Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (28)	$ 38	$ (79)	$ 77
Other comprehensive income, net of tax (see Note 12)	5	3	8	6
Comprehensive income (loss)	$ (23)	$ 41	$ (71)	$ 83