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Debt - Debt Maturities, Assuming the Exercise of all Extensions that are Exercisable Solely at our Option (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Debt Disclosure [Abstract]  
2019 $ 2
2020 20
2021 759
2022 97
2023 827
Thereafter(1) 2,413 [1]
Debt and capital lease obligations, gross $ 4,118
[1] Assumes the exercise of all extensions that are exercisable solely at our option.