Document

Cash and cash equivalents

Current assets:

370

172

Accounts receivable, net

341

348

Income tax receivable

Inventories

201

245

Other current assets

116

134

Total current assets

1,046

963

Property, plant and equipment, net

14,686

14,221

Goodwill

1,270

Regulatory assets

225

204

Investments and restricted cash and cash equivalents and investments

731

730

Other assets

214

233

Total assets

^[1]

18,172

17,621

Current liabilities:

Accounts payable

270

451

Accrued interest

Accrued property, income and other taxes

230

133

Notes Payable, Related Parties, Current

161

164

Current portion of long-term debt

500

350

Other current liabilities

140

128

Total current liabilities

1,359

1,279

Long-term debt

5,120

4,932

Deferred income taxes

2,188

2,235

Regulatory liabilities

1,779

1,661

Asset retirement obligations

538

528

Other long-term liabilities

322

326

Total liabilities

11,306

10,961

Commitments and contingencies

Equity:

Additional paid-in capital

1,679

Retained earnings

5,187

4,981

Total member's equity

6,866

6,660

Total liabilities and equity

$ 18,172

$ 17,621

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

XML 46 R8.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - NPC - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,224	$ 935
Inventories	860	888
Other current assets	881	815
Total current assets	6,114	5,778
Regulatory assets	2,783	2,761
Other assets	1,261	1,248
Total assets	90,941	90,208
Current liabilities:
Accounts payable	1,189	1,519
Accrued interest	516	488
Accrued property, income and other taxes	413	354
Other current liabilities	1,152	1,049
Total current liabilities	10,408	11,603
Regulatory liabilities	7,496	7,309
Deferred income taxes	8,592	8,242
Other long-term liabilities	2,792	2,984
Total liabilities	62,637	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,358	6,368
Retained earnings	23,976	22,206
Accumulated other comprehensive loss, net	(1,665)	(398)
Total BHE shareholders' equity	28,175	28,176
Total liabilities and equity	90,941	90,208
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	416	57
Accounts receivable, net	303	238
Inventories	59	59
Regulatory assets	5	28
Other current assets	54	44
Total current assets	837	426
Property, plant and equipment, net	6,834	6,877
Regulatory assets	908	941
Other assets	39	35
Total assets	8,618	8,279
Current liabilities:
Accounts payable	166	156
Accrued interest	51	50
Accrued property, income and other taxes	78	63
Regulatory liabilities	105	91
Current portion of long-term debt and financial and capital lease obligations	1,013	842
Customer deposits	68	73
Other current liabilities	36	16
Total current liabilities	1,517	1,291
Long-term debt and financial and capital lease obligations	2,303	2,233
Regulatory liabilities	1,015	1,030
Deferred income taxes	758	767
Other long-term liabilities	283	280
Total liabilities	5,876	5,601
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	438	374
Accumulated other comprehensive loss, net	(4)	(4)
Total BHE shareholders' equity	2,742	2,678
Total liabilities and equity	$ 8,618	$ 8,279

XML 47 R9.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Common stock, shares authorized	115,000,000	115,000,000
Common stock, shares issued	77,000,000	77,000,000
Common stock, shares outstanding	77,000,000	77,000,000
Nevada Power Company [Member]
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 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 48 R10.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - SPPC - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,224	$ 935
Inventories	860	888
Other current assets	881	815
Total current assets	6,114	5,778
Regulatory assets	2,783	2,761
Other assets	1,261	1,248
Total assets	90,941	90,208
Current liabilities:
Accounts payable	1,189	1,519
Accrued interest	516	488
Accrued property, income and other taxes	413	354
Other current liabilities	1,152	1,049
Total current liabilities	10,408	11,603
Regulatory liabilities	7,496	7,309
Deferred income taxes	8,592	8,242
Other long-term liabilities	2,792	2,984
Total liabilities	62,637	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,358	6,368
Retained earnings	23,976	22,206
Accumulated other comprehensive loss, net	(1,665)	(398)
Total BHE shareholders' equity	28,175	28,176
Total liabilities and equity	90,941	90,208
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	71	4
Accounts receivable, net	91	112
Inventories	48	49
Regulatory assets	12	32
Other current assets	18	17
Total current assets	240	214
Property, plant and equipment, net	2,923	2,892
Regulatory assets	297	300
Other assets	8	7
Total assets	3,468	3,413
Current liabilities:
Accounts payable	77	92
Accrued interest	14	14
Accrued property, income and other taxes	22	10
Regulatory liabilities	37	19
Current portion of long-term debt and financial and capital lease obligations	2	2
Customer deposits	18	15
Other current liabilities	23	12
Total current liabilities	193	164
Long-term debt and financial and capital lease obligations	1,153	1,152
Regulatory liabilities	473	481
Deferred income taxes	332	330
Other long-term liabilities	105	114
Total liabilities	2,256	2,241
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	102	62
Accumulated other comprehensive loss, net	(1)	(1)
Total BHE shareholders' equity	1,212	1,172
Total liabilities and equity	$ 3,468	$ 3,413

XML 49 R11.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Common stock, shares authorized	115,000,000	115,000,000
Common stock, shares issued	77,000,000	77,000,000
Common stock, shares outstanding	77,000,000	77,000,000
Sierra Pacific Power Company [Member]
Common Stock, Par or Stated Value Per Share	$ 3.75	$ 3.75
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000

XML 50 R12.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Jun. 30, 2018	Dec. 31, 2017
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 51 R13.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenue:
Energy	$ 3,720	$ 3,598	$ 7,399	$ 7,179
Real estate	1,273	956	2,034	1,541
Total operating revenue	4,993	4,554	9,433	8,720
Energy:
Cost of sales	1,126	1,049	2,294	2,168
Operations and maintenance	849	817	1,633	1,562
Depreciation and amortization	739	660	1,443	1,270
Property and other taxes	142	137	286	279
Real estate	1,165	846	1,934	1,429
Total operating expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Other income (expense):
Interest expense	(461)	(457)	(927)	(915)
Capitalized interest	15	10	27	20
Allowance for equity funds	24	18	45	35
Interest and dividend income	32	27	58	53
(Losses) gains on marketable securities, net	(387)	2	(596)	5
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax (benefit) expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Equity income	14	26	26	50
Net income	378	587	896	1,150
Net income attributable to noncontrolling interests	6	13	11	20
Net income attributable to BHE shareholders	$ 372	$ 574	$ 885	$ 1,130

XML 52 R14.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses:
Operating income	$ 972	$ 1,045	$ 1,843	$ 2,012
Other income (expense):
Interest expense	(461)	(457)	(927)	(915)
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net income attributable to BHE shareholders	372	574	885	1,130
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,193	1,245	2,377	2,526
Operating expenses:
Cost of Domestic Regulated Electric	402	399	835	840
Utilities Operating Expense, Maintenance and Operations	261	263	511	517
Utilities Operating Expense, Depreciation and Amortization	197	202	399	398
Utilities Operating Expense, Taxes	49	48	101	99
Utilities Operating Expense	909	912	1,846	1,854
Operating income	284	333	531	672
Other income (expense):
Interest expense	(96)	(95)	(192)	(190)
Interest Costs Capitalized Adjustment	4	4	8	8
Allowance for equity funds	8	7	15	14
Other, net	11	9	22	18
Total other income (expense)	(73)	(75)	(147)	(150)
Income before income tax expense and equity income	211	258	384	522
Income tax (benefit) expense	27	83	52	168
Net income attributable to BHE shareholders	$ 184	$ 175	$ 332	$ 354

XML 53 R15.htm IDEA: XBRL DOCUMENT

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Statements of Operations - MEC - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenue:
Total operating revenue	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Operating expenses:
Total operating costs and expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Other income (expense):
Interest expense	(461)	(457)	(927)	(915)
Allowance for borrowed funds	15	10	27	20
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax (benefit) expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net Income (Loss) Attributable to Parent	372	574	885	1,130
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	589	537	1,058	970
Gas Domestic Regulated Revenue And Other Revenue	128	121	405	383
Total operating revenue	717	658	1,463	1,353
Operating expenses:
Cost of fuel and energy	118	110	226	212
Cost of gas purchased for resale and other	67	62	246	234
Utilities Operating Expense, Maintenance and Operations	207	186	397	357
Utilities Operating Expense, Depreciation and Amortization	208	141	366	258
Utilities Operating Expense, Taxes	30	29	62	60
Total operating costs and expenses	630	528	1,297	1,121
Operating income	87	130	166	232
Other income (expense):
Interest expense	(56)	(53)	(114)	(106)
Allowance for borrowed funds	4	3	8	5
Allowance for equity funds	13	8	23	14
Other, net	12	7	21	18
Total other income (expense)	(27)	(35)	(62)	(69)
Income before income tax (benefit) expense and equity income	60	95	104	163
Income tax (benefit) expense	(46)	(39)	(108)	(76)
Net Income (Loss) Attributable to Parent	$ 106	$ 134	$ 212	$ 239

XML 54 R16.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenue:
Total operating revenue	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Operating expenses:
Total operating expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Other income (expense):
Other Interest and Dividend Income	(461)	(457)	(927)	(915)
Allowance for borrowed funds	15	10	27	20
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax (benefit) expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net Income (Loss) Attributable to Parent	372	574	885	1,130
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	589	537	1,058	970
Gas Domestic Regulated Revenue And Other Revenue	129	122	407	385
Total operating revenue	718	659	1,465	1,355
Operating expenses:
Cost of fuel and energy	118	110	226	212
Cost of gas purchased for resale and other	67	63	247	235
Utilities Operating Expense, Maintenance and Operations	208	185	398	357
Utilities Operating Expense, Depreciation and Amortization	208	141	366	258
Utilities Operating Expense, Taxes	30	29	62	60
Total operating expenses	631	528	1,299	1,122
Operating income	87	131	166	233
Other income (expense):
Other Interest and Dividend Income	(61)	(59)	(124)	(118)
Allowance for borrowed funds	4	3	8	5
Allowance for equity funds	13	8	23	14
Other, net	13	7	23	18
Total other income (expense)	(31)	(41)	(70)	(81)
Income before income tax (benefit) expense and equity income	56	90	96	152
Income tax (benefit) expense	(47)	(41)	(110)	(81)
Net Income (Loss) Attributable to Parent	$ 103	$ 131	$ 206	$ 233

XML 55 R17.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cost of fuel and energy	$ 1,126	$ 1,049	$ 2,294	$ 2,168
Total operating costs and expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Interest expense	(461)	(457)	(927)	(915)
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net income attributable to BHE shareholders	372	574	885	1,130
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	562	574	957	966
Cost of fuel and energy	239	238	409	403
Utilities Operating Expense, Maintenance and Operations	107	92	198	180
Utilities Operating Expense, Depreciation and Amortization	84	78	168	154
Utilities Operating Expense, Taxes	10	9	20	19
Total operating costs and expenses	440	417	795	756
Operating income	122	157	162	210
Interest expense	(45)	(44)	(90)	(88)
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	0
Allowance for equity funds	0	0	1	1
Other, net	5	7	9	12
Total other income (expense)	(39)	(37)	(79)	(75)
Income before income tax expense and equity income	83	120	83	135
Income tax (benefit) expense	19	43	19	48
Net income attributable to BHE shareholders	$ 64	$ 77	$ 64	$ 87

XML 56 R18.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total operating revenue	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Cost of fuel and energy	1,126	1,049	2,294	2,168
Total operating expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Interest expense	(461)	(457)	(927)	(915)
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net income attributable to BHE shareholders	372	574	885	1,130
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	169	160	350	319
Gas Domestic Regulated Revenue	19	17	60	51
Total operating revenue	188	177	410	370
Cost of fuel and energy	78	61	155	117
Cost of natural gas purchased for resale	8	6	31	22
Utilities Operating Expense, Maintenance and Operations	48	40	87	81
Utilities Operating Expense, Depreciation and Amortization	29	28	59	56
Utilities Operating Expense, Taxes	6	6	12	12
Total operating expenses	169	141	344	288
Operating income	19	36	66	82
Interest expense	(11)	(11)	(21)	(22)
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	0
Allowance for equity funds	1	0	2	1
Other, net	3	1	5	2
Total other income (expense)	(6)	(10)	(13)	(19)
Income before income tax expense and equity income	13	26	53	63
Income tax (benefit) expense	6	9	12	22
Net income attributable to BHE shareholders	$ 7	$ 17	$ 41	$ 41

XML 57 R19.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 378	$ 587	$ 896	$ 1,150
Other comprehensive income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	(54)	4	(51)	(1)
Foreign currency translation adjustment	(307)	221	(234)	308
Unrealized gains on marketable securities, net of tax	0	81	0	119
Unrealized losses on cash flow hedges, net of tax	3	(2)	1	(6)
Total other comprehensive (loss) income, net of tax	(250)	296	(182)	422
Comprehensive income	128	883	714	1,572
Comprehensive income attributable to noncontrolling interests	6	13	11	20
Comprehensive income attributable to BHE shareholders	$ 122	$ 870	$ 703	$ 1,552

XML 58 R20.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 16	$ (3)	$ 12	$ (4)
Unrealized (losses) gains on marketable securities, tax	0	53	0	71
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (2)	$ 0	$ (4)

XML 59 R21.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]	Long-term income tax receivable [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	Noncontrolling Interest [Member]
Balance (shares) at Dec. 31, 2016		77
Balance at Dec. 31, 2016	$ 24,463	$ 0	$ 6,390		$ 19,448	$ (1,511)	$ 136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,139	0	0		1,130	0	9
Other comprehensive income (loss)	422	0	0		0	422	0
Common stock purchases	(19)	0	(1)		(18)	0	0
Conversion of Stock, Amount Converted	(100)		(6)		(94)
Distributions	(12)	0	0		0	0	(12)
Other equity transactions	(23)	$ 0	(21)		1	0	(3)
Balance (shares) at Jun. 30, 2017		77
Balance at Jun. 30, 2017	25,870	$ 0	6,362		20,467	(1,089)	130
Long-term income tax receivable	$ 0
Balance (shares) at Dec. 31, 2017	77	77
Balance at Dec. 31, 2017	$ 28,308	$ 0	6,368		22,206	(398)	132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0				1,085	(1,085)
Net Income	893	0	0		885	0	8
Other comprehensive income (loss)	(182)	0	0		0	(182)	0
Reclassification of long-term income tax receivable	(609)			$ (609)
Long-term income tax receivable adjustments				115	(115)
Common stock purchases	(90)	0	(5)		(85)	0	0
Distributions	(12)	$ 0	0		0	0	(12)
Other equity transactions	$ (4)		(5)				1
Balance (shares) at Jun. 30, 2018	77	77
Balance at Jun. 30, 2018	$ 28,304	$ 0	$ 6,358		$ 23,976	$ (1,665)	$ 129
Long-term income tax receivable	$ (494)			$ (494)

XML 60 R22.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, 2016						$ 7,390	$ 2	$ 0	$ 4,479	$ 2,921	$ (12)
Net Income (Loss) Attributable to Parent	$ 1,130					354				354
Total other comprehensive (loss) income, net of tax	422	$ 0	$ 0	$ 0	$ 422
Dividends, Common Stock, Cash						(200)				(200)
Stockholders' Equity Attributable to Parent at Jun. 30, 2017						7,544	2	0	4,479	3,075	(12)
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176					7,555	2	0	4,479	3,089	(15)
Net Income (Loss) Attributable to Parent	885					332				332
Total other comprehensive (loss) income, net of tax	(182)	$ 0	$ 0	$ 0	$ (182)
Dividends, Common Stock, Cash						(350)				(350)
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	$ 28,175					$ 7,537	$ 2	$ 0	$ 4,479	$ 3,071	$ (15)

XML 61 R23.htm IDEA: XBRL DOCUMENT

Statements of Changes in Shareholder's Equity - MEC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [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] Additional Paid-in Capital [Member]	MidAmerican Energy Company [Member] Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016						$ 5,160	$ 0	$ 561	$ 4,599
Net Income (Loss) Attributable to Parent	$ 1,130					239			239
Other comprehensive income (loss)	422	$ 0	$ 0	$ 0	$ 422
Stockholders' Equity, Other	(23)	0	(21)	1	0	(1)			(1)
Stockholders' Equity Attributable to Parent at Jun. 30, 2017						5,398	0	561	4,837
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176					5,764	0	561	5,203
Net Income (Loss) Attributable to Parent	885					212			212
Other comprehensive income (loss)	(182)	$ 0	0	$ 0	$ (182)
Stockholders' Equity, Other	(4)		$ (5)			1			1
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	$ 28,175					$ 5,977	$ 0	$ 561	$ 5,416

XML 62 R24.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Changes in Member's Equity - MidAmerican Funding - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain] Additional Paid-in Capital [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain] Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 6,086	$ 1,679	$ 4,407
Net Income (Loss) Attributable to Parent	$ 1,130				233		233
Other comprehensive income (loss)	422	$ 0	$ 0	$ 422
Stockholders' Equity Attributable to Parent at Jun. 30, 2017					6,319	1,679	4,640
Stockholders' Equity, Other	(23)	(21)	1	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				6,660	1,679	4,981
Net Income (Loss) Attributable to Parent	885				206		206
Other comprehensive income (loss)	(182)	0	$ 0	$ (182)
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	28,175				$ 6,866	$ 1,679	$ 5,187
Stockholders' Equity, Other	$ (4)	$ (5)

XML 63 R25.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, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016						$ 2,972	$ 0	$ 2,308	$ 667	$ (3)
Net Income (Loss) Attributable to Parent	$ 1,130					87			87
Dividends, Common Stock, Cash						322			322
Stockholders' Equity, Other	$ 23	$ 0	$ 21	$ (1)	$ 0	(1)			(1)
Balance (shares) at Jun. 30, 2017		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Jun. 30, 2017						$ 2,738	$ 0	2,308	433	(3)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	$ 28,176					$ 2,678	$ 0	2,308	374	(4)
Net Income (Loss) Attributable to Parent	885					$ 64			64
Stockholders' Equity, Other	$ 4		$ 5
Balance (shares) at Jun. 30, 2018	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	$ 28,175					$ 2,742	$ 0	$ 2,308	$ 438	$ (4)

XML 64 R26.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, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016						$ 1,108	$ 0	$ 1,111	$ (2)	$ (1)
Net Income (Loss) Attributable to Parent	$ 1,130					41			41
Dividends, Common Stock, Cash						5	0		5	0
Stockholders' Equity, Other	$ 23	$ 0	$ 21	$ (1)	$ 0	(1)	$ 0	0	1
Balance (shares) at Jun. 30, 2017		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Jun. 30, 2017						$ 1,143	$ 0	1,111	33	(1)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	$ 28,176					$ 1,172	$ 0	1,111	62	(1)
Net Income (Loss) Attributable to Parent	885					41			41
Stockholders' Equity, Other	$ 4		$ 5			$ (1)			1
Balance (shares) at Jun. 30, 2018	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	$ 28,175					$ 1,212	$ 0	$ 1,111	$ 102	$ (1)

XML 65 R27.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 896	$ 1,150
Adjustments to reconcile net income to net cash flows from operating activities:
(Losses) gains on marketable securities, net	(596)	5
Depreciation and amortization	1,466	1,292
Allowance for equity funds	(45)	(35)
Equity income, net of distributions	1	(9)
Changes in regulatory assets and liabilities	206	21
Deferred income taxes and amortization of investment tax credits	(264)	341
Other, net	26	8
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(226)	(73)
Derivative collateral, net	(5)	(13)
Pension and other postretirement benefit plans	(23)	(25)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Cash flows from investing activities:
Capital expenditures	(2,779)	(1,813)
Acquisitions, net of cash acquired		(588)
Purchases of marketable securities	209	122
Proceeds from sales of marketable securities	184	127
Equity method investments	(151)	(79)
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Cash flows from financing activities:
Proceeds from BHE senior debt	2,176	0
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Common stock purchases	(90)	(19)
Proceeds from subsidiary debt	1,313	1,163
Repayments of subsidiary debt	(1,082)	(668)
Net (repayments of) proceeds from short-term debt	(1,048)	617
Purchase of redeemable noncontrolling interest	(131)	0
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Effect of exchange rate changes	(3)	3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,544	$ 1,065

XML 66 R28.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(45)	(35)
Changes in regulatory assets and liabilities	206	21
Deferred income taxes and amortization of investment tax credits	(264)	341
Other Noncash Income (Expense)	26	8
Trade receivables and other assets	(226)	(73)
Derivative collateral, net	(5)	(13)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Net proceeds from (repayments of) short-term debt	1,048	(617)
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	332	354
Utilities Operating Expense, Depreciation and Amortization	399	398
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(15)	(14)
Changes in regulatory assets and liabilities	116	24
Deferred income taxes and amortization of investment tax credits	(52)	(5)
Other Noncash Income (Expense)	1	1
Trade receivables and other assets	22	65
Increase (Decrease) in Inventories	(16)	(12)
Derivative collateral, net	(3)	(4)
Increase (Decrease) in Prepaid Expense	11	10
Accrued property, income and other taxes, net	111	205
Accounts payable and other liabilities	11	21
Net cash flows from operating activities	917	1,043
Capital expenditures	(499)	(370)
Other, net	0	1
Net cash flows from investing activities	(499)	(369)
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(87)	(53)
Net proceeds from (repayments of) short-term debt	28	(270)
Payments of Ordinary Dividends, Common Stock	(350)	(200)
Other, net	(1)	(1)
Net cash flows from financing activities	(410)	(524)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	8	150
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 37	$ 183

