Restructuring and Cost Reduction Activities Restructuring and Cost Reduction Activities - Project K Program Costs Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 18	$ 34	$ 91	$ 59
Project K [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 15	$ 34	$ 38	$ 59