Leases - Schedule of Maturities of Non-Cancelable Operating Lease Liabilities (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019	$ 8
2020	32
2021	32
2022	32
2023	26
Thereafter	414
Total minimum rent payments	544
Less: imputed interest	260
Total operating lease liabilities	$ 284