Restructuring and Cost Reduction Activities - Restructuring and Cost Reduction Reserves Rollforward (Details) - Project K [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Restructuring Reserve [Roll Forward]
Liability, beginning balance	$ 104
Restructuring charges	8	$ 20
Cash payments	(37)
Non-cash charges and other	(1)
Liability, ending balance	74
Employee related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	93
Restructuring charges	(3)	4
Cash payments	(19)
Non-cash charges and other	0
Liability, ending balance	71
Pension curtailment (gain) loss, net
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0
Restructuring charges	0	0
Cash payments	0
Non-cash charges and other	0
Liability, ending balance	0
Asset impairment
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0
Restructuring charges	0	0
Cash payments	0
Non-cash charges and other	0
Liability, ending balance	0
Asset related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	1
Restructuring charges	3	4
Cash payments	(3)
Non-cash charges and other	(1)
Liability, ending balance	0
Other costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	10
Restructuring charges	8	$ 12
Cash payments	(15)
Non-cash charges and other	0
Liability, ending balance	$ 3