Consolidated Statements of Operations (MEC) (MidAmerican Energy Company and Subsidiaries [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
MidAmerican Energy Company and Subsidiaries [Member]
Operating revenue:
Regulated electric	$ 1,694	$ 1,662	$ 1,779
Regulated gas	659	769	852
Nonregulated	889	1,070	1,179
Total operating revenue	3,242	3,501	3,810
Regulated operating costs and expenses:
Cost of fuel, energy and capacity	458	491	566
Cost of gas sold	424	519	602
Other operating expenses	427	413	421
Maintenance	220	197	204
Depreciation and amortization	392	336	344
Property and other taxes	115	115	112
Total regulated operating costs and expenses	2,036	2,071	2,249
Nonregulated operating costs and expenses:
Cost of sales	807	972	1,076
Other	29	29	26
Total nonregulated operating costs and expenses	836	1,001	1,102
Total operating costs and expenses	2,872	3,072	3,351
Operating income	370	429	459
Non-operating income:
Interest income	1	1	1
Allowance for equity funds	14	16	4
Other, net	9	7	(2)
Total non-operating income	24	24	3
Fixed charges:
Interest on long-term debt	142	157	155
Other interest expense	1	1	1
Allowance for borrowed funds	(5)	(7)	(2)
Total fixed charges	138	151	154
Income (loss) before income tax expense (benefit)	256	302	308
Income tax expense (benefit)	(99)	(17)	(49)
Net income	355	319	357
Preferred dividends	1	1	0
Earnings on common stock	$ 354	$ 318	$ 357