Other Expense, Net - Schedule (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Non-service related net periodic benefit cost	$ 29	$ 28
Interest income	(10)	(6)
Foreign currency gains, net	0	(3)
Net loss from asset sales	2	3
Other, net	11	(2)
Total	$ 32	$ 20