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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]      
Minimum derivative financial instrument's term (months)   2 months  
Maximum derivative financial instrument's term (months)   24 months  
Derivative Assets $ 39 $ 39 $ 53
Derivative Liabilities 335 335 $ 399
Fair value of the Company's foreign currency forward contracts 296 296  
Loss recognized on discontinuation of cash flow hedges 5 25  
Pre-tax losses recorded in accumulated other comprehensive income   299  
Fair Value, Inputs, Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Assets 39 39  
Derivative Liabilities $ 335 $ 335