Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	11.10%	21.10%
Anticipated decrease in unrecognized tax benefits over the next 12 months	$ 6
Accrued potential interest included within current and non-current income taxes payable	15		$ 15
Accrued potential interest included within current and non-current income taxes payable, after income taxes	12		11
Potential penalties	$ 8		$ 8