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Fair Value of Financial Instruments - Financial Assets and Liabilities Not Carried at Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value    
Financial liabilities:    
Debt $ 3,039 $ 3,740
Carrying Amount    
Financial liabilities:    
Debt $ 3,456 $ 3,466