Restructuring and Cost Reduction Activities - Restructuring and Cost Reduction Reserves Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Restructuring Reserve [Roll Forward]
Liability, beginning balance			$ 104
Restructuring charges	$ 18	$ 34	91	$ 59
Cash payments			(103)
Non-cash charges and other			(8)
Liability, ending balance	84		84
Employee related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			93
Restructuring charges	(1)	17	41	22
Cash payments			(58)
Non-cash charges and other			0
Liability, ending balance	76		76
Pension curtailment (gain) loss, net
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	0	(30)	0	(30)
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	14	0	14
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	5	10	15	0
Cash payments			(7)
Non-cash charges and other			(8)
Liability, ending balance	1		1
Other costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			10
Restructuring charges	14	23	35	53
Cash payments			(38)
Non-cash charges and other			0
Liability, ending balance	7		7
Project K [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 15	$ 34	$ 38	$ 59