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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 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 $ 54 $ 54 $ 53
Derivative Liabilities 341 341 $ 399
Fair value of the Company's foreign currency forward contracts 287 287  
Loss recognized on discontinuation of cash flow hedges 20    
Pre-tax losses recorded in accumulated other comprehensive income   276  
Fair Value, Inputs, Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Assets 54 54  
Derivative Liabilities $ 341 $ 341