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DERIVATIVES AND HEDGING - Schedule of Gain (Loss) Recognized on Risk Management Contracts (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | $ (39.9) | $ (3.1)
Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 52.8 | 13.5
Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 80.3 | 52.7
Revenues | Vertically Integrated Utilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | (32.6) | (25.7)
Revenues | Generation & Marketing |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | (143.2) | (44.7)
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
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 | 3.0 | 1.0
Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) |
Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | 0.1
AEP Texas |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | 0.4
AEP Texas | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | 0.2
AEP Texas | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.2
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
AEP Texas | Revenues | Generation & Marketing |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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
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
AEP Texas | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
AEP Texas | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0
APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 42.4 | 14.0
APCo | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | (0.1)
APCo | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 39.3 | 13.1
APCo | Revenues | Vertically Integrated Utilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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
APCo | Revenues | Electric Generation, Transmission and Distribution |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.1 | 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 | 2.9 | 0.9
APCo | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
APCo | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0
I&M |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | (28.3) | (25.2)
I&M | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (1.6)
I&M | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 4.3 | 2.2
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
I&M | Revenues | Generation & Marketing |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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 | (32.7) | (25.8)
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 | 0.0
I&M | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
I&M | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0
OPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 50.7 | 8.6
OPCo | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 47.5 | 8.6
OPCo | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 3.2 | 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
OPCo | Revenues | Generation & Marketing |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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
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
OPCo | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
OPCo | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0
PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 15.5 | 17.1
PSO | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 3.8 | (1.2)
PSO | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 11.7 | 18.3
PSO | Revenues | Vertically Integrated Utilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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
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
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
PSO | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
PSO | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0
SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 15.0 | 19.9
SWEPCo | Regulatory Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 1.1 | 4.9
SWEPCo | Regulatory Liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 13.9 | 15.0
SWEPCo | Revenues | Vertically Integrated Utilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 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
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
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
SWEPCo | Other Operation |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 |
SWEPCo | Maintenance |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total Gain (Loss) on Risk Management Contracts | $ 0.0 | $ 0.0

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