Consolidated Statements of Comprehensive Income (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income	$ 341	$ 343	$ 305
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities, net of tax of $1, $2 and $-	1	3	1
Unrealized gains (losses) on cash flow hedges, net of tax of $9, $4 and $(3)	12	7	(6)
Total other comprehensive income (loss), net of tax	13	10	(5)
Comprehensive income	354	353	300
Comprehensive income attributable to noncontrolling interests	1	1	1
Comprehensive income attributable to MidAmerican Funding	$ 353	$ 352	$ 299