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Common and Preferred Shares and Warrants (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 25, 2013
Common And Preferred Shares And Warrants (Textuals) [Abstract] |  |  |  |
Common share repurchases authorized |  |  |  | 150,000,000
Common shares repurchased | 55,000,000 | 69,000,000 |  |
Cost basis of common stock repurchased | $ 3,943 | $ 3,952 | $ 2,300 |
Commissions paid included in cost basis of common stock repurchased | 1.1 | 1.0 |  |
Common shares remaining under share repurchase authorizations | 108,000,000 |  |  |
Shares held as treasury shares | 3,500,000 | 3,900,000 | 4,200,000 |
Cost basis of treasury stock | $ 260 | $ 236 | $ 217 |
Preferred shares, authorized | 20,000,000 |  |  |
Preferred shares, par value | 1.66 |  |  |
Preferred stock, shares issued | 0 | 0 | 0 |
Preferred stock, shares outstanding | 0 | 0 | 0 |

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- Definition Represents the amount of shares authorized by an entity's Board of Directors to be repurchased. + References No definition available. + Details
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- Definition Represents the face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that is permitted to be authorized by the Board of Directors; generally not indicative of the fair market value per share. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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 210.5-02.28) -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 29 -Article 5 + Details
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