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Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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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- Definition 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 -Clause 4 -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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624177-113959 Reference 4: 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. + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph 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. + Details
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- Definition 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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- Definition 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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