Risk Management and Hedging Activities (MEC) Designated As Hedging Contracts (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Net losses reclassified to nonregulated cost of sales	$ (10)	$ (38)	$ (18)
Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	32	43	34
Changes in fair value recognized in other comprehensive income	(11)	27	27
Net losses reclassified to nonregulated cost of sales	(10)	(38)	(18)
Ending balance	11	32	43
Cash flow hedge ineffectiveness	insignificant
Cash flow hedge gain (loss) to be reclassified within twelve months	$ 4