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Debt and Commitments - Schedule of Future Principal Repayments on Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
2014 $ 230  
2015 39  
2016 22  
2017 15  
2018 18  
Thereafter 8  
Total long-term debt $ 332 $ 361