Consolidated Statements of Operations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Regulated electric	$ 1,694	$ 1,662	$ 1,779
Regulated gas	659	769	852
Nonregulated	894	1,072	1,184
Total operating revenue	3,247	3,503	3,815
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	35	32	30
Total nonregulated operating costs and expenses	842	1,004	1,106
Total operating costs and expenses	2,878	3,075	3,355
Operating income	369	428	460
Non-operating income:
Interest income	1	1	1
Allowance for equity funds	14	16	4
Other, net	13	10	4
Total non-operating income	28	27	9
Fixed charges:
Interest on long-term debt	164	181	191
Other interest expense	3	2	1
Allowance for borrowed funds	(5)	(7)	(2)
Total fixed charges	162	176	190
Income (loss) before income tax expense (benefit)	235	279	279
Income tax expense (benefit)	(108)	(26)	(61)
Net income	343	305	340
Net income attributable to noncontrolling interests	1	1	0
Net income attributable to MidAmerican Funding	$ 342	$ 304	$ 340