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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Share-Based Payment Arrangement, Activity | The HR Committee awarded performance shares and reinvested dividends on outstanding performance shares and AEP career shares as follows:
|  | Years Ended December 31,
Performance Shares |  | 2024 |  | 2023 |  | 2022
Awarded Shares (in thousands) |  | 440.7 |  |  | 486.7 |  |  | 530.3 |
Weighted-Average Share Fair Value at Grant Date |  | $ | 99.76 |  |  | $ | 98.63 |  |  | $ | 97.61 |
Vesting Period (in years) |  | 3 |  | 3 |  | 3
Performance Shares and AEP Career Shares (Reinvested Dividends Portion) |  | Years Ended December 31,
| 2024 |  | 2023 |  | 2022
Awarded Shares (in thousands) |  | 66.0 |  |  | 81.3 |  |  | 63.3 |
Weighted-Average Fair Value at Grant Date |  | $ | 91.75 |  |  | $ | 82.02 |  |  | $ | 98.73 |
Vesting Period (in years) |  | (a) |  | (a) |  | (a)
(a)The vesting period for the reinvested dividends on performance shares is equal to the remaining life of the related performance shares. Dividends on AEP career shares vest immediately when the dividend is awarded but are not settled in AEP common stock until after the participant’s AEP employment ends. The performance scores and shares earned for the three-year periods were as follows:
|  | Years Ended December 31,
Performance Shares |  | 2024 (b) |  | 2023 |  | 2022
Performance Score |  | 109.8 | % |  | 106.1 | % |  | 131.1 | %
Performance Shares Earned |  | 477,487 |  |  | 540,863 |  |  | 512,660 |
Performance Shares Mandatorily Deferred as AEP Career Shares |  | 39,172 |  |  | 70,377 |  |  | 28,282 |
Performance Shares Voluntarily Deferred into the Incentive Compensation Deferral Program |  | 21,245 |  |  | 22,716 |  |  | 23,609 |
Performance Shares to be Settled (a) |  | 417,070 |  |  | 447,770 |  |  | 460,769 |
(a)Performance shares settled in AEP common stock in the quarter following the end of the year shown. (b)Performance shares earned, deferred and settled were calculated based on the estimated performance score. The settlements were as follows:
|  | Years Ended December 31,
Performance Shares and AEP Career Shares |  | 2024 |  | 2023 |  | 2022
|  | (in millions)
AEP Common Stock Settlements for Performance Shares |  | $ | 38.1 |  |  | $ | 41.8 |  |  | $ | 43.2 |
AEP Common Stock Settlements for Career Share Distributions |  | 8.4 |  |  | 8.3 |  |  | 5.1 |
The HR Committee awarded RSUs, including additional units awarded as dividends, as follows:
|  | Years Ended December 31,
Restricted Stock Units |  | 2024 |  | 2023 |  | 2022
Awarded Units (in thousands) |  | 417.0 |  |  | 268.4 |  |  | 290.4 |
Weighted-Average Grant Date Fair Value |  | $ | 87.85 |  |  | $ | 88.52 |  |  | $ | 90.48 |
The total fair value and total intrinsic value of restricted stock units vested were as follows:
|  | Years Ended December 31,
Restricted Stock Units |  | 2024 |  | 2023 |  | 2022
|  | (in millions)
Fair Value of Restricted Stock Units Vested |  | $ | 25.9 |  |  | $ | 18.8 |  |  | $ | 17.8 |
Intrinsic Value of Restricted Stock Units Vested (a) |  | 27.3 |  |  | 19.0 |  |  | 20.3 |
(a)Intrinsic value is calculated as market price at the vesting date. The Board of Directors awarded stock units, including units awarded for dividends, as follows:
|  | Years Ended December 31,
Stock Unit Accumulation Plan for Non-Employee Directors |  | 2024 |  | 2023 |  | 2022
Awarded Units (in thousands) |  | 18.9 |  |  | 19.8 |  |  | 14.5 |
Weighted-Average Grant Date Fair Value |  | $ | 91.42 |  |  | $ | 82.14 |  |  | $ | 95.16 |
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option | A summary of the status of AEP’s nonvested Performance Shares as of December 31, 2024 and changes during the year ended December 31, 2024 were as follows:
Nonvested Performance Shares |  | Shares |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Nonvested as of January 1, 2024 |  | 889.9 |  |  | $ | 99.49 |
Awarded |  | 440.7 |  |  | 99.76 |
Dividends |  | 49.4 |  |  | 91.82 |
Vested (a) |  | (440.6) |  |  | 100.52 |
Forfeited |  | (161.8) |  |  | 87.94 |
Nonvested as of December 31, 2024 |  | 777.6 |  |  | 100.97 |
(a)The vested Performance Shares will be converted to an estimated 417 thousand shares based on the closing share price on the day before settlement.
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Valuation Assumptions | The assumptions used in the Monte Carlo valuations were as follows:
|  | Years Ended December 31,
Assumptions |  | 2024 |  | 2023 |  | 2022
Valuation Period (in years) (a) |  | 2.85 |  | 2.87 |  | 2.86
Expected Volatility Minimum |  | 18.79 | % |  | 21.23 | % |  | 25.92 | %
Expected Volatility Maximum |  | 33.29 | % |  | 39.00 | % |  | 40.82 | %
Expected Volatility Average |  | 22.34 | % |  | 25.35 | % |  | 31.09 | %
Dividend Rate (b) |  | — | % |  | — | % |  | — | %
Risk Free Rate |  | 4.43 | % |  | 4.32 | % |  | 1.64 | %
(a)Period from award date to vesting date. (b)Equivalent to reinvesting dividends.
Share-Based Payment Arrangement, Restricted Stock Unit, Activity | A summary of the status of AEP’s nonvested RSUs as of December 31, 2024 and changes during the year ended December 31, 2024 were as follows:
Nonvested Restricted Stock Units |  | Shares/Units |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Nonvested as of January 1, 2024 |  | 431.1 |  |  | $ | 88.57 |
Awarded |  | 417.0 |  |  | 87.85 |
Vested |  | (296.8) |  |  | 87.26 |
Forfeited |  | (74.0) |  |  | 89.97 |
Nonvested as of December 31, 2024 |  | 477.3 |  |  | 88.37 |
Share-Based Payment Arrangement, Cost by Plan | The compensation cost for share-based payment arrangements, the actual tax benefit from the tax deductions for compensation cost recognized in income and the total compensation cost capitalized were as follows:
|  | Years Ended December 31,
Share-based Compensation Plans |  | 2024 |  | 2023 |  | 2022
|  | (in millions)
Compensation Cost for Share-based Payment Arrangements (a) |  | $ | 52.9 |  |  | $ | 50.9 |  |  | $ | 63.3 |
Actual Tax Benefit |  | 7.4 |  |  | 6.4 |  |  | 8.0 |
Total Compensation Cost Capitalized |  | 13.9 |  |  | 15.3 |  |  | 16.0 |
(a)Compensation cost for share-based payment arrangements is included in Other Operation and Maintenance expenses on the statements of income.

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