CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 421	$ 17	$ (137)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on anticipated sales hedging transactions	21	(15)	7
Unrealized gain on forward interest rate swaps hedging transactions	9	6	0
Foreign currency translation adjustment	(13)	2	(4)
Comprehensive income (loss)	$ 438	$ 10	$ (134)