Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 834
Other comprehensive income (loss) before reclassifications	21	$ (15)
Amounts reclassified from AOCI	8	0
Tax benefit	(7)	3
Other comprehensive income (loss)	22	(12)
Ending balance	1,073
Unrealized (loss) gain on sales hedging
AOCI Attributable to Parent, Net of Tax
Beginning balance	(9)	6
Other comprehensive income (loss) before reclassifications	21	(16)
Amounts reclassified from AOCI	6	(1)
Tax benefit	(5)	3
Other comprehensive income (loss)	22	(14)
Ending balance	13	(8)
Unrealized (loss)/ gain on forward interest rate swaps
AOCI Attributable to Parent, Net of Tax
Beginning balance	(9)	(15)
Other comprehensive income (loss) before reclassifications	7	1
Amounts reclassified from AOCI	2	1
Tax benefit	(2)	0
Other comprehensive income (loss)	7	2
Ending balance	(2)	(13)
Currency translation adjustments
AOCI Attributable to Parent, Net of Tax
Beginning balance	(34)	(36)
Other comprehensive income (loss) before reclassifications	(7)	0
Amounts reclassified from AOCI	0	0
Tax benefit	0	0
Other comprehensive income (loss)	(7)	0
Ending balance	(41)	(36)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance	(52)	(45)
Ending balance	$ (30)	$ (57)