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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Investments (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Outstanding Indebtedness | $ 997.0 | $ 1,100.0
APPALACHIAN POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Outstanding Indebtedness | 156.0 | 168.0
INDIANA MICHIGAN POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Outstanding Indebtedness | 78.0 | 84.0
OHIO POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Outstanding Indebtedness | 199.0 | 213.0
Billings from AEP Service Corporation | AEP TEXAS INC. |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 26.1 | 15.1
Maximum Exposure | 26.1 | 15.1
Billings from AEP Service Corporation | AEP TRANSMISSION COMPANY, LLC |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 29.3 | 17.9
Maximum Exposure | 29.3 | 17.9
Billings from AEP Service Corporation | APPALACHIAN POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 36.4 | 21.1
Maximum Exposure | 36.4 | 21.1
Billings from AEP Service Corporation | INDIANA MICHIGAN POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 25.1 | 14.3
Maximum Exposure | 25.1 | 14.3
Billings from AEP Service Corporation | OHIO POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 34.5 | 19.0
Maximum Exposure | 34.5 | 19.0
Billings from AEP Service Corporation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 19.2 | 10.6
Maximum Exposure | 19.2 | 10.6
Billings from AEP Service Corporation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 22.0 | 12.7
Maximum Exposure | 22.0 | 12.7
Capital Contribution From Parent |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 4.4 | 4.4
Maximum Exposure | 4.4 | 4.4
Capital Contribution From Parent | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 7.6 | 7.6
Maximum Exposure | 7.6 | 7.6
Retained Earnings | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 0.3 | 0.4
Maximum Exposure | 0.3 | 0.4
SWEPCo's Share of Obligations | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 0.0 | 0.0
Maximum Exposure | 15.6 | 19.2
Total Investment |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 4.4 | 4.4
Maximum Exposure | 437.6 | 469.7
Total Investment | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 7.9 | 8.0
Maximum Exposure | 23.5 | 27.2
AEP's Ratio of OVEC Debt |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
As Reported on the Balance Sheet | 0.0 | 0.0
Maximum Exposure | $ 433.2 | $ 465.3

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