Reportable Segments Net sales to external customers and long-lived assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,317	$ 3,469	$ 3,360	$ 3,401	$ 3,185	$ 3,246	$ 3,175	$ 3,248	$ 13,547	$ 12,854	$ 12,965
Property, net	3,731				3,716				3,731	3,716	3,569
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									8,176	8,160	8,413
Property, net	2,197				2,195				2,197	2,195	2,208
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,371	4,694	4,552
Property, net	$ 1,534				$ 1,521				$ 1,534	$ 1,521	$ 1,361