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Debt - Outstanding Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 91  
2020 57  
2021 68  
2022 70  
2023 523  
2024 and thereafter 138  
Total debt not subject to compromise $ 947 $ 996