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DERIVATIVES AND HEDGING - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Commodity |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | $ 76.9 | $ 98.5
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 30.6 | 33.9
Commodity | AEP Texas |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | I&M |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Interest Rate |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | (0.6) | 3.3
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.1 | 2.8
Interest Rate | AEP Texas |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 5.8 | 6.3
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.7 | 0.7
Interest Rate | APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 4.5 | 5.1
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.8 | 0.8
Interest Rate | I&M |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | (4.8) | (5.1)
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | (0.4) | (0.4)
Interest Rate | PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 2.3 | 3.6
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.2 | 0.2
Interest Rate | SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.8 | 1.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | $ 0.3 | $ 0.3

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