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BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Life insurance administrative load | 5.00% |  |
Investment gains or losses period | 5 years |  |
Employer contribution cost | $ 379 | $ 396 | $ 329
Withdrawal liability | $ 12,000 | $ 13,000 |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.55% | 5.05% |
Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
AEP TEXAS INC. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.70% | 5.20% |
AEP TEXAS INC. | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
AEP TEXAS INC. | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
APPALACHIAN POWER COMPANY | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.55% | 4.95% |
APPALACHIAN POWER COMPANY | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
APPALACHIAN POWER COMPANY | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.70% | 5.20% |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
OHIO POWER COMPANY | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 6.00% | 5.45% |
OHIO POWER COMPANY | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
OHIO POWER COMPANY | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
INDIANA MICHIGAN POWER COMPANY | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.50% | 5.05% |
INDIANA MICHIGAN POWER COMPANY | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
INDIANA MICHIGAN POWER COMPANY | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.55% | 5.00% |
SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.00% |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 11.50% |  |
Defined Contribution, Employer Matching Conditions One |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | AEP TEXAS INC. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | APPALACHIAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | OHIO POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | INDIANA MICHIGAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions One | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 100.00% |  |
Employer matching contribution, percent of employees contribution | 1.00% |  |
Defined Contribution, Employer Matching Conditions Two |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | AEP TEXAS INC. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | APPALACHIAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | OHIO POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | INDIANA MICHIGAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |
Defined Contribution, Employer Matching Conditions Two | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 70.00% |  |
Employer matching contribution, percent of employees contribution | 5.00% |  |

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