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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Cash Flow Hedging [Member]
Jun. 30, 2013
Cash Flow Hedging [Member]
Jun. 30, 2014
Foreign exchange contracts [Member]
Jun. 30, 2013
Foreign exchange contracts [Member]
Jun. 30, 2014
Foreign exchange contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2013
Foreign exchange contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2014
Foreign exchange contracts [Member]
Other income (expense), net [Member]
Jun. 30, 2013
Foreign exchange contracts [Member]
Other income (expense), net [Member]
Jun. 30, 2014
Foreign exchange contracts [Member]
Revenue [Member]
Jun. 30, 2013
Foreign exchange contracts [Member]
Revenue [Member]
Jun. 30, 2014
Foreign exchange contracts [Member]
Cost of revenue [Member]
Jun. 30, 2013
Foreign exchange contracts [Member]
Cost of revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]                            
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)     $ 13 $ (95)     $ 13 $ (95)            
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)         22 3         21 4 1 (1)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 19 $ 5     $ 19 $ 5     $ 19 $ 5