Debt - Components of Notes Payable (Details) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 30, 2017
Short-term Debt [Line Items]
Principal amount		$ 324	$ 370
U.S. commercial paper
Short-term Debt [Line Items]
Principal amount		$ 197	$ 196
Effective interest rate		2.26%	1.76%
Europe commercial paper
Short-term Debt [Line Items]
Principal amount		$ 0	$ 96
Effective interest rate	[1]	0.00%	(0.32%)
Bank borrowings
Short-term Debt [Line Items]
Principal amount		$ 127	$ 78

[1] Negative effective interest rates on certain borrowings in Europe are the result of efforts by the European Central Bank to stimulate the economy in the eurozone.