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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 6 $ 33
Derivative Liabilities 36 $ 11
Fair value of the Company's foreign currency forward contracts 30  
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 6  
Derivative Liabilities $ 36