Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17	$ (45)	$ 25	$ (71)
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on anticipated sales hedging transactions	(8)	11	(14)	(4)
Unrealized (loss) gain on forward interest rate swaps hedging transactions	0	(3)	2	(10)
Foreign currency translation adjustment	0	(6)	0	(2)
Comprehensive income (loss)	$ 9	$ (43)	$ 13	$ (87)