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Common and Preferred Shares and Warrants (Details Textuals) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 26, 2016
Common And Preferred Shares And Warrants (Textuals) [Abstract] |  |  |  |
Common share repurchases authorized |  |  |  | 150,000,000
Common shares repurchased | 70,000,000 | 58,800,000 | 49,000,000 |
Cost basis of common stock repurchased | $ 4,431,000,000 | $ 4,480,000,000 | $ 4,389,000,000 |
Commissions paid included in cost basis of common stock repurchased | $ 1,200,000 | $ 1,100,000 | $ 1,000,000 |
Common shares remaining under share repurchase authorizations | 135,000,000 |  |  |
Shares held as treasury shares | 3,000,000 | 3,000,000 | 3,200,000 |
Cost basis of treasury stock | $ 197,000,000 | $ 242,000,000 | $ 280,000,000 |
Preferred shares, authorized | 20,000,000 | 20,000,000 |  |
Preferred shares, par value | $ 1.67 | $ 1.67 |  |
Depositary Shares, Redemption Amount | $ 1,000 |  |  |
Warrants, issued and outstanding | 0 | 0 | 0 |
Liquidation price per share | $ 1,000,000 |  |  |

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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 Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 + Details
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