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Common and Preferred Shares and Warrants (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Authorized shares and a reconciliation of common shares issued and outstanding |  |  |
Common shares, authorized | 3,600,000,000 | 3,600,000,000 | 3,600,000,000
Shares issued and outstanding at beginning of year | 1,164,000,000 | 1,197,000,000 | 1,192,000,000
Repurchases of common shares | (69,000,000) | (48,000,000) | (14,000,000)
Other, primarily stock option exercises and RSAs granted | 10,000,000 | 15,000,000 | 19,000,000
Shares issued and outstanding as of December 31 | 1,105,000,000 | 1,164,000,000 | 1,197,000,000
Stockholders' Equity Note (Textuals) [Abstract] |  |  |
Shares reserved for issuance under employee stock and employee benefit plans | 80,000,000 |  |

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- Definition Common shares issued represents the total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). Common shares outstanding include the total number of shares of common stock held by shareholders. + References No definition available. + Details
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- Definition Represents the issuance of common shares during the period due to stock option exercises and restricted stock awards granted. + References No definition available. + Details
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- Definition Represents the issuance or (repurchases) of common shares during the period. + References No definition available. + Details
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- Details
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- Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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