Restructuring and Cost Reduction Activities - Restructuring and Cost Reduction Reserves Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Restructuring Reserve [Roll Forward]
Liability, beginning balance			$ 131
Restructuring charges	$ 1	$ 40	239	$ 164
Cash payments			(275)
Restructuring Reserve, Accrual Adjustment			99
Liability, ending balance	194		194
Employee related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			102
Restructuring charges	31	6	166	26
Cash payments			(146)
Restructuring Reserve, Accrual Adjustment			3
Liability, ending balance	125		125
Pension curtailment (gain) loss, net
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	(134)	0	(133)	0
Cash payments			0
Restructuring Reserve, Accrual Adjustment			133
Liability, ending balance	0		0
Asset impairment
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	0	0	0	16
Cash payments			0
Restructuring Reserve, Accrual Adjustment			0
Liability, ending balance	0		0
Asset related costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			0
Restructuring charges	38	5	68	32
Cash payments			(31)
Restructuring Reserve, Accrual Adjustment			(37)
Liability, ending balance	0		0
Other costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance			29
Restructuring charges	66	$ 29	138	$ 90
Cash payments			(98)
Restructuring Reserve, Accrual Adjustment			0
Liability, ending balance	$ 69		$ 69