Document

Cash and cash equivalents

Current assets:

115

172

Accounts receivable, net

385

348

Income tax receivable

150

Inventories

205

245

Other current assets

104

134

Total current assets

959

963

Property, plant and equipment, net

15,246

14,221

Goodwill

1,270

Regulatory assets

230

204

Investments and restricted cash and cash equivalents and investments

758

730

Other assets

208

233

Total assets

^[1]

18,671

17,621

Current liabilities:

Accounts payable

348

451

Accrued interest

Accrued property, income and other taxes

155

133

Notes Payable, Related Parties, Current

158

164

Current portion of long-term debt

500

350

Other current liabilities

153

128

Total current liabilities

1,371

1,279

Long-term debt

5,120

4,932

Deferred income taxes

2,319

2,235

Regulatory liabilities

1,645

1,661

Asset retirement obligations

546

528

Other long-term liabilities

325

326

Total liabilities

11,326

10,961

Commitments and contingencies

Equity:

Additional paid-in capital

1,679

Retained earnings

5,666

4,981

Total member's equity

7,345

6,660

Total liabilities and equity

$ 18,671

$ 17,621

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

XML 44 R8.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - NPC - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,016	$ 935
Inventories	851	888
Other current assets	860	815
Total current assets	5,784	5,778
Regulatory assets	2,778	2,761
Other assets	1,276	1,248
Total assets	91,862	90,208
Current liabilities:
Accounts payable	1,331	1,519
Accrued interest	518	488
Accrued property, income and other taxes	543	354
Other current liabilities	1,026	1,049
Total current liabilities	7,821	11,603
Regulatory liabilities	7,553	7,309
Deferred income taxes	8,895	8,242
Other long-term liabilities	2,552	2,984
Total liabilities	62,174	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,357	6,368
Retained earnings	25,361	22,206
Accumulated other comprehensive loss, net	(1,667)	(398)
Total BHE shareholders' equity	29,557	28,176
Total liabilities and equity	91,862	90,208
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	80	57
Accounts receivable, net	368	238
Inventories	58	59
Regulatory assets	16	28
Other current assets	79	44
Total current assets	601	426
Property, plant and equipment, net	6,830	6,877
Regulatory assets	880	941
Other assets	41	35
Total assets	8,352	8,279
Current liabilities:
Accounts payable	168	156
Accrued interest	33	50
Accrued property, income and other taxes	128	63
Regulatory liabilities	51	91
Current portion of long-term debt and financial and capital lease obligations	519	842
Customer deposits	64	73
Other current liabilities	43	16
Total current liabilities	1,006	1,291
Long-term debt and financial and capital lease obligations	2,297	2,233
Regulatory liabilities	1,123	1,030
Deferred income taxes	757	767
Other long-term liabilities	264	280
Total liabilities	5,447	5,601
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	601	374
Accumulated other comprehensive loss, net	(4)	(4)
Total BHE shareholders' equity	2,905	2,678
Total liabilities and equity	$ 8,352	$ 8,279

XML 45 R9.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Sep. 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 46 R10.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets - SPPC - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,016	$ 935
Inventories	851	888
Other current assets	860	815
Total current assets	5,784	5,778
Regulatory assets	2,778	2,761
Other assets	1,276	1,248
Total assets	91,862	90,208
Current liabilities:
Accounts payable	1,331	1,519
Accrued interest	518	488
Accrued property, income and other taxes	543	354
Other current liabilities	1,026	1,049
Total current liabilities	7,821	11,603
Regulatory liabilities	7,553	7,309
Deferred income taxes	8,895	8,242
Other long-term liabilities	2,552	2,984
Total liabilities	62,174	61,900
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,357	6,368
Retained earnings	25,361	22,206
Accumulated other comprehensive loss, net	(1,667)	(398)
Total BHE shareholders' equity	29,557	28,176
Total liabilities and equity	91,862	90,208
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	71	4
Accounts receivable, net	106	112
Inventories	53	49
Regulatory assets	8	32
Other current assets	32	17
Total current assets	270	214
Property, plant and equipment, net	2,938	2,892
Regulatory assets	293	300
Other assets	15	7
Total assets	3,516	3,413
Current liabilities:
Accounts payable	84	92
Accrued interest	11	14
Accrued property, income and other taxes	13	10
Regulatory liabilities	32	19
Current portion of long-term debt and financial and capital lease obligations	2	2
Customer deposits	19	15
Other current liabilities	25	12
Total current liabilities	186	164
Long-term debt and financial and capital lease obligations	1,153	1,152
Regulatory liabilities	489	481
Deferred income taxes	333	330
Other long-term liabilities	107	114
Total liabilities	2,268	2,241
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	138	62
Accumulated other comprehensive loss, net	(1)	(1)
Total BHE shareholders' equity	1,248	1,172
Total liabilities and equity	$ 3,516	$ 3,413

XML 47 R11.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Sep. 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 48 R12.htm IDEA: XBRL DOCUMENT

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 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 49 R13.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue:
Total operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Energy:
Operations and maintenance	901	772	2,534	2,334
Depreciation and amortization	667	635	2,110	1,905
Property and other taxes	142	142	428	421
Real estate	1,133	882	3,067	2,311
Total operating expenses	4,114	3,643	11,704	10,351
Operating income	1,523	1,640	3,366	3,652
Other income (expense):
Interest expense	(453)	(464)	(1,380)	(1,379)
Capitalized interest	17	14	44	34
Allowance for equity funds	30	24	75	59
Interest and dividend income	27	32	85	85
Gains (losses) on marketable securities, net	260	3	(336)	8
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax expense (benefit) and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Equity income	9	30	35	80
Net income	1,409	1,078	2,305	2,228
Net income attributable to noncontrolling interests	8	10	19	30
Net income attributable to BHE shareholders	1,401	1,068	2,286	2,198
Electricity and natural gas [Member]
Operating revenue:
Total operating revenue	4,419	4,322	11,818	11,501
Residential real estate brokerage and mortgage businesses [Member]
Operating revenue:
Total operating revenue	$ 1,218	$ 961	$ 3,252	$ 2,502

XML 50 R14.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Operating expenses:
Operating income	1,523	1,640	3,366	3,652
Other income (expense):
Interest expense	(453)	(464)	(1,380)	(1,379)
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax expense and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Net income attributable to BHE shareholders	1,401	1,068	2,286	2,198
PacifiCorp [Member]
Operating revenue	1,369	1,430	3,746	3,956
Cost of sales	465	465	1,300	1,305
Operating expenses:
Operations and maintenance	266	254	777	771
Depreciation and amortization	203	200	602	598
Property and other taxes	49	50	150	149
Utilities Operating Expense	983	969	2,829	2,823
Operating income	386	461	917	1,133
Other income (expense):
Interest expense	(96)	(95)	(288)	(285)
Interest Costs Capitalized Adjustment	5	4	13	12
Allowance for equity funds	9	7	24	21
Other, net	14	12	36	30
Total other income (expense)	(68)	(72)	(215)	(222)
Income before income tax expense and equity income	318	389	702	911
Income tax expense (benefit)	48	126	100	294
Net income attributable to BHE shareholders	$ 270	$ 263	$ 602	$ 617

XML 51 R15.htm IDEA: XBRL DOCUMENT

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Statements of Operations - MEC - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue:
Total operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Operating expenses:
Total operating expenses	4,114	3,643	11,704	10,351
Operating income	1,523	1,640	3,366	3,652
Other income (expense):
Interest expense	(453)	(464)	(1,380)	(1,379)
Allowance for borrowed funds	17	14	44	34
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax (benefit) expense and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Net Income (Loss) Attributable to Parent	1,401	1,068	2,286	2,198
MidAmerican Energy Company [Member]
Operating revenue:
Total operating revenue	832	813	2,295	2,166
Operating expenses:
Operations and maintenance	201	204	598	561
Depreciation and amortization	133	111	499	369
Property and other taxes	30	30	92	90
Total operating expenses	554	529	1,851	1,650
Operating income	278	284	444	516
Other income (expense):
Interest expense	(56)	(54)	(170)	(160)
Allowance for borrowed funds	6	4	14	9
Allowance for equity funds	16	11	39	25
Other, net	13	9	34	27
Total other income (expense)	(21)	(30)	(83)	(99)
Income before income tax (benefit) expense and equity income	257	254	361	417
Income tax expense (benefit)	(226)	(131)	(334)	(207)
Net Income (Loss) Attributable to Parent	483	385	695	624
Regulated electric \| MidAmerican Energy Company [Member]
Operating revenue:
Total operating revenue	727	707	1,785	1,677
Cost of sales	140	130	366	342
Regulated natural gas and other \| MidAmerican Energy Company [Member]
Operating revenue:
Total operating revenue	105	106	510	489
Cost of sales	$ 50	$ 54	$ 296	$ 288

XML 52 R16.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue:
Total operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Operating expenses:
Total operating expenses	4,114	3,643	11,704	10,351
Operating income	1,523	1,640	3,366	3,652
Other income (expense):
Other Interest and Dividend Income	(453)	(464)	(1,380)	(1,379)
Allowance for borrowed funds	17	14	44	34
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax (benefit) expense and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Net Income (Loss) Attributable to Parent	1,401	1,068	2,286	2,198
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Total operating revenue	832	815	2,297	2,170
Operating expenses:
Operations and maintenance	201	206	599	563
Depreciation and amortization	133	111	499	369
Property and other taxes	30	30	92	90
Total operating expenses	554	531	1,853	1,653
Operating income	278	284	444	517
Other income (expense):
Other Interest and Dividend Income	(61)	(59)	(185)	(177)
Allowance for borrowed funds	6	4	14	9
Allowance for equity funds	16	11	39	25
Other, net	12	10	35	28
Total other income (expense)	(27)	(34)	(97)	(115)
Income before income tax (benefit) expense and equity income	251	250	347	402
Income tax expense (benefit)	(228)	(133)	(338)	(214)
Net Income (Loss) Attributable to Parent	479	383	685	616
Regulated electric \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Total operating revenue	727	707	1,785	1,677
Cost of sales	140	130	366	342
Regulated natural gas and other \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Total operating revenue	105	108	512	493
Cost of sales	$ 50	$ 54	$ 297	$ 289

XML 53 R17.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Total operating expenses	4,114	3,643	11,704	10,351
Operating income	1,523	1,640	3,366	3,652
Interest expense	(453)	(464)	(1,380)	(1,379)
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax expense and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Net income attributable to BHE shareholders	1,401	1,068	2,286	2,198
Nevada Power Company [Member]
Operating revenue	820	819	1,777	1,785
Cost of sales	331	318	740	721
Operations and maintenance	146	96	344	276
Depreciation and amortization	85	77	253	231
Property and other taxes	11	10	31	29
Total operating expenses	573	501	1,368	1,257
Operating income	247	318	409	528
Interest expense	(38)	(44)	(128)	(132)
Allowance for Funds Used During Construction, Capitalized Interest	0	1	1	1
Allowance for equity funds	1	0	2	1
Other, net	7	4	16	16
Total other income (expense)	(30)	(39)	(109)	(114)
Income before income tax expense and equity income	217	279	300	414
Income tax expense (benefit)	53	103	72	151
Net income attributable to BHE shareholders	$ 164	$ 176	$ 228	$ 263

XML 54 R18.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Cost of sales	1,271	1,212	3,565	3,380
Total operating expenses	4,114	3,643	11,704	10,351
Operating income	1,523	1,640	3,366	3,652
Interest expense	(453)	(464)	(1,380)	(1,379)
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Total other income (expense)	(100)	(408)	(1,462)	(1,185)
Income before income tax expense and equity income	1,423	1,232	1,904	2,467
Income tax expense (benefit)	23	184	(366)	319
Net income attributable to BHE shareholders	1,401	1,068	2,286	2,198
Sierra Pacific Power Company [Member]
Total operating revenue	239	230	649	600
Operations and maintenance	53	41	140	122
Depreciation and amortization	30	29	89	85
Property and other taxes	6	6	18	18
Total operating expenses	183	156	527	444
Operating income	56	74	122	156
Interest expense	(12)	(11)	(33)	(33)
Allowance for Funds Used During Construction, Capitalized Interest	0	1	1	1
Allowance for equity funds	1	1	3	2
Other, net	3	3	8	5
Total other income (expense)	(8)	(6)	(21)	(25)
Income before income tax expense and equity income	48	68	101	131
Income tax expense (benefit)	13	24	25	46
Net income attributable to BHE shareholders	35	44	76	85
Regulated electric \| Sierra Pacific Power Company [Member]
Total operating revenue	225	215	575	534
Cost of sales	90	76	245	193
Regulated natural gas \| Sierra Pacific Power Company [Member]
Total operating revenue	14	15	74	66
Cost of sales	$ 4	$ 4	$ 35	$ 26

XML 55 R19.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,409	$ 1,078	$ 2,305	$ 2,228
Other comprehensive income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	1	(15)	(50)	(16)
Foreign currency translation adjustment	(2)	227	(236)	535
Unrealized gains on marketable securities, net of tax	0	423	0	542
Unrealized losses on cash flow hedges, net of tax	1	1	2	(5)
Total other comprehensive (loss) income, net of tax	(2)	666	(184)	1,088
Comprehensive income	1,407	1,744	2,121	3,316
Comprehensive income attributable to noncontrolling interests	8	10	19	30
Comprehensive income attributable to BHE shareholders	$ 1,399	$ 1,734	$ 2,102	$ 3,286

XML 56 R20.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 0	$ 1	$ 12	$ (3)
Unrealized (losses) gains on marketable securities, tax	0	284	0	355
Unrealized (losses) gains on cash flow hedges, tax	$ (1)	$ 1	$ (1)	$ (3)

XML 57 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	2,212	0	0		2,198	0	14
Other comprehensive income (loss)	1,088	0	0		0	1,088	0
Common stock purchases	(19)	0	(1)		(18)	0	0
Conversion of Stock, Amount Converted	(100)		(6)		(94)
Distributions	(16)	0	0		0	0	(16)
Other equity transactions	(24)	$ 0	(21)		0	0	(3)
Balance (shares) at Sep. 30, 2017		77
Balance at Sep. 30, 2017	27,604	$ 0	6,362		21,534	(423)	131
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	2,302	0	0		2,286	0	16
Other comprehensive income (loss)	(184)	0	0		0	(184)	0
Reclassification of long-term income tax receivable	(609)			$ (609)
Long-term income tax receivable adjustments				115	(115)
Common stock purchases	(107)	0	(6)		(101)	0	0
Distributions	(17)	$ 0	0		0	0	(17)
Other equity transactions	$ (5)		(5)				0
Balance (shares) at Sep. 30, 2018	77	77
Balance at Sep. 30, 2018	$ 29,688	$ 0	$ 6,357		$ 25,361	$ (1,667)	$ 131
Long-term income tax receivable	$ (494)			$ (494)

XML 58 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	$ 2,198					617				617
Total other comprehensive (loss) income, net of tax	1,088	$ 0	$ 0	$ 0	$ 1,088
Dividends, Common Stock, Cash						(500)				(500)
Stockholders' Equity Attributable to Parent at Sep. 30, 2017						7,507	2	0	4,479	3,038	(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	2,286					602				602
Total other comprehensive (loss) income, net of tax	(184)	$ 0	$ 0	$ 0	$ (184)
Dividends, Common Stock, Cash						(400)				(400)
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	$ 29,557					$ 7,757	$ 2	$ 0	$ 4,479	$ 3,291	$ (15)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

XML 59 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	$ 2,198					624			624
Other comprehensive income (loss)	1,088	$ 0	$ 0	$ 0	$ 1,088
Stockholders' Equity, Other	(24)	0	(21)	0	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2017						5,784	0	561	5,223
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176					5,764	0	561	5,203
Net Income (Loss) Attributable to Parent	2,286					695			695
Other comprehensive income (loss)	(184)	$ 0	0	$ 0	$ (184)
Stockholders' Equity, Other	(5)		$ (5)
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	$ 29,557					$ 6,459	$ 0	$ 561	$ 5,898

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

XML 60 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	$ 2,198				616		616
Other comprehensive income (loss)	1,088	$ 0	$ 0	$ 1,088
Stockholders' Equity Attributable to Parent at Sep. 30, 2017					6,702	1,679	5,023
Stockholders' Equity, Other	(24)	(21)	0	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				6,660	1,679	4,981
Net Income (Loss) Attributable to Parent	2,286				685		685
Other comprehensive income (loss)	(184)	0	$ 0	$ (184)
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	29,557				$ 7,345	$ 1,679	$ 5,666
Stockholders' Equity, Other	$ (5)	$ (5)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

XML 61 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	$ 2,198					263			263
Dividends, Common Stock, Cash						412			412
Stockholders' Equity, Other	$ 24	$ 0	$ 21	$ 0	$ 0
Balance (shares) at Sep. 30, 2017		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017						$ 2,823	$ 0	2,308	518	(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	2,286					228			228
Stockholders' Equity, Other	$ 5		$ 5			$ 1			1
Balance (shares) at Sep. 30, 2018	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	$ 29,557					$ 2,905	$ 0	$ 2,308	$ 601	$ (4)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

