CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17	$ (137)	$ (158)
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on anticipated sales hedging transactions	(15)	7	(6)
Unrealized gain (loss) on forward interest rate swaps hedging transactions	6	0	(7)
Foreign currency translation adjustment	2	(4)	(26)
Comprehensive income (loss)	$ 10	$ (134)	$ (197)