Restructuring and Cost Reduction Activities - Restructuring and Cost Reduction Reserves Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Liability, beginning balance			$ 104
Restructuring charges	$ 65	$ 5	73	$ 25
Cash payments			(69)
Non-cash charges and other			(4)
Liability, ending balance	104		104
Employee related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			93
Restructuring charges	45	1	42	5
Cash payments			(35)
Non-cash charges and other			0
Liability, ending balance	100		100
Pension curtailment (gain) loss, net
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	0	0	0	0
Cash payments			0
Non-cash charges and other			0
Liability, ending balance	0		0
Asset impairment
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	0	0	0	0
Cash payments			0
Non-cash charges and other			0
Liability, ending balance	0		0
Asset related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			1
Restructuring charges	7	(14)	10	(10)
Cash payments			(5)
Non-cash charges and other			(4)
Liability, ending balance	2		2
Other costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			10
Restructuring charges	13	18	21	30
Cash payments			(29)
Non-cash charges and other			0
Liability, ending balance	2		2
Project K [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 15	$ 5	$ 23	$ 25