XML 62 R26.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Common Stock [Member]	Sierra Pacific Power Company [Member]	Sierra Pacific Power Company [Member] Common Stock [Member]	Sierra Pacific Power Company [Member] Additional Paid-in Capital [Member]	Sierra Pacific Power Company [Member] Retained Earnings [Member]	Sierra Pacific Power Company [Member] Accumulated Other Comprehensive (Loss) Income, Net [Member]
Balance (shares) at Dec. 31, 2016		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016			$ 1,108	$ 0	$ 1,111	$ (2)	$ (1)
Net Income (Loss) Attributable to Parent	$ 2,198		85			85
Dividends, Common Stock, Cash			5	$ 0		5	0
Balance (shares) at Sep. 30, 2017		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017			$ 1,188	$ 0	1,111	78	(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	$ 2,286		$ 76			76
Balance (shares) at Sep. 30, 2018	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	$ 29,557		$ 1,248	$ 0	$ 1,111	$ 138	$ (1)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Restricted Cash and Cash Equivalents Items [Line Items]

XML 63 R27.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 2,305	$ 2,228
Adjustments to reconcile net income to net cash flows from operating activities:
Gains (losses) on marketable securities, net	(336)	8
Depreciation and amortization	2,147	1,943
Allowance for equity funds	(75)	(59)
Equity income, net of distributions	17	(14)
Changes in regulatory assets and liabilities	263	17
Deferred income taxes and amortization of investment tax credits	(116)	573
Other, net	40	21
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(192)	(82)
Derivative collateral, net	9	(16)
Pension and other postretirement benefit plans	(61)	(29)
Accrued property, income and other taxes, net	190	390
Accounts payable and other liabilities	168	170
Net cash flows from operating activities	5,031	5,134
Cash flows from investing activities:
Capital expenditures	(4,203)	(3,179)
Acquisitions, net of cash acquired		(1,102)
Purchases of marketable securities	287	167
Proceeds from sales of marketable securities	266	186
Equity method investments	(236)	(80)
Other, net	48	(12)
Net cash flows from investing activities	(4,517)	(4,354)
Cash flows from financing activities:
Proceeds from BHE senior debt	3,166	0
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Common stock purchases	(107)	(19)
Proceeds from subsidiary debt	2,353	1,562
Repayments of subsidiary debt	(2,297)	(834)
Net (repayments of) proceeds from short-term debt	(2,694)	365
Purchase of redeemable noncontrolling interest	(131)	0
Other, net	(32)	(60)
Net cash flows from financing activities	(392)	(330)
Effect of exchange rate changes	(3)	6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,402	$ 1,459

XML 64 R28.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(75)	(59)
Changes in regulatory assets and liabilities	263	17
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Trade receivables and other assets	(192)	(82)
Derivative collateral, net	9	(16)
Accrued property, income and other taxes, net	190	390
Accounts payable and other liabilities	168	170
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Other, net	48	(12)
Net cash flows from investing activities	(4,517)	(4,354)
Net proceeds from (repayments of) short-term debt	2,694	(365)
Other, net	(32)	(60)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	602	617
Depreciation and amortization	602	598
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(24)	(21)
Changes in regulatory assets and liabilities	127	21
Deferred income taxes and amortization of investment tax credits	(53)	14
Other Noncash Income (Expense)	(1)	1
Trade receivables and other assets	(31)	42
Increase (Decrease) in Inventories	4	(1)
Derivative collateral, net	4	(4)
Increase (Decrease) in Prepaid Expense	10	9
Accrued property, income and other taxes, net	204	145
Accounts payable and other liabilities	36	40
Net cash flows from operating activities	1,480	1,461
Capital expenditures	(713)	(553)
Other, net	2	5
Net cash flows from investing activities	(711)	(548)
Proceeds from Issuance of Long-term Debt	593	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(588)	(54)
Net proceeds from (repayments of) short-term debt	(80)	(270)
Payments of Ordinary Dividends, Common Stock	(400)	(500)
Other, net	0	(3)
Net cash flows from financing activities	(475)	(827)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	294	86
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 323	$ 119

XML 65 R29.htm IDEA: XBRL DOCUMENT

Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
Statements of Cash Flows - MEC - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Derivative collateral, net	9	(16)
Pension and other postretirement benefit plans	(61)	(29)
Accrued property, income and other taxes, net	190	390
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Purchases of marketable securities	287	167
Proceeds from sales of marketable securities	266	186
Other, net	48	(12)
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net (repayments of) proceeds from short-term debt	(2,694)	365
Other, net	(32)	(60)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	695	624
Depreciation and amortization	499	369
Amortization of Utility Plant to Other Operating Expense	26	25
Allowance for equity funds	(39)	(25)
Deferred income taxes and amortization of investment tax credits	(35)	64
Other Noncash Income (Expense)	13	5
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	46	29
Increase (Decrease) in Inventories	40	29
Derivative collateral, net	0	3
Pension and other postretirement benefit plans	(10)	(8)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(38)	18
Accrued property, income and other taxes, net	(77)	98
Net cash flows from operating activities	1,028	1,173
Capital expenditures	(1,466)	(1,162)
Purchases of marketable securities	224	126
Proceeds from sales of marketable securities	198	127
Other, net	29	(10)
Net cash flows from investing activities	(1,463)	(1,171)
Proceeds from Issuance of Long-term Debt	687	842
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	488
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(99)	490
Cash and cash equivalents and restricted cash and cash equivalents at end of period	115
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 183	$ 516

XML 66 R30.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Derivative collateral, net	9	(16)
Pension and other postretirement benefit plans	(61)	(29)
Accrued property, income and other taxes, net	190	390
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Purchases of marketable securities	(287)	(167)
Proceeds from sales of marketable securities	266	186
Other, net	48	(12)
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net (repayments of) proceeds from short-term debt	(2,694)	365
Other, net	(32)	(60)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,016
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	685	616
Depreciation and amortization	499	369
Amortization of Utility Plant to Other Operating Expense	26	25
Allowance for equity funds	(39)	(25)
Deferred income taxes and amortization of investment tax credits	(35)	64
Other Noncash Income (Expense)	17	4
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	42	32
Increase (Decrease) in Inventories	40	29
Derivative collateral, net	0	3
Pension and other postretirement benefit plans	(10)	(8)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(41)	13
Accrued property, income and other taxes, net	(65)	96
Net cash flows from operating activities	1,035	1,154
Capital expenditures	(1,466)	(1,162)
Purchases of marketable securities	(224)	(126)
Proceeds from sales of marketable securities	198	127
Other, net	29	(13)
Net cash flows from investing activities	(1,463)	(1,174)
Proceeds from Issuance of Long-term Debt	687	842
Repayments of BHE senior debt and junior subordinated debentures	(350)	(255)
Increase (Decrease) in Notes Payable, Related Parties, Current	(6)	21
Net (repayments of) proceeds from short-term debt	0	(99)
Other, net	(2)	0
Net cash flows from financing activities	329	509
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(99)	489
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	183	$ 516
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 115

XML 67 R31.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Changes in regulatory assets and liabilities	263	17
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Trade receivables and other assets	(192)	(82)
Accrued property, income and other taxes, net	190	390
Accounts payable and other liabilities	168	170
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Acquisitions, net of cash acquired		(1,102)
Payments for (Proceeds from) Other Investing Activities	(48)	12
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	228	263
Marketable Securities, Gain (Loss)	(1)	0
Other Nonrecurring (Income) Expense	0	(1)
Depreciation and amortization	253	231
Allowance for equity funds	(2)	(1)
Changes in regulatory assets and liabilities	75	25
Deferred income taxes and amortization of investment tax credits	(7)	61
Deferred Energy Change	12	(22)
Amortization of Deferred Charges	13	13
Other Noncash Income (Expense)	9	(1)
Trade receivables and other assets	(138)	(125)
Increase (Decrease) in Inventories	1	6
Accrued property, income and other taxes, net	54	11
Accounts payable and other liabilities	(11)	9
Net cash flows from operating activities	486	469
Capital expenditures	(203)	(202)
Acquisitions, net of cash acquired	0	(77)
Payments for (Proceeds from) Other Investing Activities	(1)	(4)
Net cash flows from investing activities	(202)	(275)
Proceeds from Issuance of Long-term Debt	573	91
Repayments of BHE senior debt and junior subordinated debentures	(836)	(86)
Payments of Ordinary Dividends, Common Stock	0	(412)
Net cash flows from financing activities	(263)	(407)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	21	(213)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	66	290
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 87	$ 77

XML 68 R32.htm IDEA: XBRL DOCUMENT

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Changes in regulatory assets and liabilities	263	17
Deferred income taxes and amortization of investment tax credits	(116)	573
Trade receivables and other assets	(192)	(82)
Accrued property, income and other taxes, net	190	390
Accounts payable and other liabilities	168	170
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	76	85
Depreciation and amortization	89	85
Allowance for equity funds	(3)	(2)
Changes in regulatory assets and liabilities	32	9
Deferred income taxes and amortization of investment tax credits	9	46
Deferred Energy Change	26	(23)
Amortization of Deferred Charges	(6)	(43)
Trade receivables and other assets	(3)	11
Increase (Decrease) in Inventories	5	2
Accrued property, income and other taxes, net	(2)	(2)
Accounts payable and other liabilities	(5)	(54)
Net cash flows from operating activities	208	110
Capital expenditures	(139)	(131)
Net cash flows from investing activities	(139)	(131)
Repayments of BHE senior debt and junior subordinated debentures	(2)	(1)
Payments of Ordinary Dividends, Common Stock	0	(5)
Net cash flows from financing activities	(2)	(6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	67	(27)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	8	60
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 75	$ 33

XML 69 R33.htm IDEA: XBRL DOCUMENT

General	9 Months Ended
General	Sep. 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 September 30, 2018 and for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 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 and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2018 and for the three- and nine-month periods ended September 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 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 holding company based in Des Moines, Iowa and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Financial Statements as of September 30, 2018, and for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 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 holding company based in Des Moines, Iowa and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). MidAmerican Funding's direct, wholly owned subsidiary is MHC Inc. ("MHC"), which constitutes substantially all of MidAmerican Funding's assets, liabilities and business activities except those related to MidAmerican Funding's long-term debt securities. MHC conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's principal subsidiary is MidAmerican Energy Company ("MidAmerican Energy"), a public utility with electric and natural gas operations. Direct, wholly owned nonregulated subsidiaries of MHC are Midwest Capital Group, Inc. and MEC Construction Services Co. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2018, and for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 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 and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2018 and for the three- and nine-month periods ended September 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 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 and is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2018 and for the three- and nine-month periods ended September 30, 2018 and 2017. The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017. The results of operations for the three- and nine-month periods ended September 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 nine-month period ended September 30, 2018.

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New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods beginning after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. The adoption of ASU No. 2018-14 will not have a material impact on the Company's Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In February 2018, the FASB issued ASU No. 2018-02, which amends FASB 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 did 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. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. 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 in the process of 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 August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-14, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this guidance remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. The updated disclosure requirements make a number of changes to improve the effectiveness of disclosures in the notes to the financial statements. This guidance is effective for annual reporting periods beginning after December 15, 2020, with early adoption permitted, and is required to be adopted retrospectively. The adoption of ASU No. 2018-14 will not have a material impact on PacifiCorp's 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. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. 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 in the process of 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. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. 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 in the process of 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 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. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 allowing companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings recognized in the period of adoption. 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 in the process of 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 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. During 2018, the FASB issued several ASUs that clarified the implementation guidance and provided optional transition practical expedients for ASU No. 2016-02 including ASU No. 2018-01 that allows companies to forgo evaluating existing land easements if they were not previously accounted for under ASC Topic 840, "Leases" and ASU No. 2018-11 that allows companies to apply the new guidance at the adoption date with the cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. 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 in the process of evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.

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Business Acquisitions (Notes)	9 Months Ended
Business Acquisitions (Notes)	Sep. 30, 2018
Business Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Business Acquisitions The Company completed various acquisitions totaling $105 million, net of cash acquired, for the nine-month period ended September 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 $1.1 billion, net of cash acquired, for the nine-month period ended September 30, 2017. The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses, development and construction costs for the 110-megawatt Alamo 6 solar project and the 50-megawatt Pearl solar project, and the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power. As a result of the various acquisitions, the Company acquired assets of $1.1 billion, assumed liabilities of $476 million and recognized goodwill of $522 million.

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Investments and Restricted Cash and Investments

9 Months Ended

Sep. 30, 2018

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
	September 30,		December 31,
	2018		2017
Investments:
BYD Company Limited common stock	$	1,616	$	1,961
Rabbi trusts	398		441
Other	186		124
Total investments	2,200		2,526

Equity method investments:
BHE Renewables tax equity investments	1,221		1,025
Electric Transmission Texas, LLC	530		524
Bridger Coal Company	116		137
Other	163		148
Total equity method investments	2,030		1,834

Restricted cash and cash equivalents and investments:
Quad Cities Station nuclear decommissioning trust funds	543		515
Restricted cash and cash equivalents	385		348
Total restricted cash and cash equivalents and investments	928		863

Total investments and restricted cash and cash equivalents and investments	$	5,158	$	5,223

Reflected as:
Current assets	$	404	$	351
Noncurrent assets	4,754		4,872
Total investments and restricted cash and cash equivalents and investments	$	5,158	$	5,223

Investments

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



	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Gains (losses) on marketable securities recognized during the period	$	260	$	(336	)
Less: Net gains recognized during the period on marketable securities sold during the period	—		1
Unrealized gains (losses) recognized during the period on marketable securities still held at the reporting date	$	260	$	(337	)

Equity Method Investments

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	1,016	$	935
Restricted cash and cash equivalents	358		327
Investments and restricted cash and cash equivalents and investments	28		21
Total cash and cash equivalents and restricted cash and cash equivalents	$	1,402	$	1,283

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Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2018

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



		As of
	Depreciable	September 30,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	75,751		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,295			7,176
		83,046			81,836
Accumulated depreciation and amortization		(25,566		)	(24,478		)
Regulated assets, net		57,480			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,551			6,010
Other assets	3-30 years	1,605			1,489
		8,156			7,499
Accumulated depreciation and amortization		(1,773		)	(1,542		)
Nonregulated assets, net		6,383			5,957

Net operating assets		63,863			63,315
Construction work-in-progress		3,724			2,556
Property, plant and equipment, net		$	67,587		$	65,871

Construction work-in-progress includes $3.2 billion as of September 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
		September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,500		$	12,107
Transmission	52-75 years	1,870			1,838
Electric distribution	20-75 years	3,519			3,380
Natural gas distribution	29-75 years	1,694			1,640
Utility plant in service		19,583			18,965
Accumulated depreciation and amortization		(5,850		)	(5,561		)
Utility plant in service, net		13,733			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,739			13,410
Construction work-in-progress		1,494			797
Property, plant and equipment, net		$	15,233		$	14,207

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



		As of
		September 30,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	28,201		$	27,880
Accumulated depreciation and amortization		(9,750		)	(9,366		)
Utility plant in-service, net		18,451			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	10			11
Plant, net		18,461			18,525
Construction work-in-progress		877			678
Property, plant and equipment, net		$	19,338		$	19,203

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,702		$	3,707
Distribution	20 - 65 years	3,373			3,314
Transmission	45 - 70 years	1,864			1,860
General and intangible plant	5 - 65 years	820			793
Utility plant		9,759			9,674
Accumulated depreciation and amortization		(3,026		)	(2,871		)
Utility plant, net		6,733			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	1			1
Plant, net		6,734			6,804
Construction work-in-progress		96			73
Property, plant and equipment, net		$	6,830		$	6,877

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,144		$	1,144
Electric distribution	20 - 100 years	1,518			1,459
Electric transmission	50 - 100 years	817			786
Electric general and intangible plant	5 - 70 years	191			181
Natural gas distribution	35 - 70 years	398			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	305			294
Utility plant		4,387			4,268
Accumulated depreciation and amortization		(1,573		)	(1,513		)
Utility plant, net		2,814			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,819			2,760
Construction work-in-progress		119			132
Property, plant and equipment, net		$	2,938		$	2,892

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Regulatory Matters	9 Months Ended
Regulatory Matters	Sep. 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. In October 2018, PacifiCorp filed an all-party settlement with the UPSC that continues the current rate reduction of $61 million, with other benefits provided to customers through a combination of a reduction to thermal steam plant and deferral to offset costs in the next general rate case. PacifiCorp filed a partial settlement with the Wyoming Public Service Commission ("WPSC") in April 2018 that provides a rate reduction of $23 million, or 3.3%, effective July 1, 2018 through June 30, 2019, with the remaining tax savings to be deferred with offsets to other costs. In June 2018, the WPSC approved the rate reduction on an interim basis. In May 2018, the Idaho Public Utilities Commission ("IPUC") approved an all-party settlement to implement a rate reduction of $6 million, or 2.2%, effective June 1, 2018 through May 31, 2019, to pass 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 WPSC and IPUC with the calculation of the full impact of the tax law change on revenue requirements. These reports initiated the next phase of the proceedings in these states. The WPSC scheduled a hearing for January 2019. A hearing has not yet been scheduled in Idaho. As of September 30, 2018, the estimated potential refund liability attributable to lower customer rates enabled by the benefits of tax reform was $112 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 extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. In September 2018, the PUCN issued an order directing Nevada Power to record the amortization of any excess protected accumulated deferred income tax arising from the 2017 Tax Reform as a regulatory liability effective January 1, 2018. 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 Las Vegas, LLC ("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. In September 2018, the PUCN granted relief requiring Nevada Power to credit $3 million as an offset against Wynn's remaining impact fee obligation. In October 2018, Wynn elected to pay the net present value lump sum of its Renewable Base Tariff Energy Rate obligation of $2 million, net of the credit of $3 million. The PUCN ordered Nevada Power to establish a regulatory liability and amortize the lump sum payment amount in equal monthly installments through December 2022. 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. In June 2018, Station Casinos LLC ("Station"), 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 October 2018, the PUCN approved a stipulation allowing Station to purchase energy from alternative providers subject to conditions, including paying an impact fee of $15 million.
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 extended the procedural schedule to allow parties additional discovery relevant to 2017 Tax Reform and a hearing was held in July 2018. In September 2018, the PUCN issued an order directing Sierra Pacific to record the amortization of any excess protected accumulated deferred income tax arising from the 2017 Tax Reform as a regulatory liability effective January 1, 2018. 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)

