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Debt - Debt Maturities (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2017 $ 55
2018 0
2019 0
2020 12 [1]
2021 750
Thereafter 2,209
Debt and capital lease obligations, gross $ 3,026
[1] Assumes the exercise of all extensions that are exercisable solely at our option.