Condensed Statements Of Consolidated Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 57	$ (385)	$ (686)	$ (1,298)
Other comprehensive income, net of tax effects – cash flow hedges derivative value net loss related to hedged transactions recognized during the period and reported in interest expense and related charges (net of tax benefit of $1, $1, $3 and $3)	1	1	5	5
Comprehensive income (loss)	$ 58	$ (384)	$ (681)	$ (1,293)