9 Months Ended

Sep. 30, 2018

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 September 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 September 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
	September 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 September 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 September 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
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	80	$	57
Restricted cash and cash equivalents included in other current assets	7		9
Total cash and cash equivalents and restricted cash and cash equivalents	$	87	$	66

Condensed Cash Flow Statements, Captions [Line Items]

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	308	$	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	$	323	$	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 $26 million previously recognized within investing cash flows to operating cash flows for the nine-month period ended September 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 September 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 September 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
	September 30		December 31
	2018		2017

Cash and cash equivalents	$	115	$	172
Restricted cash and cash equivalents in other current assets	68		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	183	$	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 September 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 September 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
	September 30,		December 31
	2018		2017

Cash and cash equivalents	$	115	$	172
Restricted cash and cash equivalents in other current assets	68		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	183	$	282

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Recent Financing Transactions	9 Months Ended
Recent Financing Transactions	Sep. 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

9 Months Ended

Sep. 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(19	)	(19	)	(29	)	(18	)
State income tax, net of federal income tax benefit	1		—		(6	)	(1	)
Income tax effect of foreign income	—		(3	)	(3	)	(4	)
Effects of ratemaking	(2	)	—		(3	)	—
Equity income	—		1		—		1
Other, net	1		1		1		—
Effective income tax rate	2	%	15	%	(19	)%	13	%

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. PacifiCorp recorded a current tax benefit and deferred tax expense of $21 million during the three-month period ended September 30, 2018 following clarified bonus depreciation guidance. As a result of 2017 Tax Reform and PacifiCorp's regulatory nature, PacifiCorp reduced the associated deferred income tax liabilities $8 million and increased regulatory liabilities by the same amount. The accounting will 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				Nine-Month Periods
	Ended September 30,				Ended September 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	(1	)	(2	)	(2	)	(2	)
Effective income tax rate	15	%	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. Sierra Pacific recorded a current tax benefit and deferred tax expense of $4 million during the three-month period ended September 30, 2018 following clarified bonus depreciation guidance. As a result of 2017 Tax Reform and Sierra Pacific's regulatory nature, Sierra Pacific reduced the associated deferred income tax liabilities $2 million and increased regulatory liabilities by the same amount. The accounting will 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Nondeductible expenses	5		—		4		—
Effects of ratemaking	1		—		—		—
Effective income tax rate	27	%	35	%	25	%	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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(95	)	(74	)	(97	)	(74	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(9	)	(7	)
Effects of ratemaking	(4	)	(2	)	(7	)	(4	)
Other, net	—		(1	)	(1	)	—
Effective income tax rate	(88	)%	(52	)%	(93	)%	(50	)%

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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(97	)	(76	)	(101	)	(76	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(10	)	(8	)
Effects of ratemaking	(5	)	(2	)	(7	)	(4	)
Effective income tax rate	(91	)%	(53	)%	(97	)%	(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 $248 million and $386 million for the nine-month periods ended September 30, 2018 and 2017, respectively.

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Employee Benefit Plans

9 Months Ended

Sep. 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	5		$	6		$	15		$	18
Interest cost	26			29			78			87
Expected return on plan assets	(41		)	(40		)	(123		)	(120		)
Net amortization	8			7			23			22
Net periodic benefit (credit) cost	$	(2	)	$	2		$	(7	)	$	7

Other postretirement:
Service cost	$	1		$	3		$	6		$	7
Interest cost	7			7			19			21
Expected return on plan assets	(9		)	(9		)	(31		)	(30		)
Net amortization	(3		)	(3		)	(9		)	(10		)
Net periodic benefit credit	$	(4	)	$	(2	)	$	(15	)	$	(12	)

Foreign Operations

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Service cost	$	5		$	6		$	15		$	19
Interest cost	14			15			42			44
Expected return on plan assets	(25		)	(25		)	(78		)	(74		)
Settlement	12			18			36			18
Net amortization	9			17			38			50
Net periodic benefit cost	$	15		$	31		$	53		$	57


	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 nine-month periods ended September 30, 2017 of $6 million and $17 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Pension:
Service cost	—		—		—		—
Interest cost	11		12		32		37
Expected return on plan assets	(18	)	(18	)	(54	)	(54	)
Net amortization	3		3		10		10
Net periodic benefit credit	(4	)	(3	)	(12	)	(7	)

Other postretirement:
Service cost	—		1		1		2
Interest cost	3		3		9		10
Expected return on plan assets	(5	)	(5	)	(16	)	(16	)
Net amortization	(1	)	(1	)	(4	)	(4	)
Net periodic benefit credit	(3	)	(2	)	(10	)	(8	)

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 September 30, 2018, $3 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 nine-month periods ended September 30, 2017, amounts other than the service cost for pension and other postretirement benefit plans totaling $4 million and $15 million have been reclassified to other, net in the Statements of Operations of the participating subsidiaries, of which $4 million and $14 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	2		$	2		$	6		$	7
Interest cost	7			8			21			23
Expected return on plan assets	(11		)	(11		)	(33		)	(33		)
Net amortization	1			—			2			1
Net periodic benefit credit	$	(1	)	$	(1	)	$	(4	)	$	(2	)

Other postretirement:
Service cost	$	1		$	2		$	4		$	4
Interest cost	2			3			6			7
Expected return on plan assets	(3		)	(3		)	(10		)	(10		)
Net amortization	(1		)	(1		)	(3		)	(3		)
Net periodic benefit credit	$	(1	)	$	1		$	(3	)	$	(2	)

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
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other long-term liabilities	$	(4	)	$	(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 receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):



	As of
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other assets	$	6		$	—
Other long-term liabilities	—			(2		)

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

Other Postretirement Plans:
Other long-term liabilities	(13		)	(20		)

XML 79 R43.htm IDEA: XBRL DOCUMENT

Asset Retirement Obligation Asset Retirement Obligations (Notes)	9 Months Ended
	Sep. 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 discontinued sending CCR to surface impoundments effective April 2018 and will 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 first quarter of 2019, 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.

XML 80 R44.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities

9 Months Ended

Sep. 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 September 30, 2018
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	10		$	4	$	6		$	—		$	20
Commodity liabilities	(6		)	2		(47		)	(74		)	(125		)
Total	4			6		(41		)	(74		)	(105		)

Total derivatives	4			6		(41		)	(74		)	(105		)
Cash collateral receivable	—			—		18			52			70
Total derivatives - net basis	$	4		$	6	$	(23	)	$	(22	)	$	(35	)

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 September 30, 2018 and December 31, 2017, a regulatory asset of $102 million and $101 million, respectively, was recorded related to the net derivative liability of $105 million and $104 million, respectively.



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Beginning balance	$	116		$	95		$	101		$	73
Changes in fair value recognized in net regulatory assets	14			6			48			36
Net (losses) gains reclassified to operating revenue	(36		)	(5		)	(30		)	8
Net gains (losses) reclassified to cost of fuel and energy	8			1			(17		)	(20		)
Ending balance	$	102		$	97		$	102		$	97

Derivative Contract Volumes

The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):



	Unit of	September 30,		December 31,
	Measure	2018		2017

Electricity sales	Megawatt hours	(7	)	(9	)
Natural gas purchases	Decatherms	115		113
Fuel oil purchases	Gallons	2		—

Credit Risk

Collateral and Contingent Features

XML 81 R45.htm IDEA: XBRL DOCUMENT

Fair Value Measurements

9 Months Ended

Sep. 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 September 30, 2018
Assets:
Commodity derivatives	$	—		$	53		$	99		$	(35	)	$	117
Interest rate derivatives	3			22			11			—			36
Mortgage loans held for sale	—			501			—			—			501
Money market mutual funds⁽²⁾	716			—			—			—			716
Debt securities:
United States government obligations	183			—			—			—			183
International government obligations	—			4			—			—			4
Corporate obligations	—			47			—			—			47
Municipal obligations	—			2			—			—			2
Equity securities:
United States companies	300			—			—			—			300
International companies	1,622			—			—			—			1,622
Investment funds	187			—			—			—			187
	$	3,011		$	629		$	110		$	(35	)	$	3,715
Liabilities:
Commodity derivatives	$	(1	)	$	(168	)	$	(15	)	$	110		$	(74	)
Interest rate derivatives	—			(5		)	(1		)	—			(6		)
	$	(1	)	$	(173	)	$	(16	)	$	110		$	(80	)



	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 $75 million and $76 million as of September 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
				Interest						Interest
	Commodity			Rate			Commodity			Rate
	Derivatives			Derivatives			Derivatives			Derivatives
2018:
Beginning balance	$	83		$	17		$	94		$	9
Changes included in earnings	(1		)	54			3			140
Changes in fair value recognized in OCI	1			—			1			—
Changes in fair value recognized in net regulatory assets	3			—			(11		)	—
Purchases	1			—			2			—
Settlements	(3		)	(61		)	(5		)	(139		)
Ending balance	$	84		$	10		$	84		$	10



2017:
Beginning balance	$	81		$	8		$	60		$	6
Changes included in earnings	7			34			19			100
Changes in fair value recognized in OCI	(1		)	—			(3		)	—
Changes in fair value recognized in net regulatory assets	(3		)	—			(5		)	—
Purchases	—			8			1			6
Settlements	2			(37		)	14			(99		)
Ending balance	$	86		$	13		$	86		$	13



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

Long-term debt	$	37,558	$	40,520	$	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 September 30, 2018
Assets:
Commodity derivatives	$	—	$	20		$	—	$	(10	)	$	10
Money market mutual funds⁽²⁾	310		—			—		—			310
Investment funds	26		—			—		—			26
	$	336	$	20		$	—	$	(10	)	$	346

Liabilities - Commodity derivatives	$	—	$	(125	)	$	—	$	80		$	(45	)

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 $70 million and $74 million as of September 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 three 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 three 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 September 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	7,014	$	7,862	$	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 September 30, 2018:
Assets:
Commodity derivatives	$	—	$	4		$	1		$	(2	)	$	3
Money market mutual funds⁽²⁾	88		—			—			—			88
Debt securities:
United States government obligations	183		—			—			—			183
International government obligations	—		4			—			—			4
Corporate obligations	—		47			—			—			47
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	300		—			—			—			300
International companies	6		—			—			—			6
Investment funds	21		—			—			—			21
	$	598	$	57		$	1		$	(2	)	$	654

Liabilities - commodity derivatives	$	—	$	(7	)	$	(2	)	$	3		$	(6	)



	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 September 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Beginning balance	$	(1	)	$	(1	)	$	3		$	(2	)
Changes in fair value recognized in net regulatory assets	(1		)	(2		)	(4		)	(2		)
Settlements	1			1			—			2
Ending balance	$	(1	)	$	(2	)	$	(1	)	$	(2	)



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

Long-term debt	$	5,380	$	5,612	$	5,042	$	5,686

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



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

Long-term debt	$	5,620	$	5,908	$	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 September 30, 2018
Assets:
Commodity derivatives	$	—	$	—	$	1		$	1
Money market mutual funds⁽¹⁾	67		—		—			67
Investment funds	2		—		—			2
	$	69	$	—	$	1		$	70

Liabilities - commodity derivatives	$	—	$	—	$	(8	)	$	(8	)

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

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


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

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

Beginning balance	$	(9	)	$	(4	)	$	(3	)	$	(14	)
Changes in fair value recognized in regulatory assets	2			(1		)	(6		)	(3		)
Settlements	—			1			2			13
Ending balance	$	(7	)	$	(4	)	$	(7	)	$	(4	)



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

Long-term debt	$	2,351	$	2,653	$	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 September 30, 2018
Assets - money market mutual funds⁽¹⁾	$	18	$	—	$	—		$	18

Liabilities - commodity derivatives	$	—	$	—	$	(1	)	$	(1	)

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 September 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					Nine-Month Periods
	Ended September 30,					Ended September 30,
	2018			2017		2018			2017

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



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

Long-term debt	$	1,120	$	1,153	$	1,120	$	1,221

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.

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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Commitments During the nine-month period ended September 30, 2018, PacifiCorp entered into non-cancelable agreements through 2045 totaling $1.0 billion related to power purchase agreements to meet customer requests for renewable energy, $566 million related to agreements for repowering certain existing wind facilities in Wyoming, Washington and Oregon and $273 million related to fuel supply contracts. The power purchase agreements are from facilities that have not yet achieved commercial operation. To the extent any of these facilities do not achieve commercial operation by contractually agreed upon dates, PacifiCorp has no obligation to the counterparty. During the nine-month period ended September 30, 2018, MidAmerican Energy entered into firm commitments totaling $563 million for the remainder of 2018 through 2020 related to the construction of wind-powered generating facilities. Easements During the nine-month period ended September 30, 2018, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $422 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. Maintenance and Service Contracts During the nine-month period ended September 30, 2018, MidAmerican Energy entered into non-cancelable maintenance and service contracts related to wind-powered generating facilities with minimum payment commitments totaling $226 million through 2028. 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 the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it is determined 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 nine-month period ended September 30, 2018, PacifiCorp entered into non-cancelable agreements through 2045 totaling $1.0 billion related to power purchase agreements to meet customer requests for renewable energy, $566 million related to agreements for repowering certain existing wind facilities in Wyoming, Washington and Oregon, and $273 million related to fuel supply contracts. The power purchase agreements are from facilities that have not yet achieved commercial operation. To the extent any of these facilities do not achieve commercial operation by contractually agreed upon dates, PacifiCorp has no obligation to the counterparty. 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 the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it is determined 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 Construction Commitments During the nine-month period ended September 30, 2018, MidAmerican Energy entered into firm commitments totaling $563 million for the remainder of 2018 through 2020 related to the construction of wind-powered generating facilities. Easements During the nine-month period ended September 30, 2018, MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $422 million through 2058 for land in Iowa on which some of its wind-powered generating facilities will be located. Maintenance and Service Contracts During the nine-month period ended September 30, 2018, MidAmerican Energy entered into non-cancelable maintenance and service contracts related to wind-powered generating facilities with minimum payment commitments totaling $226 million through 2028. 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 September 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, although it has opened a docket to consider concerns by certain stakeholders. 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)

9 Months Ended

Sep. 30, 2018


(11)	Revenue from Contracts with Customers

Adoption

Customer Revenue

Energy Products and Services



	For the Three-Month Period Ended September 30, 2018
	PacifiCorp			MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group			BHE Transmission		BHE Renewables		BHE and Other⁽¹⁾			Total
Customer Revenue:
Regulated:
Retail Electric	$	1,323		$	647	$	1,002	$	—	$	—		$	—	$	—	$	(1	)	$	2,971
Retail Gas	—			83		13		—		—			—		—		—			96
Wholesale⁽²⁾	(10		)	82		9		—		—			—		—		(1		)	80
Transmission and distribution	30			14		28		196		—			171		—		—			439
Interstate pipeline	—			—		—		—		283			—		—		(25		)	258
Other	—			—		—		—		—			—		—		—			—
Total Regulated	1,343			826		1,052		196		283			171		—		(27		)	3,844
Nonregulated	—			2		—		10		—			3		235		176			426
Total Customer Revenue	1,343			828		1,052		206		283			174		235		149			4,270
Other revenue⁽³⁾	26			4		7		27		(24		)	—		85		24			149
Total	$	1,369		$	832	$	1,059	$	233	$	259		$	174	$	320	$	173		$	4,419



	For the Nine-Month Period Ended September 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group			BHE Transmission		BHE Renewables		BHE and Other⁽¹⁾			Total
Customer Revenue:
Regulated:
Retail Electric	$	3,534	$	1,538	$	2,232	$	—	$	—		$	—	$	—	$	(1	)	$	7,303
Retail Gas	—		428		72		—		—			—		—		—			500
Wholesale	21		262		26		—		—			—		—		(3		)	306
Transmission and distribution	82		44		73		661		—			525		—		—			1,385
Interstate pipeline	—		—		—		—		893			—		—		(91		)	802
Other	—		—		1		—		—			—		—		—			1
Total Regulated	3,637		2,272		2,404		661		893			525		—		(95		)	10,297
Nonregulated	—		7		1		31		—			6		538		478			1,061
Total Customer Revenue	3,637		2,279		2,405		692		893			531		538		383			11,358
Other revenue⁽³⁾	109		18		21		65		(22		)	—		182		87			460
Total	$	3,746	$	2,297	$	2,426	$	757	$	871		$	531	$	720	$	470		$	11,818


(1)	The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations.


(2)	Includes net payments to counterparties for the financial settlement of certain non-derivative forward contracts for energy sales at PacifiCorp.


(3)	Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.

Real Estate Services

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



	HomeServices
	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Customer Revenue:
Brokerage	$	1,122	$	2,975
Franchise	18		52
Total Customer Revenue	1,140		3,027
Other revenue	78		225
Total	$	1,218	$	3,252

Contract Assets and Liabilities

Remaining Performance Obligations

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			Nine-Month Period
	Ended September 30,			Ended September 30,
	2018			2018
Customer Revenue:
Retail:
Residential	$	478		$	1,284
Commercial	418			1,129
Industrial	305			862
Other retail	106			204
Total retail	1,307			3,479
Wholesale ⁽¹⁾	(10		)	21
Transmission	30			82
Other Customer Revenue	16			55
Total Customer Revenue	1,343			3,637
Other revenue	26			109
Total operating revenue	$	1,369		$	3,746


(1)	During the three-month period ended September 30, 2018, PacifiCorp financially settled certain non-derivative forward contracts for energy sales by making net payments to counterparties.

