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 Loss, Net [Member] USD ($)	MidAmerican Funding, LLC and Subsidiaries [Domain] Noncontrolling Interests [Member] USD ($)
Balance at Dec. 31, 2010	$ 3,701	$ 1,679	$ 2,023	$ (29)	$ 28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	114		113		1
Other comprehensive income (loss)	13			13	0
Distributions to noncontrolling interests	(1)				(1)
Balance at Jun. 30, 2011	3,827	1,679	2,136	(16)	28
Balance at Mar. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45
Other comprehensive income (loss)	10
Balance at Jun. 30, 2011	3,827	1,679
Balance at Dec. 31, 2011	4,000	1,679	2,327	(34)	28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	149		148		1
Other comprehensive income (loss)	(7)			(7)	0
Distributions to noncontrolling interests	(1)				(1)
Balance at Jun. 30, 2012	4,141	1,679	2,475	(41)	28
Balance at Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78
Other comprehensive income (loss)	7
Balance at Jun. 30, 2012	$ 4,141	$ 1,679