Restructuring and Cost Reduction Activities - Restructuring and Cost Reduction Reserves Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Restructuring Reserve [Roll Forward]
Liability, beginning balance	$ 160
Restructuring charges	20	$ 142
Cash payments	(82)
Restructuring Reserve, Accrual Adjustment	(4)
Liability, ending balance	94
Employee related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	97
Restructuring charges	4	107
Cash payments	(28)
Restructuring Reserve, Accrual Adjustment	0
Liability, ending balance	73
Pension curtailment (gain) loss, net
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0
Restructuring charges	0	4
Cash payments	0
Restructuring Reserve, Accrual Adjustment	0
Liability, ending balance	0
Asset impairment
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0
Restructuring charges	0	0
Cash payments	0
Restructuring Reserve, Accrual Adjustment	0
Liability, ending balance	0
Asset related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0
Restructuring charges	4	10
Cash payments	0
Restructuring Reserve, Accrual Adjustment	(4)
Liability, ending balance	0
Other costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	63
Restructuring charges	12	$ 21
Cash payments	(54)
Restructuring Reserve, Accrual Adjustment	0
Liability, ending balance	$ 21