Other Expenses, Net - Schedule of Other Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income And Expenses [Abstract]
Equity loss	$ 12	$ 2
Foreign currency losses, net	12	3
Net gain from asset sales	(8)	(5)
Net gain on mark-to-market derivative instruments		(17)
Non-service costs – Pension & OPEB	29	38
Other	(4)
Other expenses, net	$ 41	$ 21