Components of Accumulated Other Comprehensive Loss, Net (MEC) (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 Loss, Net [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified To Cost Of Sales Nonregulated	$ (10)	$ (38)	$ (18)
Accumulated Other Comprehensive Loss, Net [Roll Forward]
Other comprehensive income, Unrealized losses on available-for-sale securities	1	3	1
Other comprehensive income, Unrealized losses on cash flow hedges	12	7	(6)
Other comprehensive income (loss)	13	10	(5)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Loss, Net [Roll Forward]
Balance, December 31, 2012, Unrealized losses on available-for-sale securities	(5)
Balance, December 31, 2012, Unrealized losses on cash flow hedges	(19)
Balance December 31, 2012, Accumulated other comprehensive loss, net	(24)
Other comprehensive income, Unrealized losses on available-for-sale securities	1
Other comprehensive income, Unrealized losses on cash flow hedges	12
Other comprehensive income (loss)	13	10	(5)
Balance, December 31, 2013, Unrealized losses on available-for-sale securities	(4)	(5)
Balance, December 31, 2013, Unrealized losses on cash flow hedges	(7)	(19)
Balance December 31, 2013, Accumulated other comprehensive loss, net	$ (11)	$ (24)