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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, 2012
Dec. 31, 2011
2013 $ 249  
2014 24  
2015 31  
2016 16  
2017 16  
Thereafter 25  
Total long-term debt $ 361 $ 197