Consolidated Statements of Changes in Equity (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	MidAmerican Funding, LLC and Subsidiaries [Domain] USD ($)	MidAmerican Funding, LLC and Subsidiaries [Domain] Paid-in Capital [Member] USD ($)	MidAmerican Funding, LLC and Subsidiaries [Domain] Retained Earnings [Member] USD ($)	MidAmerican Funding, LLC and Subsidiaries [Domain] Accumulated Other Comprehensive Income (Loss), Net [Member] USD ($)	MidAmerican Funding, LLC and Subsidiaries [Domain] Noncontrolling Interests [Member] USD ($)
Balance at Dec. 31, 2012	$ 4,351	$ 1,679	$ 2,669	$ (24)	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122		121		1
Other comprehensive income (loss)	4			4	0
Redemption of preferred securities of subsidiary	(28)				(28)
Balance at Jun. 30, 2013	4,449	1,679	2,790	(20)	0
Balance at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22
Other comprehensive income (loss)	(14)
Balance at Jun. 30, 2013	4,449	1,679
Balance at Dec. 31, 2013	4,677	1,679	3,009	(11)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	185		185
Other comprehensive income (loss)	24			24
Other equity transactions	(1)		(1)
Balance at Jun. 30, 2014	4,885	1,679	3,193	13	0
Balance at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30
Other comprehensive income (loss)	9
Balance at Jun. 30, 2014	$ 4,885	$ 1,679			$ 0