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	100		100		0
Other comprehensive income (loss)	18			18	0
Balance at Mar. 31, 2013	4,469	1,679	2,769	(6)	27
Balance at Dec. 31, 2013	4,677	1,679	3,009	(11)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	155		155
Other comprehensive income (loss)	15			15
Balance at Mar. 31, 2014	$ 4,847	$ 1,679	$ 3,164	$ 4	$ 0