Consolidated Statements of Operations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Regulated electric	$ 415	$ 380
Regulated gas	315	263
Nonregulated	191	231
Total operating revenue	921	874
Regulated operating costs and expenses:
Cost of fuel, energy and capacity	123	108
Cost of gas sold	224	186
Other operating expenses	106	102
Maintenance	45	46
Depreciation and amortization	107	93
Property and other taxes	30	29
Total regulated operating costs and expenses	635	564
Nonregulated operating costs and expenses:
Cost of sales	174	212
Other	6	7
Total nonregulated operating costs and expenses	180	219
Total operating costs and expenses	815	783
Operating income	106	91
Non-operating income:
Allowance for equity funds	4	2
Other, net	6	5
Total non-operating income	10	7
Fixed charges:
Interest on long-term debt	41	42
Other interest expense	0	1
Allowance for borrowed funds	(1)	(1)
Total fixed charges	40	42
Income before income tax (benefit) expense	76	56
Income tax (benefit) expense	(24)	(15)
Net income	100	71
Net income attributable to noncontrolling interests	0	0
Net income attributable to MidAmerican Funding member	$ 100	$ 71