XML 67 R29.htm IDEA: XBRL DOCUMENT

Statements of Cash Flows - MEC - USD ($) $ in Millions	6 Months Ended
Statements of Cash Flows - MEC - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Other Noncash Income (Expense)	26	8
Derivative collateral, net	(5)	(13)
Pension and other postretirement benefit plans	(23)	(25)
Accrued property, income and other taxes, net	174	(244)
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Purchases of marketable securities	209	122
Proceeds from sales of marketable securities	184	127
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net (repayments of) proceeds from short-term debt	(1,048)	617
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,224
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	212	239
Utilities Operating Expense, Depreciation and Amortization	366	258
Amortization of Utility Plant to Other Operating Expense	17	17
Allowance for equity funds	(23)	(14)
Deferred income taxes and amortization of investment tax credits	(10)	27
Other Noncash Income (Expense)	7	(1)
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	(1)	(16)
Increase (Decrease) in Inventories	45	30
Derivative collateral, net	0	2
Pension and other postretirement benefit plans	(7)	(5)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(97)	(75)
Accrued property, income and other taxes, net	140	(83)
Net cash flows from operating activities	651	411
Capital expenditures	(818)	(545)
Purchases of marketable securities	147	81
Proceeds from sales of marketable securities	125	77
Other, net	27	(3)
Net cash flows from investing activities	(813)	(552)
Proceeds from Issuance of Long-term Debt	687	843
Repayments of BHE senior debt and junior subordinated debentures	(350)	(255)
Net (repayments of) proceeds from short-term debt	0	(99)
Other, net	(1)	0
Net cash flows from financing activities	336	489
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	174	348
Cash and cash equivalents and restricted cash and cash equivalents at end of period	369
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 456	$ 374

XML 68 R30.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Other Noncash Income (Expense)	26	8
Derivative collateral, net	(5)	(13)
Pension and other postretirement benefit plans	(23)	(25)
Accrued property, income and other taxes, net	174	(244)
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Purchases of marketable securities	(209)	(122)
Proceeds from sales of marketable securities	184	127
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net (repayments of) proceeds from short-term debt	(1,048)	617
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,224
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	206	233
Utilities Operating Expense, Depreciation and Amortization	366	258
Amortization of Utility Plant to Other Operating Expense	17	17
Allowance for equity funds	(23)	(14)
Deferred income taxes and amortization of investment tax credits	(10)	27
Other Noncash Income (Expense)	9	(1)
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	(4)	(18)
Increase (Decrease) in Inventories	45	30
Derivative collateral, net	0	2
Pension and other postretirement benefit plans	(7)	(5)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(96)	(74)
Accrued property, income and other taxes, net	143	(88)
Net cash flows from operating activities	654	403
Capital expenditures	(818)	(545)
Purchases of marketable securities	(147)	(81)
Proceeds from sales of marketable securities	125	77
Other, net	27	(5)
Net cash flows from investing activities	(813)	(554)
Proceeds from Issuance of Long-term Debt	687	843
Repayments of BHE senior debt and junior subordinated debentures	(350)	(255)
Increase (Decrease) in Notes Payable, Related Parties, Current	(3)	10
Net (repayments of) proceeds from short-term debt	0	(99)
Net cash flows from financing activities	334	499
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	175	348
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	457	$ 375
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 370

XML 69 R31.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Changes in regulatory assets and liabilities	206	21
Other Noncash Income (Expense)	26	8
Trade receivables and other assets	(226)	(73)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Acquisitions, net of cash acquired		(588)
Payments for (Proceeds from) Other Investing Activities	(43)	6
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	64	87
Other Nonrecurring (Income) Expense	0	(1)
Utilities Operating Expense, Depreciation and Amortization	168	154
Allowance for equity funds	(1)	(1)
Deferred income taxes and amortization of investment tax credits	(14)	34
Changes in regulatory assets and liabilities	28	13
Deferred Energy Change	25	(25)
Amortization of Deferred Charges	7	7
Other Noncash Income (Expense)	9	(2)
Trade receivables and other assets	(62)	(88)
Increase (Decrease) in Inventories	1	7
Accrued property, income and other taxes, net	12	18
Accounts payable and other liabilities	13	48
Net cash flows from operating activities	250	251
Capital expenditures	(135)	(139)
Acquisitions, net of cash acquired	0	(77)
Payments for (Proceeds from) Other Investing Activities	(1)	(4)
Net cash flows from investing activities	(134)	(212)
Proceeds from Issuance of Long-term Debt	573	91
Repayments of BHE senior debt and junior subordinated debentures	(332)	(81)
Payments of Ordinary Dividends, Common Stock	0	(322)
Net cash flows from financing activities	241	(312)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	357	(273)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	66	290
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 423	$ 17

XML 70 R32.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Changes in regulatory assets and liabilities	206	21
Other Noncash Income (Expense)	(26)	(8)
Trade receivables and other assets	(226)	(73)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	41	41
Utilities Operating Expense, Depreciation and Amortization	59	56
Allowance for equity funds	(2)	(1)
Deferred income taxes and amortization of investment tax credits	2	23
Changes in regulatory assets and liabilities	19	7
Deferred Energy Change	26	(20)
Amortization of Deferred Charges	(5)	(34)
Other Noncash Income (Expense)	0	1
Trade receivables and other assets	21	23
Accrued property, income and other taxes, net	11	1
Accounts payable and other liabilities	(10)	(54)
Net cash flows from operating activities	162	41
Capital expenditures	(94)	(87)
Net cash flows from investing activities	(94)	(87)
Repayments of BHE senior debt and junior subordinated debentures	(1)	(1)
Payments of Ordinary Dividends, Common Stock	0	(5)
Net cash flows from financing activities	(1)	(6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	67	(52)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	8	60
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 75	$ 8

XML 71 R33.htm IDEA: XBRL DOCUMENT

General	6 Months Ended
General	Jun. 30, 2018
Segment Reporting Information [Line Items]
General/Organization and Operations	General Berkshire Hathaway Energy Company ("BHE") is a holding company that owns a highly diversified portfolio of locally managed businesses principally engaged in the energy industry (collectively with its subsidiaries, the "Company") and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The Company's operations are organized as eight business segments: PacifiCorp, MidAmerican Funding, LLC ("MidAmerican Funding") (which primarily consists of MidAmerican Energy Company ("MidAmerican Energy")), NV Energy, Inc. ("NV Energy") (which primarily consists of Nevada Power Company ("Nevada Power") and Sierra Pacific Power Company ("Sierra Pacific")), Northern Powergrid Holdings Company ("Northern Powergrid") (which primarily consists of Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc), BHE Pipeline Group (which consists of Northern Natural Gas Company ("Northern Natural Gas") and Kern River Gas Transmission Company ("Kern River")), BHE Transmission (which consists of BHE Canada Holdings Corporation ("AltaLink") (which primarily consists of AltaLink, L.P. ("ALP")) and BHE U.S. Transmission, LLC), BHE Renewables (which primarily consists of BHE Renewables, LLC and CalEnergy Philippines) and HomeServices of America, Inc. (collectively with its subsidiaries, "HomeServices"). The Company, through these locally managed and operated businesses, owns four utility companies in the United States serving customers in 11 states, two electricity distribution companies in Great Britain, two interstate natural gas pipeline companies in the United States, an electric transmission business in Canada, interests in electric transmission businesses in the United States, a renewable energy business primarily investing in solar, wind, geothermal and hydroelectric projects, the second largest residential real estate brokerage firm in the United States and one of the largest residential real estate brokerage franchise networks in the United States. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of June 30, 2018 and for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in the Company's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.
PacifiCorp [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General PacifiCorp, which includes PacifiCorp and its subsidiaries, is a United States regulated electric utility company serving retail customers, including residential, commercial, industrial, irrigation and other customers in portions of Utah, Oregon, Wyoming, Washington, Idaho and California. PacifiCorp owns, or has interests in, a number of thermal, hydroelectric, wind-powered and geothermal generating facilities, as well as electric transmission and distribution assets. PacifiCorp also buys and sells electricity on the wholesale market with other utilities, energy marketing companies, financial institutions and other market participants. PacifiCorp is subject to comprehensive state and federal regulation. PacifiCorp's subsidiaries support its electric utility operations by providing coal mining services. PacifiCorp is an indirect subsidiary of Berkshire Hathaway Energy Company ("BHE"), a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of June 30, 2018 and for the three- and six-month periods ended June 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018 and 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in PacifiCorp's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in PacifiCorp's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General MidAmerican Energy Company ("MidAmerican Energy") is a public utility with electric and natural gas operations and is the principal subsidiary of MHC Inc. ("MHC"). MHC is a holding company that conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's nonregulated subsidiaries include Midwest Capital Group, Inc. and MEC Construction Services Co. MHC is the direct, wholly owned subsidiary of MidAmerican Funding, LLC ("MidAmerican Funding"), which is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Financial Statements as of June 30, 2018, and for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018, are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Financial Statements. Note 2 of Notes to Financial Statements included in MidAmerican Energy's Annual Report on Form 10-K for the year ended December 31, 2017, describes the most significant accounting policies used in the preparation of the unaudited Financial Statements. There have been no significant changes in MidAmerican Energy's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
General/Organization and Operations	General MidAmerican Funding, LLC ("MidAmerican Funding") is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). MidAmerican Funding's direct, wholly owned subsidiary is MHC Inc. ("MHC"), which constitutes substantially all of MidAmerican Funding's assets, liabilities and business activities except those related to MidAmerican Funding's long-term debt securities. MHC conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's principal subsidiary is MidAmerican Energy Company ("MidAmerican Energy"), a public utility with electric and natural gas operations. Direct, wholly owned nonregulated subsidiaries of MHC are Midwest Capital Group, Inc. and MEC Construction Services Co. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of June 30, 2018, and for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018, are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in MidAmerican Funding's Annual Report on Form 10-K for the year ended December 31, 2017, describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in MidAmerican Funding's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.
Nevada Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General Nevada Power Company, together with its subsidiaries ("Nevada Power"), is a wholly owned subsidiary of NV Energy, Inc. ("NV Energy"), a holding company that also owns Sierra Pacific Power Company ("Sierra Pacific") and certain other subsidiaries. Nevada Power is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers, primarily in the Las Vegas, North Las Vegas, Henderson and adjoining areas. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company ("BHE"). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of June 30, 2018 and for the three- and six-month periods ended June 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Nevada Power's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Nevada Power's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General Sierra Pacific Power Company, together with its subsidiaries ("Sierra Pacific"), is a wholly owned subsidiary of NV Energy, Inc. ("NV Energy"), a holding company that also owns Nevada Power Company ("Nevada Power") and certain other subsidiaries. Sierra Pacific is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers and regulated retail natural gas customers primarily in northern Nevada. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company ("BHE"). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of June 30, 2018 and for the three- and six-month periods ended June 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and six-month periods ended June 30, 2018 and 2017. The results of operations for the three- and six-month periods ended June 30, 2018 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Sierra Pacific's Annual Report on Form 10-K for the year ended December 31, 2017 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Sierra Pacific's assumptions regarding significant accounting estimates and policies during the six-month period ended June 30, 2018.

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New Accounting Pronouncements	6 Months Ended
New Accounting Pronouncements	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-02, which amends FASB Accounting Standards Codification ("ASC") Topic 220, "Income Statement - Reporting Comprehensive Income." The amendments in this guidance require a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects that were created from the Tax Cuts and Jobs Act enacted on December 22, 2017 ("2017 Tax Reform"). The reclassification is the difference between the historical income tax rates and the enacted rate for the items previously recorded in accumulated other comprehensive income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted retrospectively to each period in which the effect of the change in 2017 Tax Reform is recognized. Considering the significant components of the Company's accumulated other comprehensive income relate to (a) unrecognized amounts on retirement benefits of foreign pension plans and (b) unrealized gains on available-for-sale securities, which were reclassified as required by ASU No. 2016-01 that was adopted on January 1, 2018, the adoption of ASU No. 2018-02 will not have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, which amends FASB ASC Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity's ability to hedge non-financial and financial risk components and reduces complexity in fair value hedges of interest rate risk. In addition, it eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item and also eases certain documentation and assessment requirements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The Company is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. The Company plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("ASC") Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("ASC") Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy plans to adopt this guidance effective January 1, 2019, and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements.
MidAmerican Funding, LLC and Subsidiaries [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements Refer to Note 2 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("ASC") Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("ASC") Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. In January 2018, the FASB issued ASU No. 2018-01 that provides for an optional transition practical expedient allowing companies to not have to evaluate existing land easements if they were not previously accounted for under ASC Topic 840, "Leases." This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.

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Business Acquisitions (Notes)	6 Months Ended
Business Acquisitions (Notes)	Jun. 30, 2018
Business Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Business Acquisitions The Company completed various acquisitions totaling $107 million, net of cash acquired, for the six-month period ended June 30, 2018. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses. There were no other material assets acquired or liabilities assumed. Additionally, in April 2018, HomeServices acquired the remaining 33.3% interest in a real estate brokerage franchise business from the noncontrolling interest member at a contractually determined option exercise price totaling $131 million. The Company completed various acquisitions totaling $588 million, net of cash acquired, for the six-month period ended June 30, 2017. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to development and construction costs for the 110-megawatt Alamo 6 solar-powered generation project, the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power and a residential real estate brokerage business. There were no other material assets acquired or liabilities assumed.

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Investments and Restricted Cash and Investments

6 Months Ended

Jun. 30, 2018

Restricted Cash and Cash Equivalents Items [Line Items]

Investments and Restricted Cash and Investments

Investments and Restricted Cash and Cash Equivalents and Investments

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



	As of
	June 30,		December 31,
	2018		2017
Investments:
BYD Company Limited common stock	$	1,364	$	1,961
Rabbi trusts	387		441
Other	186		124
Total investments	1,937		2,526

Equity method investments:
BHE Renewables tax equity investments	1,159		1,025
Electric Transmission Texas, LLC	535		524
Bridger Coal Company	124		137
Other	149		148
Total equity method investments	1,967		1,834

Restricted cash and cash equivalents and investments:
Quad Cities Station nuclear decommissioning trust funds	522		515
Restricted cash and cash equivalents	320		348
Total restricted cash and cash equivalents and investments	842		863

Total investments and restricted cash and cash equivalents and investments	$	4,746	$	5,223

Reflected as:
Current assets	$	342	$	351
Noncurrent assets	4,404		4,872
Total investments and restricted cash and cash equivalents and investments	$	4,746	$	5,223

Investments

The portion of unrealized losses related to investments still held as of June 30, 2018 is calculated as follows (in millions):



	Three-Month Period			Six-Month Period
	Ended June 30,			Ended June 30,
	2018			2018
Losses on marketable securities recognized during the period	$	(387	)	$	(596	)
Less: Net (losses) gains recognized during the period on marketable securities sold during the period	(1		)	1
Unrealized losses recognized during the period on marketable securities still held at the reporting date	$	(386	)	$	(597	)

Equity Method Investments

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	1,224	$	935
Restricted cash and cash equivalents	297		327
Investments and restricted cash and cash equivalents and investments	23		21
Total cash and cash equivalents and restricted cash and cash equivalents	$	1,544	$	1,283

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Property, Plant and Equipment, Net

6 Months Ended

Jun. 30, 2018

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



		As of
	Depreciable	June 30,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	74,975		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,240			7,176
		82,215			81,836
Accumulated depreciation and amortization		(25,155		)	(24,478		)
Regulated assets, net		57,060			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,553			6,010
Other assets	3-30 years	1,589			1,489
		8,142			7,499
Accumulated depreciation and amortization		(1,697		)	(1,542		)
Nonregulated assets, net		6,445			5,957

Net operating assets		63,505			63,315
Construction work-in-progress		3,204			2,556
Property, plant and equipment, net		$	66,709		$	65,871

Construction work-in-progress includes $2.8 billion as of June 30, 2018 and $2.2 billion as of December 31, 2017, related to the construction of regulated assets.

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,102		$	12,107
Transmission	52-75 years	1,858			1,838
Electric distribution	20-75 years	3,463			3,380
Gas distribution	29-75 years	1,671			1,640
Utility plant in service		19,094			18,965
Accumulated depreciation and amortization		(5,731		)	(5,561		)
Utility plant in service, net		13,363			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,369			13,410
Construction work-in-progress		1,303			797
Property, plant and equipment, net		$	14,672		$	14,207

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	28,106		$	27,880
Accumulated depreciation and amortization		(9,613		)	(9,366		)
Utility plant in-service, net		18,493			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	11			11
Plant, net		18,504			18,525
Construction work-in-progress		788			678
Property, plant and equipment, net		$	19,292		$	19,203

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,713		$	3,707
Distribution	20 - 65 years	3,352			3,314
Transmission	45 - 70 years	1,861			1,860
General and intangible plant	5 - 65 years	811			793
Utility plant		9,737			9,674
Accumulated depreciation and amortization		(2,984		)	(2,871		)
Utility plant, net		6,753			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	1			1
Plant, net		6,754			6,804
Construction work-in-progress		80			73
Property, plant and equipment, net		$	6,834		$	6,877

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,144		$	1,144
Electric distribution	20 - 100 years	1,506			1,459
Electric transmission	50 - 100 years	818			786
Electric general and intangible plant	5 - 70 years	190			181
Natural gas distribution	35 - 70 years	396			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	303			294
Utility plant		4,371			4,268
Accumulated depreciation and amortization		(1,553		)	(1,513		)
Utility plant, net		2,818			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,823			2,760
Construction work-in-progress		100			132
Property, plant and equipment, net		$	2,923		$	2,892

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Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2018
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Retail Regulated Rates The Tax Cuts and Jobs Act enacted on December 22, 2017 ("2017 Tax Reform") enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the U.S. federal corporate income tax rate from 35% to 21%. PacifiCorp has agreed to defer the impact of the tax law change with each of its state regulatory bodies. PacifiCorp proposed reducing customer rates for a portion of the lower annual income tax expense resulting from the decrease in federal tax rates and deferring the remainder to offset other costs as approved by the regulatory bodies. In March 2018, PacifiCorp proposed 1% rate reductions in Utah, Wyoming and Idaho. PacifiCorp proposed the rate reductions to be effective May 1, 2018 in Utah, July 1, 2018 in Wyoming and June 1, 2018 in Idaho. In April 2018, the Utah Public Service Commission ("UPSC") ordered a rate reduction of $61 million, or 3.1%, effective May 1, 2018, through December 31, 2018, based on a preliminary estimate of the revenue requirement impact of 2017 Tax Reform. This credit will likely be adjusted effective January 1, 2019, when the final rates are approved in the next phase of the proceeding later in 2018. PacifiCorp filed a partial settlement with the Wyoming Public Service Commission ("WPSC") in April 2018 that provides a rate reduction of $26 million, or 3.8%, beginning July 1, 2018, with the remaining tax savings to be deferred to offset other costs. In June 2018, the WPSC approved the rate reduction on an interim basis. In May 2018, the Idaho Public Utility Commission ("IPUC") approved an all-party settlement to implement a rate reduction of $8 million, or 3.0%, beginning June 1, 2018, to begin passing back a portion of the tax benefit. The credit may be adjusted following the next phase of the proceeding. In June 2018, PacifiCorp filed reports with the UPSC, WPSC and IPUC with the calculation of the full impact of the tax law change on revenue requirements. These reports will initiate the next phase of the proceedings in these states. As of June 30, 2018, the estimated potential refund liability attributable to lower customer rates enabled by the benefits of tax reform was $88 million.
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 and energy in future time periods. Regulatory Rate Review In June 2017, Nevada Power filed an electric regulatory rate review with the PUCN. The filing supported an annual revenue increase of $29 million, or 2%, but requested no incremental annual revenue relief. In December 2017, the PUCN issued an order which reduced Nevada Power's revenue requirement by $26 million and requires Nevada Power to share 50% of regulatory earnings above 9.7%. As a result of the order, Nevada Power recorded expense of $28 million in December 2017 primarily due to the reduction of a regulatory asset to return to customers revenue collected for costs not incurred. The new rates were effective on February 15, 2018. In January 2018, Nevada Power filed a petition for clarification of certain findings and directives in the order and intervening parties filed motions for reconsideration. The PUCN has not yet ruled on the filed motions. Nevada Power cannot predict the timing or ultimate outcome of the PUCN rulings. The Tax Cuts and Jobs Act ("2017 Tax Reform") enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the U.S. federal corporate income tax rate from 35% to 21%. In February 2018, Nevada Power made a filing with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from 2017 Tax Reform for 2018 and beyond. The filing supports an annual rate reduction of $59 million. In March 2018, the PUCN issued an order approving the rate reduction proposed by Nevada Power. The new rates were effective April 1, 2018. The order has extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. Nevada Power cannot predict the timing or ultimate outcome of further regulatory proceedings. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In October 2016, Wynn became a distribution only service customer and started procuring energy from another energy supplier. In April 2017, Wynn filed a motion with the PUCN seeking relief from the January 2016 order that established the impact fee that was paid in September 2016 and requested the PUCN adopt an alternative impact fee and revise on-going charges associated with retirement of assets and high cost renewable contracts. This request is still pending. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Nevada Power, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Nevada Power. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Nevada Power. In February 2018, Caesars became a distribution only service customer and started procuring energy from another energy supplier. Following the PUCN’s order from March 2017, Caesars’ will pay an impact fee of $44 million in 72 equal monthly payments.
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel and energy in future time periods. Regulatory Rate Review The Tax Cuts and Jobs Act ("2017 Tax Reform") enacted significant changes to the Internal Revenue Code, including, among other things, a reduction in the U.S. federal corporate income tax rate from 35% to 21%. In February 2018, Sierra Pacific made a filing with the PUCN proposing a tax rate reduction rider for the lower annual income tax expense anticipated to result from 2017 Tax Reform for 2018 and beyond. The filing supports an annual rate reduction of $25 million. In March 2018, the PUCN issued an order approving the rate reduction proposed by Sierra Pacific, The new rates were effective April 1, 2018. The order has extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. Sierra Pacific cannot predict the timing or ultimate outcome of further regulatory proceedings. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt ("MW") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Sierra Pacific. In January 2018, Caesars became a distribution only service customer and started procuring energy from another energy supplier for its eligible meters in the Sierra Pacific service territory. Following the PUCN’s order from March 2017, Caesars’ will pay an impact fee of $4 million in 36 monthly payments. In May 2017, Peppermill Resort Spa Casino ("Peppermill"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In August 2017, the PUCN approved a stipulation allowing Peppermill to purchase energy from alternative providers subject to conditions, including paying an impact fee. In September 2017, Peppermill provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In April 2018, Peppermill paid a one-time impact fee of $3 million and became a distribution only service customer and started procuring energy from another energy supplier.

