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Common and Preferred Shares and Warrants (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Authorized shares and a reconciliation of common shares issued and outstanding |  |  |
Common shares, authorized | 3,600 | 3,600 | 3,600
Shares issued and outstanding at beginning of year | 969 | 1,023 | 1,064
Repurchases of common shares | (70) | (59) | (49)
Other, primarily stock option exercises and RSAs granted | 5 | 5 | 8
Shares issued and outstanding as of December 31 | 904 | 969 | 1,023
Stockholders' Equity Note (Textuals) [Abstract] |  |  |
Shares reserved for issuance under employee stock and employee benefit plans | 35 |  |

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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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- Definition Schedule of stock by class. + References No definition available. + 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 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 + Details
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- Definition 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). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 + Details
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