Consolidated Statements of Member's Equity (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Member's Equity
Beginning Balance	$ 818	$ 809
Net Income	119	106
Contributions		13
Distributions	(156)	(121)
Other Comprehensive Income	1
Ending Balance	$ 782	$ 807