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 nine-month periods ended September 30, 2018 (in millions):



	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	484	$	989
Commercial	135		340
Industrial	164		351
Other	7		18
Total fully bundled	790		1,698
Distribution only service	9		24
Total retail	799		1,722
Wholesale, transmission and other	15		38
Total Customer Revenue	814		1,760
Other revenue	6		17
Total revenue	$	820	$	1,777

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						Nine-Month Period
	Ended September 30,						Ended September 30,
	2018						2018
	Electric		Gas		Total		Electric		Gas		Total
Customer Revenue:
Retail:
Residential	$	76	$	9	$	85	$	203	$	48	$	251
Commercial	75		3		78		190		18		208
Industrial	59		1		60		136		6		142
Other	2		—		2		5		—		5
Total fully bundled	212		13		225		534		72		606
Distribution only service	1		—		1		3		—		3
Total retail	213		13		226		537		72		609
Wholesale, transmission and other	12		1		13		35		1		36
Total Customer Revenue	225		14		239		572		73		645
Other revenue	—		—		—		3		1		4
Total revenue	$	225	$	14	$	239	$	575	$	74	$	649

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



	For the Three-Month Period Ended September 30, 2018
	Electric		Natural Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	233	$	54	$	—	$	287
Commercial	100		17		—		117
Industrial	268		3		—		271
Natural gas transportation services	—		8		—		8
Other retail	46		1		—		47
Total retail	647		83		—		730
Wholesale	62		20		—		82
Multi-value transmission projects	14		—		—		14
Other Customer Revenue	—		—		2		2
Total Customer Revenue	723		103		2		828
Other revenue	4		—		—		4
Total operating revenue	$	727	$	103	$	2	$	832



	For the Nine-Month Period Ended September 30, 2018
	Electric		Natural Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	567	$	287	$	—	$	854
Commercial	251		100		—		351
Industrial	608		13		—		621
Natural gas transportation services	—		27		—		27
Other retail	113		1		—		114
Total retail	1,539		428		—		1,967
Wholesale	187		75		—		262
Multi-value transmission projects	43		—		—		43
Other Customer Revenue	—		—		5		5
Total Customer Revenue	1,769		503		5		2,277
Other revenue	16		2		—		18
Total operating revenue	$	1,785	$	505	$	5	$	2,295

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

9 Months Ended

Sep. 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)	16			535			542			(5		)	1,088
Balance, September 30, 2017	$	(431	)	$	(1,140	)	$	1,127		$	21		$	(423	)

Balance, December 31, 2017	$	(383	)	$	(1,129	)	$	1,085		$	29		$	(398	)
Adoption of ASU 2016-01	—			—			(1,085		)	—			(1,085		)
Other comprehensive income (loss)	50			(236		)	—			2			(184		)
Balance, September 30, 2018	$	(333	)	$	(1,365	)	$	—		$	31		$	(1,667	)

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

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Segment Information

9 Months Ended

Sep. 30, 2018

Segment Information



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Operating revenue:
PacifiCorp	$	1,369	$	1,430	$	3,746	$	3,956
MidAmerican Funding	832		815		2,297		2,170
NV Energy	1,059		1,047		2,426		2,384
Northern Powergrid	233		221		757		685
BHE Pipeline Group	259		193		871		700
BHE Transmission	174		182		531		506
BHE Renewables	320		283		720		647
HomeServices	1,218		961		3,252		2,502
BHE and Other⁽¹⁾	173		151		470		453
Total operating revenue	$	5,637	$	5,283	$	15,070	$	14,003



	Three-Month Periods					Nine-Month Periods
	Ended September 30,					Ended September 30,
	2018			2017		2018			2017
Depreciation and amortization:
PacifiCorp	$	203		$	200	$	602		$	598
MidAmerican Funding	133			112		499			370
NV Energy	114			105		341			315
Northern Powergrid	62			55		189			156
BHE Pipeline Group	27			42		99			115
BHE Transmission	61			58		184			165
BHE Renewables	68			63		198			187
HomeServices	14			16		37			38
BHE and Other⁽¹⁾	(1		)	—		(2		)	(1		)
Total depreciation and amortization	$	681		$	651	$	2,147		$	1,943



Operating income:
PacifiCorp	$	386		$	461		$	917		$	1,133
MidAmerican Funding	278			284			444			517
NV Energy	307			393			540			683
Northern Powergrid	102			106			360			346
BHE Pipeline Group	105			66			388			328
BHE Transmission	82			86			244			236
BHE Renewables	176			157			308			256
HomeServices	85			79			185			191
BHE and Other⁽¹⁾	2			8			(20		)	(38		)
Total operating income	1,523			1,640			3,366			3,652
Interest expense	(453		)	(464		)	(1,380		)	(1,379		)
Capitalized interest	17			14			44			34
Allowance for equity funds	30			24			75			59
Interest and dividend income	27			32			85			85
Gains (losses) on marketable securities, net	260			3			(336		)	8
Other, net	19			(17		)	50			8
Total income before income tax expense and equity income	$	1,423		$	1,232		$	1,904		$	2,467



Interest expense:
PacifiCorp	$	96	$	95	$	288	$	285
MidAmerican Funding	61		59		185		177
NV Energy	52		57		169		173
Northern Powergrid	34		34		107		98
BHE Pipeline Group	11		11		31		33
BHE Transmission	42		45		127		125
BHE Renewables	49		51		150		153
HomeServices	6		1		16		3
BHE and Other⁽¹⁾	102		111		307		332
Total interest expense	$	453	$	464	$	1,380	$	1,379



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Operating revenue by country:
United States	$	5,209	$	4,869	$	13,757	$	12,793
United Kingdom	232		221		754		685
Canada	174		182		531		506
Philippines and other	22		11		28		19
Total operating revenue by country	$	5,637	$	5,283	$	15,070	$	14,003



Income before income tax expense and equity income by country:
United States	$	1,290	$	1,113	$	1,501	$	2,065
United Kingdom	59		49		220		213
Canada	43		47		125		127
Philippines and other	31		23		58		62
Total income before income tax expense and equity income by country	$	1,423	$	1,232	$	1,904	$	2,467



	As of
	September 30,		December 31,
	2018		2017
Assets:
PacifiCorp	$	23,501	$	23,086
MidAmerican Funding	19,499		18,444
NV Energy	14,078		13,903
Northern Powergrid	7,527		7,565
BHE Pipeline Group	5,285		5,134
BHE Transmission	8,863		9,009
BHE Renewables	8,590		7,687
HomeServices	2,860		2,722
BHE and Other⁽¹⁾	1,659		2,658
Total assets	$	91,862	$	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 nine-month period ended September 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																	70		70
Foreign currency translation							(24		)			(41		)					(65		)
September 30, 2018	$	1,129	$	2,102	$	2,369	$	967		$	73	$	1,530		$	95	$	1,418	$	9,683

Segment Information

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	727		$	707		$	1,785		$	1,677
Regulated natural gas	103			103			505			485
Other	2			3			5			4
Total operating revenue	$	832		$	813		$	2,295		$	2,166

Operating income:
Regulated electric	$	278		$	287		$	392		$	475
Regulated natural gas	1			(3		)	52			41
Other	(1		)	—			—			—
Total operating income	278			284			444			516
Interest expense	(56		)	(54		)	(170		)	(160		)
Allowance for borrowed funds	6			4			14			9
Allowance for equity funds	16			11			39			25
Other, net	13			9			34			27
Income before income tax benefit	$	257		$	254		$	361		$	417



	As of
	September 30, 2018		December 31, 2017
Assets:
Regulated electric	$	16,066	$	14,914
Regulated natural gas	1,322		1,403
Other	—		1
Total assets	$	17,388	$	16,318

Segment Information

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	727		$	707		$	1,785		$	1,677
Regulated natural gas	103			103			505			485
Other	2			5			7			8
Total operating revenue	$	832		$	815		$	2,297		$	2,170

Operating income:
Regulated electric	$	278		$	287		$	392		$	475
Regulated natural gas	1			(3		)	52			41
Other	(1		)	—			—			1
Total operating income	278			284			444			517
Interest expense	(61		)	(59		)	(185		)	(177		)
Allowance for borrowed funds	6			4			14			9
Allowance for equity funds	16			11			39			25
Other, net	12			10			35			28
Income before income tax benefit	$	251		$	250		$	347		$	402



	As of
	September 30, 2018		December 31, 2017
Assets⁽¹⁾:
Regulated electric	$	17,257	$	16,105
Regulated natural gas	1,401		1,482
Other	13		34
Total assets	$	18,671	$	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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	225		$	215		$	575		$	534
Regulated natural gas	14			15			74			66
Total operating revenue	$	239		$	230		$	649		$	600

Operating income:
Regulated electric	$	56		$	71		$	111		$	141
Regulated natural gas	—			3			11			15
Total operating income	56			74			122			156
Interest expense	(12		)	(11		)	(33		)	(33		)
Allowance for borrowed funds	—			1			1			1
Allowance for equity funds	1			1			3			2
Other, net	3			3			8			5
Income before income tax expense	$	48		$	68		$	101		$	131



	As of
	September 30,		December 31,
	2018		2017
Assets:
Regulated electric	$	3,131	$	3,103
Regulated natural gas	300		300
Regulated common assets⁽¹⁾	85		10
Total assets	$	3,516	$	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)	9 Months Ended
	Sep. 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 nine-month periods ended September 30, 2018 and 2017, PacifiCorp made net cash payments for federal and state income tax to BHE totaling $21 million and $205 million, respectively.

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BHE Shareholders' Equity (Notes)

9 Months Ended

Sep. 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)	9 Months Ended
	Sep. 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 September 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 September 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.

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Investments and Restricted Cash and Investments (Tables)

9 Months Ended

Sep. 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
	September 30,		December 31,
	2018		2017
Investments:
BYD Company Limited common stock	$	1,616	$	1,961
Rabbi trusts	398		441
Other	186		124
Total investments	2,200		2,526

Equity method investments:
BHE Renewables tax equity investments	1,221		1,025
Electric Transmission Texas, LLC	530		524
Bridger Coal Company	116		137
Other	163		148
Total equity method investments	2,030		1,834

Restricted cash and cash equivalents and investments:
Quad Cities Station nuclear decommissioning trust funds	543		515
Restricted cash and cash equivalents	385		348
Total restricted cash and cash equivalents and investments	928		863

Total investments and restricted cash and cash equivalents and investments	$	5,158	$	5,223

Reflected as:
Current assets	$	404	$	351
Noncurrent assets	4,754		4,872
Total investments and restricted cash and cash equivalents and investments	$	5,158	$	5,223

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

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



	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Gains (losses) on marketable securities recognized during the period	$	260	$	(336	)
Less: Net gains recognized during the period on marketable securities sold during the period	—		1
Unrealized gains (losses) recognized during the period on marketable securities still held at the reporting date	$	260	$	(337	)

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Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Table Text Block]

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



		As of
	Depreciable	September 30,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	75,751		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,295			7,176
		83,046			81,836
Accumulated depreciation and amortization		(25,566		)	(24,478		)
Regulated assets, net		57,480			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,551			6,010
Other assets	3-30 years	1,605			1,489
		8,156			7,499
Accumulated depreciation and amortization		(1,773		)	(1,542		)
Nonregulated assets, net		6,383			5,957

Net operating assets		63,863			63,315
Construction work-in-progress		3,724			2,556
Property, plant and equipment, net		$	67,587		$	65,871

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



		As of
		September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,500		$	12,107
Transmission	52-75 years	1,870			1,838
Electric distribution	20-75 years	3,519			3,380
Natural gas distribution	29-75 years	1,694			1,640
Utility plant in service		19,583			18,965
Accumulated depreciation and amortization		(5,850		)	(5,561		)
Utility plant in service, net		13,733			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,739			13,410
Construction work-in-progress		1,494			797
Property, plant and equipment, net		$	15,233		$	14,207

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



		As of
		September 30,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	28,201		$	27,880
Accumulated depreciation and amortization		(9,750		)	(9,366		)
Utility plant in-service, net		18,451			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	10			11
Plant, net		18,461			18,525
Construction work-in-progress		877			678
Property, plant and equipment, net		$	19,338		$	19,203

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,702		$	3,707
Distribution	20 - 65 years	3,373			3,314
Transmission	45 - 70 years	1,864			1,860
General and intangible plant	5 - 65 years	820			793
Utility plant		9,759			9,674
Accumulated depreciation and amortization		(3,026		)	(2,871		)
Utility plant, net		6,733			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	1			1
Plant, net		6,734			6,804
Construction work-in-progress		96			73
Property, plant and equipment, net		$	6,830		$	6,877

Condensed Cash Flow Statements, Captions [Line Items]

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



		As of
	Depreciable Life	September 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,144		$	1,144
Electric distribution	20 - 100 years	1,518			1,459
Electric transmission	50 - 100 years	817			786
Electric general and intangible plant	5 - 70 years	191			181
Natural gas distribution	35 - 70 years	398			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	305			294
Utility plant		4,387			4,268
Accumulated depreciation and amortization		(1,573		)	(1,513		)
Utility plant, net		2,814			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,819			2,760
Construction work-in-progress		119			132
Property, plant and equipment, net		$	2,938		$	2,892

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

9 Months Ended

Sep. 30, 2018

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

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents



	As of
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	1,016	$	935
Restricted cash and cash equivalents	358		327
Investments and restricted cash and cash equivalents and investments	28		21
Total cash and cash equivalents and restricted cash and cash equivalents	$	1,402	$	1,283

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 September 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
	September 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]



	As of
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	80	$	57
Restricted cash and cash equivalents included in other current assets	7		9
Total cash and cash equivalents and restricted cash and cash equivalents	$	87	$	66

Condensed Cash Flow Statements, Captions [Line Items]

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



	As of
	September 30,		December 31,
	2018		2017
Cash and cash equivalents	$	308	$	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	$	323	$	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 $26 million previously recognized within investing cash flows to operating cash flows for the nine-month period ended September 30, 2017.

Condensed Cash Flow Statements, Captions [Line Items]

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



	As of
	September 30		December 31
	2018		2017

Cash and cash equivalents	$	115	$	172
Restricted cash and cash equivalents in other current assets	68		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	183	$	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 September 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
	September 30,		December 31
	2018		2017

Cash and cash equivalents	$	115	$	172
Restricted cash and cash equivalents in other current assets	68		110
Total cash and cash equivalents and restricted cash and cash equivalents	$	183	$	282

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Income Taxes (Tables)

9 Months Ended

Sep. 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(19	)	(19	)	(29	)	(18	)
State income tax, net of federal income tax benefit	1		—		(6	)	(1	)
Income tax effect of foreign income	—		(3	)	(3	)	(4	)
Effects of ratemaking	(2	)	—		(3	)	—
Equity income	—		1		—		1
Other, net	1		1		1		—
Effective income tax rate	2	%	15	%	(19	)%	13	%

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



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(19	)	(19	)	(29	)	(18	)
State income tax, net of federal income tax benefit	1		—		(6	)	(1	)
Income tax effect of foreign income	—		(3	)	(3	)	(4	)
Effects of ratemaking	(2	)	—		(3	)	—
Equity income	—		1		—		1
Other, net	1		1		1		—
Effective income tax rate	2	%	15	%	(19	)%	13	%

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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Nondeductible expenses	3		—		3		—
Effects of ratemaking	1		—		—		—
Other	(1	)	2		—		1
Effective income tax rate	24	%	37	%	24	%	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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Nondeductible expenses	3		—		3		—
Effects of ratemaking	1		—		—		—
Other	(1	)	2		—		1
Effective income tax rate	24	%	37	%	24	%	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. Sierra Pacific recorded a current tax benefit and deferred tax expense of $4 million during the three-month period ended September 30, 2018 following clarified bonus depreciation guidance. As a result of 2017 Tax Reform and Sierra Pacific's regulatory nature, Sierra Pacific reduced the associated deferred income tax liabilities $2 million and increased regulatory liabilities by the same amount. The accounting will 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Nondeductible expenses	5		—		4		—
Effects of ratemaking	1		—		—		—
Effective income tax rate	27	%	35	%	25	%	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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Nondeductible expenses	5		—		4		—
Effects of ratemaking	1		—		—		—
Effective income tax rate	27	%	35	%	25	%	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. PacifiCorp recorded a current tax benefit and deferred tax expense of $21 million during the three-month period ended September 30, 2018 following clarified bonus depreciation guidance. As a result of 2017 Tax Reform and PacifiCorp's regulatory nature, PacifiCorp reduced the associated deferred income tax liabilities $8 million and increased regulatory liabilities by the same amount. The accounting will 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				Nine-Month Periods
	Ended September 30,				Ended September 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	(1	)	(2	)	(2	)	(2	)
Effective income tax rate	15	%	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				Nine-Month Periods
	Ended September 30,				Ended September 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	(1	)	(2	)	(2	)	(2	)
Effective income tax rate	15	%	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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(95	)	(74	)	(97	)	(74	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(9	)	(7	)
Effects of ratemaking	(4	)	(2	)	(7	)	(4	)
Other, net	—		(1	)	(1	)	—
Effective income tax rate	(88	)%	(52	)%	(93	)%	(50	)%

A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows:



