Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
Dec. 31, 2011 Y
Stock options outstanding additional information
Stock options outstanding, shares	75,823,941
Stock options outstanding, weighted average remaining contractual Life (Years)	5.2
Weighted average exercisable price, outstanding	$ 27.60
Stock options exercisable, shares	57,039,334
Stock options exercisable, weighted average exercisable price	$ 29.14
Exercise prices range $11.02-$15.00 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 11.02
Upper range limit of Exercise Prices	$ 15.00
Stock options outstanding, shares	10,225,221
Stock options outstanding, weighted average remaining contractual Life (Years)	7.1
Weighted average exercisable price, outstanding	$ 11.42
Stock options exercisable, shares	4,141,927
Stock options exercisable, weighted average exercisable price	$ 11.43
Exercise prices range $15.01-$20.00 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 15.01
Upper range limit of Exercise Prices	$ 20.00
Stock options outstanding, shares	212,080
Stock options outstanding, weighted average remaining contractual Life (Years)	4.4
Weighted average exercisable price, outstanding	$ 19.28
Stock options exercisable, shares	182,151
Stock options exercisable, weighted average exercisable price	$ 19.5
Exercise prices range $20.01-$25.00 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 20.01
Upper range limit of Exercise Prices	$ 25.00
Stock options outstanding, shares	10,530,634
Stock options outstanding, weighted average remaining contractual Life (Years)	4.3
Weighted average exercisable price, outstanding	$ 22.68
Stock options exercisable, shares	6,814,608
Stock options exercisable, weighted average exercisable price	$ 22.05
Exercise prices range $25.01-$30.00 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 25.01
Upper range limit of Exercise Prices	$ 30.00
Stock options outstanding, shares	17,848,881
Stock options outstanding, weighted average remaining contractual Life (Years)	4.8
Weighted average exercisable price, outstanding	$ 29.12
Stock options exercisable, shares	13,566,583
Stock options exercisable, weighted average exercisable price	$ 29.32
Exercise prices range $30.01-$35.00 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 30.01
Upper range limit of Exercise Prices	$ 35.00
Stock options outstanding, shares	27,400,486
Stock options outstanding, weighted average remaining contractual Life (Years)	5.2
Weighted average exercisable price, outstanding	$ 31.65
Stock options exercisable, shares	22,727,835
Stock options exercisable, weighted average exercisable price	$ 31.55
Exercise prices range $35.01-$36.25 [Member]
Stock options outstanding additional information
Lower range limit of Exercise Prices	$ 35.01
Upper range limit of Exercise Prices	$ 36.25
Stock options outstanding, shares	9,606,639
Stock options outstanding, weighted average remaining contractual Life (Years)	5.0
Weighted average exercisable price, outstanding	$ 36.07
Stock options exercisable, shares	9,606,230
Stock options exercisable, weighted average exercisable price	$ 36.07

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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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-Name Accounting Standards Codification

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-Section 50

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 718

-SubTopic 10

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-Paragraph 2

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(i)-(ii)

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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