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Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures (Notes)

6 Months Ended

Jun. 30, 2018

Condensed Cash Flow Statements, Captions [Line Items]


(3)	Cash and Cash Equivalents and Restricted Cash and Cash Equivalents

Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist of funds restricted by the Public Utilities Commission of Nevada ("PUCN") for a certain renewable energy contract. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions):



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	71	$	4
Restricted cash and cash equivalents included in other current assets	4		4
Total cash and cash equivalents and restricted cash and cash equivalents	$	75	$	8

Condensed Cash Flow Statements, Captions [Line Items]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents

Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist of funds restricted by the Public Utilities Commission of Nevada ("PUCN") for a certain renewable energy contract. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions):



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	416	$	57
Restricted cash and cash equivalents included in other current assets	7		9
Total cash and cash equivalents and restricted cash and cash equivalents	$	423	$	66

Condensed Cash Flow Statements, Captions [Line Items]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	22	$	14
Restricted cash included in other current assets	13		13
Restricted cash included in other assets	2		2
Total cash and cash equivalents and restricted cash and cash equivalents	$	37	$	29

Equity Method Investments

In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. PacifiCorp adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $14 million previously recognized within investing cash flows to operating cash flows for the six-month period ended June 30, 2017.

Condensed Cash Flow Statements, Captions [Line Items]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents

Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions):



	As of
	June 30		December 31
	2018		2017

Cash and cash equivalents	$	370	$	172
Restricted cash and cash equivalents in other current assets	87		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	457	$	282

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents

Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements. A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Balance Sheets (in millions):



	As of
	June 30,		December 31
	2018		2017

Cash and cash equivalents	$	369	$	172
Restricted cash and cash equivalents in other current assets	87		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	456	$	282

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Recent Financing Transactions	6 Months Ended
Recent Financing Transactions	Jun. 30, 2018
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In July 2018, BHE issued $1.0 billion of its 4.45% Senior Notes due 2049. BHE used the net proceeds to refinance a portion of the Company's short-term indebtedness and for general corporate purposes. In July 2018, Northern Natural Gas issued $450 million of its 4.30% Senior Bonds due 2049. Northern Natural Gas used the net proceeds to repay at maturity all of its $200 million 5.75% Senior Notes due July 2018 and for general corporate purposes. In July 2018, PacifiCorp issued $600 million of its 4.125% First Mortgage Bonds due 2049. PacifiCorp used a portion of the net proceeds to repay all of its $500 million 5.65% First Mortgage Bonds due July 2018 and intends to use the remaining net proceeds to fund capital expenditures and for general corporate purposes. In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power used a portion of the net proceeds to repay all of its $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018. In August 2018, Nevada Power used the remaining net proceeds, together with available cash, to repay all of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018. In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In January 2018, BHE issued $450 million of its 2.375% Senior Notes due 2021, $400 million of its 2.80% Senior Notes due 2023, $600 million of its 3.25% Senior Notes due 2028 and $750 million of its 3.80% Senior Notes due 2048. The net proceeds were used to refinance a portion of the Company's short-term indebtedness and for general corporate purposes. Credit Facilities In April 2018, BHE terminated its $1.0 billion unsecured credit facility expiring May 2018 and amended and restated, with lender consent, its existing $2.0 billion unsecured credit facility expiring June 2020, increasing the lender commitment to $3.5 billion, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp and MidAmerican Energy amended and restated their existing $600 million and $900 million unsecured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, Nevada Power and Sierra Pacific amended and restated their existing $400 million and $250 million secured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, ALP amended its existing C$750 million secured credit facility expiring December 2019, decreasing the lender commitment to C$500 million effective December 2018 and extending the expiration date to December 2022. ALP also amended its C$75 million secured credit facility expiring December 2019, extending the expiration date to December 2022.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power used a portion of the net proceeds to repay all of Nevada Power's $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018. In August 2018, Nevada Power used the remaining net proceeds, together with available cash, to repay all of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018. Credit Facilities In April 2018, Nevada Power amended and restated its existing $400 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In July 2018, PacifiCorp issued $600 million of its 4.125% First Mortgage Bonds due 2049. PacifiCorp used a portion of the net proceeds to repay all of PacifiCorp's $500 million 5.65% First Mortgage Bonds due July 2018 and intends to use the remaining net proceeds to fund capital expenditures and for general corporate purposes. Credit Facilities In April 2018, PacifiCorp amended and restated, its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated, its existing $600 million unsecured credit facility expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In March 2018, MidAmerican Energy repaid $350 million of its 5.30% Senior Notes due March 2018. Credit Facilities In April 2018, MidAmerican Energy amended and restated its existing $900 million unsecured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Refer to Note 5 of MidAmerican Energy's Notes to Financial Statements.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Credit Facilities In April 2018, Sierra Pacific amended and restated its existing $250 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(78	)	(19	)	(58	)	(17	)
State income tax, net of federal income tax benefit	(19	)	1		(25	)	(2	)
Income tax effect of foreign income	(4	)	(5	)	(11	)	(5	)
Effects of ratemaking	(8	)	—		(8	)	—
Equity income	1		1		1		1
Other, net	1		—		(1	)	(1	)
Effective income tax rate	(86	)%	13	%	(81	)%	11	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]


	Income Taxes

Tax Cuts and Jobs Act

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. PacifiCorp has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of the interpretations of the bonus depreciation rules. PacifiCorp has determined the amounts recorded and the interpretations relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. PacifiCorp believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. During the three- and six-month periods ended June 30, 2018, PacifiCorp did not make material revisions to its previous calculations.

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows:



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
State income tax, net of federal income tax benefit	4		3		4		3
Federal income tax credits	(5	)	(5	)	(5	)	(5	)
Effects of ratemaking	(4	)	1		(4	)	1
Other	(3	)	(2	)	(2	)	(2	)
Effective income tax rate	13	%	32	%	14	%	32	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Income Taxes

Tax Cuts and Jobs Act

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 118 to assist in the implementation process of 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. Sierra Pacific has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. Sierra Pacific has determined the amounts recorded and the interpretations relating to this items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Sierra Pacific believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018.

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows:



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Effects of ratemaking	14		—		(1	)	—
Nondeductible expenses	8		—		3		—
Other	3		—		—		—
Effective income tax rate	46	%	35	%	23	%	35	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(80	)	(67	)	(104	)	(73	)
State income tax, net of federal income tax benefit	(7	)	(4	)	(8	)	(2	)
Effects of ratemaking	(9	)	(5	)	(13	)	(7	)
Other, net	(2	)	—		—		—
Effective income tax rate	(77	)%	(41	)%	(104	)%	(47	)%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(86	)	(71	)	(113	)	(78	)
State income tax, net of federal income tax benefit	(8	)	(5	)	(9	)	(2	)
Effects of ratemaking	(10	)	(5	)	(14	)	(8	)
Other, net	(1	)	—		—		—
Effective income tax rate	(84	)%	(46	)%	(115	)%	(53	)%

Berkshire Hathaway includes BHE and subsidiaries in its United States federal and Iowa state income tax returns. Consistent with established regulatory practice, MidAmerican Funding's and MidAmerican Energy's provisions for income tax have been computed on a stand-alone basis, and substantially all of their currently payable or receivable income tax is remitted to or received from BHE. MidAmerican Funding received net cash payments for income tax from BHE totaling $234 million and $8 million for the six-month periods ended June 30, 2018 and 2017, respectively.

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Employee Benefit Plans

6 Months Ended

Jun. 30, 2018

Domestic Operations

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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Pension:
Service cost	$	5		$	6		$	10		$	12
Interest cost	26			29			52			58
Expected return on plan assets	(41		)	(40		)	(82		)	(80		)
Net amortization	7			8			15			15
Net periodic benefit (credit) cost	$	(3	)	$	3		$	(5	)	$	5

Other postretirement:
Service cost	$	3		$	2		$	5		$	4
Interest cost	6			8			12			14
Expected return on plan assets	(12		)	(11		)	(22		)	(21		)
Net amortization	(3		)	(4		)	(6		)	(7		)
Net periodic benefit credit	$	(6	)	$	(5	)	$	(11	)	$	(10	)

Foreign Operations

Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Service cost	$	5		$	7		$	10		$	13
Interest cost	14			15			28			29
Expected return on plan assets	(26		)	(25		)	(53		)	(49		)
Settlement	24			—			24			—
Net amortization	14			16			29			33
Net periodic benefit cost	$	31		$	13		$	38		$	26


	Employee Benefit Plans

In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. PacifiCorp adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Consolidated Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Consolidated Statements of Operations utilizing the practical expedient to use the amounts previously disclosed in the Notes to Consolidated Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, amounts other than the service cost for pension and other postretirement benefit plans for the three- and six-month periods ended June 30, 2017 of $5 million and $11 million, respectively, have been reclassified to Other, net in the Consolidated Statements of Operations.

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



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017
Pension:
Service cost	—		—		—		—
Interest cost	10		13		21		25
Expected return on plan assets	(18	)	(18	)	(36	)	(36	)
Net amortization	4		3		7		7
Net periodic benefit credit	(4	)	(2	)	(8	)	(4	)

Other postretirement:
Service cost	1		—		1		1
Interest cost	3		4		6		7
Expected return on plan assets	(6	)	(5	)	(11	)	(11	)
Net amortization	(2	)	(2	)	(3	)	(3	)
Net periodic benefit credit	(4	)	(3	)	(7	)	(6	)

Amounts other than the service cost for pension and other postretirement benefit plans are recorded in Other, net in the Consolidated Statements of Operations. Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $- million, respectively, during 2018. As of June 30, 2018, $2 million and $- million of contributions had been made to the pension and other postretirement benefit plans, respectively.

In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. MidAmerican Energy adopted this guidance January 1, 2018 prospectively for the capitalization of the service cost component in the Balance Sheets and retrospectively for the presentation of the service cost component and the other components of net benefit cost in the Statements of Operations, applying the practical expedient to use the amounts previously disclosed in the Notes to Financial Statements as the estimation basis for applying the retrospective presentation requirement. As a result, for the three- and six-month periods ended June 30, 2017, amounts other than the service cost for pension and other postretirement benefit plans totaling $6 million and $11 million have been reclassified to other, net in the Statements of Operations of the participating subsidiaries, of which $5 million and $10 million, respectively, relates to MidAmerican Energy.

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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Pension:
Service cost	$	2		$	3		$	4		$	5
Interest cost	7			7			14			15
Expected return on plan assets	(11		)	(11		)	(22		)	(22		)
Net amortization	—			1			1			1
Net periodic benefit credit	$	(2	)	$	—		$	(3	)	$	(1	)

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

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

Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):



	As of
	June 30,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(23	)	$	(23	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(10		)	(10		)

Other Postretirement Plans -
Other assets	1			—
Other long-term liabilities	—			1

Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):



	As of
	June 30,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(1	)	$	(2	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(8		)	(8		)

Other Postretirement Plans -
Other long-term liabilities	(14		)	(20		)

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Asset Retirement Obligation Asset Retirement Obligations (Notes)	6 Months Ended
	Jun. 30, 2018
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Text Block]	Asset Retirement Obligations In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy concluded in March 2018 that it will discontinue sending CCR to surface impoundments effective April 2018 and remove all CCR material located below the water table in such facilities, the latter of which is a more extensive closure activity than previously assumed. The incremental cost and timing of such actions is not currently reasonably determinable, but an evaluation of such estimates is expected to be completed in the third quarter of 2018, with any necessary adjustments to the related asset retirement obligations recognized at that time.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Text Block]	Asset Retirement Obligations Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements.

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Risk Management and Hedging Activities

6 Months Ended

Jun. 30, 2018

Risk Management and Hedging Activities

Derivative [Line Items]


	Risk Management and Hedging Activities

There have been no significant changes in PacifiCorp'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 June 30, 2018
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	12		$	1	$	6		$	—		$	19
Commodity liabilities	(6		)	—		(42		)	(90		)	(138		)
Total	6			1		(36		)	(90		)	(119		)

Total derivatives	6			1		(36		)	(90		)	(119		)
Cash collateral receivable	—			—		19			58			77
Total derivatives - net basis	$	6		$	1	$	(17	)	$	(32	)	$	(42	)

As of December 31, 2017
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	11		$	1	$	1		$	—		$	13
Commodity liabilities	(3		)	—		(32		)	(82		)	(117		)
Total	8			1		(31		)	(82		)	(104		)

Total derivatives	8			1		(31		)	(82		)	(104		)
Cash collateral receivable	—			—		17			57			74
Total derivatives - net basis	$	8		$	1	$	(14	)	$	(25	)	$	(30	)


(1)	PacifiCorp's commodity derivatives are generally included in rates and as of June 30, 2018 and December 31, 2017, a regulatory asset of $116 million and $101 million, respectively, was recorded related to the net derivative liability of $119 million and $104 million, respectively.



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	122		$	103		$	101		$	73
Changes in fair value recognized in net regulatory assets	6			6			34			30
Net (losses) gains reclassified to operating revenue	(1		)	1			6			13
Net losses reclassified to cost of fuel and energy	(11		)	(15		)	(25		)	(21		)
Ending balance	$	116		$	95		$	116		$	95

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	June 30,		December 31,
	Measure	2018		2017

Electricity sales	Megawatt hours	(6	)	(9	)
Natural gas purchases	Decatherms	119		113
Fuel oil purchases	Gallons	5		—

Credit Risk

Collateral and Contingent Features

XML 83 R45.htm IDEA: XBRL DOCUMENT

Fair Value Measurements

6 Months Ended

Jun. 30, 2018

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 June 30, 2018
Assets:
Commodity derivatives	$	—	$	46		$	101		$	(33	)	$	114
Interest rate derivatives	1		17			17			—			35
Mortgage loans held for sale	—		763			—			—			763
Money market mutual funds⁽²⁾	600		—			—			—			600
Debt securities:
United States government obligations	184		—			—			—			184
International government obligations	—		4			—			—			4
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	289		—			—			—			289
International companies	1,370		—			—			—			1,370
Investment funds	187		—			—			—			187
	$	2,631	$	868		$	118		$	(33	)	$	3,584
Liabilities:
Commodity derivatives	$	—	$	(184	)	$	(18	)	$	117		$	(85	)
Interest rate derivatives	—		(8		)	—			—			(8		)
	$	—	$	(192	)	$	(18	)	$	117		$	(93	)



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2017
Assets:
Commodity derivatives	$	1		$	42		$	104		$	(29	)	$	118
Interest rate derivatives	—			15			9			—			24
Mortgage loans held for sale	—			465			—			—			465
Money market mutual funds⁽²⁾	685			—			—			—			685
Debt securities:
United States government obligations	176			—			—			—			176
International government obligations	—			5			—			—			5
Corporate obligations	—			36			—			—			36
Municipal obligations	—			2			—			—			2
Equity securities:
United States companies	288			—			—			—			288
International companies	1,968			—			—			—			1,968
Investment funds	178			—			—			—			178
	$	3,296		$	565		$	113		$	(29	)	$	3,945
Liabilities:
Commodity derivatives	$	(3	)	$	(167	)	$	(10	)	$	105		$	(75	)
Interest rate derivatives	—			(8		)	—			—			(8		)
	$	(3	)	$	(175	)	$	(10	)	$	105		$	(83	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $84 million and $76 million as of June 30, 2018 and December 31, 2017, respectively.


(2)	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

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						Six-Month Periods
	Ended June 30,						Ended June 30,
				Interest						Interest
	Commodity			Rate			Commodity			Rate
	Derivatives			Derivatives			Derivatives			Derivatives
2018:
Beginning balance	$	81		$	16		$	94		$	9
Changes included in earnings	4			56			4			86
Changes in fair value recognized in OCI	1			—			—			—
Changes in fair value recognized in net regulatory assets	(5		)	—			(14		)	—
Purchases	—			—			1			—
Settlements	2			(55		)	(2		)	(78		)
Ending balance	$	83		$	17		$	83		$	17



2017:
Beginning balance	$	72		$	9		$	60		$	6
Changes included in earnings	—			39			12			66
Changes in fair value recognized in OCI	—			—			(2		)	—
Changes in fair value recognized in net regulatory assets	(3		)	—			(2		)	—
Purchases	1			—			1			(2		)
Settlements	11			(40		)	12			(62		)
Ending balance	$	81		$	8		$	81		$	8



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	36,707	$	40,139	$	35,193	$	40,522

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 June 30, 2018
Assets:
Commodity derivatives	$	—	$	19		$	—	$	(12	)	$	7
Money market mutual funds⁽²⁾	21		—			—		—			21
Investment funds	25		—			—		—			25
	$	46	$	19		$	—	$	(12	)	$	53

Liabilities - Commodity derivatives	$	—	$	(138	)	$	—	$	89		$	(49	)

As of December 31, 2017
Assets:
Commodity derivatives	$	—	$	13		$	—	$	(4	)	$	9
Money market mutual funds⁽²⁾	21		—			—		—			21
Investment funds	21		—			—		—			21
	$	42	$	13		$	—	$	(4	)	$	51

Liabilities - Commodity derivatives	$	—	$	(117	)	$	—	$	78		$	(39	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $77 million and $74 million as of June 30, 2018 and December 31, 2017, respectively.


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

Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which PacifiCorp transacts. When quoted prices for identical contracts are not available, PacifiCorp uses forward price curves. Forward price curves represent PacifiCorp's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. PacifiCorp bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent energy brokers, exchanges, direct communication with market participants and actual transactions executed by PacifiCorp. Market price quotations for certain major electricity and natural gas trading hubs are generally readily obtainable for the first six years; therefore, PacifiCorp's forward price curves for those locations and periods reflect observable market quotes. Market price quotations for other electricity and natural gas trading hubs are not as readily obtainable for the first six years. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, PacifiCorp uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. Refer to Note 9 for further discussion regarding PacifiCorp's risk management and hedging activities.



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	6,920	$	7,849	$	7,005	$	8,370

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

air Value Measurements


•	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 June 30, 2018:
Assets:
Commodity derivatives	$	—	$	2		$	1		$	(1	)	$	2
Money market mutual funds⁽²⁾	346		—			—			—			346
Debt securities:
United States government obligations	184		—			—			—			184
International government obligations	—		4			—			—			4
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	289		—			—			—			289
International companies	6		—			—			—			6
Investment funds	20		—			—			—			20
	$	845	$	44		$	1		$	(1	)	$	889

Liabilities - commodity derivatives	$	—	$	(7	)	$	(2	)	$	2		$	(7	)



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2017:
Assets:
Commodity derivatives	$	—	$	3		$	4		$	(2	)	$	5
Money market mutual funds⁽²⁾	133		—			—			—			133
Debt securities:
United States government obligations	176		—			—			—			176
International government obligations	—		5			—			—			5
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	288		—			—			—			288
International companies	7		—			—			—			7
Investment funds	15		—			—			—			15
	$	619	$	46		$	4		$	(2	)	$	667

Liabilities - commodity derivatives	$	—	$	(9	)	$	(1	)	$	2		$	(8	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $1 million and $- million as of June 30, 2018 and December 31, 2017, respectively.


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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	—		$	1		$	3		$	(2	)
Changes in fair value recognized in net regulatory assets	(1		)	(2		)	(3		)	—
Settlements	—			—			(1		)	1
Ending balance	$	(1	)	$	(1	)	$	(1	)	$	(1	)



	As of June 30, 2018				As of December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,380	$	5,653	$	5,042	$	5,686

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



	As of June 30, 2018				As of December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,620	$	5,953	$	5,282	$	6,006

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


•	Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Nevada Power has the ability to access at the measurement date.

•


•	Level 3 — Unobservable inputs reflect Nevada Power's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Nevada Power develops these inputs based on the best information available, including its own data.

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



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of June 30, 2018
Assets:
Money market mutual funds⁽¹⁾	$	25	$	—	$	—		$	25
Investment funds	1		—		—			1
	$	26	$	—	$	—		$	26

Liabilities - commodity derivatives	$	—	$	—	$	(9	)	$	(9	)

As of December 31, 2017
Assets - investment funds	$	2	$	—	$	—		$	2

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


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

Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which Nevada Power transacts. When quoted prices for identical contracts are not available, Nevada Power uses forward price curves. Forward price curves represent Nevada Power's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Nevada Power bases its forward price curves upon internally developed models, with internal and external fundamental data inputs. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to markets that are not active. Given that limited market data exists for these contracts, Nevada Power uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The model incorporates a mid-market pricing convention (the mid‑point price between bid and ask prices) as a practical expedient for valuing its assets and liabilities measured and reported at fair value. The determination of the fair value for derivative contracts not only includes counterparty risk, but also the impact of Nevada Power's nonperformance risk on its liabilities, which as of June 30, 2018 and December 31, 2017, had an immaterial impact to the fair value of its derivative contracts. As such, Nevada Power considers its derivative contracts to be valued using Level 3 inputs.



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	(8	)	$	(14	)	$	(3	)	$	(14	)
Changes in fair value recognized in regulatory assets	(3		)	(1		)	(8		)	(2		)
Settlements	2			11			2			12
Ending balance	$	(9	)	$	(4	)	$	(9	)	$	(4	)



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	2,850	$	3,196	$	2,600	$	3,088

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


•	Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Sierra Pacific has the ability to access at the measurement date.

•


•	Level 3 — Unobservable inputs reflect Sierra Pacific's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Sierra Pacific develops these inputs based on the best information available, including its own data.

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



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of June 30, 2018
Assets - money market mutual funds⁽¹⁾	$	40	$	—	$	—		$	40

Liabilities - commodity derivatives	$	—	$	—	$	(2	)	$	(2	)

As of December 31, 2017
Assets - investment funds	$	—	$	—	$	—		$	—


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

Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which Sierra Pacific transacts. When quoted prices for identical contracts are not available, Sierra Pacific uses forward price curves. Forward price curves represent Sierra Pacific's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Sierra Pacific bases its forward price curves upon internally developed models, with internal and external fundamental data inputs. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to markets that are not active. Given that limited market data exists for these contracts, Sierra Pacific uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The model incorporates a mid-market pricing convention (the mid‑point price between bid and ask prices) as a practical expedient for valuing its assets and liabilities measured and reported at fair value. The determination of the fair value for derivative contracts not only includes counterparty risk, but also the impact of Sierra Pacific's nonperformance risk on its liabilities, which as of June 30, 2018 and December 31, 2017, had an immaterial impact to the fair value of its derivative contracts. As such, Sierra Pacific considers its derivative contracts to be valued using Level 3 inputs.



