CONDENSED 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
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 54	$ (53)	$ (149)	$ (135)
Net impact of interest rate derivative instruments, net of tax	2	5	7	16
Comprehensive income (loss)	$ 56	$ (48)	$ (142)	$ (119)