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Long-Term Debt - Aggregate Maturities of Debt (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
2015 $ 46  
2016 1,235  
2017 481  
2018 26  
2019 1,459  
Thereafter 9  
Total debt $ 3,256 $ 3,573