	Three-Month Periods					Six-Month Periods
	Ended June 30,					Ended June 30,
	2018			2017		2018			2017

Beginning balance	$	(2	)	$	—	$	—		$	—
Changes in fair value recognized in regulatory assets	(1		)	—		(3		)	—
Settlements	1			—		1			—
Ending balance	$	(2	)	$	—	$	(2	)	$	—



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	1,120	$	1,168	$	1,120	$	1,221

- 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	6 Months Ended
Commitments and Contingencies	Jun. 30, 2018
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Easements During the six-month period ended June 30, 2018, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $283 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters The Company is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. The Company does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. The Company is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts and are described below. Environmental Laws and Regulations The Company is subject to federal, state, local and foreign laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact the Company's current and future operations. The Company believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the Federal Energy Regulatory Commission ("FERC"). In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Among other things, the KHSA provided that that United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. In April 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce) executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, in September 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC"), a private, independent nonprofit 501(c)(3) organization formed by certain signatories of the amended KSHA, jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also in September 2016, the KRRC filed an application with the FERC to surrender the license and decommission the same four facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. In March 2018, the FERC issued an order splitting the existing license for the Klamath Project into two licenses: the Klamath Project (P‑2082) contains East Side, West Side, Keno and Fall Creek developments; the new Lower Klamath Project (P‑14803) contains J.C. Boyle, Copco No. 1, Copco No. 2 and Iron Gate developments. In the same order, the FERC deferred consideration of the transfer of the license for the Lower Klamath facilities from PacifiCorp to the KRRC until some point in the future. PacifiCorp is currently the licensee for both the Klamath Project and Lower Klamath Project facilities and will retain ownership of the Klamath Project facilities after the approval and transfer of the Lower Klamath Project facilities. In April 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. In June 2018, the FERC granted PacifiCorp’s motion to stay the effective date of the Lower Klamath Project license and all related compliance obligations, pending a Commission order on the license transfer. Meanwhile, the FERC continues to assess the KRRC’s capacity to become a project licensee for purposes of dam removal. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million, of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees The Company has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on the Company's consolidated financial results.
PacifiCorp [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Commitments During the six-month period ended June 30, 2018, PacifiCorp entered into non-cancelable agreements totaling $613 million through 2021 for the repowering of certain existing wind facilities in Wyoming and Washington and supply of coal. Legal Matters PacifiCorp is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. PacifiCorp does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Environmental Laws and Regulations PacifiCorp is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact PacifiCorp's current and future operations. PacifiCorp believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the Federal Energy Regulatory Commission ("FERC"). In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Among other things, the KHSA provided that that United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would begin no earlier than 2020. Congress failed to pass legislation needed to implement the original KHSA. In April 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce) executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, in September 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC"), a private, independent nonprofit 501(c)(3) organization formed by certain signatories of the amended KSHA, jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also in September 2016, the KRRC filed an application with the FERC to surrender the license and decommission the same four facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. In March 2018, the FERC issued an order splitting the existing license for the Klamath Project into two licenses: the Klamath Project (P‑2082) contains East Side, West Side, Keno and Fall Creek developments; the new Lower Klamath Project (P‑14803) contains J.C. Boyle, Copco No. 1, Copco No. 2 and Iron Gate developments. In the same order, the FERC deferred consideration of the transfer of the license for the Lower Klamath facilities from PacifiCorp to the KRRC until some point in the future. PacifiCorp is currently the licensee for both the Klamath Project and Lower Klamath Project facilities and will retain ownership of the Klamath Project facilities after the approval and transfer of the Lower Klamath Project facilities. In April 2018, PacifiCorp filed a motion to stay the effective date of the license amendment until transfer is approved. In June 2018, the FERC granted PacifiCorp’s motion to stay the effective date of the Lower Klamath Project license and all related compliance obligations, pending a Commission order on the license transfer. Meanwhile, the FERC continues to assess the KRRC’s capacity to become a project licensee for purposes of dam removal. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million, of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees PacifiCorp has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on PacifiCorp's consolidated financial results.
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Easements During the six-month period ended June 30, 2018, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $283 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters MidAmerican Energy is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Energy does not believe that such normal and routine litigation will have a material impact on its financial results. Environmental Laws and Regulations MidAmerican Energy is subject to federal, state and local laws and regulations regarding air and water quality, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact its current and future operations. MidAmerican Energy believes it is in material compliance with all applicable laws and regulations. Transmission Rates MidAmerican Energy's wholesale transmission rates are set annually using FERC-approved formula rates subject to true-up for actual cost of service. Prior to September 2016, the rates in effect were based on a 12.38% return on equity ("ROE"). In November 2013 and February 2015, a coalition of intervenors filed successive complaints with the FERC requesting that the 12.38% ROE no longer be found just and reasonable and sought to reduce the base ROE to 9.15% and 8.67%, respectively. MidAmerican Energy is authorized by the FERC to include a 0.50% adder beyond the base ROE effective January 2015. In September 2016, the FERC issued an order for the first complaint, which reduces the base ROE to 10.32% and required 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 June 30, 2018, has accrued a $10 million liability for refunds under the second complaint of amounts collected under the higher ROE from March 2015 through May 2016. Retail Regulated Rates In December 2017, 2017 Tax Reform was signed into law, reducing the federal tax rate from 35% to 21%. Accumulated deferred income tax balances were re-measured at the 21% rate and regulatory liabilities increased reflective of the probability of such balances being passed back to customers. MidAmerican Energy has made filings or has been in discussions with each of its state rate regulatory bodies proposing either a reduction in retail rates or rate base for all or a portion of the net benefits of 2017 Tax Reform for 2018 and beyond. MidAmerican Energy proposed in Iowa, its largest jurisdiction, to reduce customer revenue via a rider mechanism for the impact of the lower statutory rate on current operations, subject to change depending on actual results, and defer as a regulatory liability the amortization of excess deferred income taxes. The Illinois Commerce Commission approved MidAmerican Energy's Illinois tax reform rate reduction tariff on March 21, 2018, and the Iowa Utilities Board approved MidAmerican Energy's Iowa tax reform rate reduction tariff on April 27, 2018. The approved tax reform rider mechanisms for each jurisdiction function consistent with MidAmerican Energy's other bill riders in that over or under collection from customers at any given time is included in accounts receivable, net, on the Balance Sheets.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies MidAmerican Funding is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Funding does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Refer to Note 10 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Nevada Power is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Nevada Power's current and future operations. Nevada Power believes it is in material compliance with all applicable laws and regulations. Legal Matters Nevada Power is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Nevada Power does not believe that such normal and routine litigation will have a material impact on its consolidated financial results.
Sierra Pacific Power Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Sierra Pacific is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Sierra Pacific's current and future operations. Sierra Pacific believes it is in material compliance with all applicable laws and regulations. Legal Matters Sierra Pacific is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Sierra Pacific does not believe that such normal and routine litigation will have a material impact on its consolidated financial results.

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Revenue from Contracts with Customers Revenue from Contracts with Customers (Notes)

6 Months Ended

Jun. 30, 2018


(11)	Revenue from Contracts with Customers

Adoption

Customer Revenue

Energy Products and Services



	For the Three-Month Period Ended June 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group		BHE Transmission		BHE Renewables		BHE and Other			Total
Customer Revenue:
Regulated:
Retail Electric	$	1,115	$	505	$	691	$	—	$	—	$	—	$	—	$	—		$	2,311
Retail Gas	—		99		19		—		—		—		—		—			118
Wholesale	9		87		6		—		—		—		—		(1		)	101
Transmission and distribution	30		14		25		216		—		174		—		—			459
Interstate pipeline	—		—		—		—		236		—		—		(25		)	211
Other	—		—		1		—		—		—		—		—			1
Total Regulated	1,154		705		742		216		236		174		—		(26		)	3,201
Nonregulated	—		5		1		10		—		3		186		158			363
Total Customer Revenue	1,154		710		743		226		236		177		186		132			3,564
Other revenue	39		8		7		20		—		—		60		22			156
Total	$	1,193	$	718	$	750	$	246	$	236	$	177	$	246	$	154		$	3,720



	For the Six-Month Period Ended June 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group		BHE Transmission		BHE Renewables		BHE and Other			Total
Customer Revenue:
Regulated:
Retail Electric	$	2,211	$	891	$	1,230	$	—	$	—	$	—	$	—	$	—		$	4,332
Retail Gas	—		345		59		—		—		—		—		—			404
Wholesale	31		180		17		—		—		—		—		(2		)	226
Transmission and distribution	52		30		45		465		—		354		—		—			946
Interstate pipeline	—		—		—		—		610		—		—		(66		)	544
Other	—		—		1		—		—		—		—		—			1
Total Regulated	2,294		1,446		1,352		465		610		354		—		(68		)	6,453
Nonregulated	—		5		1		21		—		3		303		302			635
Total Customer Revenue	2,294		1,451		1,353		486		610		357		303		234			7,088
Other revenue	83		14		14		38		2		—		97		63			311
Total	$	2,377	$	1,465	$	1,367	$	524	$	612	$	357	$	400	$	297		$	7,399

Real Estate Services

The following table summarizes the Company's real estate services revenue by line of business (in millions):



	HomeServices
	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Brokerage	$	1,168	$	1,853
Franchise	19		34
Total Customer Revenue	1,187		1,887
Other revenue	86		147
Total	$	1,273	$	2,034

Contract Assets and Liabilities

Remaining Performance Obligations



	Performance obligations expected to be satisfied:
	Less than 12 months		More than 12 months		Total
BHE Pipeline Group	$	810	$	5,955	$	6,765
BHE Transmission	350		—		350
Total	$	1,160	$	5,955	$	7,115

Revenue from Contracts with Customers

Adoption

In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. PacifiCorp adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method. The adoption did not have a cumulative effect impact at the date of initial adoption.

Customer Revenue



	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	365	$	806
Commercial	369		711
Industrial	288		557
Other retail	73		98
Total retail	1,095		2,172
Wholesale	9		31
Transmission	30		52
Other Customer Revenue	20		39
Total Customer Revenue	1,154		2,294
Other revenue	39		83
Total operating revenue	$	1,193	$	2,377

Contract Assets and Liabilities

Revenue from Contracts with Customers

Adoption

In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Nevada Power adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.

Customer Revenue

The following table summarizes Nevada Power's revenue by customer class for the three- and six-month periods ended June 30, 2018 (in millions):



	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	312	$	505
Commercial	110		205
Industrial	108		187
Other	5		11
Total fully bundled	535		908
Distribution only service	8		15
Total retail	543		923
Wholesale, transmission and other	13		23
Total Customer Revenue	556		946
Other revenue	6		11
Total revenue	$	562	$	957

Contract Assets and Liabilities

Revenue from Contracts with Customers

Adoption

In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. Sierra Pacific adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.

Customer Revenue



	Three-Month Period						Six-Month Period
	Ended June 30,						Ended June 30,
	2018						2018
	Electric		Gas		Total		Electric		Gas		Total
Customer Revenue:
Retail:
Residential	$	59	$	13	$	72	$	127	$	39	$	166
Commercial	58		4		62		115		15		130
Industrial	38		2		40		77		5		82
Other	1		—		1		3		—		3
Total fully bundled	156		19		175		322		59		381
Distribution only service	1		—		1		2		—		2
Total retail	157		19		176		324		59		383
Wholesale, transmission and other	10		—		10		23		—		23
Total Customer Revenue	167		19		186		347		59		406
Other revenue	2		—		2		3		1		4
Total revenue	$	169	$	19	$	188	$	350	$	60	$	410

Contract Assets and Liabilities

Revenue from Contracts with Customers

Adoption

In May 2014, the FASB issued ASU No. 2014-09, which created FASB ASC Topic 606, "Revenue from Contracts with Customers" ("ASC 606") and superseded ASC Topic 605, "Revenue Recognition." The guidance replaced industry-specific guidance and established a single five-step model to identify and recognize revenue from contracts with customers ("Customer Revenue"). The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Following the issuance of ASU No. 2014-09, the FASB issued several ASUs that clarified the implementation guidance for ASU No. 2014-09 but did not change the core principle of the guidance. MidAmerican Energy adopted this guidance for all applicable contracts as of January 1, 2018 under a modified retrospective method and the adoption did not have a cumulative effect impact at the date of initial adoption.

Customer Revenue



Three-Month Period	Electric		Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	173	$	65	$	—	$	238
Commercial	80		21		—		101
Industrial	195		5		—		200
Gas transportation services	—		6		—		6
Other retail⁽¹⁾	57		6		—		63
Total retail	505		103		—		608
Wholesale	63		23		—		86
Multi value transmission projects	14		—		—		14
Other Customer Revenue	—		—		1		1
Total Customer Revenue	582		126		1		709
Other revenue	7		1		—		8
Total operating revenue	$	589	$	127	$	1	$	717




Six-Month Period	Electric		Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	334	$	233	$	—	$	567
Commercial	151		83		—		234
Industrial	340		10		—		350
Gas transportation services	—		19		—		19
Other retail	67		—		—		67
Total retail	892		345		—		1,237
Wholesale	125		55		—		180
Multi value transmission projects	29		—		—		29
Other Customer Revenue	—		—		3		3
Total Customer Revenue	1,046		400		3		1,449
Other revenue	12		2		—		14
Total operating revenue	$	1,058	$	402	$	3	$	1,463

(1)

Contract Assets and Liabilities

Accumulated Other Comprehensive Income (Loss) [Line Items]

Revenue from Contracts with Customers

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Components of Accumulated Other Comprehensive Loss, Net

6 Months Ended

Jun. 30, 2018

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 tax (in millions):



	Unrecognized			Foreign			Unrealized			Unrealized			AOCI
	Amounts on			Currency			Gains on			Gains (Losses)			Attributable
	Retirement			Translation			Marketable			on Cash			To BHE
	Benefits			Adjustment			Securities			Flow Hedges			Shareholders, Net

Balance, December 31, 2016	$	(447	)	$	(1,675	)	$	585		$	26		$	(1,511	)
Other comprehensive income (loss)	1			308			119			(6		)	422
Balance, June 30, 2017	$	(446	)	$	(1,367	)	$	704		$	20		$	(1,089	)

Balance, December 31, 2017	$	(383	)	$	(1,129	)	$	1,085		$	29		$	(398	)
Adoption of ASU 2016-01	—			—			(1,085		)	—			(1,085		)
Other comprehensive income (loss)	51			(234		)	—			1			(182		)
Balance, June 30, 2018	$	(332	)	$	(1,363	)	$	—		$	30		$	(1,665	)

For more information regarding the adoption of ASU 2016-01, refer to Note 5.

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Segment Information

6 Months Ended

Jun. 30, 2018

Segment Information



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017
Operating revenue:
PacifiCorp	$	1,193	$	1,245	$	2,377	$	2,526
MidAmerican Funding	718		659		1,465		1,355
NV Energy	750		753		1,367		1,337
Northern Powergrid	246		219		524		464
BHE Pipeline Group	236		192		612		507
BHE Transmission	177		158		357		324
BHE Renewables	246		220		400		364
HomeServices	1,273		956		2,034		1,541
BHE and Other⁽¹⁾	154		152		297		302
Total operating revenue	$	4,993	$	4,554	$	9,433	$	8,720



Depreciation and amortization:
PacifiCorp	$	197		$	202	$	399		$	398
MidAmerican Funding	208			141		366			258
NV Energy	114			106		227			210
Northern Powergrid	64			52		127			101
BHE Pipeline Group	30			43		72			73
BHE Transmission	61			53		123			107
BHE Renewables	66			63		130			124
HomeServices	11			10		23			22
BHE and Other⁽¹⁾	(1		)	—		(1		)	(1		)
Total depreciation and amortization	$	750		$	670	$	1,466		$	1,292



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating income:
PacifiCorp	$	284		$	333		$	531		$	672
MidAmerican Funding	87			131			166			233
NV Energy	144			192			233			290
Northern Powergrid	111			100			258			240
BHE Pipeline Group	57			54			283			262
BHE Transmission	81			73			162			150
BHE Renewables	104			84			132			99
HomeServices	108			110			100			112
BHE and Other⁽¹⁾	(4		)	(32		)	(22		)	(46		)
Total operating income	972			1,045			1,843			2,012
Interest expense	(461		)	(457		)	(927		)	(915		)
Capitalized interest	15			10			27			20
Allowance for equity funds	24			18			45			35
Interest and dividend income	32			27			58			53
(Losses) gains on marketable securities, net	(387		)	2			(596		)	5
Other, net	1			(1		)	31			25
Total income before income tax expense and equity income	$	196		$	644		$	481		$	1,235



Interest expense:
PacifiCorp	$	96	$	95	$	192	$	190
MidAmerican Funding	61		59		124		118
NV Energy	59		58		117		116
Northern Powergrid	36		33		73		64
BHE Pipeline Group	10		10		20		22
BHE Transmission	42		39		85		80
BHE Renewables	49		52		101		102
HomeServices	6		1		10		2
BHE and Other⁽¹⁾	102		110		205		221
Total interest expense	$	461	$	457	$	927	$	915



Operating revenue by country:
United States	$	4,570	$	4,177	$	8,548	$	7,924
United Kingdom	245		219		522		464
Canada	177		158		357		324
Philippines and other	1		—		6		8
Total operating revenue by country	$	4,993	$	4,554	$	9,433	$	8,720



Income before income tax expense and equity income by country:
United States	$	93	$	529	$	211	$	952
United Kingdom	49		62		161		164
Canada	41		38		82		80
Philippines and other	13		15		27		39
Total income before income tax expense and equity income by country	$	196	$	644	$	481	$	1,235



	As of
	June 30,		December 31,
	2018		2017
Assets:
PacifiCorp	$	23,124	$	23,086
MidAmerican Funding	18,998		18,444
NV Energy	14,311		13,903
Northern Powergrid	7,537		7,565
BHE Pipeline Group	5,194		5,134
BHE Transmission	8,644		9,009
BHE Renewables	8,343		7,687
HomeServices	3,213		2,722
BHE and Other⁽¹⁾	1,577		2,658
Total assets	$	90,941	$	90,208


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

The following table shows the change in the carrying amount of goodwill by reportable segment for the six-month period ended June 30, 2018 (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, 2017	$	1,129	$	2,102	$	2,369	$	991		$	73	$	1,571		$	95	$	1,348	$	9,678
Acquisitions	—		—		—		—			—		—			—		75		75
Foreign currency translation	—		—		—		(16		)	—		(67		)	—		—		(83		)
June 30, 2018	$	1,129	$	2,102	$	2,369	$	975		$	73	$	1,504		$	95	$	1,423	$	9,670

Segment Information

The following tables provide information on a reportable segment basis (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	589		$	537		$	1,058		$	970
Regulated gas	127			120			402			382
Other	1			1			3			1
Total operating revenue	$	717		$	658		$	1,463		$	1,353

Operating income:
Regulated electric	$	78		$	125		$	114		$	188
Regulated gas	8			5			51			44
Other	1			—			1			—
Total operating income	87			130			166			232
Interest expense	(56		)	(53		)	(114		)	(106		)
Allowance for borrowed funds	4			3			8			5
Allowance for equity funds	13			8			23			14
Other, net	12			7			21			18
Income before income tax benefit	$	60		$	95		$	104		$	163



	As of
	June 30, 2018		December 31, 2017
Assets:
Regulated electric	$	15,612	$	14,914
Regulated gas	1,274		1,403
Other	—		1
Total assets	$	16,886	$	16,318

Segment Information

The following tables provide information on a reportable segment basis (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	589		$	537		$	1,058		$	970
Regulated gas	127			120			402			382
Other	2			2			5			3
Total operating revenue	$	718		$	659		$	1,465		$	1,355

Operating income:
Regulated electric	$	78		$	125		$	114		$	188
Regulated gas	8			5			51			44
Other	1			1			1			1
Total operating income	87			131			166			233
Interest expense	(61		)	(59		)	(124		)	(118		)
Allowance for borrowed funds	4			3			8			5
Allowance for equity funds	13			8			23			14
Other, net	13			7			23			18
Income before income tax benefit	$	56		$	90		$	96		$	152



	As of
	June 30, 2018		December 31, 2017
Assets⁽¹⁾:
Regulated electric	$	16,803	$	16,105
Regulated gas	1,353		1,482
Other	16		34
Total assets	$	18,172	$	17,621



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

Stockholders' Equity Note Disclosure [Text Block]

Segment Information

The following tables provide information on a reportable segment basis (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	169		$	160		$	350		$	319
Regulated natural gas	19			17			60			51
Total operating revenue	$	188		$	177		$	410		$	370

Operating income:
Regulated electric	$	18		$	34		$	55		$	70
Regulated natural gas	1			2			11			12
Total operating income	19			36			66			82
Interest expense	(11		)	(11		)	(21		)	(22		)
Allowance for borrowed funds	1			—			1			—
Allowance for equity funds	1			—			2			1
Other, net	3			1			5			2
Income before income tax expense	$	13		$	26		$	53		$	63



	As of
	June 30,		December 31,
	2018		2017
Assets:
Regulated electric	$	3,089	$	3,103
Regulated natural gas	301		300
Regulated common assets⁽¹⁾	78		10
Total assets	$	3,468	$	3,413


(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)	6 Months Ended
	Jun. 30, 2018
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 federal and state income tax has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income tax is remitted to or received from BHE. For the six-month periods ended June 30, 2018 and 2017, PacifiCorp made net cash payments for federal and state income tax to BHE totaling $32 million and $3 million, respectively.

XML 89 R51.htm IDEA: XBRL DOCUMENT

BHE Shareholders' Equity (Notes)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]


(12)	BHE Shareholders' Equity

Common Stock

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Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Policies)	6 Months Ended
	Jun. 30, 2018
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements.
MidAmerican Energy Company [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, consist substantially of funds restricted for the purpose of constructing solid waste facilities under tax-exempt bond obligation agreements.

