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Shareholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of stock option activity
Outstanding shares, beginning balance	35,296,895	37,943,832	39,431,433
Stock option plans, Lower price range, Beginning Outstanding options	$ 16.73	$ 16.73	$ 16.73
Stock option plans, Upper price range, Beginning Outstanding options	$ 39.00	$ 39.00	$ 39.00
Outstanding, Weighted Average Price Per Share	$ 27.17	$ 27.33	$ 27.35
Options forfeited, shares	(8,843,743)	(2,646,937)	(1,487,601)
Options forfeited, Lower Range, Price Per Share	$ 17.08	$ 17.08	$ 17.08
Options forfeited, Upper Range, Price Per Share	$ 39.00	$ 39.00	$ 39.00
Options forfeited, Weighted Average Price Per Share	$ 35.11	$ 29.55	$ 27.69
Outstanding shares, ending balance	26,453,152	35,296,895	37,943,832
Stock option plans, Lower price range, Ending Outstanding options	$ 16.73	$ 16.73	$ 16.73
Stock option plans, Upper price range, Ending Outstanding options	$ 33.70	$ 39.00	$ 39.00
Outstanding, Weighted Average Price Per Share	$ 24.51	$ 27.17	$ 27.33

X

- Definition

Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit.

+ References

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Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit.

+ References

No definition available.

+ Details

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- Definition

Stock option plans, options forfeited, lower range, price per share.

+ References

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Stock option plans, options forfeited, upper range, price per share.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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)(f)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

+ 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)(f)

-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

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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)

-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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