Leases - Schedule of Maturities of Non-Cancelable Operating Lease Liabilities (Detail) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019	$ 20
2020	27
2021	28
2022	27
2023	21
Thereafter	204
Total minimum rent payments	327
Less: imputed interest	123
Operating lease liability	$ 204