094		2,094			1,190
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			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			0
Investment funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	182		182			147
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	182		182			147
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			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			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	(19)		(19)			(22)
Derivative assets	108		108			119
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104		104			96
Derivative liabilities	(120)		(120)			(132)
Commodity derivative [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1		1			5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(1)			(2)
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	24		24			49
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(207)		(207)			(199)
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	102		102			87
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(16)		(16)			(27)
Interest Rate Contract [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	28		28			23
Derivative liabilities	(11)		(11)			(13)
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			0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0			(1)
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	14		14			16
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(10)		(10)			(11)
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	14		14			7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(1)			(1)
Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	86	$ 56	86	$ 56	$ 81	60	$ 44	$ 47
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(7)	(9)	(19)	(8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	1	2	3	2
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	3	1	5	12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	1	1
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(2)	(5)	(14)	(14)
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	13	11	13	11	8	6	14	4
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(34)	(49)	(100)	(103)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8	0	6	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	37	52	99	96
Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	0	18	0	18	$ 0	$ 0	$ 18	$ 44
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	(6)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	$ 0	$ 0	$ 0	$ 0

XML 142 R106.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 81	$ 44	$ 60	$ 47
Changes included in earnings	7	9	19	8
Changes in fair value recognized in other comprehensive income	(1)	(2)	(3)	(2)
Changes in fair value recognized in net regulatory assets	(3)	(1)	(5)	(12)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	1	1
Fair value, level 3, asset, sales		0		0
Settlements	2	5	14	14
Ending balance	86	56	86	56
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8	14	6	4
Changes included in earnings	34	49	100	103
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8	0	6	0
Fair value, level 3, asset, sales		0		0
Settlements	(37)	(52)	(99)	(96)
Ending balance	13	11	13	11
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	18	0	44
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	0	0	6
Changes in fair value recognized in net regulatory assets	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair value, level 3, asset, sales		0		(32)
Settlements	0	0	0	0
Ending balance	$ 0	$ 18	$ 0	$ 18

XML 143 R107.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 41,197	$ 40,718

XML 144 R108.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	$ 85	$ 74
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	(19)	(22)
Assets, fair value disclosure	4,284	2,878
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104	96
Derivative Liability	(131)	(145)
Cash collateral, net receivable, offset against derivative positions	85	74
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,570	2,339
Derivative Liability	(1)	(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	617	467
Derivative Liability	(217)	(210)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	116	94
Derivative Liability	(17)	(28)
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	(19)	(22)
Derivative assets	108	119
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104	96
Derivative Liability	(120)	(132)
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	5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)	(2)
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	24	49
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(207)	(199)
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	102	87
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(16)	(27)
Money market mutual funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	855	586
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	855	586
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	182	147
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	182	147
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	124	50
PacifiCorp [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	120	30
PacifiCorp [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	7	27
PacifiCorp [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
PacifiCorp [Member] \| Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	73	69
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	(3)	(7)
Derivative assets	4	20
Derivative liability, fair value, gross asset and right to reclaim cash, offset	76	76
Derivative Liability	(31)	(28)
Cash collateral, net receivable, offset against derivative positions	73	69
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	7	27
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(107)	(104)
PacifiCorp [Member] \| Commodity derivative [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] \| Money market mutual funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	100	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	100	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	20	17
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	20	17
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, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	7,005	7,052
PacifiCorp [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 8,277	$ 8,204

XML 146 R110.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC (Details) - USD ($)
$ in Millions

Sep. 30, 2017

Dec. 31, 2016

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

Cash collateral, net receivable, offset against derivative positions

$ 85

$ 74

Recurring [Member]

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

Cash collateral, net receivable, offset against derivative positions

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

(19)

(22)

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

4,284

2,878

104

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]

855

586

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

Recurring [Member] | International government obligations [Member]

168

161

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] | United States companies [Member]

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

Recurring [Member] | International companies [Member]

270

250

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

Recurring [Member] | Investment funds [Member]

2,094

1,190

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

Recurring [Member] | Level 1 [Member]

182

147

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

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

3,570

2,339

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

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

855

586

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

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

168

161

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] | 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]

