Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance	$ 22	$ 26
Charges to restructuring	7	8
Cash payments	(5)	(10)
Currency impact	(1)	(1)
Ending balance	23	23
Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	17	21
Charges to restructuring	6	6
Cash payments	(3)	(7)
Currency impact	(1)	(1)
Ending balance	19	19
Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	5	5
Charges to restructuring	1	2
Cash payments	(2)	(3)
Currency impact
Ending balance	$ 4	$ 4