Restructuring and Asset Related Charges - Net - 2016 Plan (Details) $ in Millions		3 Months Ended
	Jun. 27, 2016 employees	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions		$ 165	$ (1)
2016 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | employees	2,500
Restructuring, Settlement and Impairment Provisions				$ 449
Restructuring Reserve		51			$ 68
Restructuring Reserve, Accrual Adjustment		(1)
Payments for Restructuring		(16)
Employee Severance [Member] | 2016 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions				268
Restructuring Reserve		37			51
Restructuring Reserve, Accrual Adjustment		0
Payments for Restructuring		(14)
Asset write-downs and write-offs [Member] | 2016 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions				153
Costs Associated with Exit and Disposal Activities [Member] | 2016 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions				$ 28
Restructuring Reserve		14			$ 17
Restructuring Reserve, Accrual Adjustment		(1)
Payments for Restructuring		$ (2)