270

250

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

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

2,094

1,190

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

Recurring [Member] | Level 2 [Member]

182

147

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

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

617

467

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] | 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]

116

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] | 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

(19)

(22)

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

104

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

(1)

(2)

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

(207)

(199)

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

102

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

(16)

(27)

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]

1,027

477

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]

520

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

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

168

161

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] | 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]

270

250

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]

980

426

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]

520

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]

168

161

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] | 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]

270

250

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] | 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] | 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] | 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]

(2)

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

(8)

(3)

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

(6)

(3)

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)

$ (3)

[1]	Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016, 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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Member] \| MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (1)	$ (2)	$ (2)	$ (6)
Fair value, level 3, transferred to affiliate		0		(4)
Changes in fair value recognized in other comprehensive income		0		0
Changes in fair value recognized in net regulatory assets	(2)	(1)	(2)	(5)
Fair value, level 3, asset, sales		0		0
Settlements	1	1	2	13
Ending balance	(2)	(2)	(2)	(2)
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	18	0	44
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	0	0	6
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	0	0	0
Ending balance	0	18	0	18
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	0	18	0	26
Fair value, level 3, transferred to affiliate		0		0
Changes in fair value recognized in other comprehensive income		0		3
Changes in fair value recognized in net regulatory assets	0	0	0	0
Fair value, level 3, asset, sales		0		(11)
Settlements	0	0	0	0
Ending balance	$ 0	$ 18	$ 0	$ 18

XML 148 R112.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,894	4,301
Long-term debt, fair value		$ 4,735
MidAmerican Energy Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,446

XML 149 R113.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,220	4,627
Long-term debt, fair value		$ 5,164
MidAmerican Funding, LLC and Subsidiaries [Domain] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,873

XML 150 R114.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC (Details) - Recurring [Member] - USD ($)
$ in Millions

Sep. 30, 2017

Dec. 31, 2016

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

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

$ 4,284

$ 2,878

Level 1 [Member]

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

3,570

2,339

Level 2 [Member]

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

617

467

Level 3 [Member]

Money market mutual funds [Member]

116

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

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

855

586

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

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

855

586

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

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

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

Investment funds [Member]

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

Investment funds [Member] | Level 1 [Member]

182

147

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

Investment funds [Member] | Level 2 [Member]

182

147

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

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

207

199

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

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

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

226

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

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

226

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

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

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

Nevada Power Company [Member] | Money market mutual funds [Member]

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

Nevada Power Company [Member] | Money market mutual funds [Member] | Level 1 [Member]

^[1]

220

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

Nevada Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]

^[1]

220

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

Nevada Power Company [Member] | Money market mutual funds [Member] | Level 3 [Member]

^[1]

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

Nevada Power Company [Member] | Investment funds [Member]

^[1]

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

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

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]

Nevada Power Company [Member] | Commodity derivative [Member]

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

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

Nevada Power Company [Member] | Commodity derivative [Member] | Level 1 [Member]

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

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

Nevada Power Company [Member] | Commodity derivative [Member] | Level 2 [Member]

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

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

Nevada Power Company [Member] | Commodity derivative [Member] | Level 3 [Member]

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

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

^[2]

$ 4

$ 14

[1]	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 million, respectively.

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (4)	$ (22)	$ (14)	$ (22)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	1	1	3	6
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(1)	(4)	(13)	(9)
Ending balance	$ (4)	$ (19)	$ (4)	$ (19)

XML 152 R116.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,599	2,581
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
Level 2 [Member] \| Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 3,055	$ 3,040

XML 153 R117.htm IDEA: XBRL DOCUMENT

Fair Value Measurements Fair Value Measurements - SPPC (Details) - Recurring [Member] - USD ($)
$ in Millions

Sep. 30, 2017

Dec. 31, 2016

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

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

$ 4,284

$ 2,878

Level 1 [Member]

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

3,570

2,339

Level 2 [Member]

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

617

467

Level 3 [Member]

Investment funds [Member]

116

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

Investment funds [Member] | Level 1 [Member]

182

147

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

Investment funds [Member] | Level 2 [Member]

182

147

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

Investment funds [Member] | Level 3 [Member]

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

Money market mutual funds [Member]

