Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Fair Value Hedges and Not Designated as Hedges on Consolidated Statement of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives designated as fair value hedges
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income		$ (57)	$ (2)	$ (56)
Derivatives designated as fair value hedges | Foreign exchange contracts | Cost of revenue
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income		(58)		(58)
Derivatives designated as fair value hedges | Interest rate swaps | Interest expense
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income		1	(2)	2
Derivatives not designated as hedges
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income	31	(22)	8	10
Derivatives not designated as hedges | Foreign exchange contracts | Cost of revenue
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income	$ 31	$ (22)	$ 8	$ 10