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DERIVATIVES AND HEDGING - Schedule of the Notional Volume of Derivative Instruments (Details) gal in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) MWh MMBTU gal | Dec. 31, 2024 USD ($) MWh MMBTU gal
Power (MWhs) |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 327.3 | 282.4
Power (MWhs) | AEP Texas |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 0.0 | 0.0
Power (MWhs) | APCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 37.9 | 23.6
Power (MWhs) | I&M |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 11.7 | 7.7
Power (MWhs) | OPCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 1.8 | 2.0
Power (MWhs) | PSO |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 11.3 | 5.0
Power (MWhs) | SWEPCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MWh | 9.4 | 4.6
Natural Gas (MMBtus) |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 168.5 | 152.8
Natural Gas (MMBtus) | AEP Texas |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 0.0 | 0.0
Natural Gas (MMBtus) | APCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 46.8 | 42.2
Natural Gas (MMBtus) | I&M |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 0.0 | 0.0
Natural Gas (MMBtus) | OPCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 0.0 | 0.0
Natural Gas (MMBtus) | PSO |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 42.0 | 46.2
Natural Gas (MMBtus) | SWEPCo |  |
Derivative [Line Items] |  |
Notional amount, energy measure | MMBTU | 19.2 | 15.4
Heating Oil and Gasoline (Gallons) |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 7.5 | 7.9
Heating Oil and Gasoline (Gallons) | AEP Texas |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 2.1 | 2.0
Heating Oil and Gasoline (Gallons) | APCo |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 0.9 | 0.9
Heating Oil and Gasoline (Gallons) | I&M |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 1.4 | 2.0
Heating Oil and Gasoline (Gallons) | OPCo |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 1.1 | 1.1
Heating Oil and Gasoline (Gallons) | PSO |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 0.7 | 0.7
Heating Oil and Gasoline (Gallons) | SWEPCo |  |
Derivative [Line Items] |  |
Notional amount, volume | gal | 0.9 | 0.9
Interest Rate (USD) |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 39.5 | $ 59.3
Interest Rate (USD) | AEP Texas |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate (USD) | APCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate (USD) | I&M |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate (USD) | OPCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate (USD) | PSO |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate (USD) | SWEPCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate |  |
Derivative [Line Items] |  |
Derivative, notional amount | 950.0 | 950.0
Interest Rate | AEP Texas |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate | APCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate | I&M |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate | OPCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate | PSO |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Interest Rate | SWEPCo |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0.0 | $ 0.0

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