Restructuring Charges/Other - Restructuring Reserve (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring And Related Activities [Abstract]
Balance, December 31, 2016	$ 40
Restructuring charges	8
Payments	(16)
Non-cash items	0	[1]
Balance, September 30, 2017	$ 32

[1] Reflects charges for impacts of accelerated depreciation and changes in exchange rates.