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(95	)	(74	)	(97	)	(74	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(9	)	(7	)
Effects of ratemaking	(4	)	(2	)	(7	)	(4	)
Other, net	—		(1	)	(1	)	—
Effective income tax rate	(88	)%	(52	)%	(93	)%	(50	)%

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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(97	)	(76	)	(101	)	(76	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(10	)	(8	)
Effects of ratemaking	(5	)	(2	)	(7	)	(4	)
Effective income tax rate	(91	)%	(53	)%	(97	)%	(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 $248 million and $386 million for the nine-month periods ended September 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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017

Federal statutory income tax rate	21	%	35	%	21	%	35	%
Income tax credits	(97	)	(76	)	(101	)	(76	)
State income tax, net of federal income tax benefit	(10	)	(10	)	(10	)	(8	)
Effects of ratemaking	(5	)	(2	)	(7	)	(4	)
Effective income tax rate	(91	)%	(53	)%	(97	)%	(53	)%

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Defined Benefit Plans Disclosures

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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	5		$	6		$	15		$	18
Interest cost	26			29			78			87
Expected return on plan assets	(41		)	(40		)	(123		)	(120		)
Net amortization	8			7			23			22
Net periodic benefit (credit) cost	$	(2	)	$	2		$	(7	)	$	7

Other postretirement:
Service cost	$	1		$	3		$	6		$	7
Interest cost	7			7			19			21
Expected return on plan assets	(9		)	(9		)	(31		)	(30		)
Net amortization	(3		)	(3		)	(9		)	(10		)
Net periodic benefit credit	$	(4	)	$	(2	)	$	(15	)	$	(12	)

Foreign Operations

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Service cost	$	5		$	6		$	15		$	19
Interest cost	14			15			42			44
Expected return on plan assets	(25		)	(25		)	(78		)	(74		)
Settlement	12			18			36			18
Net amortization	9			17			38			50
Net periodic benefit cost	$	15		$	31		$	53		$	57

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				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Pension:
Service cost	—		—		—		—
Interest cost	11		12		32		37
Expected return on plan assets	(18	)	(18	)	(54	)	(54	)
Net amortization	3		3		10		10
Net periodic benefit credit	(4	)	(3	)	(12	)	(7	)

Other postretirement:
Service cost	—		1		1		2
Interest cost	3		3		9		10
Expected return on plan assets	(5	)	(5	)	(16	)	(16	)
Net amortization	(1	)	(1	)	(4	)	(4	)
Net periodic benefit credit	(3	)	(2	)	(10	)	(8	)

Schedule of Defined Benefit Plans Disclosures

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	2		$	2		$	6		$	7
Interest cost	7			8			21			23
Expected return on plan assets	(11		)	(11		)	(33		)	(33		)
Net amortization	1			—			2			1
Net periodic benefit credit	$	(1	)	$	(1	)	$	(4	)	$	(2	)

Other postretirement:
Service cost	$	1		$	2		$	4		$	4
Interest cost	2			3			6			7
Expected return on plan assets	(3		)	(3		)	(10		)	(10		)
Net amortization	(1		)	(1		)	(3		)	(3		)
Net periodic benefit credit	$	(1	)	$	1		$	(3	)	$	(2	)

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
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other long-term liabilities	$	(4	)	$	(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 receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):



	As of
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other assets	$	6		$	—
Other long-term liabilities	—			(2		)

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

Other Postretirement Plans:
Other long-term liabilities	(13		)	(20		)

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

9 Months Ended

Sep. 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 September 30, 2018
Not designated as hedging contracts⁽¹⁾:
Commodity assets	$	10		$	4	$	6		$	—		$	20
Commodity liabilities	(6		)	2		(47		)	(74		)	(125		)
Total	4			6		(41		)	(74		)	(105		)

Total derivatives	4			6		(41		)	(74		)	(105		)
Cash collateral receivable	—			—		18			52			70
Total derivatives - net basis	$	4		$	6	$	(23	)	$	(22	)	$	(35	)

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 September 30, 2018 and December 31, 2017, a regulatory asset of $102 million and $101 million, respectively, was recorded related to the net derivative liability of $105 million and $104 million, respectively.

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Beginning balance	$	116		$	95		$	101		$	73
Changes in fair value recognized in net regulatory assets	14			6			48			36
Net (losses) gains reclassified to operating revenue	(36		)	(5		)	(30		)	8
Net gains (losses) reclassified to cost of fuel and energy	8			1			(17		)	(20		)
Ending balance	$	102		$	97		$	102		$	97

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):



	Unit of	September 30,		December 31,
	Measure	2018		2017

Electricity sales	Megawatt hours	(7	)	(9	)
Natural gas purchases	Decatherms	115		113
Fuel oil purchases	Gallons	2		—

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 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 September 30, 2018
Assets:
Commodity derivatives	$	—		$	53		$	99		$	(35	)	$	117
Interest rate derivatives	3			22			11			—			36
Mortgage loans held for sale	—			501			—			—			501
Money market mutual funds⁽²⁾	716			—			—			—			716
Debt securities:
United States government obligations	183			—			—			—			183
International government obligations	—			4			—			—			4
Corporate obligations	—			47			—			—			47
Municipal obligations	—			2			—			—			2
Equity securities:
United States companies	300			—			—			—			300
International companies	1,622			—			—			—			1,622
Investment funds	187			—			—			—			187
	$	3,011		$	629		$	110		$	(35	)	$	3,715
Liabilities:
Commodity derivatives	$	(1	)	$	(168	)	$	(15	)	$	110		$	(74	)
Interest rate derivatives	—			(5		)	(1		)	—			(6		)
	$	(1	)	$	(173	)	$	(16	)	$	110		$	(80	)



	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 $75 million and $76 million as of September 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
				Interest						Interest
	Commodity			Rate			Commodity			Rate
	Derivatives			Derivatives			Derivatives			Derivatives
2018:
Beginning balance	$	83		$	17		$	94		$	9
Changes included in earnings	(1		)	54			3			140
Changes in fair value recognized in OCI	1			—			1			—
Changes in fair value recognized in net regulatory assets	3			—			(11		)	—
Purchases	1			—			2			—
Settlements	(3		)	(61		)	(5		)	(139		)
Ending balance	$	84		$	10		$	84		$	10



2017:
Beginning balance	$	81		$	8		$	60		$	6
Changes included in earnings	7			34			19			100
Changes in fair value recognized in OCI	(1		)	—			(3		)	—
Changes in fair value recognized in net regulatory assets	(3		)	—			(5		)	—
Purchases	—			8			1			6
Settlements	2			(37		)	14			(99		)
Ending balance	$	86		$	13		$	86		$	13

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



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

Long-term debt	$	37,558	$	40,520	$	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 September 30, 2018
Assets:
Commodity derivatives	$	—	$	—	$	1		$	1
Money market mutual funds⁽¹⁾	67		—		—			67
Investment funds	2		—		—			2
	$	69	$	—	$	1		$	70

Liabilities - commodity derivatives	$	—	$	—	$	(8	)	$	(8	)

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

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


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

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Beginning balance	$	(9	)	$	(4	)	$	(3	)	$	(14	)
Changes in fair value recognized in regulatory assets	2			(1		)	(6		)	(3		)
Settlements	—			1			2			13
Ending balance	$	(7	)	$	(4	)	$	(7	)	$	(4	)

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



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

Long-term debt	$	2,351	$	2,653	$	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 September 30, 2018
Assets:
Commodity derivatives	$	—	$	20		$	—	$	(10	)	$	10
Money market mutual funds⁽²⁾	310		—			—		—			310
Investment funds	26		—			—		—			26
	$	336	$	20		$	—	$	(10	)	$	346

Liabilities - Commodity derivatives	$	—	$	(125	)	$	—	$	80		$	(45	)

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 $70 million and $74 million as of September 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 September 30, 2018				As of December 31, 2017
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value

Long-term debt	$	7,014	$	7,862	$	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 September 30, 2018:
Assets:
Commodity derivatives	$	—	$	4		$	1		$	(2	)	$	3
Money market mutual funds⁽²⁾	88		—			—			—			88
Debt securities:
United States government obligations	183		—			—			—			183
International government obligations	—		4			—			—			4
Corporate obligations	—		47			—			—			47
Municipal obligations	—		2			—			—			2
Equity securities:
United States companies	300		—			—			—			300
International companies	6		—			—			—			6
Investment funds	21		—			—			—			21
	$	598	$	57		$	1		$	(2	)	$	654

Liabilities - commodity derivatives	$	—	$	(7	)	$	(2	)	$	3		$	(6	)



	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 September 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017

Beginning balance	$	(1	)	$	(1	)	$	3		$	(2	)
Changes in fair value recognized in net regulatory assets	(1		)	(2		)	(4		)	(2		)
Settlements	1			1			—			2
Ending balance	$	(1	)	$	(2	)	$	(1	)	$	(2	)



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

Long-term debt	$	5,380	$	5,612	$	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 September 30, 2018				As of December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt	$	5,620	$	5,908	$	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 September 30, 2018
Assets - money market mutual funds⁽¹⁾	$	18	$	—	$	—		$	18

Liabilities - commodity derivatives	$	—	$	—	$	(1	)	$	(1	)

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					Nine-Month Periods
	Ended September 30,					Ended September 30,
	2018			2017		2018			2017

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

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



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

Long-term debt	$	1,120	$	1,153	$	1,120	$	1,221

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

9 Months Ended

Sep. 30, 2018

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



	For the Three-Month Period Ended September 30, 2018
	PacifiCorp			MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group			BHE Transmission		BHE Renewables		BHE and Other⁽¹⁾			Total
Customer Revenue:
Regulated:
Retail Electric	$	1,323		$	647	$	1,002	$	—	$	—		$	—	$	—	$	(1	)	$	2,971
Retail Gas	—			83		13		—		—			—		—		—			96
Wholesale⁽²⁾	(10		)	82		9		—		—			—		—		(1		)	80
Transmission and distribution	30			14		28		196		—			171		—		—			439
Interstate pipeline	—			—		—		—		283			—		—		(25		)	258
Other	—			—		—		—		—			—		—		—			—
Total Regulated	1,343			826		1,052		196		283			171		—		(27		)	3,844
Nonregulated	—			2		—		10		—			3		235		176			426
Total Customer Revenue	1,343			828		1,052		206		283			174		235		149			4,270
Other revenue⁽³⁾	26			4		7		27		(24		)	—		85		24			149
Total	$	1,369		$	832	$	1,059	$	233	$	259		$	174	$	320	$	173		$	4,419



	For the Nine-Month Period Ended September 30, 2018
	PacifiCorp		MidAmerican Funding		NV Energy		Northern Powergrid		BHE Pipeline Group			BHE Transmission		BHE Renewables		BHE and Other⁽¹⁾			Total
Customer Revenue:
Regulated:
Retail Electric	$	3,534	$	1,538	$	2,232	$	—	$	—		$	—	$	—	$	(1	)	$	7,303
Retail Gas	—		428		72		—		—			—		—		—			500
Wholesale	21		262		26		—		—			—		—		(3		)	306
Transmission and distribution	82		44		73		661		—			525		—		—			1,385
Interstate pipeline	—		—		—		—		893			—		—		(91		)	802
Other	—		—		1		—		—			—		—		—			1
Total Regulated	3,637		2,272		2,404		661		893			525		—		(95		)	10,297
Nonregulated	—		7		1		31		—			6		538		478			1,061
Total Customer Revenue	3,637		2,279		2,405		692		893			531		538		383			11,358
Other revenue⁽³⁾	109		18		21		65		(22		)	—		182		87			460
Total	$	3,746	$	2,297	$	2,426	$	757	$	871		$	531	$	720	$	470		$	11,818

HomeServices [Member]

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



	HomeServices
	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Customer Revenue:
Brokerage	$	1,122	$	2,975
Franchise	18		52
Total Customer Revenue	1,140		3,027
Other revenue	78		225
Total	$	1,218	$	3,252



	Three-Month Period			Nine-Month Period
	Ended September 30,			Ended September 30,
	2018			2018
Customer Revenue:
Retail:
Residential	$	478		$	1,284
Commercial	418			1,129
Industrial	305			862
Other retail	106			204
Total retail	1,307			3,479
Wholesale ⁽¹⁾	(10		)	21
Transmission	30			82
Other Customer Revenue	16			55
Total Customer Revenue	1,343			3,637
Other revenue	26			109
Total operating revenue	$	1,369		$	3,746

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



	Three-Month Period		Nine-Month Period
	Ended September 30,		Ended September 30,
	2018		2018
Customer Revenue:
Retail:
Residential	$	484	$	989
Commercial	135		340
Industrial	164		351
Other	7		18
Total fully bundled	790		1,698
Distribution only service	9		24
Total retail	799		1,722
Wholesale, transmission and other	15		38
Total Customer Revenue	814		1,760
Other revenue	6		17
Total revenue	$	820	$	1,777



	Three-Month Period						Nine-Month Period
	Ended September 30,						Ended September 30,
	2018						2018
	Electric		Gas		Total		Electric		Gas		Total
Customer Revenue:
Retail:
Residential	$	76	$	9	$	85	$	203	$	48	$	251
Commercial	75		3		78		190		18		208
Industrial	59		1		60		136		6		142
Other	2		—		2		5		—		5
Total fully bundled	212		13		225		534		72		606
Distribution only service	1		—		1		3		—		3
Total retail	213		13		226		537		72		609
Wholesale, transmission and other	12		1		13		35		1		36
Total Customer Revenue	225		14		239		572		73		645
Other revenue	—		—		—		3		1		4
Total revenue	$	225	$	14	$	239	$	575	$	74	$	649

Accumulated Other Comprehensive Income (Loss) [Line Items]



	For the Three-Month Period Ended September 30, 2018
	Electric		Natural Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	233	$	54	$	—	$	287
Commercial	100		17		—		117
Industrial	268		3		—		271
Natural gas transportation services	—		8		—		8
Other retail	46		1		—		47
Total retail	647		83		—		730
Wholesale	62		20		—		82
Multi-value transmission projects	14		—		—		14
Other Customer Revenue	—		—		2		2
Total Customer Revenue	723		103		2		828
Other revenue	4		—		—		4
Total operating revenue	$	727	$	103	$	2	$	832



	For the Nine-Month Period Ended September 30, 2018
	Electric		Natural Gas		Other		Total
Customer Revenue:
Retail:
Residential	$	567	$	287	$	—	$	854
Commercial	251		100		—		351
Industrial	608		13		—		621
Natural gas transportation services	—		27		—		27
Other retail	113		1		—		114
Total retail	1,539		428		—		1,967
Wholesale	187		75		—		262
Multi-value transmission projects	43		—		—		43
Other Customer Revenue	—		—		5		5
Total Customer Revenue	1,769		503		5		2,277
Other revenue	16		2		—		18
Total operating revenue	$	1,785	$	505	$	5	$	2,295

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Components of Accumulated Other Comprehensive Loss, Net (Tables)

9 Months Ended

Sep. 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)	16			535			542			(5		)	1,088
Balance, September 30, 2017	$	(431	)	$	(1,140	)	$	1,127		$	21		$	(423	)

Balance, December 31, 2017	$	(383	)	$	(1,129	)	$	1,085		$	29		$	(398	)
Adoption of ASU 2016-01	—			—			(1,085		)	—			(1,085		)
Other comprehensive income (loss)	50			(236		)	—			2			(184		)
Balance, September 30, 2018	$	(333	)	$	(1,365	)	$	—		$	31		$	(1,667	)

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Segment Reporting Information, by Segment



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Operating revenue:
PacifiCorp	$	1,369	$	1,430	$	3,746	$	3,956
MidAmerican Funding	832		815		2,297		2,170
NV Energy	1,059		1,047		2,426		2,384
Northern Powergrid	233		221		757		685
BHE Pipeline Group	259		193		871		700
BHE Transmission	174		182		531		506
BHE Renewables	320		283		720		647
HomeServices	1,218		961		3,252		2,502
BHE and Other⁽¹⁾	173		151		470		453
Total operating revenue	$	5,637	$	5,283	$	15,070	$	14,003



	Three-Month Periods					Nine-Month Periods
	Ended September 30,					Ended September 30,
	2018			2017		2018			2017
Depreciation and amortization:
PacifiCorp	$	203		$	200	$	602		$	598
MidAmerican Funding	133			112		499			370
NV Energy	114			105		341			315
Northern Powergrid	62			55		189			156
BHE Pipeline Group	27			42		99			115
BHE Transmission	61			58		184			165
BHE Renewables	68			63		198			187
HomeServices	14			16		37			38
BHE and Other⁽¹⁾	(1		)	—		(2		)	(1		)
Total depreciation and amortization	$	681		$	651	$	2,147		$	1,943



Operating income:
PacifiCorp	$	386		$	461		$	917		$	1,133
MidAmerican Funding	278			284			444			517
NV Energy	307			393			540			683
Northern Powergrid	102			106			360			346
BHE Pipeline Group	105			66			388			328
BHE Transmission	82			86			244			236
BHE Renewables	176			157			308			256
HomeServices	85			79			185			191
BHE and Other⁽¹⁾	2			8			(20		)	(38		)
Total operating income	1,523			1,640			3,366			3,652
Interest expense	(453		)	(464		)	(1,380		)	(1,379		)
Capitalized interest	17			14			44			34
Allowance for equity funds	30			24			75			59
Interest and dividend income	27			32			85			85
Gains (losses) on marketable securities, net	260			3			(336		)	8
Other, net	19			(17		)	50			8
Total income before income tax expense and equity income	$	1,423		$	1,232		$	1,904		$	2,467



Interest expense:
PacifiCorp	$	96	$	95	$	288	$	285
MidAmerican Funding	61		59		185		177
NV Energy	52		57		169		173
Northern Powergrid	34		34		107		98
BHE Pipeline Group	11		11		31		33
BHE Transmission	42		45		127		125
BHE Renewables	49		51		150		153
HomeServices	6		1		16		3
BHE and Other⁽¹⁾	102		111		307		332
Total interest expense	$	453	$	464	$	1,380	$	1,379



	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Operating revenue by country:
United States	$	5,209	$	4,869	$	13,757	$	12,793
United Kingdom	232		221		754		685
Canada	174		182		531		506
Philippines and other	22		11		28		19
Total operating revenue by country	$	5,637	$	5,283	$	15,070	$	14,003



Income before income tax expense and equity income by country:
United States	$	1,290	$	1,113	$	1,501	$	2,065
United Kingdom	59		49		220		213
Canada	43		47		125		127
Philippines and other	31		23		58		62
Total income before income tax expense and equity income by country	$	1,423	$	1,232	$	1,904	$	2,467



	As of
	September 30,		December 31,
	2018		2017
Assets:
PacifiCorp	$	23,501	$	23,086
MidAmerican Funding	19,499		18,444
NV Energy	14,078		13,903
Northern Powergrid	7,527		7,565
BHE Pipeline Group	5,285		5,134
BHE Transmission	8,863		9,009
BHE Renewables	8,590		7,687
HomeServices	2,860		2,722
BHE and Other⁽¹⁾	1,659		2,658
Total assets	$	91,862	$	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 nine-month period ended September 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																	70		70
Foreign currency translation							(24		)			(41		)					(65		)
September 30, 2018	$	1,129	$	2,102	$	2,369	$	967		$	73	$	1,530		$	95	$	1,418	$	9,683

Schedule of Segment Reporting Information, by Segment

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	727		$	707		$	1,785		$	1,677
Regulated natural gas	103			103			505			485
Other	2			3			5			4
Total operating revenue	$	832		$	813		$	2,295		$	2,166

Operating income:
Regulated electric	$	278		$	287		$	392		$	475
Regulated natural gas	1			(3		)	52			41
Other	(1		)	—			—			—
Total operating income	278			284			444			516
Interest expense	(56		)	(54		)	(170		)	(160		)
Allowance for borrowed funds	6			4			14			9
Allowance for equity funds	16			11			39			25
Other, net	13			9			34			27
Income before income tax benefit	$	257		$	254		$	361		$	417



	As of
	September 30, 2018		December 31, 2017
Assets:
Regulated electric	$	16,066	$	14,914
Regulated natural gas	1,322		1,403
Other	—		1
Total assets	$	17,388	$	16,318

Schedule of Segment Reporting Information, by Segment

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



	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	727		$	707		$	1,785		$	1,677
Regulated natural gas	103			103			505			485
Other	2			5			7			8
Total operating revenue	$	832		$	815		$	2,297		$	2,170

Operating income:
Regulated electric	$	278		$	287		$	392		$	475
Regulated natural gas	1			(3		)	52			41
Other	(1		)	—			—			1
Total operating income	278			284			444			517
Interest expense	(61		)	(59		)	(185		)	(177		)
Allowance for borrowed funds	6			4			14			9
Allowance for equity funds	16			11			39			25
Other, net	12			10			35			28
Income before income tax benefit	$	251		$	250		$	347		$	402



	As of
	September 30, 2018		December 31, 2017
Assets⁽¹⁾:
Regulated electric	$	17,257	$	16,105
Regulated natural gas	1,401		1,482
Other	13		34
Total assets	$	18,671	$	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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Operating revenue:
Regulated electric	$	225		$	215		$	575		$	534
Regulated natural gas	14			15			74			66
Total operating revenue	$	239		$	230		$	649		$	600

Operating income:
Regulated electric	$	56		$	71		$	111		$	141
Regulated natural gas	—			3			11			15
Total operating income	56			74			122			156
Interest expense	(12		)	(11		)	(33		)	(33		)
Allowance for borrowed funds	—			1			1			1
Allowance for equity funds	1			1			3			2
Other, net	3			3			8			5
Income before income tax expense	$	48		$	68		$	101		$	131



	As of
	September 30,		December 31,
	2018		2017
Assets:
Regulated electric	$	3,131	$	3,103
Regulated natural gas	300		300
Regulated common assets⁽¹⁾	85		10
Total assets	$	3,516	$	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)	9 Months Ended
General (Details)	Sep. 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

XML 100 R64.htm IDEA: XBRL DOCUMENT

New Accounting Pronouncements New Accounting Pronouncements (Details) - BHE (Details) $ in Millions	9 Months Ended
	Sep. 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

XML 101 R65.htm IDEA: XBRL DOCUMENT

Business Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Business Acquisitions (Details) - USD ($) $ in Millions	Apr. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Acquisitions, net of cash acquired			$ (1,102)
Ownership Percentage Acquired			25.00%
Purchase of redeemable noncontrolling interest		$ 131	$ 0
Goodwill		9,683		$ 9,678
Other acquisitions [Member]
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ (105)	(1,100)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			476
Goodwill			$ 522
HomeServices [Member] \| Real estate brokerage franchise business [Member]
Business Acquisition [Line Items]
Ownership Percentage Acquired	33.30%
Purchase of redeemable noncontrolling interest	$ 131

XML 102 R66.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	$ 2,200		2,200		$ 2,526
Equity Method Investments [Abstract]
Equity method investments	2,030		2,030		1,834
Restricted Cash and Investments [Abstract]
Restricted cash and investments	928		928		863
Investments, including equity method investments and restricted cash and investments	5,158		5,158		5,223
Investments, including equity method investments and restricted cash and investments, current	404		404		351
Investments, including equity method investments and restricted cash and investments, noncurrent	4,754		4,754		4,872
Gain on Sale of Investments	260	$ 3	(336)	$ 8
Marketable Securities, Realized Gain (Loss)	0		1
Marketable Securities, Gain (Loss)	260		(337)
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	543		543		515
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	385		385		348
Equity Method Investments, tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	1,221		1,221		1,025
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	530		530		524
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	116		116		137
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	163		163		148
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	1,616		1,616		1,961
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	398		398		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

XML 103 R67.htm IDEA: XBRL DOCUMENT

Investments and Restricted Cash and Investments Equity Method Investments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prior Period Reclassification Adjustment	$ 26

XML 104 R68.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 63,863	$ 63,315
Construction in Progress, Gross	3,724	2,556
Property, plant and equipment, net	67,587	65,871
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	83,046	81,836
Accumulated depreciation and amortization	(25,566)	(24,478)
Property, plant and equipment in service, net	57,480	57,358
Construction in Progress, Gross	3,200	2,200
Regulated Operation [Member] \| Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 75,751	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	$ 7,295	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	$ 8,156	7,499
Accumulated depreciation and amortization	(1,773)	(1,542)
Property, plant and equipment in service, net	6,383	5,957
Unregulated Operation [Member] \| Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,551	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	$ 1,605	$ 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 105 R69.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 28,201	$ 27,880
Public utility accumulated depreciation and amortization	(9,750)	(9,366)
Public Utilities Property, Plant And Equipment In Service, Net	18,451	18,514
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	18,461	18,525
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	877	678
Public Utilities, Property, Plant and Equipment, Net	$ 19,338	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	$ 10	$ 11

XML 106 R70.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 13,739	$ 13,410
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,494	797
Property, plant and equipment, net	15,233	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	19,583	18,965
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,850)	(5,561)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	13,733	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
Unregulated Operation [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	20 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	50 years
Electric Operations [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	$ 12,500	12,107
Public Utilities, Property, Plant and Equipment, Transmission	1,870	1,838
Public Utilities, Property, Plant and Equipment, Distribution	$ 3,519	3,380
Electric Operations [Member] \| Regulated Operation [Member] \| Minimum [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
Electric Operations [Member] \| Regulated Operation [Member] \| Maximum [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
Natural Gas Processing Plant [Member] \| Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,694	$ 1,640
Natural Gas Processing Plant [Member] \| Regulated Operation [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	29 years
Natural Gas Processing Plant [Member] \| Regulated Operation [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	75 years

XML 107 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	Sep. 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	$ (11)	$ (10)

XML 108 R72.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC (Details) - Nevada Power Company [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 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	$ 6,734		$ 6,804
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	96		73
Property, plant and equipment, net	6,830		6,877
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	5
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,702		3,707
Public Utilities, Property, Plant and Equipment, Distribution	3,373		3,314
Public Utilities, Property, Plant and Equipment, Transmission	1,864		1,860
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	820		793
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,759		9,674
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,026		2,871
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,733		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 109 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	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,819	$ 2,760
Property, plant and equipment, net	2,938	2,892
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	119	132
Property, plant and equipment, net	2,938	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	1,518	1,459
Public Utilities, Property, Plant and Equipment, Transmission	817	786
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 191	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	$ 398	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	$ 305	294
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,387	4,268
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,573	1,513
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,814	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 110 R74.htm IDEA: XBRL DOCUMENT

Regulatory Matters - PAC (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
Regulatory Matters - PAC (Details) - USD ($) $ in Millions	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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				$ 112		$ 112
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		3.00%
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 23
Public Utilities Commission, Idaho [Member] \| PacifiCorp [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	2.00%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 6

XML 111 R75.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - NPC (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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] \| Wynn Las Vegas LLC [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Impact Fee Credit				$ 3,000,000
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 112 R76.htm IDEA: XBRL DOCUMENT

Regulatory Matters Regulatory Matters - SPPC (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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 113 R77.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016	$ 935
Restricted cash and cash equivalents	358	327
Restricted Cash and Cash Equivalents, Noncurrent	28	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,402	$ 1,283	$ 1,459	$ 1,003

XML 114 R78.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - MEC (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016,000,000	$ 935,000,000
Restricted cash and cash equivalents	358,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402,000,000	1,283,000,000	$ 1,459,000,000	$ 1,003,000,000
MidAmerican Energy Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	115,000,000	172,000,000
Restricted cash and cash equivalents	68,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 183,000,000	$ 282,000,000	$ 516,000,000	$ 26,000,000

XML 115 R79.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosures - LLC (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016,000,000	$ 935,000,000
Restricted cash and cash equivalents	358,000,000	327,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402,000,000	1,283,000,000	$ 1,459,000,000	$ 1,003,000,000
MidAmerican Funding, LLC and Subsidiaries [Domain]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	115,000,000	172,000,000
Restricted cash and cash equivalents	68,000,000	110,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 183,000,000	$ 282,000,000	$ 516,000,000	$ 27,000,000

XML 116 R80.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - Pacificorp (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016	$ 935
Restricted cash and cash equivalents	358	327
Restricted Cash and Cash Equivalents, Noncurrent	28	21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,283	$ 1,459	$ 1,003
PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	308	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	323	$ 29	$ 119	$ 33
Accounting Standards Update 2016-15 [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Prior Period Reclassification Adjustment	26
Accounting Standards Update 2016-15 [Member] \| PacifiCorp [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Prior Period Reclassification Adjustment	$ 26

XML 117 R81.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - NPC (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016	$ 935
Restricted cash and cash equivalents	358	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,283	$ 1,459	$ 1,003
Nevada Power Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	80	57
Restricted cash and cash equivalents	7	9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 87	$ 66	$ 77	$ 290

XML 118 R82.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure - SPPC (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,016	$ 935
Restricted cash and cash equivalents	358	327
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,283	$ 1,459	$ 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	$ 33	$ 60

XML 119 R83.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Aug. 31, 2018	Jul. 31, 2018	May 31, 2018	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018
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%
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%
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%
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%
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%
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%

XML 120 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 121 R85.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - PAC (Details) - 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 122 R86.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Sep. 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 123 R87.htm IDEA: XBRL DOCUMENT

Recent Financing Transactions Recent Financing Transactions - NPC (Details) - Nevada Power Company [Member] - USD ($) $ in Millions	Aug. 31, 2018	May 31, 2018	Apr. 30, 2018
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 124 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 125 R89.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [Line Items]
Federal statutory income tax rate	21.00%	35.00%		21.00%	35.00%	35.00%
Reclassification of long-term income tax receivable				$ (609)
Long-term income tax receivable [Member]
Income Tax Rate Change [Line Items]
Reclassification of long-term income tax receivable				(609)
Long-term income tax receivable adjustments				115
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Deferred Income Tax Expense (Benefit)				2
Deferred Tax Liabilities, Net	$ 61			61
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| Deferred Income Tax Charge [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability				59
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| Long-term income tax receivable [Member]
Income Tax Rate Change [Line Items]
Long-term income tax receivable adjustments				$ 115
Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate				21.00%
Increase (decrease) in provisional tax liabilities			$ 45
Deferred Income Tax Expense (Benefit)	37
Current Income Tax Expense (Benefit)	(37)
Increase (Decrease) in Deferred Income Taxes	14
Tax Cuts and Jobs Act of 2017 [Member] \| Deferred Income Tax Charge [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 14
IOWA \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| Maximum [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent				9.80%

XML 126 R90.htm IDEA: XBRL DOCUMENT

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	(19.00%)	(19.00%)	(29.00%)	(18.00%)
State income tax, net of federal income tax benefit	1.00%	(0.00%)	(6.00%)	(1.00%)
Income tax effect of foreign income	(0.00%)	(3.00%)	(3.00%)	(4.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(3.00%)	(0.00%)
Equity income	0.00%	1.00%	0.00%	1.00%
Other, net	1.00%	1.00%	1.00%	(0.00%)
Effective income tax rate	2.00%	15.00%	(19.00%)	13.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
Related Party Tax Expense [Abstract]
Long-term income tax receivable	$ (494)		$ (494)		$ 0
Parent Company [Member]
Related Party Tax Expense [Abstract]
Related party transaction, cash received for income taxes, net			450	$ 659
Long-term income tax receivable	$ 494		$ 494

XML 127 R91.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change - PAC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 37
Current Income Tax Expense (Benefit)	37
Increase (Decrease) in Deferred Income Taxes	$ 14
PacifiCorp [Member]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
PacifiCorp [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 21
Current Income Tax Expense (Benefit)	(21)
Increase (Decrease) in Deferred Income Taxes	8
Deferred Income Tax Charge [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	14
Deferred Income Tax Charge [Member] \| PacifiCorp [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 8

XML 128 R92.htm IDEA: XBRL DOCUMENT

Income Taxes - PAC (Details)	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes - PAC (Details)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	(1.00%)	0.00%	6.00%	1.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(19.00%)	(19.00%)	(29.00%)	(18.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(3.00%)	(0.00%)
Other, net	1.00%	1.00%	1.00%	(0.00%)
Effective income tax rate	(2.00%)	(15.00%)	19.00%	(13.00%)
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	(1.00%)	(2.00%)	(2.00%)	(2.00%)
Effective income tax rate	15.00%	32.00%	14.00%	32.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years

XML 129 R93.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
MidAmerican Energy Company [Member]
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 37
Tax Cuts and Jobs Act of 2017 [Member] \| MidAmerican Energy Company [Member]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	61		$ 61
Deferred Income Tax Expense (Benefit)			2
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| MidAmerican Energy Company [Member]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	54		54
Deferred Income Tax Expense (Benefit)			$ 2
Maximum [Member] \| IOWA \| Tax Year, Current [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent			12.00%
Maximum [Member] \| IOWA \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent			9.80%
Deferred Income Tax Charge [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 14
Deferred Income Tax Charge [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability			$ 59
Deferred Income Tax Charge [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| MidAmerican Energy Company [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability			$ 56

XML 130 R94.htm IDEA: XBRL DOCUMENT

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes - MEC (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	(19.00%)	(19.00%)	(29.00%)	(18.00%)
State income tax, net of federal income tax benefit	1.00%	(0.00%)	(6.00%)	(1.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(3.00%)	(0.00%)
Other, net	1.00%	1.00%	1.00%	(0.00%)
Effective income tax rate	(2.00%)	(15.00%)	19.00%	(13.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
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	(95.00%)	(74.00%)	(97.00%)	(74.00%)
State income tax, net of federal income tax benefit	(10.00%)	(10.00%)	(9.00%)	(7.00%)
Effects of ratemaking	(4.00%)	(2.00%)	(7.00%)	(4.00%)
Other, net	(0.00%)	(1.00%)	(1.00%)	(0.00%)
Effective income tax rate	(88.00%)	(52.00%)	(93.00%)	(50.00%)
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			$ 232	$ 381

XML 131 R95.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 37
Tax Cuts and Jobs Act of 2017 [Member] \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
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]
Income Tax Rate Change [Line Items]
Deferred Tax Liabilities, Net	54		54
Deferred Income Tax Expense (Benefit)			$ 2
IOWA \| Maximum [Member] \| Tax Year, Current [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent			12.00%
IOWA \| Maximum [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Statutory Income Tax Rate, State and Local, Percent			9.80%
Deferred Income Tax Charge [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 14
Deferred Income Tax Charge [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability			$ 59
Deferred Income Tax Charge [Member] \| Iowa Senate File 2417, Rate Effective Starting 2021 [Member] \| MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability			$ 56

