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Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 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)	$ 18	$ 12
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)	48	(12)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (b)	17	9
Amount of Gain (Loss) Recognized in OCI on Derivative	(43)	(25)
Not Designated as Hedging Instrument [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in OCI on Derivative	(39)	8
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)	17	9
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)	40	(22)
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	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)	8	10
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] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on the Consolidated Statement of Income
Amount of Gain (Loss) Recognized in OCI on Derivative	(43)	(25)
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 OCI on Derivative	(39)	8
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	$ 0	$ (2)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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