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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 4 $ 36
Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives (97) (61)
Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) (243) (340)
Foreign Exchange Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (243) (17)
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (29) 35
Foreign Exchange Contracts [Member] | Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) (243) (340)
Foreign Exchange Contracts [Member] | Other Income (Expense), Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) 4 36
Foreign Exchange Contracts [Member] | Other Income (Expense), Net [Member] | Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives (97) (61)
Foreign Exchange Contracts [Member] | Cost of Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (262) (43)
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (33) (1)
Foreign Exchange Contracts [Member] | Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 19 $ 26