Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (14)	$ 42	$ (93)	$ 119
Other comprehensive income, net of tax (see Note 13)	5	2	13	8
Comprehensive income (loss)	$ (9)	$ 44	$ (80)	$ 127