Stock-Based Compensation (Details Textual) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012 Plans	Sep. 30, 2011	Dec. 31, 2011
Stock Based Compensation (Textual) [Abstract]
Number of employee stock ownership plans	2
Common shares issued from exercise of stock option outstanding	7.2	3.6	4.4

Number of share options (or share units) exercised during the current period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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

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

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration