Consolidated Statements of Comprehensive Income (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income	$ 71	$ 69
Other comprehensive income (loss), net of tax:
Unrealized gains on available-for-sale securities, net of tax of $1 and $-	0	1
Unrealized (losses) gains on cash flow hedges, net of tax of $(11) and $1	(14)	2
Total other comprehensive (loss) income, net of tax	(14)	3
Comprehensive income	57	72
Comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to MidAmerican Funding	$ 57	$ 72