XML 91 R53.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments and Restricted Cash and Investments [Abstract]

Investments and Restricted Cash and Investments

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



	As of
	June 30,		December 31,
	2018		2017
Investments:
BYD Company Limited common stock	$	1,364	$	1,961
Rabbi trusts	387		441
Other	186		124
Total investments	1,937		2,526

Equity method investments:
BHE Renewables tax equity investments	1,159		1,025
Electric Transmission Texas, LLC	535		524
Bridger Coal Company	124		137
Other	149		148
Total equity method investments	1,967		1,834

Restricted cash and cash equivalents and investments:
Quad Cities Station nuclear decommissioning trust funds	522		515
Restricted cash and cash equivalents	320		348
Total restricted cash and cash equivalents and investments	842		863

Total investments and restricted cash and cash equivalents and investments	$	4,746	$	5,223

Reflected as:
Current assets	$	342	$	351
Noncurrent assets	4,404		4,872
Total investments and restricted cash and cash equivalents and investments	$	4,746	$	5,223

Unrealized Gain (Loss) on Investments [Table Text Block]

The portion of unrealized losses related to investments still held as of June 30, 2018 is calculated as follows (in millions):



	Three-Month Period			Six-Month Period
	Ended June 30,			Ended June 30,
	2018			2018
Losses on marketable securities recognized during the period	$	(387	)	$	(596	)
Less: Net (losses) gains recognized during the period on marketable securities sold during the period	(1		)	1
Unrealized losses recognized during the period on marketable securities still held at the reporting date	$	(386	)	$	(597	)

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Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Table Text Block]

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



		As of
	Depreciable	June 30,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	74,975		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,240			7,176
		82,215			81,836
Accumulated depreciation and amortization		(25,155		)	(24,478		)
Regulated assets, net		57,060			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,553			6,010
Other assets	3-30 years	1,589			1,489
		8,142			7,499
Accumulated depreciation and amortization		(1,697		)	(1,542		)
Nonregulated assets, net		6,445			5,957

Net operating assets		63,505			63,315
Construction work-in-progress		3,204			2,556
Property, plant and equipment, net		$	66,709		$	65,871

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,102		$	12,107
Transmission	52-75 years	1,858			1,838
Electric distribution	20-75 years	3,463			3,380
Gas distribution	29-75 years	1,671			1,640
Utility plant in service		19,094			18,965
Accumulated depreciation and amortization		(5,731		)	(5,561		)
Utility plant in service, net		13,363			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,369			13,410
Construction work-in-progress		1,303			797
Property, plant and equipment, net		$	14,672		$	14,207

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	28,106		$	27,880
Accumulated depreciation and amortization		(9,613		)	(9,366		)
Utility plant in-service, net		18,493			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	11			11
Plant, net		18,504			18,525
Construction work-in-progress		788			678
Property, plant and equipment, net		$	19,292		$	19,203

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,713		$	3,707
Distribution	20 - 65 years	3,352			3,314
Transmission	45 - 70 years	1,861			1,860
General and intangible plant	5 - 65 years	811			793
Utility plant		9,737			9,674
Accumulated depreciation and amortization		(2,984		)	(2,871		)
Utility plant, net		6,753			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	1			1
Plant, net		6,754			6,804
Construction work-in-progress		80			73
Property, plant and equipment, net		$	6,834		$	6,877

Condensed Cash Flow Statements, Captions [Line Items]

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,144		$	1,144
Electric distribution	20 - 100 years	1,506			1,459
Electric transmission	50 - 100 years	818			786
Electric general and intangible plant	5 - 70 years	190			181
Natural gas distribution	35 - 70 years	396			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	303			294
Utility plant		4,371			4,268
Accumulated depreciation and amortization		(1,553		)	(1,513		)
Utility plant, net		2,818			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,823			2,760
Construction work-in-progress		100			132
Property, plant and equipment, net		$	2,923		$	2,892

XML 93 R55.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	1,224	$	935
Restricted cash and cash equivalents	297		327
Investments and restricted cash and cash equivalents and investments	23		21
Total cash and cash equivalents and restricted cash and cash equivalents	$	1,544	$	1,283

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions):



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	71	$	4
Restricted cash and cash equivalents included in other current assets	4		4
Total cash and cash equivalents and restricted cash and cash equivalents	$	75	$	8

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Consolidated Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Consolidated Balance Sheets (in millions):



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	416	$	57
Restricted cash and cash equivalents included in other current assets	7		9
Total cash and cash equivalents and restricted cash and cash equivalents	$	423	$	66

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]



	As of
	June 30,		December 31,
	2018		2017
Cash and cash equivalents	$	22	$	14
Restricted cash included in other current assets	13		13
Restricted cash included in other assets	2		2
Total cash and cash equivalents and restricted cash and cash equivalents	$	37	$	29

Equity Method Investments

In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. PacifiCorp adopted this guidance retrospectively effective January 1, 2018 which resulted in the reclassification of certain cash distributions received from equity method investees of $14 million previously recognized within investing cash flows to operating cash flows for the six-month period ended June 30, 2017.

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]



	As of
	June 30		December 31
	2018		2017

Cash and cash equivalents	$	370	$	172
Restricted cash and cash equivalents in other current assets	87		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	457	$	282

Condensed Cash Flow Statements, Captions [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

A reconciliation of cash and cash equivalents and restricted cash and cash equivalents as of June 30, 2018 and December 31, 2017, as presented in the Statements of Cash Flows is outlined below and disaggregated by the line items in which they appear on the Balance Sheets (in millions):



	As of
	June 30,		December 31
	2018		2017

Cash and cash equivalents	$	369	$	172
Restricted cash and cash equivalents in other current assets	87		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	456	$	282

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(78	)	(19	)	(58	)	(17	)
State income tax, net of federal income tax benefit	(19	)	1		(25	)	(2	)
Income tax effect of foreign income	(4	)	(5	)	(11	)	(5	)
Effects of ratemaking	(8	)	—		(8	)	—
Equity income	1		1		1		1
Other, net	1		—		(1	)	(1	)
Effective income tax rate	(86	)%	13	%	(81	)%	11	%

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(78	)	(19	)	(58	)	(17	)
State income tax, net of federal income tax benefit	(19	)	1		(25	)	(2	)
Income tax effect of foreign income	(4	)	(5	)	(11	)	(5	)
Effects of ratemaking	(8	)	—		(8	)	—
Equity income	1		1		1		1
Other, net	1		—		(1	)	(1	)
Effective income tax rate	(86	)%	13	%	(81	)%	11	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation

Income Taxes

Tax Cuts and Jobs Act

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Effects of ratemaking	(1	)	—		(1	)	—
Nondeductible expenses	2		—		2		—
Other	1		1		1		1
Effective income tax rate	23	%	36	%	23	%	36	%

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Effects of ratemaking	(1	)	—		(1	)	—
Nondeductible expenses	2		—		2		—
Other	1		1		1		1
Effective income tax rate	23	%	36	%	23	%	36	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation

Income Taxes

Tax Cuts and Jobs Act

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 118 to assist in the implementation process of 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. Sierra Pacific has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of interpretations of the bonus depreciation rules. Sierra Pacific has determined the amounts recorded and the interpretations relating to this items to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. Sierra Pacific believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018.

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows:



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Effects of ratemaking	14		—		(1	)	—
Nondeductible expenses	8		—		3		—
Other	3		—		—		—
Effective income tax rate	46	%	35	%	23	%	35	%

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Effects of ratemaking	14		—		(1	)	—
Nondeductible expenses	8		—		3		—
Other	3		—		—		—
Effective income tax rate	46	%	35	%	23	%	35	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation


	Income Taxes

Tax Cuts and Jobs Act

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin ("SAB") 118 to assist in the implementation process of 2017 Tax Reform by allowing for calculations to be classified as provisional and subject to remeasurement. There are three different classifications for the accounting: (1) completed, (2) not complete but reasonably estimable or (3) not complete and amounts are not reasonably estimable. PacifiCorp has recorded the impacts of 2017 Tax Reform and believes all the impacts to be complete with the exception of the interpretations of the bonus depreciation rules. PacifiCorp has determined the amounts recorded and the interpretations relating to this item to be provisional and subject to remeasurement during the measurement period upon obtaining the necessary additional information to complete the accounting. PacifiCorp believes its interpretations for bonus depreciation to be reasonable, however, as the guidance is clarified estimates may change. The accounting is estimated to be completed by December 2018. During the three- and six-month periods ended June 30, 2018, PacifiCorp did not make material revisions to its previous calculations.

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows:



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
State income tax, net of federal income tax benefit	4		3		4		3
Federal income tax credits	(5	)	(5	)	(5	)	(5	)
Effects of ratemaking	(4	)	1		(4	)	1
Other	(3	)	(2	)	(2	)	(2	)
Effective income tax rate	13	%	32	%	14	%	32	%

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
State income tax, net of federal income tax benefit	4		3		4		3
Federal income tax credits	(5	)	(5	)	(5	)	(5	)
Effects of ratemaking	(4	)	1		(4	)	1
Other	(3	)	(2	)	(2	)	(2	)
Effective income tax rate	13	%	32	%	14	%	32	%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(80	)	(67	)	(104	)	(73	)
State income tax, net of federal income tax benefit	(7	)	(4	)	(8	)	(2	)
Effects of ratemaking	(9	)	(5	)	(13	)	(7	)
Other, net	(2	)	—		—		—
Effective income tax rate	(77	)%	(41	)%	(104	)%	(47	)%

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(80	)	(67	)	(104	)	(73	)
State income tax, net of federal income tax benefit	(7	)	(4	)	(8	)	(2	)
Effects of ratemaking	(9	)	(5	)	(13	)	(7	)
Other, net	(2	)	—		—		—
Effective income tax rate	(77	)%	(41	)%	(104	)%	(47	)%

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Schedule of Effective Income Tax Rate Reconciliation

Income Taxes

Tax Cuts and Jobs Act

Iowa Senate File 2417

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(86	)	(71	)	(113	)	(78	)
State income tax, net of federal income tax benefit	(8	)	(5	)	(9	)	(2	)
Effects of ratemaking	(10	)	(5	)	(14	)	(8	)
Other, net	(1	)	—		—		—
Effective income tax rate	(84	)%	(46	)%	(115	)%	(53	)%

Berkshire Hathaway includes BHE and subsidiaries in its United States federal and Iowa state income tax returns. Consistent with established regulatory practice, MidAmerican Funding's and MidAmerican Energy's provisions for income tax have been computed on a stand-alone basis, and substantially all of their currently payable or receivable income tax is remitted to or received from BHE. MidAmerican Funding received net cash payments for income tax from BHE totaling $234 million and $8 million for the six-month periods ended June 30, 2018 and 2017, respectively.

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				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(86	)	(71	)	(113	)	(78	)
State income tax, net of federal income tax benefit	(8	)	(5	)	(9	)	(2	)
Effects of ratemaking	(10	)	(5	)	(14	)	(8	)
Other, net	(1	)	—		—		—
Effective income tax rate	(84	)%	(46	)%	(115	)%	(53	)%

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Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

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						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Service cost	$	5		$	7		$	10		$	13
Interest cost	14			15			28			29
Expected return on plan assets	(26		)	(25		)	(53		)	(49		)
Settlement	24			—			24			—
Net amortization	14			16			29			33
Net periodic benefit cost	$	31		$	13		$	38		$	26

Domestic Operations

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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Pension:
Service cost	$	5		$	6		$	10		$	12
Interest cost	26			29			52			58
Expected return on plan assets	(41		)	(40		)	(82		)	(80		)
Net amortization	7			8			15			15
Net periodic benefit (credit) cost	$	(3	)	$	3		$	(5	)	$	5

Other postretirement:
Service cost	$	3		$	2		$	5		$	4
Interest cost	6			8			12			14
Expected return on plan assets	(12		)	(11		)	(22		)	(21		)
Net amortization	(3		)	(4		)	(6		)	(7		)
Net periodic benefit credit	$	(6	)	$	(5	)	$	(11	)	$	(10	)

Schedule of Defined Benefit Plans Disclosures

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



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017
Pension:
Service cost	—		—		—		—
Interest cost	10		13		21		25
Expected return on plan assets	(18	)	(18	)	(36	)	(36	)
Net amortization	4		3		7		7
Net periodic benefit credit	(4	)	(2	)	(8	)	(4	)

Other postretirement:
Service cost	1		—		1		1
Interest cost	3		4		6		7
Expected return on plan assets	(6	)	(5	)	(11	)	(11	)
Net amortization	(2	)	(2	)	(3	)	(3	)
Net periodic benefit credit	(4	)	(3	)	(7	)	(6	)

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						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Pension:
Service cost	$	2		$	3		$	4		$	5
Interest cost	7			7			14			15
Expected return on plan assets	(11		)	(11		)	(22		)	(22		)
Net amortization	—			1			1			1
Net periodic benefit credit	$	(2	)	$	—		$	(3	)	$	(1	)

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

Schedule of Amounts Recognized in Balance Sheet

Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):



	As of
	June 30,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(23	)	$	(23	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(10		)	(10		)

Other Postretirement Plans -
Other assets	1			—
Other long-term liabilities	—			1

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
	June 30,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(1	)	$	(2	)

Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(8		)	(8		)

Other Postretirement Plans -
Other long-term liabilities	(14		)	(20		)

XML 96 R58.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities (Tables) - PacifiCorp [Member]

6 Months Ended

Jun. 30, 2018

Derivative [Line Items]

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 June 30, 2018
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	12		$	1	$	6		$	—		$	19
Commodity liabilities	(6		)	—		(42		)	(90		)	(138		)
Total	6			1		(36		)	(90		)	(119		)

Total derivatives	6			1		(36		)	(90		)	(119		)
Cash collateral receivable	—			—		19			58			77
Total derivatives - net basis	$	6		$	1	$	(17	)	$	(32	)	$	(42	)

As of December 31, 2017
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	11		$	1	$	1		$	—		$	13
Commodity liabilities	(3		)	—		(32		)	(82		)	(117		)
Total	8			1		(31		)	(82		)	(104		)

Total derivatives	8			1		(31		)	(82		)	(104		)
Cash collateral receivable	—			—		17			57			74
Total derivatives - net basis	$	8		$	1	$	(14	)	$	(25	)	$	(30	)


(1)	PacifiCorp's commodity derivatives are generally included in rates and as of June 30, 2018 and December 31, 2017, a regulatory asset of $116 million and $101 million, respectively, was recorded related to the net derivative liability of $119 million and $104 million, respectively.

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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	122		$	103		$	101		$	73
Changes in fair value recognized in net regulatory assets	6			6			34			30
Net (losses) gains reclassified to operating revenue	(1		)	1			6			13
Net losses reclassified to cost of fuel and energy	(11		)	(15		)	(25		)	(21		)
Ending balance	$	116		$	95		$	116		$	95

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	June 30,		December 31,
	Measure	2018		2017

Electricity sales	Megawatt hours	(6	)	(9	)
Natural gas purchases	Decatherms	119		113
Fuel oil purchases	Gallons	5		—

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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

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

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



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of June 30, 2018
Assets:
Commodity derivatives	$	—	$	46		$	101		$	(33	)	$	114
Interest rate derivatives	1		17			17			—			35
Mortgage loans held for sale	—		763			—			—			763
Money market mutual funds⁽²⁾	600		—			—			—			600
Debt securities:
United States government obligations	184		—			—			—			184
International government obligations	—		4			—			—			4
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	289		—			—			—			289
International companies	1,370		—			—			—			1,370
Investment funds	187		—			—			—			187
	$	2,631	$	868		$	118		$	(33	)	$	3,584
Liabilities:
Commodity derivatives	$	—	$	(184	)	$	(18	)	$	117		$	(85	)
Interest rate derivatives	—		(8		)	—			—			(8		)
	$	—	$	(192	)	$	(18	)	$	117		$	(93	)



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2017
Assets:
Commodity derivatives	$	1		$	42		$	104		$	(29	)	$	118
Interest rate derivatives	—			15			9			—			24
Mortgage loans held for sale	—			465			—			—			465
Money market mutual funds⁽²⁾	685			—			—			—			685
Debt securities:
United States government obligations	176			—			—			—			176
International government obligations	—			5			—			—			5
Corporate obligations	—			36			—			—			36
Municipal obligations	—			2			—			—			2
Equity securities:
United States companies	288			—			—			—			288
International companies	1,968			—			—			—			1,968
Investment funds	178			—			—			—			178
	$	3,296		$	565		$	113		$	(29	)	$	3,945
Liabilities:
Commodity derivatives	$	(3	)	$	(167	)	$	(10	)	$	105		$	(75	)
Interest rate derivatives	—			(8		)	—			—			(8		)
	$	(3	)	$	(175	)	$	(10	)	$	105		$	(83	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $84 million and $76 million as of June 30, 2018 and December 31, 2017, respectively.


(2)	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation

The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
				Interest						Interest
	Commodity			Rate			Commodity			Rate
	Derivatives			Derivatives			Derivatives			Derivatives
2018:
Beginning balance	$	81		$	16		$	94		$	9
Changes included in earnings	4			56			4			86
Changes in fair value recognized in OCI	1			—			—			—
Changes in fair value recognized in net regulatory assets	(5		)	—			(14		)	—
Purchases	—			—			1			—
Settlements	2			(55		)	(2		)	(78		)
Ending balance	$	83		$	17		$	83		$	17



2017:
Beginning balance	$	72		$	9		$	60		$	6
Changes included in earnings	—			39			12			66
Changes in fair value recognized in OCI	—			—			(2		)	—
Changes in fair value recognized in net regulatory assets	(3		)	—			(2		)	—
Purchases	1			—			1			(2		)
Settlements	11			(40		)	12			(62		)
Ending balance	$	81		$	8		$	81		$	8

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



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	36,707	$	40,139	$	35,193	$	40,522

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

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

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



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of June 30, 2018
Assets:
Money market mutual funds⁽¹⁾	$	25	$	—	$	—		$	25
Investment funds	1		—		—			1
	$	26	$	—	$	—		$	26

Liabilities - commodity derivatives	$	—	$	—	$	(9	)	$	(9	)

As of December 31, 2017
Assets - investment funds	$	2	$	—	$	—		$	2

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


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

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



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	(8	)	$	(14	)	$	(3	)	$	(14	)
Changes in fair value recognized in regulatory assets	(3		)	(1		)	(8		)	(2		)
Settlements	2			11			2			12
Ending balance	$	(9	)	$	(4	)	$	(9	)	$	(4	)

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



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	2,850	$	3,196	$	2,600	$	3,088

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 June 30, 2018
Assets:
Commodity derivatives	$	—	$	19		$	—	$	(12	)	$	7
Money market mutual funds⁽²⁾	21		—			—		—			21
Investment funds	25		—			—		—			25
	$	46	$	19		$	—	$	(12	)	$	53

Liabilities - Commodity derivatives	$	—	$	(138	)	$	—	$	89		$	(49	)

As of December 31, 2017
Assets:
Commodity derivatives	$	—	$	13		$	—	$	(4	)	$	9
Money market mutual funds⁽²⁾	21		—			—		—			21
Investment funds	21		—			—		—			21
	$	42	$	13		$	—	$	(4	)	$	51

Liabilities - Commodity derivatives	$	—	$	(117	)	$	—	$	78		$	(39	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $77 million and $74 million as of June 30, 2018 and December 31, 2017, respectively.


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



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	6,920	$	7,849	$	7,005	$	8,370

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 June 30, 2018:
Assets:
Commodity derivatives	$	—	$	2		$	1		$	(1	)	$	2
Money market mutual funds⁽²⁾	346		—			—			—			346
Debt securities:
United States government obligations	184		—			—			—			184
International government obligations	—		4			—			—			4
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	289		—			—			—			289
International companies	6		—			—			—			6
Investment funds	20		—			—			—			20
	$	845	$	44		$	1		$	(1	)	$	889

Liabilities - commodity derivatives	$	—	$	(7	)	$	(2	)	$	2		$	(7	)



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2017:
Assets:
Commodity derivatives	$	—	$	3		$	4		$	(2	)	$	5
Money market mutual funds⁽²⁾	133		—			—			—			133
Debt securities:
United States government obligations	176		—			—			—			176
International government obligations	—		5			—			—			5
Corporate obligations	—		36			—			—			36
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	288		—			—			—			288
International companies	7		—			—			—			7
Investment funds	15		—			—			—			15
	$	619	$	46		$	4		$	(2	)	$	667

Liabilities - commodity derivatives	$	—	$	(9	)	$	(1	)	$	2		$	(8	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $1 million and $- million as of June 30, 2018 and December 31, 2017, respectively.


