Costs Associated with Rationalization Programs - Roll-Forward of the Rationalization Liability Between Periods (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance		$ 213
2018 Charges		47
Incurred, including net Foreign Currency Translation of $1 million and $0 million, respectively		(132)
Reversed to the Statements of Operations	$ (7)	(12)
Ending balance	116	116
Associate Severance and Other Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance		210
2018 Charges		36
Incurred, including net Foreign Currency Translation of $1 million and $0 million, respectively		(120)
Reversed to the Statements of Operations		(12)
Ending balance	114	114
Foreign currency translation gain (loss)		1
Other Exit and Non-Cancelable Lease Costs
Restructuring Reserve [Roll Forward]
Beginning balance		3
2018 Charges		11
Incurred, including net Foreign Currency Translation of $1 million and $0 million, respectively		(12)
Reversed to the Statements of Operations		0
Ending balance	$ 2	2
Foreign currency translation gain (loss)		$ 0