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DERIVATIVES AND HEDGING - Schedule of Gain (Loss) Recognized on Risk Management Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | $ 72.7 | $ (4.4) | $ 335.9 | $ 69.5
Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | (0.2) |
Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (3.9) | 3.1 | (8.4) | 48.3
Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 58.8 | 60.8 | 283.3 | 206.0
Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 5.9 | (1.1) | (14.3) | (22.5)
Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 11.1 | (67.1) | 71.3 | (164.8)
Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.8 | 0.7 | 4.6 | 2.4
Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.3) |  |
Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.5) | (0.4) | 0.1
AEP Texas |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | (0.8) | 0.1 | (0.3)
AEP Texas | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | (0.1) |
AEP Texas | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | (0.6) | 0.3 | (0.3)
AEP Texas | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
AEP Texas | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
AEP Texas | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
AEP Texas | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
AEP Texas | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
AEP Texas | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) |  |
AEP Texas | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | (0.1) | 0.0
APCo |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 18.8 | 6.4 | 82.4 | 49.0
APCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | 0.0 |
APCo | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.2 | (3.9) | 0.2 | 11.2
APCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 17.9 | 9.8 | 77.4 | 35.5
APCo | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
APCo | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
APCo | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.1 | 0.3 | 0.2
APCo | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.8 | 0.5 | 4.6 | 2.1
APCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 |  |
APCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | (0.1) | (0.1) | 0.0
I&M |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 13.3 | 1.5 | 6.6 | (7.4)
I&M | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | 0.0 |
I&M | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 1.0 | 0.0 | 0.0 | 3.0
I&M | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 6.5 | 2.9 | 21.3 | 12.2
I&M | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
I&M | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
I&M | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 5.8 | (1.2) | (14.7) | (22.7)
I&M | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.1
I&M | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) |  |
I&M | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 0.0 | 0.0
OPCo |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 4.3 | (9.3) | 4.2 | (3.7)
OPCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | 0.0 |
OPCo | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 3.7 | (9.2) | 3.4 | (3.7)
OPCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.7 | 0.0 | 0.9 | 0.0
OPCo | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
OPCo | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
OPCo | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
OPCo | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
OPCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 |  |
OPCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | (0.1) | (0.1) | 0.0
PSO |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 5.3 | 35.4 | 70.5 | 95.2
PSO | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | 0.0 |
PSO | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (11.8) | 11.6 | (13.6) | 19.3
PSO | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 17.1 | 23.8 | 84.1 | 75.9
PSO | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
PSO | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
PSO | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
PSO | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
PSO | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 |  |
PSO | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
SWEPCo |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 14.9 | 28.2 | 83.6 | 83.0
SWEPCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts |  |  | 0.0 |
SWEPCo | Regulatory Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 3.1 | 6.5 | 1.2 | 11.6
SWEPCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 11.8 | 21.8 | 82.5 | 71.4
SWEPCo | Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
SWEPCo | Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
SWEPCo | Revenues | Electric Generation, Transmission and Distribution |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
SWEPCo | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.0 | 0.0
SWEPCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 |  |
SWEPCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | $ 0.0 | $ (0.1) | $ (0.1) | $ 0.0

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