Other (Income) Expenses, Net - Schedule of Other (Income) Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income And Expenses [Abstract]
Equity (gain) loss	$ (30)	$ 14	$ (61)	$ 43
Foreign currency (gains) losses, net	(4)	(5)	2	8
Net (gain) loss from asset sales	(8)	2	(132)	(174)
Net loss on mark-to-market derivative instruments (M)	9	3	2	12
Non-service costs – Pension & OPEB (L)	13	28	37	80
Other	2	3	5	(5)
Other (Income) Expenses, Net	$ (18)	$ 45	$ (147)	$ (36)