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Share-Based Compensation (Summary Of Unvested Restricted Stock Awards and Units, Performance-Based Restricted Stock Awards And Performance Share Units) (Parenthetical) (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2020 shares
Performance Share Units [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Maximum common shares that could be awarded based upon total shareholder return | 3.2

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- Definition Common shares that could be awarded based upon total shareholder return. + References No definition available. + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |