Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenue:
Energy	$ 15,171	$ 14,621	$ 15,354
Real estate	3,443	2,801	2,526
Total operating revenue	18,614	17,422	17,880
Energy:
Cost of sales	4,518	4,315	5,079
Operating expense	3,773	3,707	3,732
Depreciation and amortization	2,580	2,560	2,399
Real estate	3,229	2,589	2,342
Total operating costs and expenses	14,100	13,171	13,552
Operating income	4,514	4,251	4,328
Other income (expense):
Interest expense	(1,841)	(1,854)	(1,904)
Capitalized interest and allowance for borrowed funds	45	139	74
Allowance for equity funds	76	158	91
Other Interest and Dividend Income	111	120	107
Other, net	(398)	36	39
Total other income (expense)	(2,007)	(1,401)	(1,593)
Income before income tax (benefit) expense and equity (loss) income	2,507	2,850	2,735
Income tax (benefit) expense	(554)	403	450
Equity income (loss)	(151)	123	115
Net income	2,910	2,570	2,400
Net income attributable to noncontrolling interests	40	28	30
Net income (loss) attributable to parent	2,870	2,542	2,370
PacifiCorp [Member]
Operating revenue:
Electric Domestic Regulated Revenue	5,237	5,201	5,232
Energy:
Energy costs	1,770	1,751	1,868
Operations and maintenance	1,012	1,064	1,082
Utilities Operating Expense, Depreciation and Amortization	796	770	757
Taxes, other than income taxes	197	190	185
Total operating costs and expenses	3,775	3,775	3,892
Operating income	1,462	1,426	1,340
Other income (expense):
Interest expense	(381)	(380)	(379)
Capitalized interest and allowance for borrowed funds	11	15	18
Allowance for equity funds	20	27	33
Other, net	16	15	11
Total other income (expense)	(334)	(323)	(317)
Income before income tax (benefit) expense and equity (loss) income	1,128	1,103	1,023
Income tax (benefit) expense	360	340	328
Net income (loss) attributable to parent	768	763	695
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	2,108	1,985	1,837
Gas Domestic Regulated Revenue and Other	729	640	665
Total operating revenue	2,837	2,625	2,502
Energy:
Energy costs	434	409	433
Cost of natural gas purchases and other	442	367	398
Operations and maintenance	781	693	705
Utilities Operating Expense, Depreciation and Amortization	500	479	407
Taxes, other than income taxes	119	112	110
Total operating costs and expenses	2,276	2,060	2,053
Operating income	561	565	449
Other income (expense):
Interest expense	(214)	(196)	(183)
Capitalized interest and allowance for borrowed funds	15	8	8
Allowance for equity funds	41	19	20
Other, net	19	14	5
Total other income (expense)	(139)	(155)	(150)
Income before income tax (benefit) expense and equity (loss) income	422	410	299
Income tax (benefit) expense	(183)	(132)	(147)
Net income	605	542	446
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	22
Discontinued Operation, Tax Effect of Discontinued Operation	0	0	6
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	16
Net income (loss) attributable to parent	605	542	462
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	2,108	1,985	1,837
Gas Domestic Regulated Revenue and Other	738	646	678
Total operating revenue	2,846	2,631	2,515
Energy:
Energy costs	434	409	433
Cost of natural gas purchases and other	447	371	407
Operations and maintenance	784	694	707
Utilities Operating Expense, Depreciation and Amortization	500	479	407
Taxes, other than income taxes	119	112	110
Total operating costs and expenses	2,284	2,065	2,064
Operating income	562	566	451
Other income (expense):
Interest expense	(237)	(219)	(206)
Capitalized interest and allowance for borrowed funds	15	8	8
Allowance for equity funds	41	19	20
Other, net	(9)	19	19
Total other income (expense)	(190)	(173)	(159)
Income before income tax (benefit) expense and equity (loss) income	372	393	292
Income tax (benefit) expense	(202)	(139)	(150)
Net income	574	532	442
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	22
Discontinued Operation, Tax Effect of Discontinued Operation	0	0	6
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	16
Net income (loss) attributable to parent	574	532	458
Nevada Power Company [Member]
Operating revenue:
Total operating revenue	2,206	2,083	2,402
Energy:
Cost of sales	902	768	1,084
Operations and maintenance	393	394	372
Utilities Operating Expense, Depreciation and Amortization	308	303	297
Taxes, other than income taxes	40	38	36
Total operating costs and expenses	1,643	1,503	1,789
Operating income	563	580	613
Other income (expense):
Interest expense	(179)	(185)	(190)
Capitalized interest and allowance for borrowed funds	1	4	3
Allowance for equity funds	1	2	4
Other, net	25	24	20
Total other income (expense)	(152)	(155)	(163)
Income before income tax (benefit) expense and equity (loss) income	411	425	450
Income tax (benefit) expense	156	146	162
Net income (loss) attributable to parent	255	279	288
Sierra Pacific Power Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	713	702	810
Gas Domestic Regulated Revenue	99	110	137
Total operating revenue	812	812	947
Energy:
Cost of sales	268	265	374
Cost of Purchased Oil and Gas	42	55	84
Operations and maintenance	166	170	167
Utilities Operating Expense, Depreciation and Amortization	114	118	113
Taxes, other than income taxes	24	24	25
Total operating costs and expenses	614	632	763
Operating income	198	180	184
Other income (expense):
Interest expense	(43)	(54)	(61)
Capitalized interest and allowance for borrowed funds	2	4	2
Allowance for equity funds	3	(1)	2
Other, net	4	4	3
Total other income (expense)	(34)	(47)	(54)
Income before income tax (benefit) expense and equity (loss) income	164	133	130
Income tax (benefit) expense	55	49	47
Net income (loss) attributable to parent	$ 109	$ 84	$ 83