Other Expense, Net - (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Non-service cost components of pension and OPEB costs	$ (3)	$ (2)
Government grants and incentives	2	2
Foreign exchange loss	(2)	(2)
Strategic transaction expenses, net of transaction breakup fee income	1	(11)
Other, net	2	2
Other expense, net		$ (11)