v3.25.2
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