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DERIVATIVES AND HEDGING - Schedule of Gain (Loss) Recognized on Risk Management Contracts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | $ 151.1 | $ (322.8) | $ 693.7
Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 73.0 | (94.8) | 52.6
Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 270.7 | 169.7 | 299.7
Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (23.7) | 24.6 | 11.1
Revenues | Generation & Marketing |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (171.5) | (423.8) | 313.8
Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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 | 3.0 | 2.5 | 5.0
Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.2) | (0.2) | 4.8
Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.2) | (0.8) | 6.7
AEP Texas |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.2) | (0.6) | 2.8
AEP Texas | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | (0.2) | 0.1
AEP Texas | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | (0.6)
AEP Texas | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
AEP Texas | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
AEP Texas | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 1.5
AEP Texas | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | (0.3) | 1.8
APCo |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 78.0 | (18.6) | 88.6
APCo | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 21.7 | (21.9) | (0.1)
APCo | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 53.4 | 1.0 | 82.4
APCo | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
APCo | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.2 | 0.1 | 0.5
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 | 2.7 | 2.3 | 4.5
APCo | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.4
APCo | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 0.9
I&M |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (7.5) | 29.2 | 19.6
I&M | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 2.8 | (3.1) | (0.8)
I&M | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 13.4 | 7.8 | 8.6
I&M | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
I&M | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (23.9) | 24.5 | 10.6
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 | 0.2 | 0.1 | 0.1
I&M | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.5
I&M | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 0.6
OPCo |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (1.8) | (14.1) | 57.8
OPCo | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (1.8) | (14.0) | 52.1
OPCo | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 3.7
OPCo | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
OPCo | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
OPCo | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.8
OPCo | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 1.2
PSO |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 119.6 | 58.8 | 103.7
PSO | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 26.0 | (29.8) | 3.6
PSO | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 93.6 | 88.7 | 98.5
PSO | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
PSO | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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 | 0.2
PSO | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | 0.0 | 0.6
PSO | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 0.0 | (0.1) | 0.8
SWEPCo |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 109.1 | 55.0 | 77.7
SWEPCo | Regulatory Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 14.2 | (15.5) | (2.1)
SWEPCo | Regulatory Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 95.0 | 70.7 | 77.9
SWEPCo | Revenues | Vertically Integrated Utilities Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
SWEPCo | Revenues | Electric Generation, Transmission and Distribution Revenues |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | 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
SWEPCo | Other Operation |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | (0.1) | 0.0 | 0.8
SWEPCo | Maintenance |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total Gain (Loss) on Risk Management Contracts | $ 0.0 | $ (0.2) | $ 1.1

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