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

Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017

Beginning balance	$	—		$	1		$	3		$	(2	)
Changes in fair value recognized in net regulatory assets	(1		)	(2		)	(3		)	—
Settlements	—			—			(1		)	1
Ending balance	$	(1	)	$	(1	)	$	(1	)	$	(1	)



	As of June 30, 2018				As of December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,380	$	5,653	$	5,042	$	5,686

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 June 30, 2018				As of December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,620	$	5,953	$	5,282	$	6,006

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

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

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



	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3			Total
As of June 30, 2018
Assets - money market mutual funds⁽¹⁾	$	40	$	—	$	—		$	40

Liabilities - commodity derivatives	$	—	$	—	$	(2	)	$	(2	)

As of December 31, 2017
Assets - investment funds	$	—	$	—	$	—		$	—


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

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



	Three-Month Periods					Six-Month Periods
	Ended June 30,					Ended June 30,
	2018			2017		2018			2017

Beginning balance	$	(2	)	$	—	$	—		$	—
Changes in fair value recognized in regulatory assets	(1		)	—		(3		)	—
Settlements	1			—		1			—
Ending balance	$	(2	)	$	—	$	(2	)	$	—

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



	As of June 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	1,120	$	1,168	$	1,120	$	1,221

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Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]



	For the Three-Month Period Ended June 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group		BHE Transmission		BHE Renewables		BHE and Other			Total
Customer Revenue:
Regulated:
Retail Electric	$	1,115	$	505	$	691	$	—	$	—	$	—	$	—	$	—		$	2,311
Retail Gas	—		99		19		—		—		—		—		—			118
Wholesale	9		87		6		—		—		—		—		(1		)	101
Transmission and distribution	30		14		25		216		—		174		—		—			459
Interstate pipeline	—		—		—		—		236		—		—		(25		)	211
Other	—		—		1		—		—		—		—		—			1
Total Regulated	1,154		705		742		216		236		174		—		(26		)	3,201
Nonregulated	—		5		1		10		—		3		186		158			363
Total Customer Revenue	1,154		710		743		226		236		177		186		132			3,564
Other revenue	39		8		7		20		—		—		60		22			156
Total	$	1,193	$	718	$	750	$	246	$	236	$	177	$	246	$	154		$	3,720



	For the Six-Month Period Ended June 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group		BHE Transmission		BHE Renewables		BHE and Other			Total
Customer Revenue:
Regulated:
Retail Electric	$	2,211	$	891	$	1,230	$	—	$	—	$	—	$	—	$	—		$	4,332
Retail Gas	—		345		59		—		—		—		—		—			404
Wholesale	31		180		17		—		—		—		—		(2		)	226
Transmission and distribution	52		30		45		465		—		354		—		—			946
Interstate pipeline	—		—		—		—		610		—		—		(66		)	544
Other	—		—		1		—		—		—		—		—			1
Total Regulated	2,294		1,446		1,352		465		610		354		—		(68		)	6,453
Nonregulated	—		5		1		21		—		3		303		302			635
Total Customer Revenue	2,294		1,451		1,353		486		610		357		303		234			7,088
Other revenue	83		14		14		38		2		—		97		63			311
Total	$	2,377	$	1,465	$	1,367	$	524	$	612	$	357	$	400	$	297		$	7,399



	Performance obligations expected to be satisfied:
	Less than 12 months		More than 12 months		Total
BHE Pipeline Group	$	810	$	5,955	$	6,765
BHE Transmission	350		—		350
Total	$	1,160	$	5,955	$	7,115

HomeServices [Member]

The following table summarizes the Company's real estate services revenue by line of business (in millions):



	HomeServices
	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Brokerage	$	1,168	$	1,853
Franchise	19		34
Total Customer Revenue	1,187		1,887
Other revenue	86		147
Total	$	1,273	$	2,034



	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	365	$	806
Commercial	369		711
Industrial	288		557
Other retail	73		98
Total retail	1,095		2,172
Wholesale	9		31
Transmission	30		52
Other Customer Revenue	20		39
Total Customer Revenue	1,154		2,294
Other revenue	39		83
Total operating revenue	$	1,193	$	2,377

The following table summarizes Nevada Power's revenue by customer class for the three- and six-month periods ended June 30, 2018 (in millions):



	Three-Month Period		Six-Month Period
	Ended June 30,		Ended June 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	312	$	505
Commercial	110		205
Industrial	108		187
Other	5		11
Total fully bundled	535		908
Distribution only service	8		15
Total retail	543		923
Wholesale, transmission and other	13		23
Total Customer Revenue	556		946
Other revenue	6		11
Total revenue	$	562	$	957



	Three-Month Period						Six-Month Period
	Ended June 30,						Ended June 30,
	2018						2018
	Electric		Gas		Total		Electric		Gas		Total
Customer Revenue:
Retail:
Residential	$	59	$	13	$	72	$	127	$	39	$	166
Commercial	58		4		62		115		15		130
Industrial	38		2		40		77		5		82
Other	1		—		1		3		—		3
Total fully bundled	156		19		175		322		59		381
Distribution only service	1		—		1		2		—		2
Total retail	157		19		176		324		59		383
Wholesale, transmission and other	10		—		10		23		—		23
Total Customer Revenue	167		19		186		347		59		406
Other revenue	2		—		2		3		1		4
Total revenue	$	169	$	19	$	188	$	350	$	60	$	410

Accumulated Other Comprehensive Income (Loss) [Line Items]



Three-Month Period	Electric		Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	173	$	65	$	—	$	238
Commercial	80		21		—		101
Industrial	195		5		—		200
Gas transportation services	—		6		—		6
Other retail⁽¹⁾	57		6		—		63
Total retail	505		103		—		608
Wholesale	63		23		—		86
Multi value transmission projects	14		—		—		14
Other Customer Revenue	—		—		1		1
Total Customer Revenue	582		126		1		709
Other revenue	7		1		—		8
Total operating revenue	$	589	$	127	$	1	$	717




Six-Month Period	Electric		Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	334	$	233	$	—	$	567
Commercial	151		83		—		234
Industrial	340		10		—		350
Gas transportation services	—		19		—		19
Other retail	67		—		—		67
Total retail	892		345		—		1,237
Wholesale	125		55		—		180
Multi value transmission projects	29		—		—		29
Other Customer Revenue	—		—		3		3
Total Customer Revenue	1,046		400		3		1,449
Other revenue	12		2		—		14
Total operating revenue	$	1,058	$	402	$	3	$	1,463

(1)

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Components of Accumulated Other Comprehensive Loss, Net (Tables)

6 Months Ended

Jun. 30, 2018

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 tax (in millions):



	Unrecognized			Foreign			Unrealized			Unrealized			AOCI
	Amounts on			Currency			Gains on			Gains (Losses)			Attributable
	Retirement			Translation			Marketable			on Cash			To BHE
	Benefits			Adjustment			Securities			Flow Hedges			Shareholders, Net

Balance, December 31, 2016	$	(447	)	$	(1,675	)	$	585		$	26		$	(1,511	)
Other comprehensive income (loss)	1			308			119			(6		)	422
Balance, June 30, 2017	$	(446	)	$	(1,367	)	$	704		$	20		$	(1,089	)

Balance, December 31, 2017	$	(383	)	$	(1,129	)	$	1,085		$	29		$	(398	)
Adoption of ASU 2016-01	—			—			(1,085		)	—			(1,085		)
Other comprehensive income (loss)	51			(234		)	—			1			(182		)
Balance, June 30, 2018	$	(332	)	$	(1,363	)	$	—		$	30		$	(1,665	)

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Segment Reporting Information, by Segment



	Three-Month Periods				Six-Month Periods
	Ended June 30,				Ended June 30,
	2018		2017		2018		2017
Operating revenue:
PacifiCorp	$	1,193	$	1,245	$	2,377	$	2,526
MidAmerican Funding	718		659		1,465		1,355
NV Energy	750		753		1,367		1,337
Northern Powergrid	246		219		524		464
BHE Pipeline Group	236		192		612		507
BHE Transmission	177		158		357		324
BHE Renewables	246		220		400		364
HomeServices	1,273		956		2,034		1,541
BHE and Other⁽¹⁾	154		152		297		302
Total operating revenue	$	4,993	$	4,554	$	9,433	$	8,720



Depreciation and amortization:
PacifiCorp	$	197		$	202	$	399		$	398
MidAmerican Funding	208			141		366			258
NV Energy	114			106		227			210
Northern Powergrid	64			52		127			101
BHE Pipeline Group	30			43		72			73
BHE Transmission	61			53		123			107
BHE Renewables	66			63		130			124
HomeServices	11			10		23			22
BHE and Other⁽¹⁾	(1		)	—		(1		)	(1		)
Total depreciation and amortization	$	750		$	670	$	1,466		$	1,292



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating income:
PacifiCorp	$	284		$	333		$	531		$	672
MidAmerican Funding	87			131			166			233
NV Energy	144			192			233			290
Northern Powergrid	111			100			258			240
BHE Pipeline Group	57			54			283			262
BHE Transmission	81			73			162			150
BHE Renewables	104			84			132			99
HomeServices	108			110			100			112
BHE and Other⁽¹⁾	(4		)	(32		)	(22		)	(46		)
Total operating income	972			1,045			1,843			2,012
Interest expense	(461		)	(457		)	(927		)	(915		)
Capitalized interest	15			10			27			20
Allowance for equity funds	24			18			45			35
Interest and dividend income	32			27			58			53
(Losses) gains on marketable securities, net	(387		)	2			(596		)	5
Other, net	1			(1		)	31			25
Total income before income tax expense and equity income	$	196		$	644		$	481		$	1,235



Interest expense:
PacifiCorp	$	96	$	95	$	192	$	190
MidAmerican Funding	61		59		124		118
NV Energy	59		58		117		116
Northern Powergrid	36		33		73		64
BHE Pipeline Group	10		10		20		22
BHE Transmission	42		39		85		80
BHE Renewables	49		52		101		102
HomeServices	6		1		10		2
BHE and Other⁽¹⁾	102		110		205		221
Total interest expense	$	461	$	457	$	927	$	915



Operating revenue by country:
United States	$	4,570	$	4,177	$	8,548	$	7,924
United Kingdom	245		219		522		464
Canada	177		158		357		324
Philippines and other	1		—		6		8
Total operating revenue by country	$	4,993	$	4,554	$	9,433	$	8,720



Income before income tax expense and equity income by country:
United States	$	93	$	529	$	211	$	952
United Kingdom	49		62		161		164
Canada	41		38		82		80
Philippines and other	13		15		27		39
Total income before income tax expense and equity income by country	$	196	$	644	$	481	$	1,235



	As of
	June 30,		December 31,
	2018		2017
Assets:
PacifiCorp	$	23,124	$	23,086
MidAmerican Funding	18,998		18,444
NV Energy	14,311		13,903
Northern Powergrid	7,537		7,565
BHE Pipeline Group	5,194		5,134
BHE Transmission	8,644		9,009
BHE Renewables	8,343		7,687
HomeServices	3,213		2,722
BHE and Other⁽¹⁾	1,577		2,658
Total assets	$	90,941	$	90,208


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

Schedule of Goodwill

e following table shows the change in the carrying amount of goodwill by reportable segment for the six-month period ended June 30, 2018 (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, 2017	$	1,129	$	2,102	$	2,369	$	991		$	73	$	1,571		$	95	$	1,348	$	9,678
Acquisitions	—		—		—		—			—		—			—		75		75
Foreign currency translation	—		—		—		(16		)	—		(67		)	—		—		(83		)
June 30, 2018	$	1,129	$	2,102	$	2,369	$	975		$	73	$	1,504		$	95	$	1,423	$	9,670

Schedule of Segment Reporting Information, by Segment

The following tables provide information on a reportable segment basis (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	589		$	537		$	1,058		$	970
Regulated gas	127			120			402			382
Other	1			1			3			1
Total operating revenue	$	717		$	658		$	1,463		$	1,353

Operating income:
Regulated electric	$	78		$	125		$	114		$	188
Regulated gas	8			5			51			44
Other	1			—			1			—
Total operating income	87			130			166			232
Interest expense	(56		)	(53		)	(114		)	(106		)
Allowance for borrowed funds	4			3			8			5
Allowance for equity funds	13			8			23			14
Other, net	12			7			21			18
Income before income tax benefit	$	60		$	95		$	104		$	163



	As of
	June 30, 2018		December 31, 2017
Assets:
Regulated electric	$	15,612	$	14,914
Regulated gas	1,274		1,403
Other	—		1
Total assets	$	16,886	$	16,318

Schedule of Segment Reporting Information, by Segment

The following tables provide information on a reportable segment basis (in millions):



	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	589		$	537		$	1,058		$	970
Regulated gas	127			120			402			382
Other	2			2			5			3
Total operating revenue	$	718		$	659		$	1,465		$	1,355

Operating income:
Regulated electric	$	78		$	125		$	114		$	188
Regulated gas	8			5			51			44
Other	1			1			1			1
Total operating income	87			131			166			233
Interest expense	(61		)	(59		)	(124		)	(118		)
Allowance for borrowed funds	4			3			8			5
Allowance for equity funds	13			8			23			14
Other, net	13			7			23			18
Income before income tax benefit	$	56		$	90		$	96		$	152



	As of
	June 30, 2018		December 31, 2017
Assets⁽¹⁾:
Regulated electric	$	16,803	$	16,105
Regulated gas	1,353		1,482
Other	16		34
Total assets	$	18,172	$	17,621



(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						Six-Month Periods
	Ended June 30,						Ended June 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	169		$	160		$	350		$	319
Regulated natural gas	19			17			60			51
Total operating revenue	$	188		$	177		$	410		$	370

Operating income:
Regulated electric	$	18		$	34		$	55		$	70
Regulated natural gas	1			2			11			12
Total operating income	19			36			66			82
Interest expense	(11		)	(11		)	(21		)	(22		)
Allowance for borrowed funds	1			—			1			—
Allowance for equity funds	1			—			2			1
Other, net	3			1			5			2
Income before income tax expense	$	13		$	26		$	53		$	63



	As of
	June 30,		December 31,
	2018		2017
Assets:
Regulated electric	$	3,089	$	3,103
Regulated natural gas	301		300
Regulated common assets⁽¹⁾	78		10
Total assets	$	3,468	$	3,413


(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)	6 Months Ended
General (Details)	Jun. 30, 2018 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) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0

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Business Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
Business Acquisitions (Details) - USD ($) $ in Millions	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Purchase of redeemable noncontrolling interest		$ 131	$ 0
Acquisitions, net of cash acquired			(588)
Other acquisitions [Member]
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ (107)	$ (588)
HomeServices [Member] \| Real estate brokerage franchise business [Member]
Business Acquisition [Line Items]
Ownership Percentage Acquired	33.30%
Purchase of redeemable noncontrolling interest	$ 131

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Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Investments And Restricted Cash And Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 0
Investments [Abstract]
Investments	$ 1,937		1,937		$ 2,526
Equity Method Investments [Abstract]
Equity method investments	1,967		1,967		1,834
Restricted Cash and Investments [Abstract]
Restricted cash and investments	842		842		863
Investments, including equity method investments and restricted cash and investments	4,746		4,746		5,223
Investments, including equity method investments and restricted cash and investments, current	342		342		351
Investments, including equity method investments and restricted cash and investments, noncurrent	4,404		4,404		4,872
Gain on Sale of Investments	(387)	$ 2	(596)	$ 5
Marketable Securities, Realized Gain (Loss)	(1)		1
Marketable Securities, Gain (Loss)	(386)		(597)
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	522		522		515
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	320		320		348
Equity Method Investments, tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	1,159		1,159		1,025
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	535		535		524
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	124		124		137
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	149		149		148
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	1,364		1,364		1,961
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	387		387		441
Other investments [Member]
Investments [Abstract]
Other investments	$ 186		186		$ 124
Retained Earnings [Member]
Investments And Restricted Cash And Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 1,085

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Investments and Restricted Cash and Investments Equity Method Investments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment	$ 14

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Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 63,505	$ 63,315
Construction in Progress, Gross	3,204	2,556
Property, plant and equipment, net	66,709	65,871
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	82,215	81,836
Accumulated depreciation and amortization	(25,155)	(24,478)
Property, plant and equipment in service, net	57,060	57,358
Construction in Progress, Gross	2,800	2,200
Regulated Operation [Member] \| Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 74,975	74,660
Regulated Operation [Member] \| Utility generation, transmission and distribution systems \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Regulated Operation [Member] \| Utility generation, transmission and distribution systems \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Regulated Operation [Member] \| Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,240	7,176
Regulated Operation [Member] \| Interstate natural gas pipeline assets \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Regulated Operation [Member] \| Interstate natural gas pipeline assets \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 8,142	7,499
Accumulated depreciation and amortization	(1,697)	(1,542)
Property, plant and equipment in service, net	6,445	5,957
Unregulated Operation [Member] \| Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,553	6,010
Unregulated Operation [Member] \| Independent power plants \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Unregulated Operation [Member] \| Independent power plants \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Unregulated Operation [Member] \| Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,589	$ 1,489
Unregulated Operation [Member] \| Other assets \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Unregulated Operation [Member] \| Other assets \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years

XML 107 R69.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 28,106	$ 27,880
Public utility accumulated depreciation and amortization	(9,613)	(9,366)
Public Utilities Property, Plant And Equipment In Service, Net	18,493	18,514
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	18,504	18,525
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	788	678
Public Utilities, Property, Plant and Equipment, Net	$ 19,292	19,203
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	75 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 11	$ 11

XML 108 R70.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 13,369	$ 13,410
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,303	797
Property, plant and equipment, net	14,672	14,207
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	19,094	18,965
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,731)	(5,561)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	13,363	13,404
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(1)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	6
Gross public utility property, plant and equipment in service	7	7
Electric Operations [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	12,102	12,107
Public Utilities, Property, Plant and Equipment, Transmission	1,858	1,838
Public Utilities, Property, Plant and Equipment, Distribution	3,463	3,380
Natural Gas Processing Plant [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,671	$ 1,640
Minimum [Member] \| Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	20 years
Minimum [Member] \| Electric Operations [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	52 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Minimum [Member] \| Natural Gas Processing Plant [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	29 years
Maximum [Member] \| Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	50 years
Maximum [Member] \| Electric Operations [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	75 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	75 years
Maximum [Member] \| Natural Gas Processing Plant [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	75 years

XML 109 R71.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24	$ 24
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (10)	$ (10)

XML 110 R72.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC(Details) - Nevada Power Company [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,754		$ 6,804
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	80		73
Property, plant and equipment, net	6,834		6,877
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	4
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,713		3,707
Public Utilities, Property, Plant and Equipment, Distribution	3,352		3,314
Public Utilities, Property, Plant and Equipment, Transmission	1,861		1,860
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	811		793
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,737		9,674
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,984		2,871
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,753		6,803
Regulated Operation [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	55 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	65 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 1		$ 1
Unregulated Operation [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years
Unregulated Operation [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years
Scenario, Forecast [Member] \| Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods		$ 7

XML 111 R73.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,823	$ 2,760
Property, plant and equipment, net	2,923	2,892
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	100	132
Property, plant and equipment, net	2,923	2,892
Regulated Operation [Member] \| Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,144	1,144
Public Utilities, Property, Plant and Equipment, Distribution	1,506	1,459
Public Utilities, Property, Plant and Equipment, Transmission	818	786
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 190	181
Regulated Operation [Member] \| Electricity Generation Plant, Non-Nuclear [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	25 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] \| Electricity Generation Plant, Non-Nuclear [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	100 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	100 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Regulated Operation [Member] \| Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 396	390
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 14	14
Regulated Operation [Member] \| Natural Gas Processing Plant [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	35 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years
Regulated Operation [Member] \| Natural Gas Processing Plant [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Regulated Operation [Member] \| Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	$ 303	294
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,371	4,268
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,553	1,513
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,818	2,755
Regulated Operation [Member] \| Common Facilities [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years
Regulated Operation [Member] \| Common Facilities [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	70 years
Unregulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 5	$ 5
Unregulated Operation [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years
Unregulated Operation [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years

XML 112 R74.htm IDEA: XBRL DOCUMENT

Regulatory Matters - PAC (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
Regulatory Matters - PAC (Details) - USD ($) $ in Millions	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%	35.00%	21.00%	35.00%	35.00%
PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%	35.00%	21.00%	35.00%	35.00%
Public Utilities, Requested Rate Increase (Decrease), Percentage			1.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate						21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate						21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Loss Contingency, Accrual, Current				$ 88		$ 88
Public Utilities Commission, Utah [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage		3.00%
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 61
Public Utilities Commission, Wyoming [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage		4.00%
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 26
Public Utilities Commission, Idaho [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	3.00%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 8

XML 113 R75.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - NPC (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%		35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate			21.00%
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%
Nevada Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate			21.00%
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Caesars Entertainment Corporation [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee			$ 44,000,000
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| General Rate Case [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Filed Rate Increase (Decrease), Amount						$ 29,000,000
Public Utilities, Filed Rate Increase (Decrease), Percent						2.00%
Public Utilities, Requested Rate Increase (Decrease), Amount						$ 0
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 26,000,000
Public Utilities, Revenue Sharing, Percent						50.00%
Public Utilities, Return on Equity, Percentage						10.00%
Expense Related to Regulatory Rate Review						$ 28,000,000
Nevada Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Tax Rate Reduction Rider [Member] \| Scenario, Forecast [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 59,000,000

XML 114 R76.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - SPPC (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	21.00%	35.00%		35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%	35.00%	21.00%	35.00%		35.00%
Sierra Pacific Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Federal statutory income tax rate				21.00%
Sierra Pacific Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Caesars Entertainment Corporation [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee				$ 4
Sierra Pacific Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Peppermill Resort Spa Casino [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee	$ 3
Scenario, Forecast [Member] \| Sierra Pacific Power Company [Member] \| Public Utilities Commission, Nevada [Member] \| Tax Rate Reduction Rider [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 25

XML 115 R77.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224	$ 935
Restricted cash and cash equivalents	297	327
Restricted Cash and Cash Equivalents, Noncurrent	23	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,544	$ 1,283	$ 1,065	$ 1,003

XML 116 R78.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - MEC (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224,000,000	$ 935,000,000
Restricted cash and cash equivalents	297,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544,000,000	1,283,000,000	$ 1,065,000,000	$ 1,003,000,000
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	369,000,000	172,000,000
Restricted cash and cash equivalents	87,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 456,000,000	$ 282,000,000	$ 374,000,000	$ 26,000,000

XML 117 R79.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - LLC (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224,000,000	$ 935,000,000
Restricted cash and cash equivalents	297,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544,000,000	1,283,000,000	$ 1,065,000,000	$ 1,003,000,000
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	370,000,000	172,000,000
Restricted cash and cash equivalents	87,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 457,000,000	$ 282,000,000	$ 375,000,000	$ 27,000,000

XML 118 R80.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - Pacificorp (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224	$ 935
Restricted cash and cash equivalents	297	327
Restricted Cash and Cash Equivalents, Noncurrent	23	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,283	$ 1,065	$ 1,003
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	22	14
Restricted cash and cash equivalents	13	13
Restricted Cash and Cash Equivalents, Noncurrent	2	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	37	$ 29	$ 183	$ 33
Accounting Standards Update 2016-15 [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Prior Period Reclassification Adjustment	14
Accounting Standards Update 2016-15 [Member] \| PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Prior Period Reclassification Adjustment	$ 14

XML 119 R81.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - NPC (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224	$ 935
Restricted cash and cash equivalents	297	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,283	$ 1,065	$ 1,003
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	416	57
Restricted cash and cash equivalents	7	9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 423	$ 66	$ 17	$ 290

XML 120 R82.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - SPPC (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,224	$ 935
Restricted cash and cash equivalents	297	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,283	$ 1,065	$ 1,003
Sierra Pacific Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	71	4
Restricted cash and cash equivalents	4	4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 75	$ 8	$ 8	$ 60

