Restructuring and Asset Related Charges - Net - 2016 Plan $ in Millions		3 Months Ended					9 Months Ended		12 Months Ended
	Jun. 27, 2016 employees	Sep. 30, 2017 USD ($) employees	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) employees	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) employees
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions		$ 139			$ 0		$ 126	$ 452
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		84	$ 115	$ 169			84		$ 228
Payments for Restructuring		31	51	59
Restructuring Reserve, Accrual Adjustment			(3)
Employee Severance [Member] | 2016 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions						268
Restructuring Reserve		60	91	142			60		201
Payments for Restructuring		$ 31	51	59			$ 141		$ 67
Restructuring Reserve, Accrual Adjustment			0
Restructuring And Related Cost, Number Of Remaining Positions To Be Eliminated | employees		630					630		1,700
Impairment of Long-Lived Assets and Other Assets [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		$ 24	24	27			$ 24		$ 27
Payments for Restructuring		$ 0	0	$ 0
Restructuring Reserve, Accrual Adjustment			$ (3)