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Share-Based Compensation (Summary Of Unvested Restricted Stock Awards, Performance-Based Restricted Stock Awards And Performance Share Units) (Parenthetical) (Details) shares in Millions |  | 9 Months Ended
--- | --- | ---
Jan. 07, 2021 shares | Sep. 30, 2021 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Conversion of common stock into right to recieve per share | 0.5165 | 0.5165
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 |  | 4.2
Devon and WPX Agreement [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Conversion of common stock into right to recieve per share | 0.5165 |
Conversion of WPX equity awards to Devon equity awards | 4.9 |

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