XML 121 R83.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Aug. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 700
Debt Instrument, Interest Rate, Stated Percentage				3.65%
NVE Holdings [Member] \| Nevada Power Company [Member] \| NPC General and Refunding Mortgage Notes, Series BB [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 575
Debt Instrument, Interest Rate, Stated Percentage			2.75%
NVE Holdings [Member] \| Nevada Power Company [Member] \| NPC General and Refunding Mortgage Notes, Series O [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 325
Debt Instrument, Interest Rate, Stated Percentage			6.50%
NVE Holdings [Member] \| Nevada Power Company [Member] \| NPC General and Refunding Mortgage Notes, Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 500
Debt Instrument, Interest Rate, Stated Percentage			6.50%
Senior Notes [Member] \| Berkshire Hathaway Energy [Member] \| Senior Notes, 2.375%, due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 450
Debt Instrument, Interest Rate, Stated Percentage					2.375%
Senior Notes [Member] \| Berkshire Hathaway Energy [Member] \| Senior Notes, 2.800%, due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 400
Debt Instrument, Interest Rate, Stated Percentage					2.80%
Senior Notes [Member] \| Berkshire Hathaway Energy [Member] \| Senior Notes, 3.250%, due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 600
Debt Instrument, Interest Rate, Stated Percentage					3.25%
Senior Notes [Member] \| Berkshire Hathaway Energy [Member] \| Senior Notes, 3.80%, due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 750
Debt Instrument, Interest Rate, Stated Percentage					3.80%
Subsequent Event [Member] \| Berkshire Hathaway Energy [Member] \| Senior Notes, 4.45%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,000
Debt Instrument, Interest Rate, Stated Percentage		4.45%
Subsequent Event [Member] \| Northern Natural Gas [Member] \| Senior Bonds, 4.30%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 450
Debt Instrument, Interest Rate, Stated Percentage		4.30%
Subsequent Event [Member] \| Northern Natural Gas [Member] \| Senior Notes, 5.75%, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 200
Debt Instrument, Interest Rate, Stated Percentage		5.75%
Subsequent Event [Member] \| PacifiCorp [Member] \| PAC First Mortgage Bonds, 4.125, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600
Debt Instrument, Interest Rate, Stated Percentage		4.125%
Subsequent Event [Member] \| PacifiCorp [Member] \| PAC First Mortgage Bonds, 5.65, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 500
Debt Instrument, Interest Rate, Stated Percentage		5.65%
Subsequent Event [Member] \| NVE Holdings [Member] \| Nevada Power Company [Member] \| NPC General and Refunding Mortgage Notes, Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	0.00%

XML 122 R84.htm IDEA: XBRL DOCUMENT

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

XML 123 R85.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - PAC (Details) - Subsequent Event [Member] - PacifiCorp [Member] $ in Millions	Jul. 31, 2018 USD ($)
PAC First Mortgage Bonds, 4.125, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600
Debt Instrument, Interest Rate, Stated Percentage	4.125%
PAC First Mortgage Bonds, 5.65, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.65%
Debt Instrument, Repurchase Amount	$ 500

XML 124 R86.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Jun. 30, 2018	Feb. 28, 2018
MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 700
Debt Instrument, Interest Rate, Stated Percentage		3.65%
MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Debt Instrument, Repurchased Face Amount	$ 350

XML 125 R87.htm IDEA: XBRL DOCUMENT

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

XML 126 R88.htm IDEA: XBRL DOCUMENT

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

XML 127 R89.htm IDEA: XBRL DOCUMENT

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Reclassification of long-term income tax receivable			$ 609
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(78.00%)	(19.00%)	(58.00%)	(17.00%)
State income tax, net of federal income tax benefit	(19.00%)	1.00%	(25.00%)	(2.00%)
Income tax effect of foreign income	(4.00%)	(5.00%)	(11.00%)	(5.00%)
Effects of ratemaking	(8.00%)	(0.00%)	(8.00%)	(0.00%)
Equity income	1.00%	1.00%	1.00%	1.00%
Other, net	1.00%	(0.00%)	(1.00%)	(1.00%)
Effective income tax rate	(86.00%)	13.00%	(81.00%)	11.00%
Recognized production tax credits	$ 33		$ 62
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			$ 311
Related party transaction, cash paid for income taxes, net				$ 24
Long-term income tax receivable	(494)		(494)		$ 0
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Increase (decrease) in provisional tax liabilities	20		$ 45
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate			21.00%
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Deferred Tax Liabilities, Net	61		$ 61
Deferred Income Tax Expense (Benefit)			2
Parent Company [Member]
Related Party Tax Expense [Abstract]
Long-term income tax receivable	494		494
Long-term income tax receivable [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Reclassification of long-term income tax receivable			609
Long-term income tax receivable adjustments			115
Related Party Tax Expense [Abstract]
Long-term income tax receivable	(494)		(494)
Long-term income tax receivable [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Long-term income tax receivable adjustments			$ 115
Maximum [Member] \| Tax Year, Current [Member] \| IOWA
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Statutory Income Tax Rate, State and Local, Percent			12.00%
Maximum [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| IOWA
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Statutory Income Tax Rate, State and Local, Percent			9.80%
Deferred Income Taxes [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Regulatory Liabilities	$ 59		$ 59

XML 128 R90.htm IDEA: XBRL DOCUMENT

Income Taxes - PAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes - PAC (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
State income tax, net of federal income tax benefit	19.00%	(1.00%)	25.00%	2.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(78.00%)	(19.00%)	(58.00%)	(17.00%)
Effects of ratemaking	(8.00%)	(0.00%)	(8.00%)	(0.00%)
Other, net	1.00%	(0.00%)	(1.00%)	(1.00%)
Effective income tax rate	86.00%	(13.00%)	81.00%	(11.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
State income tax, net of federal income tax benefit	4.00%	3.00%	4.00%	3.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(5.00%)	(5.00%)	(5.00%)	(5.00%)
Effects of ratemaking	(4.00%)	1.00%	(4.00%)	1.00%
Other, net	(3.00%)	(2.00%)	(2.00%)	(2.00%)
Effective income tax rate	13.00%	32.00%	14.00%	32.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Loss Contingency, Accrual, Current	$ 88		$ 88

XML 129 R91.htm IDEA: XBRL DOCUMENT

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes - MEC (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(78.00%)	(19.00%)	(58.00%)	(17.00%)
State income tax, net of federal income tax benefit	19.00%	(1.00%)	25.00%	2.00%
Effects of ratemaking	(8.00%)	(0.00%)	(8.00%)	(0.00%)
Other, net	1.00%	(0.00%)	(1.00%)	(1.00%)
Effective income tax rate	86.00%	(13.00%)	81.00%	(11.00%)
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			$ 311
Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate			21.00%
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Deferred Tax Liabilities, Net	$ 61		$ 61
Deferred Income Tax Expense (Benefit)			$ 2
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(80.00%)	(67.00%)	(104.00%)	(73.00%)
State income tax, net of federal income tax benefit	(7.00%)	(4.00%)	(8.00%)	(2.00%)
Effects of ratemaking	(9.00%)	(5.00%)	(13.00%)	(7.00%)
Other, net	(2.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	(77.00%)	(41.00%)	(104.00%)	(47.00%)
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			$ 228	$ 7
MidAmerican Energy Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate			21.00%
MidAmerican Energy Company [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Deferred Tax Liabilities, Net	$ 54		$ 54
Deferred Income Tax Expense (Benefit)			$ 2
Maximum [Member] \| IOWA \| Tax Year, Current [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Statutory Income Tax Rate, State and Local, Percent			12.00%
Maximum [Member] \| IOWA \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Statutory Income Tax Rate, State and Local, Percent			9.80%
Deferred Income Taxes [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Regulatory Liabilities	59		$ 59
Deferred Income Taxes [Member] \| MidAmerican Energy Company [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Regulatory Liabilities	$ 56		$ 56

XML 130 R92.htm IDEA: XBRL DOCUMENT

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(78.00%)	(19.00%)	(58.00%)	(17.00%)
State income tax, net of federal income tax benefit	19.00%	(1.00%)	25.00%	2.00%
Effects of ratemaking	(8.00%)	(0.00%)	(8.00%)	(0.00%)
Other, net	1.00%	(0.00%)	(1.00%)	(1.00%)
Effective income tax rate	86.00%	(13.00%)	81.00%	(11.00%)
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			$ 311
MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(86.00%)	(71.00%)	(113.00%)	(78.00%)
State income tax, net of federal income tax benefit	(8.00%)	(5.00%)	(9.00%)	(2.00%)
Effects of ratemaking	(10.00%)	(5.00%)	(14.00%)	(8.00%)
Other, net	(1.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	(84.00%)	(46.00%)	(115.00%)	(53.00%)
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			$ 234	$ 8
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Deferred Tax Liabilities, Net	$ 61		61
Deferred Income Tax Expense (Benefit)			2
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Related Party Income Tax Receivable (Payable) [Abstract]
Deferred Tax Liabilities, Net	54		54
Deferred Income Tax Expense (Benefit)			$ 2
Tax Cuts and Jobs Act of 2017 [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate			21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate			21.00%
Deferred Income Taxes [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Regulatory Liabilities	59		$ 59
Deferred Income Taxes [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Related Party Income Tax Receivable (Payable) [Abstract]
Regulatory Liabilities	$ 56		$ 56
IOWA \| Maximum [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Statutory Income Tax Rate, State and Local, Percent			9.80%
IOWA \| Maximum [Member] \| Tax Year, Current [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Statutory Income Tax Rate, State and Local, Percent			12.00%

XML 131 R93.htm IDEA: XBRL DOCUMENT

Income Taxes Income Taxes - NPC (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes Income Taxes - NPC (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	8.00%	0.00%	8.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	0.00%	1.00%	1.00%
Effective income tax rate	86.00%	(13.00%)	81.00%	(11.00%)
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%
Nevada Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	(1.00%)	0.00%	(1.00%)	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	2.00%	0.00%	2.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.00%	1.00%	1.00%	1.00%
Effective income tax rate	23.00%	36.00%	23.00%	36.00%
Nevada Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%

XML 132 R94.htm IDEA: XBRL DOCUMENT

Income Taxes Income Taxes - SPPC (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes Income Taxes - SPPC (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effects of ratemaking	(8.00%)	(0.00%)	(8.00%)	(0.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	0.00%	1.00%	1.00%
Effective income tax rate	86.00%	(13.00%)	81.00%	(11.00%)
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Effects of ratemaking	(14.00%)	(0.00%)	1.00%	(0.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	8.00%	0.00%	3.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	3.00%	0.00%	0.00%	0.00%
Effective income tax rate	46.00%	35.00%	23.00%	35.00%
Sierra Pacific Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate			21.00%

XML 133 R95.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 5	$ 4
Interest cost	6	8	12	14
Expected return on plan assets	(12)	(11)	(22)	(21)
Net amortization	(3)	(4)	(6)	(7)
Net periodic benefit cost	(6)	(5)	(11)	(10)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	10	12
Interest cost	26	29	52	58
Expected return on plan assets	(41)	(40)	(82)	(80)
Net amortization	7	8	15	15
Net periodic benefit cost	(3)	3	(5)	5
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	7	10	13
Interest cost	14	15	28	29
Expected return on plan assets	(26)	(25)	(53)	(49)
Defined Benefit Plan, Plan Assets, Payment for Settlement	24	0	24	0
Net amortization	14	16	29	33
Net periodic benefit cost	31	$ 13	38	$ 26
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 4		$ 8

XML 134 R96.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - Employer Contributions (Details) - 6 months ended Jun. 30, 2018 £ in Millions, $ in Millions	USD ($)	GBP (£)	GBP (£)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 7
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	37
Employer contributions	6
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year \| £			£ 46
Employer contributions	$ 32	£ 23

XML 135 R97.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 5	$ 4
Interest cost	6	8	12	14
Expected return on plan assets	(12)	(11)	(22)	(21)
Net amortization	(3)	(4)	(6)	(7)
Net periodic benefit cost	(6)	(5)	(11)	(10)
PacifiCorp [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	1	1
Interest cost	3	4	6	7
Expected return on plan assets	(6)	(5)	(11)	(11)
Net amortization	(2)	(2)	(3)	(3)
Net periodic benefit cost	(4)	(3)	(7)	(6)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	10	12
Interest cost	26	29	52	58
Expected return on plan assets	(41)	(40)	(82)	(80)
Net amortization	7	8	15	15
Net periodic benefit cost	(3)	3	(5)	5
Domestic Plan [Member] \| PacifiCorp [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	10	13	21	25
Expected return on plan assets	(18)	(18)	(36)	(36)
Net amortization	4	3	7	7
Net periodic benefit cost	(4)	(2)	(8)	(4)
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 4		$ 8
Accounting Standards Update 2017-07 [Member] \| PacifiCorp [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment		$ 5		$ 11

XML 136 R98.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 7
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	37
Employer contributions	6
Domestic Plan [Member] \| PacifiCorp [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	4
Employer contributions	$ 2

XML 137 R99.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Plan [Member] \| Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 6	$ 10	$ 12
Interest cost	26	29	52	58
Expected return on plan assets	(41)	(40)	(82)	(80)
Net amortization	7	8	15	15
Net periodic benefit cost	(3)	3	(5)	5
Pension Plan [Member] \| Domestic Plan [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3	4	5
Interest cost	7	7	14	15
Expected return on plan assets	(11)	(11)	(22)	(22)
Net amortization	0	1	1	1
Net periodic benefit cost	(2)	0	(3)	(1)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2	5	4
Interest cost	6	8	12	14
Expected return on plan assets	(12)	(11)	(22)	(21)
Net amortization	(3)	(4)	(6)	(7)
Net periodic benefit cost	(6)	(5)	(11)	(10)
Other Postretirement Benefits Plan [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	1	3	2
Interest cost	2	2	4	4
Expected return on plan assets	(4)	(4)	(7)	(7)
Net amortization	(1)	(1)	(2)	(2)
Net periodic benefit cost	(1)	$ (2)	(2)	$ (3)
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	4		8
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	(6)		(11)
Accounting Standards Update 2017-07 [Member] \| MidAmerican Energy Company [Member] \| Other Pension, Postretirement and Supplemental Plans [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ (5)		$ (10)

XML 138 R100.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 7
MidAmerican Energy Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	0
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	37
Employer contributions	6
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	$ 3

XML 139 R101.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - NPC - Amounts Payable (Details) - Nevada Power Company [Member] - Domestic Plan [Member] - NV Energy, Inc. [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other Noncurrent Liabilities [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ 23	$ 23
Other Noncurrent Liabilities [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	10	10
Other Noncurrent Liabilities [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	0	1
Other Current Liabilities [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	1	1
Other Assets [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 1	$ 0

XML 140 R102.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - SPPC - Amounts Payable (Details) - Domestic Plan [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 6
Sierra Pacific Power Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	6
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	1	$ 2
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	8	8
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	14	20
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 141 R103.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (119)		$ (104)
Cash collateral, net receivable, offset against derivative positions	77		74
Derivative assets (liabilities), at fair value, net	(42)		(30)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		8
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	6		8
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	1		1
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	1		1
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(36)		(31)
Cash collateral, net receivable, offset against derivative positions	19		17
Derivative assets (liabilities), at fair value, net	(17)		(14)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(90)		(82)
Cash collateral, net receivable, offset against derivative positions	58		57
Derivative assets (liabilities), at fair value, net	(32)		(25)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	19		13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(138)		(117)
Derivative, fair value, net	(119)		(104)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	116	$ 122	101	$ 95	$ 103	$ 73
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	12		11
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(6)		(3)
Derivative, fair value, net	6		8
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Derivative, fair value, net	1		1
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	6		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(42)		(32)
Derivative, fair value, net	(36)		(31)
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(90)		(82)
Derivative, fair value, net	$ (90)		$ (82)

XML 142 R104.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - PacifiCorp [Member] - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 122	$ 103	$ 101	$ 73
Changes in fair value recognized in net regulatory assets	6	6	34	30
Net (losses) gains reclassified to operating revenue	(1)	1	6	13
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(11)	(15)	(25)	(21)
Ending balance	$ 116	$ 95	$ 116	$ 95

XML 143 R105.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - PacifiCorp [Member] - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Jun. 30, 2018 gal Dth MWh	Dec. 31, 2017 gal Dth MWh
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	(6)	(9)
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	(119)	(113)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| gal	(5)	0

XML 144 R106.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 128	$ 110
Collateral already posted, aggregate fair value	77	74
Additional collateral, aggregate fair value	$ 41	$ 34

XML 145 R107.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	$ (33)		$ (33)			$ (29)
Assets, fair value disclosure	3,584		3,584			3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	117		117			105
Derivative liabilities	(93)		(93)			(83)
Cash collateral, net receivable, offset against derivative positions	84		84			76
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,631		2,631			3,296
Derivative liabilities	0		0			(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	868		868			565
Derivative liabilities	(192)		(192)			(175)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	118		118			113
Derivative liabilities	(18)		(18)			(10)
Mortgage Loans on Real Estate [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	763		763			465
Mortgage Loans on Real Estate [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	763		763			465
Mortgage Loans on Real Estate [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	600		600			685
Money market mutual funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	600		600			685
Money market mutual funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	184		184			176
United States government obligations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	184		184			176
United States government obligations [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	4		4			5
International government obligations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
International government obligations [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4		4			5
International government obligations [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Corporate obligations [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	36		36			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	36		36			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
United States companies [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	289		289			288
United States companies [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	289		289			288
United States companies [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	1,370		1,370			1,968
International companies [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,370		1,370			1,968
International companies [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	187		187			178
Investment funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	187		187			178
Investment funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	(33)		(33)			(29)
Derivative assets	114		114			118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	117		117			105
Derivative liabilities	(85)		(85)			(75)
Commodity derivative [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0			1
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0			(3)
Commodity derivative [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	46		46			42
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(184)		(184)			(167)
Commodity derivative [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	101		101			104
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(18)		(18)			(10)
Interest Rate Contract [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	35		35			24
Derivative liabilities	(8)		(8)			(8)
Interest Rate Contract [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1		1			0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0			0
Interest Rate Contract [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	17		17			15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(8)		(8)			(8)
Interest Rate Contract [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	17		17			9
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0			0
Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	83	$ 81	83	$ 81	$ 81	94	$ 72	$ 60
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(4)	0	(4)	(12)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1)	0	0	2
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	5	3	14	2
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)	(11)	2	(12)
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	17	8	17	8	$ 16	$ 9	$ 9	$ 6
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(56)	(39)	(86)	(66)
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	0	0	0	(2)
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	$ 55	$ 40	$ 78	$ 62

XML 146 R108.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 81	$ 72	$ 94	$ 60
Changes included in earnings	4	0	4	12
Changes in fair value recognized in other comprehensive income	1	0	0	(2)
Changes in fair value recognized in net regulatory assets	(5)	(3)	(14)	(2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	1	1
Settlements	2	11	(2)	12
Ending balance	83	81	83	81
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	16	9	9	6
Changes included in earnings	56	39	86	66
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	0	0	0	(2)
Settlements	(55)	(40)	(78)	(62)
Ending balance	$ 17	$ 8	$ 17	$ 8

XML 147 R109.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 40,139	$ 40,522

XML 148 R110.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	$ (33)	$ (29)
Assets, fair value disclosure	3,584	3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	117	105
Derivative Liability	(93)	(83)
Cash collateral, net receivable, offset against derivative positions	84	76
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,631	3,296
Derivative Liability	0	(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	868	565
Derivative Liability	(192)	(175)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	118	113
Derivative Liability	(18)	(10)
Commodity derivative [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(33)	(29)
Derivative assets	114	118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	117	105
Derivative Liability	(85)	(75)
Commodity derivative [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	(3)
Commodity derivative [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	46	42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(184)	(167)
Commodity derivative [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	101	104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(18)	(10)
Money market mutual funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	600	685
Money market mutual funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	600	685
Money market mutual funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Money market mutual funds [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Investment funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	187	178
Investment funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	187	178
Investment funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
Investment funds [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
PacifiCorp [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	53	51
PacifiCorp [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	46	42
PacifiCorp [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	19	13
PacifiCorp [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
PacifiCorp [Member] \| Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	77	74
PacifiCorp [Member] \| Commodity derivative [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(12)	(4)
Derivative assets	7	9
Derivative liability, fair value, gross asset and right to reclaim cash, offset	89	78
Derivative Liability	(49)	(39)
Cash collateral, net receivable, offset against derivative positions	77	74
PacifiCorp [Member] \| Commodity derivative [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] \| Commodity derivative [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	19	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(138)	(117)
PacifiCorp [Member] \| Commodity derivative [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] \| Money market mutual funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	21	21
PacifiCorp [Member] \| Money market mutual funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	21	21
PacifiCorp [Member] \| Money market mutual funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] \| Money market mutual funds [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	25	21
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	25	21
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0	0
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	$ 0	$ 0

XML 149 R111.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,139	40,522
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	6,920	7,005
PacifiCorp [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 7,849	$ 8,370

XML 150 R112.htm IDEA: XBRL DOCUMENT

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

Jun. 30, 2018

Dec. 31, 2017

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

Cash collateral, net receivable, offset against derivative positions

$ 84

$ 76

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

(33)

(29)

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

3,584

3,945

117

105

Money market mutual funds [Member]

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

United States government obligations [Member]

600

685

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

International government obligations [Member]

184

176

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

Corporate obligations [Member]

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

Municipal obligations [Member]

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

United States companies [Member]

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

International companies [Member]

289

288

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

Investment funds [Member]

1,370

1,968

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]

187

178

Level 1 [Member]

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

2,631

3,296

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

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

600

685

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

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

184

176

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

Level 1 [Member] | Corporate obligations [Member]

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

Level 1 [Member] | Municipal obligations [Member]

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

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

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

Level 1 [Member] | International companies [Member]

289

288

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

Level 1 [Member] | Investment funds [Member]

1,370

1,968

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]

187

178

Level 2 [Member]

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

868

565

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

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

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

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

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

Level 2 [Member] | Corporate obligations [Member]

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

Level 2 [Member] | Municipal obligations [Member]

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

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

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

Level 2 [Member] | International companies [Member]

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

Level 2 [Member] | Investment funds [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]

Level 3 [Member]

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

118

113

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

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

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

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

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

Level 3 [Member] | Corporate obligations [Member]

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

Level 3 [Member] | Municipal obligations [Member]

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

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

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

Level 3 [Member] | International companies [Member]

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

Level 3 [Member] | Investment funds [Member]

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

Commodity derivative [Member]

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

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

(33)

(29)

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

117

105

Commodity derivative [Member] | Level 1 [Member]

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

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

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

(3)

Commodity derivative [Member] | Level 2 [Member]

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

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

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

(184)

(167)

Commodity derivative [Member] | Level 3 [Member]

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

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

101

104

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

(18)

(10)

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] | Money market mutual funds [Member]

889

667

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

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

^[1]

346

133

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

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

184

176

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

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

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

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

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

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

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

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

289

288

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

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

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

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

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

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

845

619

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

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

^[1]

346

133

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

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

184

176

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

MidAmerican Energy Company [Member] | Level 1 [Member] | Corporate obligations [Member]

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

MidAmerican Energy Company [Member] | Level 1 [Member] | Municipal obligations [Member]

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

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

289

288

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

MidAmerican Energy Company [Member] | Level 1 [Member] | Investment funds [Member]

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

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

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

MidAmerican Energy Company [Member] | Level 2 [Member] | Money market mutual funds [Member]

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

MidAmerican Energy Company [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] | Level 2 [Member] | International government obligations [Member]

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

MidAmerican Energy Company [Member] | Level 2 [Member] | Corporate obligations [Member]

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

MidAmerican Energy Company [Member] | Level 2 [Member] | Municipal obligations [Member]

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

MidAmerican Energy Company [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] | Level 2 [Member] | International companies [Member]

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

MidAmerican Energy Company [Member] | Level 2 [Member] | Investment funds [Member]

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

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

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

MidAmerican Energy Company [Member] | Level 3 [Member] | Money market mutual funds [Member]

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

MidAmerican Energy Company [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] | Level 3 [Member] | International government obligations [Member]

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

MidAmerican Energy Company [Member] | Level 3 [Member] | Corporate obligations [Member]

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

MidAmerican Energy Company [Member] | Level 3 [Member] | Municipal obligations [Member]

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

MidAmerican Energy Company [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] | Level 3 [Member] | International companies [Member]

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

MidAmerican Energy Company [Member] | Level 3 [Member] | Investment funds [Member]

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

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

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

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]

(1)

(2)

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

(7)

(8)

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

^[2]

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Level 1 [Member]

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

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

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

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Level 2 [Member]

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

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

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

(7)

(9)

MidAmerican Energy Company [Member] | Commodity derivative [Member] | Level 3 [Member]

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

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

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

$ (2)

$ (1)

[1]	Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Represents netting under master netting arrangements and a net cash collateral receivable of $1 million and $- million as of June 30, 2018 and December 31, 2017, respectively.

