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BENEFIT PLANS - Schedule of Accumulated Benefit Obligation (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | $ 3,649.3 | $ 3,933.5
Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 3,602.4 | 3,878.7
Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 46.9 | 54.8
AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 302.7 | 323.2
AEP TEXAS INC. | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 300.6 | 321.1
AEP TEXAS INC. | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 2.1 | 2.1
APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 434.5 | 485.7
APPALACHIAN POWER COMPANY | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 434.3 | 485.6
APPALACHIAN POWER COMPANY | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 0.2 | 0.1
INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 423.2 | 451.0
INDIANA MICHIGAN POWER COMPANY | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 422.3 | 450.3
INDIANA MICHIGAN POWER COMPANY | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 0.9 | 0.7
OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 326.5 | 354.1
OHIO POWER COMPANY | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 326.4 | 354.0
OHIO POWER COMPANY | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 0.1 | 0.1
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 175.7 | 187.8
PUBLIC SERVICE COMPANY OF OKLAHOMA | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 174.6 | 186.6
PUBLIC SERVICE COMPANY OF OKLAHOMA | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 1.1 | 1.2
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 210.5 | 242.9
SOUTHWESTERN ELECTRIC POWER COMPANY | Qualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 209.5 | 241.9
SOUTHWESTERN ELECTRIC POWER COMPANY | Nonqualified Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | $ 1.0 | $ 1.0

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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