Statements of Changes in Equity (MEC) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	MidAmerican Energy Company [Member] USD ($)	MidAmerican Energy Company [Member] Common Stock [Member] USD ($)	MidAmerican Energy Company [Member] Retained Earnings [Member] USD ($)	MidAmerican Energy Company [Member] Accumulated Other Comprehensive Income (Loss), Net [Member] USD ($)	MidAmerican Energy Company [Member] Preferred Securities [Member] USD ($)
Balance at Dec. 31, 2012	$ 3,635	$ 562	$ 3,070	$ (24)	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127		127
Other comprehensive income (loss)	4			4
Redemption of preferred securities	(28)	(1)			(27)
Common dividends	(125)		(125)
Balance at Jun. 30, 2013	3,613	561	3,072	(20)	0
Balance at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24
Other comprehensive income (loss)	(14)
Balance at Jun. 30, 2013	3,613
Balance at Dec. 31, 2013	3,845	561	3,295	(11)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	189		189
Other comprehensive income (loss)	24			24
Balance at Jun. 30, 2014	4,058	561	3,484	13	0
Balance at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32
Other comprehensive income (loss)	9
Balance at Jun. 30, 2014	$ 4,058	$ 561			$ 0