Consolidated 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) [Member] USD ($)	MidAmerican Energy Company [Member] Preferred Securities [Member] USD ($)	MidAmerican Energy Company [Member] Noncontrolling Interest [Member] USD ($)
Balance at Dec. 31, 2010	$ 2,959	$ 562	$ 2,398	$ (29)	$ 27	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	319		319			0
Other comprehensive income (loss)	(5)			(5)		0
Preferred dividends	(1)		(1)
Balance at Dec. 31, 2011	3,272	562	2,716	(34)	27	1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	74
Balance at Mar. 31, 2012
Balance at Dec. 31, 2011	3,272	562	2,716	(34)	27	1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	355		355			0
Other comprehensive income (loss)	10			10		0
Preferred dividends	(1)		(1)
Disposition of subsidiary	(1)					(1)
Balance at Dec. 31, 2012	3,635		3,070	(24)		0
Balance at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60
Balance at Dec. 31, 2012	3,635
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	103
Balance at Mar. 31, 2013
Balance at Dec. 31, 2012	3,635	562	3,070	(24)	27	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	350		350			0
Other comprehensive income (loss)	13			13		0
Common dividends	(125)		(125)
Redemption of preferred securities	(28)	(1)			(27)
Balance at Dec. 31, 2013	3,845	561	3,295	(11)	0	0
Balance at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78
Balance at Dec. 31, 2013	$ 3,845