Leases - Future Minimum Lease Commitments for Leases with Initial or Remaining Terms of One Year or More (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Operating
Operating lease, 2021	$ 101
Operating lease, 2022	81
Operating lease, 2023	64
Operating lease, 2024	55
Operating lease, 2025	44
Operating lease, Thereafter	245
Total lease payments	590
Less: Interest	(132)
Present value of lease liabilities	$ 458
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesMember
Finance
Finance leases, 2021	$ 36
Finance leases, 2022	30
Finance leases, 2023	23
Finance leases, 2024	19
Finance leases, 2025	18
Finance leases, Thereafter	228
Total lease payments	354
Less: Interest	(90)
Present value of lease liabilities	$ 264