Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating revenue:
Energy	$ 15,354	$ 15,182	$ 10,826
Real estate	2,526	2,144	1,809
Total operating revenue	17,880	17,326	12,635
Energy:
Cost of sales	5,079	5,732	3,799
Operating expense	3,732	3,501	2,794
Depreciation and amortization	2,399	2,028	1,527
Real estate	2,342	2,019	1,680
Total operating costs and expenses	13,552	13,280	9,800
Operating income	4,328	4,046	2,835
Other income (expense):
Interest expense	(1,904)	(1,711)	(1,222)
Capitalized interest	74	89	84
Allowance for equity funds	91	98	78
Other Interest and Dividend Income	107	38	15
Other, net	39	42	51
Total other income (expense)	(1,593)	(1,444)	(994)
Income before income tax expense and equity income (loss)	2,735	2,602	1,841
Income tax expense	450	589	130
Equity income (loss)	115	109	(35)
Net income	2,400	2,122	1,676
Net income attributable to noncontrolling interests	30	27	40
Net income (loss) attributable to parent	2,370	2,095	1,636
PacifiCorp [Member]
Operating revenue:
Electric Domestic Regulated Revenue	5,232	5,252	5,147
Energy:
Energy costs	1,868	1,997	1,924
Operations and maintenance	1,082	1,057	1,114
Utilities Operating Expense, Depreciation and Amortization	757	726	675
Taxes, other than income taxes	185	172	170
Total operating costs and expenses	3,892	3,952	3,883
Operating income	1,340	1,300	1,264
Other income (expense):
Interest expense	(379)	(379)	(379)
Allowance for Funds Used During Construction, Capitalized Interest	18	25	29
Allowance for equity funds	33	51	57
Other, net	11	10	8
Total other income (expense)	(317)	(293)	(285)
Income before income tax expense and equity income (loss)	1,023	1,007	979
Income tax expense	328	309	297
Net income (loss) attributable to parent	695	698	682
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	1,837	1,817	1,762
Gas Domestic Regulated Revenue	661	996	824
Other Revenue, Net	909	927	817
Total operating revenue	3,407	3,740	3,403
Energy:
Energy costs	433	532	517
Cost of Natural Gas Purchases	397	720	558
Operations and maintenance	687	699	659
Utilities Operating Expense, Depreciation and Amortization	407	351	403
Taxes, other than income taxes	124	123	119
Cost of Sales Nonregulated	855	863	764
Other Cost and Expense, Operating	33	30	27
Total operating costs and expenses	2,936	3,318	3,047
Operating income	471	422	356
Other income (expense):
Interest expense	(183)	(174)	(151)
Allowance for Funds Used During Construction, Capitalized Interest	8	16	7
Allowance for equity funds	20	39	19
Other, net	5	10	16
Total other income (expense)	(150)	(109)	(109)
Income before income tax expense and equity income (loss)	321	313	247
Income tax expense	(141)	(104)	(103)
Net income	462	417	350
Preferred Stock Dividends and Other Adjustments	0	0	1
Net Income (Loss) Available to Common Stockholders, Basic	462	417	349
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	1,837	1,817	1,762
Gas Domestic Regulated Revenue	661	996	824
Other Revenue, Net	922	949	827
Total operating revenue	3,420	3,762	3,413
Energy:
Energy costs	433	532	517
Cost of Natural Gas Purchases	397	720	558
Operations and maintenance	687	699	659
Utilities Operating Expense, Depreciation and Amortization	407	351	403
Taxes, other than income taxes	124	123	119
Cost of Sales Nonregulated	864	881	764
Other Cost and Expense, Operating	35	33	36
Total operating costs and expenses	2,947	3,339	3,056
Operating income	473	423	357
Other income (expense):
Interest expense	(206)	(197)	(174)
Allowance for Funds Used During Construction, Capitalized Interest	8	16	7
Allowance for equity funds	20	39	19
Other, net	19	18	22
Total other income (expense)	(159)	(124)	(126)
Income before income tax expense and equity income (loss)	314	299	231
Income tax expense	(144)	(110)	(110)
Net income	458	409	341
Net income attributable to noncontrolling interests	0	0	1
Net income (loss) attributable to parent	458	409	340
Nevada Power Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	2,402	2,337	2,092
Energy:
Cost of sales	1,084	1,076	835
Operations and maintenance	365	405	455
Utilities Operating Expense, Depreciation and Amortization	297	274	277
Taxes, other than income taxes	43	41	38
Business Combination, Acquisition Related Costs	0	0	52
Total operating costs and expenses	1,789	1,796	1,657
Operating income	613	541	435
Other income (expense):
Interest expense	(190)	(208)	(215)
Allowance for Funds Used During Construction, Capitalized Interest	3	1	6
Allowance for equity funds	4	1	8
Other, net	20	22	5
Total other income (expense)	(163)	(184)	(196)
Income before income tax expense and equity income (loss)	450	357	239
Income tax expense	162	130	94
Net income (loss) attributable to parent	288	227	145
Sierra Pacific Power Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	810	779	747
Gas Domestic Regulated Revenue	137	125	106
Total operating revenue	947	904	853
Energy:
Cost of sales	374	361	292
Cost of Purchased Oil and Gas	84	76	56
Operations and maintenance	163	158	197
Utilities Operating Expense, Depreciation and Amortization	113	105	123
Taxes, other than income taxes	29	26	25
Business Combination, Acquisition Related Costs	0	0	20
Total operating costs and expenses	763	726	713
Operating income	184	178	140
Other income (expense):
Interest expense	(61)	(61)	(61)
Allowance for Funds Used During Construction, Capitalized Interest	2	2	1
Allowance for equity funds	2	3	2
Other, net	3	12	6
Total other income (expense)	(54)	(44)	(52)
Income before income tax expense and equity income (loss)	130	134	88
Income tax expense	47	47	33
Net income (loss) attributable to parent	$ 83	$ 87	$ 55