Other Income, Net - Schedule of Other Income, Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income And Expenses [Abstract]
Equity (gain) loss	$ (5)	$ 7
Foreign currency (gains) losses, net	(4)	11
Net gain from asset sales	(26)	(177)
Net (gain) loss on mark-to-market derivative instruments (M)	(5)	11
Non-service costs – Pension & OPEB (L)	13	25
Other	3	(9)
Other income , net	$ (24)	$ (132)