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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2015
Class of Stock Disclosures [Abstract] |  |  |  |  |  |  |
Cash dividends declared, per share of common stock | $ 0.425 | $ 0.425 | $ 0.425 |  | $ 1.275 |  |
Stock Repurchased During Period, Shares |  |  |  | 1.9 |  |  |
Payments for Repurchase of Common Stock |  |  |  | $ 230,000,000 | $ 230,000,000 | $ 13,000,000 |
2015 $2 Billion Repurchase Agreement |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 1,640,000,000 |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 4: 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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