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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