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Stock Plans (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation Expense [Abstract]
Stock based compensation expense	$ 301	$ 287	$ 230
Stock Plans (Textuals) [Abstract]
Total income tax benefit recognized in the income statement for stock-based compensation arrangements	105	100	81
Restricted Stock Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock based compensation expense	176	163	135
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	259
Weighted-average remaining vesting period	1.6
Stock Option [Member]
Stock Based Compensation Expense [Abstract]
Stock based compensation expense	40	58	55
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	39
Weighted-average remaining vesting period	1.6
Liability Based Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock based compensation expense	83	64	38
Performance And Market Based Stock Options [Member]
Stock Based Compensation Expense [Abstract]
Stock based compensation expense	$ 2	$ 2	$ 2

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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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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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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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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-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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