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BENEFIT PLANS - Schedule of Estimated Future Benefit Payments and Contributions (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | $ 101.2
Pension Plans | AEP TEXAS INC. |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 11.8
Pension Plans | APPALACHIAN POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.5
Pension Plans | INDIANA MICHIGAN POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 2.6
Pension Plans | OHIO POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.0
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 2.0
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 8.8
OPEB |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 2.7
OPEB | AEP TEXAS INC. |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.0
OPEB | APPALACHIAN POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 1.4
OPEB | INDIANA MICHIGAN POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.0
OPEB | OHIO POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.0
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | 0.0
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions and payments during the next fiscal year | $ 0.0

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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