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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 9.2 | 8.7 | 9.7
Stock repurchase program remaining authorization | 0.0 |  |
2015 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 0.0 | 9.0
Stock repurchase program remaining authorization | 0.0 |  |
2016 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 9.2 | 8.7 | 0.7
Stock repurchase program remaining authorization | 0.0 |  |
2018 Authorization |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchased | 0.0 | 0.0 | 0.0
Stock repurchase program remaining authorization | 0.0 |  |

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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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