Derivative Financial Instruments (Details 2) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (b)	$ (1)	$ 9
Foreign exchange contracts [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative	0	(2)
Foreign exchange contracts [Member] | Other income (expense), net [Member] | Not Designated as Hedging Instrument [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative (a)	(15)	22
Foreign exchange contracts [Member] | Cost of revenue [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative		0
Foreign exchange contracts [Member] | Revenue [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative		(2)
Foreign exchange contracts [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative (a)	87	(116)
Other income (expense), net [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (b)	(2)	8
Cost of revenue [Member] | Firm commitments [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative		0
Cost of revenue [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	9	(16)
Revenue [Member] | Firm commitments [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative		2
Revenue [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	21	6
Firm commitments [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative	0	2
Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	30	(10)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (b)	(2)	8
Amount of Gain (Loss) Recognized in Income on Derivative (a)	87	(116)
Not Designated as Hedging Instrument [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in Income on Derivative (a)	$ (15)	$ 22