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Commitments And Contingencies (Future Minimum Lease Commitments Under Non-Cancellable Operating Leases) (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Disclosure Commitments And Contingencies Future Minimum Lease Commitments Under Non Cancellable Operating Leases [Abstract]  
Remaining 2017 $ 2
2018 9
2019 7
2020 6
2021 4
2022 0
Thereafter 1
Total $ 29