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

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

855

586

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

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

855

586

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

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

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

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

Sierra Pacific Power Company [Member] | Level 1 [Member]

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

Sierra Pacific Power Company [Member] | Level 2 [Member]

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

Sierra Pacific Power Company [Member] | Level 3 [Member]

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

Sierra Pacific Power Company [Member] | Investment funds [Member]

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

Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 1 [Member]

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

Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 2 [Member]

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

Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 3 [Member]

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

Sierra Pacific Power Company [Member] | Money market mutual funds [Member]

$ 0

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

Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 1 [Member]

^[1]

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

Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]

^[1]

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

Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 3 [Member]

^[1]

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

^[1]

$ 0

[1]	(1)Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

XML 154 R118.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,120	1,119
Sierra Pacific Power Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,201	$ 1,191

XML 155 R119.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 114
PacifiCorp [Member] \| Klamath Hydroelectric System [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] \| Klamath Hydroelectric System [Member] \| OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] \| Klamath Hydroelectric System [Member] \| CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	250
Natural Gas Contracts For Resale [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation, Due Through Fifth Year	247
Purchase Obligation, Due after Fifth Year	70
Capital Addition Purchase Commitments [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	675
Purchase Obligation, Due in Next Twelve Months	84
Purchase Obligation, Due in Second Year	340
Purchase Obligation, Due in Third Year	$ 8

- Details

Name:	bhe_HydroelectricSystemNameAxis=bhe_KlamathHydroelectricSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

XML 156 R120.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, 2017 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 157 R121.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 30, 2017 USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 114
Natural Gas Contracts For Resale [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation, Due Through Fifth Year	247
Purchase Obligation, Due after Fifth Year	70
Capital Addition Purchase Commitments [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	675
Purchase Obligation, Due in Next Twelve Months	84
Purchase Obligation, Due in Second Year	340
Purchase Obligation, Due in Third Year	$ 8

XML 158 R122.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] - Electric Transmission [Member] $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity Adder, Percentage	0.50%
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Accrued liability for estimated transmission billings refunds	$ 9
Prior to September 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
November 2013 to February 2015 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	10.32%
Public Utilities, Intervenor Proposed Return On Equity, Percentage	9.15%
February 2015 through May 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

XML 159 R123.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - NPC - Environmental Laws and Regulations (Details) - Nevada Power Company [Member] - MW	1 Months Ended		9 Months Ended	12 Months Ended
	Apr. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
300 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity						300
257 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity		257
812 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity			812
272 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity						272
210 Megawatts of Natural Gas 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 Solar Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity				100	100
130 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	130
Ownership Percentage Acquired	25.00%
54 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	54
35 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			35

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (1,511)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	$ 15	$ 18	16	$ 80
Other comprehensive income (loss), foreign currency translation adjustment	227	(134)	535	(339)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Ending balance - Accumulated other comprehensive loss, net	(423)		(423)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits			(447)	(438)
Beginning balance - foreign currency translation adjustment			(1,675)	(1,092)
Beginning balance - unrealized gains (losses) on available-for-sale securities			585	615
Beginning balance - unrealized gains (losses) on cash flow hedges			26	7
Beginning balance - Accumulated other comprehensive loss, net			(1,511)	(908)
Other comprehensive income (loss), unrecognized amounts on retirement benefits			16	80
Other comprehensive income (loss), foreign currency translation adjustment			535	(339)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(5)	(2)
Other comprehensive income (loss)			1,088	(110)
Ending balance - unrecognized amounts on retirement benefits	(431)	(358)	(431)	(358)
Ending balance - foreign currency translation adjustment	(1,140)	(1,431)	(1,140)	(1,431)
Ending balance - unrealized gains (losses) on available-for-sale securities	1,127	766	1,127	766
Ending balance - unrealized gains (losses) on cash flow hedges	21	5	21	5
Ending balance - Accumulated other comprehensive loss, net	$ (423)	$ (1,018)	$ (423)	$ (1,018)

