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Leases - Maturities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases
Operating lease cost	$ 140	$ 132	$ 129
Finance lease cost	51	$ 48
Operating
2021	59
2022	71
2023	64
2024	55
2025	42
Thereafter	362
Total lease payments	653
Less: interest	(137)
Discounted lease liabilities	516
Financing
2021	61
2022	52
2023	47
2024	43
2025	39
Thereafter	234
Total lease payments	476
Less: interest	(112)
Discounted lease liabilities	$ 364

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