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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Billings (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AEP TEXAS INC. |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | $ 242.6 | $ 228.5 | $ 236.8
AEP TRANSMISSION COMPANY, LLC |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | 289.7 | 269.9 | 286.6
APPALACHIAN POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | 335.3 | 324.9 | 347.5
INDIANA MICHIGAN POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | 187.6 | 178.4 | 192.4
OHIO POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | 283.4 | 269.5 | 272.5
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | 157.4 | 138.6 | 142.3
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Billings from VIE | $ 194.4 | $ 185.1 | $ 192.5

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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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