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STOCK-BASED COMPENSATION - Performance Shares Earned (Details) - Performance Shares - shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance Score | 109.80% | 106.10% | 131.10%
Performance Shares Earned (in shares) | 477,487 | 540,863 | 512,660
Performance Shares Mandatorily Deferred as AEP Career Shares (in shares) | 39,172 | 70,377 | 28,282
Performance Shares Voluntarily Deferred into the Incentive Compensation Deferral Program (in shares) | 21,245 | 22,716 | 23,609
Performance Shares to be Settled (in shares) | 417,070 | 447,770 | 460,769

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- Definition Line items represent financial concepts included in a table. 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