Other (Income) Expenses, Net - Schedule of Other (Income) Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income And Expenses [Abstract]
Equity (gain) loss	$ (26)	$ 22	$ (31)	$ 29
Foreign currency losses, net	10	2	6	13
Net (gain) loss from asset sales	(98)	1	(124)	(176)
Net (gain) loss on mark-to-market derivative instruments (M)	(2)	(2)	(7)	9
Non-service costs – Pension & OPEB (L)	11	27	24	52
Other		1	3	(8)
Other (Income) Expenses, Net	$ (105)	$ 51	$ (129)	$ (81)