Restructuring and Cost Reduction Activities Restructuring and Cost Reduction Activities - Project K Program Costs Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 65	$ 5	$ 73	$ 25
Project K [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 15	$ 5	$ 23	$ 25