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DERIVATIVES AND HEDGING - Schedule of Gain (Loss) Recognized on Risk Management Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | $ 70.7 | $ 77.0 | $ 268.8 | $ 73.9
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 | (6.1) | 31.7 | (4.5) | 45.2
Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 77.2 | 92.5 | 230.1 | 145.2
Revenues | Vertically Integrated Utilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 12.3 | 4.3 | (20.2) | (21.4)
Revenues | Generation & Marketing |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (13.0) | (53.0) | 60.2 | (97.7)
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 | 0.7 | 0.7 | 3.8 | 1.7
Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | 0.3 |  | 0.3
Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.3) | 0.5 | (0.4) | 0.6
AEP Texas |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | 0.1 | 0.0 | 0.5
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 | 0.1 | 0.2 | 0.3
AEP Texas | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.2) | 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 | (0.1) | 0.1 |  | 0.1
AEP Texas | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | 0.1 | (0.1) | 0.1
APCo |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 3.5 | 28.6 | 63.6 | 42.6
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 | (0.1) | 15.2 | 0.0 | 15.1
APCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 2.5 | 12.6 | 59.5 | 25.7
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 | 0.2 | 0.0 | 0.3 | 0.1
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 | 0.9 | 0.7 | 3.8 | 1.6
APCo | Other Operation |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 |  | 0.0
APCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.1 | 0.0 | 0.1
I&M |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 15.4 | 16.3 | (6.7) | (8.9)
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) | 4.6 | (1.0) | 3.0
I&M | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 4.3 | 7.1 | 14.8 | 9.3
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 | 12.2 | 4.3 | (20.5) | (21.5)
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 | (0.1) | 0.1 | 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 |  | 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 | 0.1
OPCo |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 6.0 | (3.0) | 5.5 | 5.6
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 | 3.4 | (3.1) | (0.3) | 5.5
OPCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 2.6 | 0.0 | 5.8 | 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 |  | 0.0
OPCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.1 | 0.0 | 0.1
PSO |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 22.8 | 42.7 | 65.2 | 59.8
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 | (5.6) | 8.9 | (1.8) | 7.7
PSO | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 28.4 | 33.8 | 67.0 | 52.1
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 |  | 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 | 38.4 | 34.9 | 68.7 | 54.8
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 | (3.0) | 0.2 | (1.9) | 5.1
SWEPCo | Regulatory Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | 41.5 | 34.6 | 70.7 | 49.6
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 |  | 0.0
SWEPCo | Maintenance |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total Gain (Loss) on Risk Management Contracts | $ (0.1) | $ 0.1 | $ (0.1) | $ 0.1

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