Leases - Maturities of Operating and Finance Lease Liabilities (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Finance Leases
2019	$ 2
2020	7
2021	7
2022	7
2023	6
Thereafter	83
Total minimum lease payments	112
Less: imputed interest	(59)
Present value of lease liabilities	53
Operating Leases
2019	30
2020	104
2021	88
2022	74
2023	62
Thereafter	308
Total minimum lease payments	666
Less: imputed interest	(74)
Present value of lease liabilities	$ 592