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Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Stock, Shares Outstanding [Roll Forward] |  |  |
Beginning balance, Shares Issued (in shares) | 2,805,961,317 | 2,805,961,317 | 2,805,961,317
Beginning balance, Shares Repurchased (in shares) | (862,689,093) | (845,901,836) | (834,486,794)
Beginning balance, Shares Outstanding (in shares) | 1,943,272,224 | 1,960,059,481 | 1,971,474,523
Stock award activity (in shares) | (408,891) | (566,256) | (732,623)
Repurchases of common stock (in shares) | (41,604,141) | (16,221,001) | (10,682,419)
Ending balance, Shares Issued (in shares) | 2,805,961,317 | 2,805,961,317 | 2,805,961,317
Ending balance, Shares Repurchased (in shares) | (904,702,125) | (862,689,093) | (845,901,836)
Ending balance, Shares Outstanding (in shares) | 1,901,259,192 | 1,943,272,224 | 1,960,059,481

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- Definition Stock Issued During Period, Shares, Treasury Stock Reissued (Forfeited and Returned) + References No definition available. + 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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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + 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 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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