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Capital Stock (Stock Repurchases Pursuant To Board Of Director Authorizations) (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 8.7 | 9.7 | 27.8
Stock repurchase program remaining authorization | 10.6 |  |
1997 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 0.0 | 0.9
Stock repurchase program remaining authorization | 0.0 |  |
2007 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 0.0 | 0.9
Stock repurchase program remaining authorization | 0.0 |  |
2014 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 0.0 | 20.0
Stock repurchase program remaining authorization | 0.0 |  |
2015 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 9.0 | 6.0
Stock repurchase program remaining authorization | 0.0 |  |
2016 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 8.7 | 0.7 | 0.0
Stock repurchase program remaining authorization | 10.6 |  |

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: 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 2: 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 3: 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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