Retirement Plans - Adoption of ASU 2017-17 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Non-service components of pension and post-retirement income, net	$ (76)	$ (29)	$ (39)
Accounting Standards Update 2017-07
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Non-service components of pension and post-retirement income, net		(29)	(39)
Cost of sales and Selling and administrative expense		$ 29	$ 39