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (1,511)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	$ 423	$ 80	542	$ 151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Ending balance - Accumulated other comprehensive loss, net	(423)		(423)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities			585	615
Beginning balance - unrealized gains (losses) on cash flow hedges			26	7
Beginning balance - Accumulated other comprehensive loss, net			(1,511)	(908)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(5)	(2)
Other comprehensive income (loss)			1,088	(110)
Ending balance - unrealized gains (losses) on available-for-sale securities	1,127	766	1,127	766
Ending balance - unrealized gains (losses) on cash flow hedges	21	5	21	5
Ending balance - Accumulated other comprehensive loss, net	$ (423)	(1,018)	$ (423)	(1,018)
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss)				2
Dividend, unrealized losses on cash flow hedges, transfer of operations				(90)
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)
Beginning balance - unrealized gains (losses) on cash flow hedges				(27)
Beginning balance - Accumulated other comprehensive loss, net				(30)
Other comprehensive income (loss), unrealized gains on available-for-sale securities				2
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges				0
Other comprehensive income (loss)				2
Dividend, unrealized losses on cash flow hedges, transfer of operations				(27)
Ending balance - unrealized gains (losses) on available-for-sale securities		(1)		(1)
Ending balance - unrealized gains (losses) on cash flow hedges		0		0
Ending balance - Accumulated other comprehensive loss, net		$ (1)		$ (1)

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Sales revenue from energy operations	4,322	4,272	11,501	11,102
Real estate	961	820	2,502	2,152
Depreciation and amortization - energy operations	(635)	(639)	(1,905)	(1,898)
Depreciation and amortization	651	648	1,943	1,922
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Interest Costs Capitalized Adjustment	14	14	34	128
Allowance for equity funds	24	17	59	147
Interest and dividend income	32	39	85	93
Other, net	2	15	24	26
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Assets	91,054		91,054		$ 85,440
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,430	1,434	3,956	3,919
Depreciation and amortization - energy operations	(200)	(193)	(598)	(589)
Operating income	467	445	1,150	1,108
Interest expense	95	95	285	286
Assets	23,578		23,578		23,563
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	815	797	2,170	2,008
Depreciation and amortization - energy operations	(112)	(118)	(370)	(338)
Operating income	288	284	531	524
Interest expense	59	55	177	164
Assets	19,019		19,019		17,571
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,047	987	2,384	2,309
Depreciation and amortization - energy operations	(105)	(106)	(315)	(315)
Operating income	393	394	682	656
Interest expense	57	60	173	190
Assets	14,344		14,344		14,320
Northern Powergrid [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	221	220	685	748
Depreciation and amortization - energy operations	(55)	(49)	(156)	(149)
Operating income	81	90	308	373
Interest expense	34	33	98	105
Assets	7,280		7,280		6,433
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	193	201	700	704
Depreciation and amortization - energy operations	(42)	(53)	(115)	(160)
Operating income	65	68	328	320
Interest expense	11	13	33	39
Assets	4,958		4,958		5,144
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	182	169	506	309
Depreciation and amortization - energy operations	(58)	(61)	(165)	(177)
Operating income	86	81	236	35
Interest expense	45	40	125	114
Assets	9,182		9,182		8,378
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	283	273	647	582
Depreciation and amortization - energy operations	(63)	(57)	(187)	(169)
Operating income	157	157	256	233
Interest expense	51	51	153	148
Assets	7,492		7,492		7,010
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	961	820	2,502	2,152
Depreciation and amortization	16	9	38	24
Operating income	79	87	191	179
Interest expense	1	1	3	2
Assets	2,834		2,834		1,776
BHE And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	151	191	453	523
Depreciation and amortization - energy operations	0	(2)	1	(1)
Operating income	8	(21)	(38)	(36)
Interest expense	111	112	332	353
Assets	2,367		2,367		$ 1,245
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4,869	4,697	12,793	12,185
Income before income tax expense and equity income	1,113	1,089	2,065	1,945
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	221	220	685	748
Income before income tax expense and equity income	49	74	213	284
CANADA
Segment Reporting Information [Line Items]
Revenues	182	170	506	313
Income before income tax expense and equity income	47	43	127	114
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	11	5	19	8
Income before income tax expense and equity income	$ 23	$ 4	$ 62	$ 42

