Reportable Segments Net sales to external customers and long-lived assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,223	$ 3,372	$ 3,461	$ 3,522	$ 3,317	$ 3,469	$ 3,360	$ 3,401	$ 13,578	$ 13,547	$ 12,854
Property, net	3,612				3,731				3,612	3,731	3,716
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									7,885	8,176	8,160
Property, net	1,996				2,197				1,996	2,197	2,195
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,693	5,371	4,694
Property, net	$ 1,616				$ 1,534				$ 1,616	$ 1,534	$ 1,521