Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 4
Restructuring Reserve [Roll Forward]
Beginning balance	$ 26		$ 38
Charges to restructuring	10		12
Cash payments	(5)		(19)
Currency impact	1		1
Ending Balance	32		32
Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	20		32
Charges to restructuring	8		8
Cash payments	(3)		(15)
Currency impact	1		1
Ending Balance	26		26
Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	6		6
Charges to restructuring	2		4
Cash payments	(2)		(4)
Currency impact
Ending Balance	$ 6		$ 6