Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
AOCI Attributable to Parent, Net of Tax
Beginning Balance	$ 792
Other comprehensive (loss) income before reclassifications	(15)	$ (29)
Amounts reclassified from AOCI	0	7
Tax benefit (expense)	3	6
Other comprehensive (loss) income	(12)	(16)
Ending Balance	812
Unrealized (loss) gain on sales hedging
AOCI Attributable to Parent, Net of Tax
Beginning Balance	6	(1)
Other comprehensive (loss) income before reclassifications	(16)	(11)
Amounts reclassified from AOCI	(1)	6
Tax benefit (expense)	3	1
Other comprehensive (loss) income	(14)	(4)
Ending Balance	(8)	(5)
Unrealized (loss)/ gain on forward interest rate swaps
AOCI Attributable to Parent, Net of Tax
Beginning Balance	(15)	(15)
Other comprehensive (loss) income before reclassifications	1	(16)
Amounts reclassified from AOCI	1	1
Tax benefit (expense)	0	5
Other comprehensive (loss) income	2	(10)
Ending Balance	(13)	(25)
Currency translation adjustments
AOCI Attributable to Parent, Net of Tax
Beginning Balance	(36)	(32)
Other comprehensive (loss) income before reclassifications	0	(2)
Amounts reclassified from AOCI	0	0
Tax benefit (expense)	0	0
Other comprehensive (loss) income	0	(2)
Ending Balance	(36)	(34)
Total
AOCI Attributable to Parent, Net of Tax
Beginning Balance	(45)	(48)
Ending Balance	$ (57)	$ (64)