Leases - Schedule of Components of Lease Expense and Other Information Related to Leases (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating leases
Operating lease expense	[1]	$ 627	$ 451	$ 426
Finance leases:
Amortization of leased assets		415	348	299
Interest on lease liabilities		89	100	104
Total finance lease expense		504	448	403
Total lease expense		$ 1,131	$ 899	$ 829

[1] Includes short-term leases and variable lease costs, which are immaterial.