Costs Associated with Rationalization Programs - Roll-Forward of the Rationalization Liability Between Periods (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Beginning balance			$ 213
2018 Charges			53
Incurred, including net Foreign Currency Translation of $2 million and $0 million, respectively			(153)
Reversed to the Statements of Operations	$ (1)	$ (5)	(13)	$ (7)
Ending balance	100		100
Associate Severance and Other Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance			210
2018 Charges			39
Incurred, including net Foreign Currency Translation of $2 million and $0 million, respectively			(137)
Reversed to the Statements of Operations			(13)
Ending balance	99		99
Foreign currency translation gain (loss)			2
Other Exit and Non-Cancelable Lease Costs
Restructuring Reserve [Roll Forward]
Beginning balance			3
2018 Charges			14
Incurred, including net Foreign Currency Translation of $2 million and $0 million, respectively			(16)
Reversed to the Statements of Operations			0
Ending balance	$ 1		1
Foreign currency translation gain (loss)			$ 0