Consolidated Statements of Operations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Regulated electric	$ 1,662	$ 1,779	$ 1,715
Regulated gas	769	852	857
Nonregulated	1,072	1,184	1,127
Total operating revenue	3,503	3,815	3,699
Regulated operating costs and expenses:
Cost of fuel, energy and capacity	491	566	522
Cost of gas sold	519	602	611
Other operating expenses	413	421	417
Maintenance	197	204	183
Depreciation and amortization	336	344	335
Property and other taxes	115	112	105
Total regulated operating costs and expenses	2,071	2,249	2,173
Nonregulated operating costs and expenses:
Cost of sales	972	1,076	1,026
Other	32	30	31
Total nonregulated operating costs and expenses	1,004	1,106	1,057
Total operating costs and expenses	3,075	3,355	3,230
Operating income	428	460	469
Non-operating income:
Interest income	1	1	0
Allowance for equity funds	16	4	0
Other, net	10	4	12
Total non-operating income	27	9	12
Fixed charges:
Interest on long-term debt	181	191	193
Other interest expense	2	1	4
Allowance for borrowed funds	(7)	(2)	(1)
Total fixed charges	176	190	196
Income before income tax benefit	279	279	285
Income tax benefit	(26)	(61)	(43)
Net income	305	340	328
Net income attributable to noncontrolling interests	1	0	1
Net income attributable to MidAmerican Funding	$ 304	$ 340	$ 327