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Commitments and Contingencies - Future Minimum Lease Commitments Under Capital Leases and Noncancellable Operating Leases with Initial or Remaining Terms of One Year or More (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Capital Lease Payments, 2019 $ 15
Capital Lease Payments, 2020 15
Capital Lease Payments, 2021 15
Capital Lease Payments, 2022 15
Capital Lease Payments, 2023 15
Capital Lease Payments, Thereafter 262
Total Capital Lease Payments 337
Operating Lease Payments, 2019 126
Operating Lease Payments, 2020 106
Operating Lease Payments, 2021 88
Operating Lease Payments, 2022 68
Operating Lease Payments, 2023 51
Operating Lease Payments, Thereafter 293
Total Operating Lease Payments $ 732