XML 132 R96.htm IDEA: XBRL DOCUMENT

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	(19.00%)	(19.00%)	(29.00%)	(18.00%)
State income tax, net of federal income tax benefit	1.00%	(0.00%)	(6.00%)	(1.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(3.00%)	(0.00%)
Other, net	1.00%	1.00%	1.00%	(0.00%)
Effective income tax rate	(2.00%)	(15.00%)	19.00%	(13.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
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	(97.00%)	(76.00%)	(101.00%)	(76.00%)
State income tax, net of federal income tax benefit	(10.00%)	(10.00%)	(10.00%)	(8.00%)
Effects of ratemaking	(5.00%)	(2.00%)	(7.00%)	(4.00%)
Effective income tax rate	(91.00%)	(53.00%)	(97.00%)	(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			$ 248	$ 386

XML 133 R97.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change - NPC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 37
Current Income Tax Expense (Benefit)	37
Increase (Decrease) in Deferred Income Taxes	$ 14
Nevada Power Company [Member]
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Deferred Income Tax Expense (Benefit)	$ 12
Current Income Tax Expense (Benefit)	(12)
Increase (Decrease) in Deferred Income Taxes	5
Deferred Income Tax Charge [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	14
Deferred Income Tax Charge [Member] \| Nevada Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 5

XML 134 R98.htm IDEA: XBRL DOCUMENT

Income Taxes Income Taxes - NPC (Details)	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes Income Taxes - NPC (Details)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	2.00%	0.00%	3.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	(1.00%)	(1.00%)	0.00%
Effective income tax rate	(2.00%)	(15.00%)	19.00%	(13.00%)
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, Nondeductible Expense, Percent	3.00%	0.00%	3.00%	0.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	1.00%	0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	2.00%	0.00%	1.00%
Effective income tax rate	24.00%	37.00%	24.00%	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 135 R99.htm IDEA: XBRL DOCUMENT

Income Taxes Income Tax Rate Change - SPPC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Current Income Tax Expense (Benefit)	$ 37
Deferred Income Tax Expense (Benefit)	37
Increase (Decrease) in Deferred Income Taxes	$ 14
Sierra Pacific Power Company [Member]
Income Tax Rate Change [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]
Income Tax Rate Change [Line Items]
Federal statutory income tax rate			21.00%
Current Income Tax Expense (Benefit)	$ (4)
Deferred Income Tax Expense (Benefit)	4
Increase (Decrease) in Deferred Income Taxes	2
Deferred Income Tax Charge [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	14
Deferred Income Tax Charge [Member] \| Sierra Pacific Power Company [Member] \| Tax Cuts and Jobs Act of 2017 [Member]
Income Tax Rate Change [Line Items]
Increase in Regulatory Liability	$ 2

XML 136 R100.htm IDEA: XBRL DOCUMENT

Income Taxes Income Taxes - SPPC (Details)	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes Income Taxes - SPPC (Details)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	(2.00%)	(0.00%)	(3.00%)	(0.00%)
Effective income tax rate	(2.00%)	(15.00%)	19.00%	(13.00%)
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%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	5.00%	0.00%	4.00%	0.00%
Effects of ratemaking	(1.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	27.00%	35.00%	25.00%	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 137 R101.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 3	$ 6	$ 7
Interest cost	7	7	19	21
Expected return on plan assets	(9)	(9)	(31)	(30)
Net amortization	(3)	(3)	(9)	(10)
Net periodic benefit cost	(4)	(2)	(15)	(12)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	15	18
Interest cost	26	29	78	87
Expected return on plan assets	(41)	(40)	(123)	(120)
Net amortization	8	7	23	22
Net periodic benefit cost	(2)	2	(7)	7
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	15	19
Interest cost	14	15	42	44
Expected return on plan assets	(25)	(25)	(78)	(74)
Defined Benefit Plan, Plan Assets, Payment for Settlement	12	18	36	18
Net amortization	9	17	38	50
Net periodic benefit cost	15	$ 31	53	$ 57
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 16		$ 8

XML 138 R102.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - Employer Contributions (Details) - 9 months ended Sep. 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
Employer contributions	6
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	34
UNITED KINGDOM \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year \| £			£ 46
Employer contributions	$ 47	£ 35

XML 139 R103.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 3	$ 6	$ 7
Interest cost	7	7	19	21
Expected return on plan assets	(9)	(9)	(31)	(30)
Net amortization	(3)	(3)	(9)	(10)
Net periodic benefit cost	(4)	(2)	(15)	(12)
PacifiCorp [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1	2
Interest cost	3	3	9	10
Expected return on plan assets	(5)	(5)	(16)	(16)
Net amortization	(1)	(1)	(4)	(4)
Net periodic benefit cost	(3)	(2)	(10)	(8)
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	15	18
Interest cost	26	29	78	87
Expected return on plan assets	(41)	(40)	(123)	(120)
Net amortization	8	7	23	22
Net periodic benefit cost	(2)	2	(7)	7
Domestic Plan [Member] \| PacifiCorp [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	11	12	32	37
Expected return on plan assets	(18)	(18)	(54)	(54)
Net amortization	3	3	10	10
Net periodic benefit cost	(4)	(3)	(12)	(7)
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 16		$ 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		$ 6		$ 17

XML 140 R104.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 7
Employer contributions	6
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	34
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	$ 3

XML 141 R105.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Plan [Member] \| Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 6	$ 15	$ 18
Interest cost	26	29	78	87
Expected return on plan assets	(41)	(40)	(123)	(120)
Net amortization	8	7	23	22
Net periodic benefit cost	(2)	2	(7)	7
Pension Plan [Member] \| Domestic Plan [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	6	7
Interest cost	7	8	21	23
Expected return on plan assets	(11)	(11)	(33)	(33)
Net amortization	1	0	2	1
Net periodic benefit cost	(1)	(1)	(4)	(2)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	3	6	7
Interest cost	7	7	19	21
Expected return on plan assets	(9)	(9)	(31)	(30)
Net amortization	(3)	(3)	(9)	(10)
Net periodic benefit cost	(4)	(2)	(15)	(12)
Other Postretirement Benefits Plan [Member] \| MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	4	4
Interest cost	2	3	6	7
Expected return on plan assets	(3)	(3)	(10)	(10)
Net amortization	(1)	(1)	(3)	(3)
Net periodic benefit cost	(1)	$ 1	(3)	$ (2)
Accounting Standards Update 2017-07 [Member] \| Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	16		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	(4)		(15)
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	$ (4)		$ (14)

XML 142 R106.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 7
Employer contributions	6
MidAmerican Energy Company [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	0
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	39
Employer contributions	34
Domestic Plan [Member] \| MidAmerican Energy Company [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	$ 5

XML 143 R107.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - NPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 6
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	34
Nevada Power Company [Member] \| Domestic Plan [Member] \| Other Assets [Member] \| NV Energy, Inc. [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	1	$ 0
Nevada Power Company [Member] \| Domestic Plan [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	19
Liability, Defined Benefit Plan, Noncurrent	4	23
Nevada Power Company [Member] \| Domestic Plan [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	10	10
Nevada Power Company [Member] \| Domestic Plan [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1
Liability, Defined Benefit Plan, Noncurrent	0	1
Nevada Power Company [Member] \| Domestic Plan [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 144 R108.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans - SPPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 6
Domestic Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	34
Sierra Pacific Power Company [Member] \| Domestic Plan [Member] \| Other Noncurrent Liabilities [Member] \| NV Energy, Inc. [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	6
Liability, Defined Benefit Plan, Noncurrent	0	$ 2
Employer contributions	6
Sierra Pacific Power Company [Member] \| Domestic Plan [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] \| Domestic Plan [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	13	20
Employer contributions	6
Sierra Pacific Power Company [Member] \| Domestic Plan [Member] \| Other Assets [Member] \| NV Energy, Inc. [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan		0
Sierra Pacific Power Company [Member] \| Domestic Plan [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 145 R109.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (105)		$ (104)
Cash collateral, net receivable, offset against derivative positions	70		74
Derivative assets (liabilities), at fair value, net	(35)		(30)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	4		8
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	4		8
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		1
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	6		1
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(41)		(31)
Cash collateral, net receivable, offset against derivative positions	18		17
Derivative assets (liabilities), at fair value, net	(23)		(14)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(74)		(82)
Cash collateral, net receivable, offset against derivative positions	52		57
Derivative assets (liabilities), at fair value, net	(22)		(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	20		13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(125)		(117)
Derivative, fair value, net	(105)		(104)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	102	$ 116	101	$ 97	$ 95	$ 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	10		11
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(6)		(3)
Derivative, fair value, net	4		8
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	4		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(2)		0
Derivative, fair value, net	6		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	(47)		(32)
Derivative, fair value, net	(41)		(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	(74)		(82)
Derivative, fair value, net	$ (74)		$ (82)

XML 146 R110.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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 116	$ 95	$ 101	$ 73
Changes in fair value recognized in net regulatory assets	14	6	48	36
Net (losses) gains reclassified to operating revenue	(36)	(5)	(30)	8
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	8	1	(17)	(20)
Ending balance	$ 102	$ 97	$ 102	$ 97

XML 147 R111.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	Sep. 30, 2018 gal Dth MWh	Dec. 31, 2017 gal Dth MWh
Electricity sales
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| MWh	7	9
Natural gas purchases
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| Dth	115	113
Fuel oil purchases
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount \| gal	2	0

XML 148 R112.htm IDEA: XBRL DOCUMENT

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 108	$ 110
Collateral already posted, aggregate fair value	70	74
Additional collateral, aggregate fair value	$ 26	$ 34

XML 149 R113.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 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	$ (35)		$ (35)			$ (29)
Assets, fair value disclosure	3,715		3,715			3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	110		110			105
Derivative liabilities	(80)		(80)			(83)
Cash collateral, net receivable, offset against derivative positions	75		75			76
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,011		3,011			3,296
Derivative liabilities	(1)		(1)			(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	629		629			565
Derivative liabilities	(173)		(173)			(175)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	110		110			113
Derivative liabilities	(16)		(16)			(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	501		501			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	501		501			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	716		716			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	716		716			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	183		183			176
United States government obligations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	183		183			176
United States government obligations [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			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	47		47			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	47		47			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	300		300			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	300		300			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	1,622		1,622			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	1,622		1,622			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	(35)		(35)			(29)
Derivative assets	117		117			118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	110		110			105
Derivative liabilities	(74)		(74)			(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	(1)		(1)			(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	53		53			42
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(168)		(168)			(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	99		99			104
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(15)		(15)			(10)
Interest Rate Contract [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	36		36			24
Derivative liabilities	(6)		(6)			(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	3		3			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	22		22			15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(5)		(5)			(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	11		11			9
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(1)			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	84	$ 86	84	$ 86	$ 83	94	$ 81	$ 60
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	1	(7)	(3)	(19)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1)	1	(1)	3
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	(3)	3	11	5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1	0	2	1
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	3	(2)	5	(14)
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	10	13	10	13	$ 17	$ 9	$ 8	$ 6
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(54)	(34)	(140)	(100)
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	8	0	6
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	$ 61	$ 37	$ 139	$ 99

XML 150 R114.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 83	$ 81	$ 94	$ 60
Changes included in earnings	(1)	7	3	19
Changes in fair value recognized in other comprehensive income	1	(1)	1	(3)
Changes in fair value recognized in net regulatory assets	3	(3)	(11)	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1	0	2	1
Settlements	(3)	2	(5)	14
Ending balance	84	86	84	86
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	17	8	9	6
Changes included in earnings	54	34	140	100
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	8	0	6
Settlements	(61)	(37)	(139)	(99)
Ending balance	$ 10	$ 13	$ 10	$ 13

XML 151 R115.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 40,520	$ 40,522

XML 152 R116.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Sep. 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	$ (35)	$ (29)
Assets, fair value disclosure	3,715	3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset	110	105
Derivative Liability	(80)	(83)
Cash collateral, net receivable, offset against derivative positions	75	76
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,011	3,296
Derivative Liability	(1)	(3)
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	629	565
Derivative Liability	(173)	(175)
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	110	113
Derivative Liability	(16)	(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	(35)	(29)
Derivative assets	117	118
Derivative liability, fair value, gross asset and right to reclaim cash, offset	110	105
Derivative Liability	(74)	(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	(1)	(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	53	42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(168)	(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	99	104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(15)	(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	716	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	716	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
Debt Securities, Trading, and Equity Securities, FV-NI		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
Debt Securities, Trading, and Equity Securities, FV-NI		0
PacifiCorp [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	346	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	336	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	20	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	70	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	(10)	(4)
Derivative assets	10	9
Derivative liability, fair value, gross asset and right to reclaim cash, offset	80	78
Derivative Liability	(45)	(39)
Cash collateral, net receivable, offset against derivative positions	70	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	20	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(125)	(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	310	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	310	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]
Debt Securities, Trading, and Equity Securities, FV-NI	26	21
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	26	21
PacifiCorp [Member] \| Investment funds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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]
Debt Securities, Trading, and Equity Securities, FV-NI	$ 0	$ 0

XML 153 R117.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,520	40,522
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	7,014	7,005
PacifiCorp [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 7,862	$ 8,370

XML 154 R118.htm IDEA: XBRL DOCUMENT

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

Sep. 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

$ 75

$ 76

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

(35)

(29)

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

3,715

3,945

110

105

Money market mutual funds [Member]

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

United States government obligations [Member]

716

685

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

International government obligations [Member]

183

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]

300

288

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

Investment funds [Member]

1,622

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]

3,011

3,296

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

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

716

685

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

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

183

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]

300

288

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

Level 1 [Member] | Investment funds [Member]

1,622

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]

629

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]

Debt Securities, Trading, and Equity Securities, FV-NI

Level 3 [Member]

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

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

110

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]

Debt Securities, Trading, and Equity Securities, FV-NI

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

(35)

(29)

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

110

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

(1)

(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

(168)

(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

104

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

(15)

(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]

654

667

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

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

^[1]

133

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

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

183

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]

300

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]

Debt Securities, Trading, and Equity Securities, FV-NI

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]

598

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]

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]

183

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]

300

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]

Debt Securities, Trading, and Equity Securities, FV-NI

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]

Debt Securities, Trading, and Equity Securities, FV-NI

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]

Debt Securities, Trading, and Equity Securities, FV-NI

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]

(2)

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

(6)

(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 September 30, 2018 and December 31, 2017, respectively.

XML 155 R119.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC - Level 3 (Details) - Derivative [Member] - MidAmerican Energy Company [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (1)	$ (1)	$ 3	$ (2)
Changes in fair value recognized in net regulatory assets	(1)	(2)	(4)	(2)
Settlements	1	1	0	2
Ending balance	$ (1)	$ (2)	$ (1)	$ (2)

XML 156 R120.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,520	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	$ 5,612

XML 157 R121.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,520	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	$ 5,908

XML 158 R122.htm IDEA: XBRL DOCUMENT

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

Sep. 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]

$ 3,715

$ 3,945

Level 1 [Member]

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

3,011

3,296

Level 2 [Member]

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

629

565

Level 3 [Member]

Money market mutual funds [Member]

110

113

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

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

716

685

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

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

716

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

(1)

(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

(168)

(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

(15)

(10)

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

(8)

(3)

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

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

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

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

$ (8)

$ (3)

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

XML 159 R123.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (9)	$ (4)	$ (3)	$ (14)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	(2)	1	6	3
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	0	(1)	(2)	(13)
Ending balance	$ (7)	$ (4)	$ (7)	$ (4)

XML 160 R124.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,520	40,522
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,351	2,600
Nevada Power Company [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 2,653	$ 3,088

XML 161 R125.htm IDEA: XBRL DOCUMENT

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

Sep. 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]

$ 716

$ 685

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

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

716

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

(1)

(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

(168)

(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

(15)

(10)

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]

^[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]

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

(1)

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

$ (1)

[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 162 R126.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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	2	0	(1)	0
Settlements	(1)	0	0	0
Ending balance	$ (1)	$ 0	$ (1)	$ 0

XML 163 R127.htm IDEA: XBRL DOCUMENT

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,558	$ 35,193
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	40,520	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	$ 1,153	$ 1,221

XML 164 R128.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 422
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
Long-term Renewable Power Purchase Agreement [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	1,000
Capital Addition Purchase Commitments [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	563
Capital Addition Purchase Commitments [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	566
Public Utilities, Inventory, Fuel [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	273
Maintenance, service and other contracts [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 226

- Details

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

XML 165 R129.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - PAC - Commitments (Details) - PacifiCorp [Member] $ in Millions	Sep. 30, 2018 USD ($)
Long-term Renewable Power Purchase Agreement [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 1,000
Capital Addition Purchase Commitments [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	566
Public Utilities, Inventory, Fuel [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 273

XML 166 R130.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	9 Months Ended
	Sep. 30, 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 167 R131.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 30, 2018 USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 422
Capital Addition Purchase Commitments [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	563
Maintenance, service and other contracts [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 226

XML 168 R132.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] - Electric Transmission [Member] $ in Millions	9 Months Ended
	Sep. 30, 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 169 R133.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies Commitments and Contingencies - MEC - Retail Rates (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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 170 R134.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Dec. 31, 2017

Unbilled Contracts Receivable

$ 624

$ 665

Revenue from Contract with Customer, Excluding Assessed Tax

4,270

11,358

Non-contracts with customer revenue [Member]

5,637

$ 5,283

15,070

$ 14,003

Electricity and natural gas [Member]

149

460

4,419

4,322

11,818

11,501

Revenue from Contract with Customer, Excluding Assessed Tax

1,343

3,637

PacifiCorp [Member] | Non-contracts with customer revenue [Member]

1,369

1,430

3,746

3,956

MidAmerican Funding [Member]

109

Revenue from Contract with Customer, Excluding Assessed Tax

828

2,279

MidAmerican Funding [Member] | Non-contracts with customer revenue [Member]