XML 151 R113.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC - Level 3 (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 1	$ 3
Changes in fair value recognized in net regulatory assets	(1)	(2)	(3)
Settlements	0	0	(1)
Ending balance	$ (1)	(1)	$ (1)	$ (1)
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance				(2)
Changes in fair value recognized in net regulatory assets				0
Settlements				1
Ending balance		$ (1)		$ (1)

XML 152 R114.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,139	40,522
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,380	5,042
Long-term debt, fair value		$ 5,686
MidAmerican Energy Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,653

XML 153 R115.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,139	40,522
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,620	5,282
Long-term debt, fair value		$ 6,006
MidAmerican Funding, LLC and Subsidiaries [Domain] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,953

XML 154 R116.htm IDEA: XBRL DOCUMENT

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

Jun. 30, 2018

Dec. 31, 2017

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]

$ 3,584

$ 3,945

Level 1 [Member]

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

2,631

3,296

Level 2 [Member]

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

868

565

Level 3 [Member]

Money market mutual funds [Member]

118

113

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

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

600

685

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

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

600

685

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]

187

178

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

Investment funds [Member] | Level 2 [Member]

187

178

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

184

167

Commodity derivative [Member] | Level 3 [Member]

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

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

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

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

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

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

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]

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]

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

$ 9

$ 3

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

XML 155 R117.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (8)	$ (14)	$ (3)	$ (14)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	3	1	8	2
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(2)	(11)	(2)	(12)
Ending balance	$ (9)	$ (4)	$ (9)	$ (4)

XML 156 R118.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,139	40,522
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,850	2,600
Nevada Power Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 3,196	$ 3,088

XML 157 R119.htm IDEA: XBRL DOCUMENT

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

Jun. 30, 2018

Dec. 31, 2017

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]

$ 600

$ 685

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

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

600

685

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]

187

178

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

Investment funds [Member] | Level 2 [Member]

187

178

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

(3)

Commodity derivative [Member] | Level 2 [Member]

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

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

(184)

(167)

Commodity derivative [Member] | Level 3 [Member]

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

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

(18)

(10)

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

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

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]

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

^[1]

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] | Commodity derivative [Member]

$ 0

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

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

(2)

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

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

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

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

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

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

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

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

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

$ (2)

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

XML 158 R120.htm IDEA: XBRL DOCUMENT

Fair Value Measurements Fair Value Measurements - SPPC - Level 3 (Details) - Sierra Pacific Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (2)	$ 0	$ 0	$ 0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	(1)	0	(3)	0
Settlements	1	0	(1)	0
Ending balance	$ (2)	$ 0	$ (2)	$ 0

XML 159 R121.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,707	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,139	40,522
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,120	1,120
Sierra Pacific Power Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,168	$ 1,221

XML 160 R122.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies - Commitments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 283
PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	613
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

- Details

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

XML 161 R123.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	6 Months Ended
	Jun. 30, 2018 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 162 R124.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) $ in Millions	Jun. 30, 2018 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 283

XML 163 R125.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] - Electric Transmission [Member] $ in Millions	6 Months Ended
	Jun. 30, 2018 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	$ 10
Prior to September 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
November 2013 to February 2015 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	10.32%
Public Utilities, Intervenor Proposed Return On Equity, Percentage	9.15%
February 2015 through May 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

XML 164 R126.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Retail Rates (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017 [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate			21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Federal statutory income tax rate			21.00%

XML 165 R127.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - PAC - Commitments (Details) $ in Millions	Jun. 30, 2018 USD ($)
PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 613

XML 166 R128.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 722		$ 722		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,564		7,088
Energy	3,720	$ 3,598	7,399	$ 7,179
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	156		311
MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	710		1,451
Energy	718	659	1,465	1,355
MidAmerican Funding [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	8		14
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,154		2,294
Energy	1,193	1,245	2,377	2,526
PacifiCorp [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	39		83
NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	743		1,353
Energy	750	753	1,367	1,337
NV Energy, Inc. [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	7		14
Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	226		486
Energy	246	219	524	464
Northern Powergrid Holdings [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	20		38
BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	236		610
Energy	236	192	612	507
BHE Pipeline Group [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	0		2
BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	177		357
Energy	177	158	357	324
BHE Transmission [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	0		0
BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	186		303
Energy	246	220	400	364
BHE Renewables [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	60		97
Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	132		234
Energy	154	$ 152	297	$ 302
Berkshire Hathaway Energy And Other [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Energy	22		63
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,201		6,453
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,311		4,332
Regulated Operation [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118		404
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		226
Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	459		946
Regulated Operation [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	211		544
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
Regulated Operation [Member] \| MidAmerican Funding [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	705		1,446
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	505		891
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	99		345
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	87		180
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		30
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| MidAmerican Funding [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,154		2,294
Regulated Operation [Member] \| PacifiCorp [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,115		2,211
Regulated Operation [Member] \| PacifiCorp [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| PacifiCorp [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9		31
Regulated Operation [Member] \| PacifiCorp [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30		52
Regulated Operation [Member] \| PacifiCorp [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| PacifiCorp [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| NV Energy, Inc. [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	742		1,352
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	691		1,230
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19		59
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6		17
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	25		45
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| NV Energy, Inc. [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
Regulated Operation [Member] \| Northern Powergrid Holdings [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	216		465
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	216		465
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Pipeline Group [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	236		610
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	236		610
Regulated Operation [Member] \| BHE Pipeline Group [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	174		354
Regulated Operation [Member] \| BHE Transmission [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Transmission [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Transmission [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Transmission [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	174		354
Regulated Operation [Member] \| BHE Transmission [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Transmission [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| BHE Renewables [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(26)		(68)
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(1)		(2)
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Regulated interstate pipeline [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(25)		(66)
Regulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Unregulated Operation [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	363		635
Unregulated Operation [Member] \| MidAmerican Funding [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5		5
Unregulated Operation [Member] \| PacifiCorp [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Unregulated Operation [Member] \| NV Energy, Inc. [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
Unregulated Operation [Member] \| Northern Powergrid Holdings [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10		21
Unregulated Operation [Member] \| BHE Pipeline Group [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Unregulated Operation [Member] \| BHE Transmission [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3		3
Unregulated Operation [Member] \| BHE Renewables [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	186		303
Unregulated Operation [Member] \| Berkshire Hathaway Energy And Other [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 158		$ 302

XML 167 R129.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - Real Estate Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,564		$ 7,088
Real estate	1,273	$ 956	2,034	$ 1,541
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,187		1,887
Real estate	1,273	$ 956	2,034	$ 1,541
HomeServices [Member] \| Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,168		1,853
HomeServices [Member] \| Real estate franchise [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19		34
HomeServices [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Real estate	$ 86		$ 147

XML 168 R130.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,160
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01 \| BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	810
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01 \| Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	350
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	5,955
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 \| BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	5,955
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 \| Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	7,115
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) \| BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	6,765
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) \| Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 350

XML 169 R131.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - PAC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,564		$ 7,088
Unbilled Contracts Receivable	722		722		$ 665
Revenues	4,993	$ 4,554	9,433	$ 8,720
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,201		6,453
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,311		4,332
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		226
Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	459		946
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Accounts Receivable	614		614		635
Unbilled Contracts Receivable	271		271		$ 255
Revenues	1,193		2,377
PacifiCorp [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	39		83
PacifiCorp [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,154		2,294
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,095		2,172
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	365		806
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	369		711
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	288		557
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	73		98
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9		31
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30		52
PacifiCorp [Member] \| Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 20		$ 39

XML 170 R132.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,564		$ 7,088
Revenues	4,993	$ 4,554	9,433	$ 8,720
Unbilled Contracts Receivable	722		722		$ 665
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,201		6,453
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,311		4,332
Regulated Operation [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118		404
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		226
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	709		1,449
Revenues	717	$ 658	1,463	$ 1,353
Unbilled Contracts Receivable	123		123		$ 89
MidAmerican Energy Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	8		14
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	608		1,237
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	238		567
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		234
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	200		350
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member] \| Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6		19
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	63		67
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	86		180
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electricity Transmission [Member] \| Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		29
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	582		1,046
Revenues	589		1,058
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	505		892
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	173		334
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	80		151
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	195		340
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	57		67
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	63		125
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Electricity Transmission [Member] \| Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		29
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	7		12
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	126		400
Revenues	127		402
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	103		345
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	65		233
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	21		83
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5		10
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member] \| Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6		19
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated retail gas [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6		0
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	23		55
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	1		2
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
Revenues	1		3
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0		$ 0

XML 171 R133.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - LLC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,564	$ 7,088
Unregulated Operation [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	363	635
MidAmerican Funding, LLC and Subsidiaries [Domain] \| Unregulated Operation [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1	$ 2

XML 172 R134.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - NPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 722		$ 722		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,564		7,088
Revenues	4,993	$ 4,554	9,433	$ 8,720
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,201		6,453
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,311		4,332
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		226
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	194		194		$ 111
Revenues	562		957
Nevada Power Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	6		11
Nevada Power Company [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	556		946
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	543		923
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13		23
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	535		908
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	312		505
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	110		205
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	108		187
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5		11
Nevada Power Company [Member] \| Distribution only service [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 8		$ 15

XML 173 R135.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - SPPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 722		$ 722		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	3,564		7,088
Revenues	4,993	$ 4,554	9,433	$ 8,720
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,201		6,453
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,311		4,332
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101		226
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	53		53		$ 62
Revenues	188	$ 177	410	$ 370
Sierra Pacific Power Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	2		4
Sierra Pacific Power Company [Member] \| Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues	169		350
Sierra Pacific Power Company [Member] \| Electric Operations [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	2		3
Sierra Pacific Power Company [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues	19		60
Sierra Pacific Power Company [Member] \| Natural Gas Operations [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	0		1
Sierra Pacific Power Company [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	186		406
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10		23
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	167		347
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Electric Operations [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10		23
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19		59
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Natural Gas Operations [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	175		381
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	72		166
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	62		130
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40		82
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	156		322
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59		127
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	58		115
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	38		77
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19		59
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Natural Gas Operations [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13		39
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Natural Gas Operations [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4		15
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Natural Gas Operations [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2		5
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Natural Gas Operations [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Distribution only service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		2
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Distribution only service [Member] \| Electric Operations [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		2
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Distribution only service [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled and distribution services only customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	176		383
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled and distribution services only customer [Member] \| Electric Operations [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	157		324
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled and distribution services only customer [Member] \| Natural Gas Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 19		$ 59

XML 174 R136.htm IDEA: XBRL DOCUMENT

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 0
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			(398)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	$ 54	$ (4)	51	$ 1
Other comprehensive income (loss), foreign currency translation adjustment	(307)	221	(234)	308
Unrealized gains on marketable securities, net of tax	0	81	0	119
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	3	(2)	1	(6)
Other comprehensive income (loss)	(250)	296	(182)	422
Ending balance - Accumulated other comprehensive loss, net	(1,665)		(1,665)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			(1,085)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits			(383)	(447)
Beginning balance - foreign currency translation adjustment			(1,129)	(1,675)
Beginning balance - unrealized gains (losses) on available-for-sale securities			1,085	585
Beginning balance - unrealized gains (losses) on cash flow hedges			29	26
Beginning balance - Accumulated other comprehensive loss, net			(398)	(1,511)
Other comprehensive income (loss), unrecognized amounts on retirement benefits			51	1
Other comprehensive income (loss), foreign currency translation adjustment			(234)	308
Unrealized gains on marketable securities, net of tax			0	119
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			1	(6)
Other comprehensive income (loss)			(182)	422
Ending balance - unrecognized amounts on retirement benefits	(332)	(446)	(332)	(446)
Ending balance - foreign currency translation adjustment	(1,363)	(1,367)	(1,363)	(1,367)
Ending balance - unrealized gains (losses) on available-for-sale securities	0	704	0	704
Ending balance - unrealized gains (losses) on cash flow hedges	30	20	30	20
Ending balance - Accumulated other comprehensive loss, net	$ (1,665)	$ (1,089)	$ (1,665)	$ (1,089)

XML 175 R137.htm IDEA: XBRL DOCUMENT

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (398)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	$ 0	$ 81	0	$ 119
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	3	(2)	1	(6)
Other comprehensive income (loss)	(250)	296	(182)	422
Ending balance - Accumulated other comprehensive loss, net	(1,665)		(1,665)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities			1,085	585
Beginning balance - unrealized gains (losses) on cash flow hedges			29	26
Beginning balance - Accumulated other comprehensive loss, net			(398)	(1,511)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			0	119
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			1	(6)
Other comprehensive income (loss)			(182)	422
Ending balance - unrealized gains (losses) on available-for-sale securities	0	704	0	704
Ending balance - unrealized gains (losses) on cash flow hedges	30	20	30	20
Ending balance - Accumulated other comprehensive loss, net	$ (1,665)	$ (1,089)	$ (1,665)	$ (1,089)

XML 176 R138.htm IDEA: XBRL DOCUMENT

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Segment Information (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Sales revenue from energy operations	3,720	3,598	7,399	7,179
Real estate	1,273	956	2,034	1,541
Depreciation and amortization - energy operations	(739)	(660)	(1,443)	(1,270)
Depreciation and amortization	750	670	1,466	1,292
Operating income	972	1,045	1,843	2,012
Interest expense	461	457	927	915
Capitalized interest	15	10	27	20
Allowance for equity funds	24	18	45	35
Interest and dividend income	32	27	58	53
(Losses) gains on marketable securities, net	(387)	2	(596)	5
Other, net	1	(1)	31	25
Income before income tax expense and equity income	196	644	481	1,235
Assets	90,941		90,941		$ 90,208
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,193	1,245	2,377	2,526
Depreciation and amortization - energy operations	(197)	(202)	(399)	(398)
Operating income	284	333	531	672
Interest expense	96	95	192	190
Assets	23,124		23,124		23,086
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	718	659	1,465	1,355
Depreciation and amortization - energy operations	(208)	(141)	(366)	(258)
Operating income	87	131	166	233
Interest expense	61	59	124	118
Assets	18,998		18,998		18,444
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	750	753	1,367	1,337
Depreciation and amortization - energy operations	(114)	(106)	(227)	(210)
Operating income	144	192	233	290
Interest expense	59	58	117	116
Assets	14,311		14,311		13,903
Northern Powergrid Holdings [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	246	219	524	464
Depreciation and amortization - energy operations	(64)	(52)	(127)	(101)
Operating income	111	100	258	240
Interest expense	36	33	73	64
Assets	7,537		7,537		7,565
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	236	192	612	507
Depreciation and amortization - energy operations	(30)	(43)	(72)	(73)
Operating income	57	54	283	262
Interest expense	10	10	20	22
Assets	5,194		5,194		5,134
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	177	158	357	324
Depreciation and amortization - energy operations	(61)	(53)	(123)	(107)
Operating income	81	73	162	150
Interest expense	42	39	85	80
Assets	8,644		8,644		9,009
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	246	220	400	364
Depreciation and amortization - energy operations	(66)	(63)	(130)	(124)
Operating income	104	84	132	99
Interest expense	49	52	101	102
Assets	8,343		8,343		7,687
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	1,273	956	2,034	1,541
Depreciation and amortization	11	10	23	22
Operating income	108	110	100	112
Interest expense	6	1	10	2
Assets	3,213		3,213		2,722
Berkshire Hathaway Energy And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	154	152	297	302
Depreciation and amortization - energy operations	1	0	1	1
Operating income	(4)	(32)	(22)	(46)
Interest expense	102	110	205	221
Assets	1,577		1,577		$ 2,658
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4,570	4,177	8,548	7,924
Income before income tax expense and equity income	93	529	211	952
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	245	219	522	464
Income before income tax expense and equity income	49	62	161	164
CANADA
Segment Reporting Information [Line Items]
Revenues	177	158	357	324
Income before income tax expense and equity income	41	38	82	80
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	1	0	6	8
Income before income tax expense and equity income	$ 13	$ 15	$ 27	$ 39

XML 177 R139.htm IDEA: XBRL DOCUMENT

Segment Information - Goodwill (Details) $ in Millions	6 Months Ended
Segment Information - Goodwill (Details) $ in Millions	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,678
Acquisitions	75
Foreign currency translation	(83)
Ending balance	9,670
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129
Acquisitions	0
Foreign currency translation	0
Ending balance	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102
Acquisitions	0
Foreign currency translation	0
Ending balance	2,102
NV Energy, Inc. [Member]
Goodwill [Roll Forward]
Beginning balance	2,369
Acquisitions	0
Foreign currency translation	0
Ending balance	2,369
Northern Powergrid Holdings [Member]
Goodwill [Roll Forward]
Beginning balance	991
Acquisitions	0
Foreign currency translation	(16)
Ending balance	975
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	73
Acquisitions	0
Foreign currency translation	0
Ending balance	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,571
Acquisitions	0
Foreign currency translation	(67)
Ending balance	1,504
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95
Acquisitions	0
Foreign currency translation	0
Ending balance	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	1,348
Acquisitions	75
Foreign currency translation	0
Ending balance	$ 1,423

XML 178 R140.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) OperatingSegments ReportableSegments	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| OperatingSegments			8
Revenues	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Operating income	972	1,045	1,843	2,012
Interest expense	(461)	(457)	(927)	(915)
Capitalized interest	15	10	27	20
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Income before income tax (benefit) expense and equity income	196	644	481	1,235
Assets	90,941		$ 90,941		$ 90,208
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments \| ReportableSegments			2
Electric Domestic Regulated Revenue	589	537	$ 1,058	970
Revenues	717	658	1,463	1,353
Operating income	87	130	166	232
Interest expense	(56)	(53)	(114)	(106)
Capitalized interest	4	3	8	5
Allowance for equity funds	13	8	23	14
Other, net	12	7	21	18
Income before income tax (benefit) expense and equity income	60	95	104	163
Assets	16,886		16,886		16,318
MidAmerican Energy Company [Member] \| Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	589	537	1,058	970
Operating income	78	125	114	188
Assets	15,612		15,612		14,914
MidAmerican Energy Company [Member] \| Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	127	120	402	382
Operating income	8	5	51	44
Assets	1,274		1,274		1,403
MidAmerican Energy Company [Member] \| Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	1	1	3	1
Operating income	1	$ 0	1	$ 0
Assets	$ 0		$ 0		$ 1

XML 179 R141.htm IDEA: XBRL DOCUMENT

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

3 Months Ended

6 Months Ended

Jun. 30, 2018

USD ($)

Jun. 30, 2017

USD ($)

Jun. 30, 2018

USD ($)

OperatingSegments

ReportableSegments

Jun. 30, 2017

USD ($)

Dec. 31, 2017

USD ($)

Number of reportable segments | OperatingSegments

$ 4,993

$ 4,554

$ 9,433

$ 8,720

972

1,045

1,843

2,012

(461)

(457)

(927)

(915)

Capitalized interest

Income before income tax (benefit) expense and equity income

(1)

196

644

481

1,235

90,941

$ 90,941

$ 90,208

Number of reportable segments | ReportableSegments

589

537

$ 1,058

970

718

659

1,465

1,355

131

166

233

(61)

(59)

(124)

(118)

Capitalized interest

Income before income tax (benefit) expense and equity income

152

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

^[1]

18,172

17,621

589

537

1,058

970

125

114

188

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

^[1]

16,803

16,105

Gas Domestic Regulated Revenue

127

120

402

382

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

^[1]

1,353

1,482

Other Revenue, Net

$ 1

^[1]

$ 16

$ 34

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

XML 180 R142.htm IDEA: XBRL DOCUMENT

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

3 Months Ended

6 Months Ended

Jun. 30, 2018

USD ($)

Jun. 30, 2017

USD ($)

Jun. 30, 2018

USD ($)

OperatingSegments

TheNumberOfReportableSegments

Jun. 30, 2017

USD ($)

Dec. 31, 2017

USD ($)

Number of reportable segments | OperatingSegments

$ 4,993

$ 4,554

$ 9,433

$ 8,720

972

1,045

1,843

2,012

461

457

927

915

Income before income tax expense and equity income

(1)

196

644

481

1,235

90,941

$ 90,941

$ 90,208

Number of reportable segments | TheNumberOfReportableSegments

Gas Domestic Regulated Revenue

169

160

$ 350

319

188

177

410

370

Allowance for Funds Used During Construction, Capitalized Interest

Income before income tax expense and equity income

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

3,468

3,413

169

160

350

319

169

350

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

3,089

3,103

Gas Domestic Regulated Revenue

$ 2

$ 12

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

301

300