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Commitments and Contingencies - Future Minimum Lease Commitments Under Noncancellable Operating Leases (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 32
2020 25
2021 17
2022 9
2023 6
Thereafter 5
Total future lease commitments $ 94