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BENEFIT PLANS - Schedule of Pension and OPEB Assets (Details) | Dec. 31, 2024 | Dec. 31, 2023
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Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 100.00% | 100.00%
Pension Plans | AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 7.90% | 8.10%
Pension Plans | APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 13.30% | 13.40%
Pension Plans | INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 13.80% | 13.40%
Pension Plans | OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 10.40% | 10.20%
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 5.50% | 5.40%
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 5.20% | 5.50%
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 100.00% | 100.00%
OPEB | AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 8.30% | 8.20%
OPEB | APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 14.40% | 14.50%
OPEB | INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 11.90% | 12.20%
OPEB | OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 10.40% | 10.60%
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 5.40% | 5.40%
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 6.80% | 6.60%

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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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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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