Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Beginning balance	$ 32	$ 38
Charges to restructuring	2	14
Cash payments	(4)	(23)
Currency impact	1	2
Ending balance	31	31
Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	26	32
Charges to restructuring	1	9
Cash payments	(3)	(18)
Currency impact	1	2
Ending balance	25	25
Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	6	6
Charges to restructuring	1	5
Cash payments	(1)	(5)
Currency impact
Ending balance	$ 6	$ 6