Consolidated Statements of Comprehensive Income (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income	$ 155	$ 100
Other comprehensive income (loss), net of tax:
Unrealized gains on available-for-sale securities, net of tax of $1 and $1	1	0
Unrealized gains on cash flow hedges, net of tax of $10 and $12	14	18
Total other comprehensive income, net of tax	15	18
Comprehensive income	170	118
Comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to MidAmerican Funding member	$ 170	$ 118