Non-Operating Other, Net (MEC) (Details) (MidAmerican Energy Company and Subsidiaries [Member], 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	$ (9)	$ (7)	$ 2
Corporate-owned life insurance income [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	(9)	(5)	(8)
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	$ 0	$ 2