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	69		69		0
Other comprehensive income (loss)	3			3	0
Balance at Mar. 31, 2011	3,773	1,679	2,092	(26)	28
Balance at Dec. 31, 2011	4,000	1,679	2,327	(34)	28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	71		71		0
Other comprehensive income (loss)	(14)			(14)	0
Balance at Mar. 31, 2012	$ 4,057	$ 1,679	$ 2,398	$ (48)	$ 28