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Debt - Debt Maturities (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2020 $ 12 [1]
2021 750
2022 33
Thereafter 2,178
Debt and capital lease obligations, gross $ 2,973
[1] Assumes the exercise of all extensions that are exercisable solely at our option.