Reportable Segments Net sales to external customers and long-lived assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,464	$ 3,429	$ 3,465	$ 3,412	$ 3,223	$ 3,372	$ 3,461	$ 3,522	$ 13,770	$ 13,578	$ 13,547
Property, net	3,713				3,612				3,713	3,612	3,731
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									7,821	7,885	8,176
Property, net	2,048				1,996				2,048	1,996	2,197
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,949	5,693	5,371
Property, net	$ 1,665				$ 1,616				$ 1,665	$ 1,616	$ 1,534