Non-Operating Other, Net (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$ (13)	$ (10)	$ (4)
Corporate-owned life insurance income [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	(9)	(5)	(8)
Reduction of environmental contingencies [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	0	0	(5)
Gains on sales of assets and other investments [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	(2)	(2)	0
Impairment of assets [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	0	0	8
Other, net [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$ (2)	$ (3)	$ 1