Leases - Supplemental Cash Flow Information related to Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash outflows from operating leases	$ 616	$ 456	$ 396
Operating cash outflows from finance leases (interest payments)	89	100	104
Financing cash outflows from finance leases	439	338	321
Leased assets obtained in exchange for finance lease liabilities	486	188	616
Leased assets obtained in exchange for operating lease liabilities	$ 818	$ 553	$ 202