832

815

2,297

2,170

NV Energy, Inc. [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,052

2,405

NV Energy, Inc. [Member] | Non-contracts with customer revenue [Member]

1,059

1,047

2,426

2,384

Northern Powergrid Holdings [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

206

692

Northern Powergrid Holdings [Member] | Non-contracts with customer revenue [Member]

233

221

757

685

BHE Pipeline Group [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

283

893

BHE Pipeline Group [Member] | Non-contracts with customer revenue [Member]

259

871

BHE Transmission [Member]

^[1]

(24)

(22)

Revenue from Contract with Customer, Excluding Assessed Tax

174

531

BHE Transmission [Member] | Non-contracts with customer revenue [Member]

174

182

531

506

BHE Renewables [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

235

538

BHE Renewables [Member] | Non-contracts with customer revenue [Member]

320

720

Berkshire Hathaway Energy And Other [Member]

182

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

149

383

Berkshire Hathaway Energy And Other [Member] | Non-contracts with customer revenue [Member]

173

^[2]

151

470

^[2]

453

Regulated Operation [Member]

^[2]

Revenue from Contract with Customer, Excluding Assessed Tax

3,844

10,297

Regulated Operation [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

2,971

7,303

Regulated Operation [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

500

Regulated Operation [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

306

Regulated Operation [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

439

1,385

Regulated Operation [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

258

802

Regulated Operation [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | PacifiCorp [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,343

3,637

Regulated Operation [Member] | PacifiCorp [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,323

3,534

Regulated Operation [Member] | PacifiCorp [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | PacifiCorp [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

(10)

^[3]

Regulated Operation [Member] | PacifiCorp [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | PacifiCorp [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | PacifiCorp [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | MidAmerican Funding [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

826

2,272

Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

647

1,538

Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

428

Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

262

Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | MidAmerican Funding [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | MidAmerican Funding [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | NV Energy, Inc. [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,052

2,404

Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,002

2,232

Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | NV Energy, Inc. [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | NV Energy, Inc. [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Northern Powergrid Holdings [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

196

661

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

196

661

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Northern Powergrid Holdings [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Pipeline Group [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

283

893

Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Pipeline Group [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

283

893

Regulated Operation [Member] | BHE Pipeline Group [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Transmission [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

171

525

Regulated Operation [Member] | BHE Transmission [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Transmission [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Transmission [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Transmission [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

171

525

Regulated Operation [Member] | BHE Transmission [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Transmission [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | BHE Renewables [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

(27)

(95)

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

(1)

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated retail gas [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

(1)

(3)

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Regulated interstate pipeline [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

(25)

(91)

Regulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

Unregulated Operation [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

426

1,061

Unregulated Operation [Member] | PacifiCorp [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | MidAmerican Funding [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | NV Energy, Inc. [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | Northern Powergrid Holdings [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | BHE Pipeline Group [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | BHE Transmission [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Unregulated Operation [Member] | BHE Renewables [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

235

538

Unregulated Operation [Member] | Berkshire Hathaway Energy And Other [Member] | Nonregulated products and services [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

176

478

Unbilled Contracts Receivable

229

$ 255

PacifiCorp [Member] | Non-contracts with customer revenue [Member]

1,369

$ 1,430

3,746

$ 3,956

PacifiCorp [Member] | Regulated Operation [Member]

109

Revenue from Contract with Customer, Excluding Assessed Tax

1,343

3,637

PacifiCorp [Member] | Regulated Operation [Member] | Regulated retail electric [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,307

3,479

PacifiCorp [Member] | Regulated Operation [Member] | Regulated wholesale [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

(10)

PacifiCorp [Member] | Regulated Operation [Member] | Regulated transmission and distribution [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

PacifiCorp [Member] | Regulated Operation [Member] | Other customer revenue [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

$ 16

$ 55

[1]	(3)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.
[2]	(1)The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations.
[3]	(2)Includes net payments to counterparties for the financial settlement of certain non-derivative forward contracts for energy sales at PacifiCorp.

XML 171 R135.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - Real Estate Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,270		$ 11,358
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	1,218	961	3,252	2,502
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
HomeServices [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	1,218	$ 961	3,252	$ 2,502
HomeServices [Member] \| Residential real estate brokerage [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,122		2,975
HomeServices [Member] \| Residential real estate brokerage and mortgage businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,140		3,027
Operating revenue	1,218		3,252
HomeServices [Member] \| Real estate franchise [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18		52
HomeServices [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	$ 78		$ 225

XML 172 R136.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,011
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	835
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| BHE Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	176
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	5,879
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 \| BHE Pipeline Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	5,879
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 \| BHE Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	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, Amount	6,890
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, Amount	6,714
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) \| BHE Transmission [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 176

XML 173 R137.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - PAC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,270		$ 11,358
Unbilled Contracts Receivable	624		624		$ 665
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,844		10,297
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971		7,303
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	80		306
Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	439		1,385
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		1
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Accounts Receivable	673		673		635
Unbilled Contracts Receivable	229		229		$ 255
Operating revenue	1,369	$ 1,430	3,746	$ 3,956
PacifiCorp [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	26		109
PacifiCorp [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,343		3,637
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,307		3,479
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	478		1,284
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	418		1,129
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	305		862
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	106		204
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(10)		21
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30		82
PacifiCorp [Member] \| Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 16		$ 55

XML 174 R138.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,270		$ 11,358
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Unbilled Contracts Receivable	624		624		$ 665
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,844		10,297
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971		7,303
Regulated Operation [Member] \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	96		500
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	80		306
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		1
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	828		2,277
Operating revenue	832	813	2,295	2,166
Unbilled Contracts Receivable	98		98		$ 89
MidAmerican Energy Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	4		18
MidAmerican Energy Company [Member] \| Regulated electric
Disaggregation of Revenue [Line Items]
Operating revenue	727	707	1,785	1,677
MidAmerican Energy Company [Member] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Operating revenue	103	103	505	485
MidAmerican Energy Company [Member] \| Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	2	$ 3	5	$ 4
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	730		1,967
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	287		854
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	117		351
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	271		621
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	8		27
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	47		114
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	82		262
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		43
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	723		1,769
Operating revenue	727		1,785
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	647		1,539
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	233		567
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	100		251
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	268		608
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	46		113
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	62		187
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Electricity Transmission [Member] \| Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		43
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	4		16
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	103		503
Operating revenue	103		505
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	83		428
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	54		287
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	17		100
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3		13
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member] \| Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8		27
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated retail gas [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20		75
MidAmerican Energy Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		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	2		5
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2		5
Operating revenue	2		5
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2		5
MidAmerican Energy Company [Member] \| Unregulated Operation [Member] \| Corporate and Other [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	$ 0		$ 0

XML 175 R139.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - LLC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,270	$ 11,358
Unregulated Operation [Member] \| Nonregulated products and services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	426	1,061
Corporate and Other [Member] \| 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	$ 0	$ 2

XML 176 R140.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - NPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 624		$ 624		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	4,270		11,358
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,844		10,297
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971		7,303
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	178		178		$ 111
Operating revenue	820	$ 819	1,777	$ 1,785
Nevada Power Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	6		17
Nevada Power Company [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	814		1,760
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	799		1,722
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15		38
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	790		1,698
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	484		989
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	135		340
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	164		351
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	7		18
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	$ 9		$ 24

XML 177 R141.htm IDEA: XBRL DOCUMENT

Revenue from Contracts with Customers Revenue from Contracts with Customers - SPPC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 624		$ 624		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	4,270		11,358
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,844		10,297
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971		7,303
Sierra Pacific Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	51		51		$ 62
Operating revenue	239	$ 230	649	$ 600
Sierra Pacific Power Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		4
Sierra Pacific Power Company [Member] \| Regulated electric
Disaggregation of Revenue [Line Items]
Operating revenue	225		575
Sierra Pacific Power Company [Member] \| Regulated electric \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		3
Sierra Pacific Power Company [Member] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Operating revenue	14		74
Sierra Pacific Power Company [Member] \| Regulated natural gas \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		1
Sierra Pacific Power Company [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	239		645
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13		36
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated electric
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	225		572
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated electric \| Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	12		35
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		73
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Regulated natural gas \| Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		1
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	225		606
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	85		251
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	78		208
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	60		142
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2		5
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated electric \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	212		534
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated electric \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	76		203
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated electric \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	75		190
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated electric \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59		136
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated electric \| Regulated retail electric [Member] \| Other [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] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13		72
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated natural gas \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9		48
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated natural gas \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3		18
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated natural gas \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		6
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled customer [Member] \| Regulated natural gas \| 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		3
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Distribution only service [Member] \| Regulated electric \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1		3
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Distribution only service [Member] \| Regulated natural gas
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	226		609
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled and distribution services only customer [Member] \| Regulated electric \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	213		537
Sierra Pacific Power Company [Member] \| Regulated Operation [Member] \| Fully bundled and distribution services only customer [Member] \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 13		$ 72

XML 178 R142.htm IDEA: XBRL DOCUMENT

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	$ (1)	$ 15	50	$ 16
Other comprehensive income (loss), foreign currency translation adjustment	(2)	227	(236)	535
Unrealized gains on marketable securities, net of tax	0	423	0	542
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	1	2	(5)
Other comprehensive income (loss)	(2)	666	(184)	1,088
Ending balance - Accumulated other comprehensive loss, net	(1,667)		(1,667)
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			50	16
Other comprehensive income (loss), foreign currency translation adjustment			(236)	535
Unrealized gains on marketable securities, net of tax			0	542
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			2	(5)
Other comprehensive income (loss)			(184)	1,088
Ending balance - unrecognized amounts on retirement benefits	(333)	(431)	(333)	(431)
Ending balance - foreign currency translation adjustment	(1,365)	(1,140)	(1,365)	(1,140)
Ending balance - unrealized gains (losses) on available-for-sale securities	0	1,127	0	1,127
Ending balance - unrealized gains (losses) on cash flow hedges	31	21	31	21
Ending balance - Accumulated other comprehensive loss, net	$ (1,667)	$ (423)	$ (1,667)	$ (423)

XML 179 R143.htm IDEA: XBRL DOCUMENT

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	$ 423	0	$ 542
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	1	2	(5)
Other comprehensive income (loss)	(2)	666	(184)	1,088
Ending balance - Accumulated other comprehensive loss, net	(1,667)		(1,667)
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	542
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			2	(5)
Other comprehensive income (loss)			(184)	1,088
Ending balance - unrealized gains (losses) on available-for-sale securities	0	1,127	0	1,127
Ending balance - unrealized gains (losses) on cash flow hedges	31	21	31	21
Ending balance - Accumulated other comprehensive loss, net	$ (1,667)	$ (423)	$ (1,667)	$ (423)

XML 180 R144.htm IDEA: XBRL DOCUMENT

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

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Dec. 31, 2017

$ 5,637

$ 5,283

$ 15,070

$ 14,003

Depreciation and amortization

(667)

(635)

(2,110)

(1,905)

681

651

2,147

1,943

1,523

1,640

3,366

3,652

453

464

1,380

1,379

Capitalized interest

Interest and dividend income

Gains (losses) on marketable securities, net

260

(336)

(17)

1,423

1,232

1,904

2,467

91,862

$ 90,208

1,369

1,430

3,746

3,956

(203)

(200)

(602)

(598)

386

461

917

1,133

288

285

MidAmerican Funding [Member]

23,501

23,086

832

815

2,297

2,170

(133)

(112)

(499)

(370)

278

284

444

517

185

177

19,499

18,444

NV Energy, Inc. [Member]

1,059

1,047

2,426

2,384

(114)

(105)

(341)

(315)

307

393

540

683

169

173

Northern Powergrid Holdings [Member]

14,078

13,903

233

221

757

685

(62)

(55)

(189)

(156)

102

106

360

346

107

BHE Pipeline Group [Member]

7,527

7,565

259

193

871

700

(27)

(42)

(99)

(115)

105

388

328

BHE Transmission [Member]

5,285

5,134

174

182

531

506

(61)

(58)

(184)

(165)

244

236

127

125

8,863

9,009

BHE Renewables [Member]

320

283

720

647

(68)

(63)

(198)

(187)

176

157

308

256

150

153

8,590

7,687

HomeServices [Member]

Depreciation and amortization

1,218

961

3,252

2,502

185

191

Berkshire Hathaway Energy And Other [Member]

2,860

2,722

173

^[1]

151

470

^[1]

453

(1)

(2)

(1)

(20)

(38)

102

111

307

332

1,659

$ 2,658

UNITED STATES

5,209

4,869

13,757

12,793

1,290

1,113

1,501

2,065

UNITED KINGDOM

232

221

754

685

220

213

CANADA

174

182

531

506

The Philippines and other [Member]

125

127

$ 31

$ 23

$ 58

$ 62

[1]	(1)The BHE and Other reportable segment represents amounts related principally to other entities, corporate functions and intersegment eliminations.

XML 181 R145.htm IDEA: XBRL DOCUMENT

Segment Information - Goodwill (Details) $ in Millions	9 Months Ended
Segment Information - Goodwill (Details) $ in Millions	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,678
Acquisitions	70
Foreign currency translation	(65)
Ending balance	9,683
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129
Acquisitions
Foreign currency translation
Ending balance	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102
Acquisitions
Foreign currency translation
Ending balance	2,102
NV Energy, Inc. [Member]
Goodwill [Roll Forward]
Beginning balance	2,369
Acquisitions
Foreign currency translation
Ending balance	2,369
Northern Powergrid Holdings [Member]
Goodwill [Roll Forward]
Beginning balance	991
Acquisitions
Foreign currency translation	(24)
Ending balance	967
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	73
Acquisitions
Foreign currency translation
Ending balance	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,571
Acquisitions
Foreign currency translation	(41)
Ending balance	1,530
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95
Acquisitions
Foreign currency translation
Ending balance	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	1,348
Acquisitions	70
Foreign currency translation
Ending balance	$ 1,418

XML 182 R146.htm IDEA: XBRL DOCUMENT

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| OperatingSegments			8
Operating revenue	$ 5,637	$ 5,283	$ 15,070	$ 14,003
Operating income	1,523	1,640	3,366	3,652
Interest expense	(453)	(464)	(1,380)	(1,379)
Capitalized interest	17	14	44	34
Allowance for equity funds	30	24	75	59
Other, net	19	(17)	50	8
Income before income tax (benefit) expense and equity income	1,423	1,232	1,904	2,467
Assets	91,862		$ 91,862		$ 90,208
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments \| ReportableSegments			2
Operating revenue	832	813	$ 2,295	2,166
Operating income	278	284	444	516
Interest expense	(56)	(54)	(170)	(160)
Capitalized interest	6	4	14	9
Allowance for equity funds	16	11	39	25
Other, net	13	9	34	27
Income before income tax (benefit) expense and equity income	257	254	361	417
Assets	17,388		17,388		16,318
MidAmerican Energy Company [Member] \| Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	727	707	1,785	1,677
Operating income	278	287	392	475
Assets	16,066		16,066		14,914
MidAmerican Energy Company [Member] \| Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	103	103	505	485
Operating income	1	(3)	52	41
Assets	1,322		1,322		1,403
MidAmerican Energy Company [Member] \| Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue	2	3	5	4
Operating income	(1)	$ 0	0	$ 0
Assets	$ 0		$ 0		$ 1

XML 183 R147.htm IDEA: XBRL DOCUMENT

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

3 Months Ended

9 Months Ended

Sep. 30, 2018

USD ($)

Sep. 30, 2017

USD ($)

Sep. 30, 2018

USD ($)

OperatingSegments

ReportableSegments

Sep. 30, 2017

USD ($)

Dec. 31, 2017

USD ($)

Number of reportable segments | OperatingSegments

$ 5,637

$ 5,283

$ 15,070

$ 14,003

1,523

1,640

3,366

3,652

(453)

(464)

(1,380)

(1,379)

Capitalized interest

Income before income tax (benefit) expense and equity income

(17)

1,423

1,232

1,904

2,467

91,862

$ 91,862

$ 90,208

Number of reportable segments | ReportableSegments

832

815

$ 2,297

2,170

278

284

444

517

(61)

(59)

(185)

(177)

Capitalized interest

Income before income tax (benefit) expense and equity income

251

250

347

402

MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated electric

^[1]

18,671

17,621

727

707

1,785

1,677

278

287

392

475

MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated natural gas

^[1]

17,257

16,105

103

505

485

(3)

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

^[1]

1,401

1,482

(1)

$ 0

$ 1

^[1]

$ 13

$ 34

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

XML 184 R148.htm IDEA: XBRL DOCUMENT

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

3 Months Ended

9 Months Ended

Sep. 30, 2018

USD ($)

Sep. 30, 2017

USD ($)

Sep. 30, 2018

USD ($)

OperatingSegments

TheNumberOfReportableSegments

Sep. 30, 2017

USD ($)

Dec. 31, 2017

USD ($)

Number of reportable segments | OperatingSegments

$ 5,637

$ 5,283

$ 15,070

$ 14,003

1,523

1,640

3,366

3,652

453

464

1,380

1,379

(17)

1,423

1,232

1,904

2,467

91,862

$ 91,862

$ 90,208

Number of reportable segments | TheNumberOfReportableSegments

239

230

$ 649

600

122

156

Allowance for Funds Used During Construction, Capitalized Interest

101

131

Sierra Pacific Power Company [Member] | Regulated electric

3,516

3,413

Regulated Operating Revenue

225

215

575

534

225

575

111

141

Sierra Pacific Power Company [Member] | Regulated natural gas

3,131

3,103

Regulated Operating Revenue, Gas

$ 3

$ 15

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

300