XML 163 R127.htm IDEA: XBRL DOCUMENT

Segment Information - Goodwill (Details) $ in Millions	9 Months Ended
Segment Information - Goodwill (Details) $ in Millions	Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,010
Acquisitions	522
Foreign currency translation	170
Other	(2)
Ending balance	9,700
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	930
Acquisitions	0
Foreign currency translation	56
Other	0
Ending balance	986
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	75
Acquisitions	0
Foreign currency translation	0
Other	(2)
Ending balance	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,470
Acquisitions	0
Foreign currency translation	114
Other	0
Ending balance	1,584
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	840
Acquisitions	522
Foreign currency translation	0
Other	0
Ending balance	$ 1,362

XML 164 R128.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| OperatingSegments			8
Revenues	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating income	1,624	1,585	3,644	3,392
Assets	91,054		$ 91,054		$ 85,440
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments \| ReportableSegments			2
Electric Domestic Regulated Revenue	707	692	$ 1,677	1,572
Revenues	813	795	2,166	2,004
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Operating income	288	284	530	523
Assets	16,902		16,902		15,459
MidAmerican Energy Company [Member] \| Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Utilities Operating Expense, Depreciation and Amortization	101	107	338	306
Operating income	290	289	485	481
Assets	15,556		15,556		14,113
MidAmerican Energy Company [Member] \| Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	103	102	485	430
Utilities Operating Expense, Depreciation and Amortization	10	11	31	32
Operating income	(2)	(5)	45	42
Assets	1,339		1,339		1,345
MidAmerican Energy Company [Member] \| Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	3	$ 1	4	$ 2
Assets	$ 7		$ 7		$ 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, 2017

USD ($)

Sep. 30, 2016

USD ($)

Sep. 30, 2017

USD ($)

OperatingSegments

ReportableSegments

Sep. 30, 2016

USD ($)

Dec. 31, 2016

USD ($)

Number of reportable segments | OperatingSegments

$ 5,283

$ 5,092

$ 14,003

$ 13,254

1,624

1,585

3,644

3,392

91,054

$ 91,054

$ 85,440

Number of reportable segments | ReportableSegments

707

692

$ 1,677

1,572

Utilities Operating Expense, Depreciation and Amortization

815

797

2,170

2,008

111

118

369

338

288

284

531

524

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

^[1]

18,196

16,747

Utilities Operating Expense, Depreciation and Amortization

707

692

1,677

1,572

101

107

338

306

290

289

485

481

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

^[1]

16,747

15,304

Gas Domestic Regulated Revenue

103

102

485

430

Utilities Operating Expense, Depreciation and Amortization

(2)

(5)

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

^[1]

1,418

1,424

Other Revenue, Net

$ 0

$ 1

^[1]

$ 31

$ 19

[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, 2017

USD ($)

Sep. 30, 2016

USD ($)

Sep. 30, 2017

USD ($)

OperatingSegments

TheNumberOfReportableSegments

Sep. 30, 2016

USD ($)

Dec. 31, 2016

USD ($)

Number of reportable segments | OperatingSegments

$ 5,283

$ 5,092

$ 14,003

$ 13,254

Cost of sales

1,212

1,187

3,380

3,252

1,624

1,585

3,644

3,392

464

460

1,379

1,401

91,054

$ 91,054

$ 85,440

Number of reportable segments | TheNumberOfReportableSegments

Gas Domestic Regulated Revenue

215

207

$ 534

539

Cost of Purchased Oil and Gas

230

222

600

620

Cost of sales

193

208

Cost of Sales

219

250

Gross Margin

150

144

381

370

Utilities Operating Expense, Maintenance and Operations

121

126

Utilities Operating Expense, Depreciation and Amortization

157

138

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

3,507

3,493

Utilities Operating Expense, Maintenance and Operations

215

207

534

539

Cost of sales

193

208

Gross Margin

139

134

341

331

108

112

Utilities Operating Expense, Depreciation and Amortization

142

127

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

3,165

3,119

Gas Domestic Regulated Revenue

Cost of Purchased Oil and Gas

Gross Margin

Utilities Operating Expense, Maintenance and Operations

Utilities Operating Expense, Depreciation and Amortization

$ 1

$ 4

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

305

314