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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Derivatives, Fair Value [Line Items]          
Maximum Derivative Financial Instrument's Term (months)       2 months 24 months
Derivative Assets $ 36 $ 59 $ 36    
Derivative Liabilities 186 40 186    
Fair value of the Company's foreign currency forward contracts $ 150