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Debt - Principal Payments of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 $ 2  
2017 506  
2018 898  
2019 5  
2020 5  
Thereafter 2,514  
Total debt $ 3,930 $ 3,166