Risk Management and Hedging Activities (MEC) Not Designated As Hedging Contracts (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 45	$ 73	$ 27
Changes in fair value recognized in net regulatory assets	5	14	76
Net (losses) gains reclassified to operating revenue	(1)	21	0
Net (losses) gains reclassified to cost of fuel, energy and capacity	(1)	2	8
Net losses reclassified to cost of gas sold	(38)	(65)	(38)
Ending balance	$ 10	$ 45	$ 73