Unaudited Quarterly Operating Results (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unaudited Quarterly Operating Results [Line Items]
Operating revenue	$ 905	$ 828	$ 759	$ 921	$ 836	$ 828	$ 709	$ 874	$ 3,413	$ 3,247	$ 3,503
Operating income	78	130	43	106	58	139	81	91	357	369	428
Net income	76	143	22	100	58	136	78	71	341	343	305
Net income attributable to MidAmerican Funding	76	143	21	100	58	136	77	71	340	342	304
Income tax benefits from tax method change							$ 16