Reportable Segments Net sales to external customers and long-lived assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,209	$ 3,273	$ 3,187	$ 3,254	$ 3,097	$ 3,254	$ 3,268	$ 3,395	$ 12,923	$ 13,014	$ 13,525
Property, net	3,716				3,569				3,716	3,569	3,621
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									8,196	8,438	8,560
Property, net	2,195				2,208				2,195	2,208	2,220
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									4,727	4,576	4,965
Property, net	$ 1,521				$ 1,361				$ 1,521	$ 1,361	$ 1,401