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Debt - Debt Maturities, Assuming the Exercise of all Extensions that are Exercisable Solely at our Option (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Debt Disclosure [Abstract]  
2020 $ 13
2021 751
2022 32
2023 728
Thereafter(1) 1,434 [1]
Debt and capital lease obligations, gross $ 2,958
[1] Assumes the exercise of all extensions that are exercisable solely at our option.