v3.25.2
DERIVATIVES AND HEDGING - Schedule of Location and Fair Value of Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Total Assets $ 1,422.8 $ 1,039.1
Total Liabilities 912.9 780.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized 509.9 258.7
Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 815.4 479.1
Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 607.4 560.0
Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 437.3 351.7
Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 475.6 428.7
AEP Texas    
Derivative [Line Items]    
Total Assets 0.0 0.0
Total Liabilities 0.2 0.3
Total MTM Derivative Contract Net Assets (Liabilities) Recognized (0.2) (0.3)
AEP Texas | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
AEP Texas | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
AEP Texas | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.2 0.3
AEP Texas | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
APCo    
Derivative [Line Items]    
Total Assets 113.5 42.2
Total Liabilities 6.4 7.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized 107.1 34.8
APCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 111.4 40.2
APCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 2.1 2.0
APCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 5.2 6.6
APCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 1.2 0.8
I&M    
Derivative [Line Items]    
Total Assets 32.9 29.7
Total Liabilities 31.6 12.6
Total MTM Derivative Contract Net Assets (Liabilities) Recognized 1.3 17.1
I&M | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 29.4 28.5
I&M | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 3.5 1.2
I&M | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 27.5 10.5
I&M | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 4.1 2.1
OPCo    
Derivative [Line Items]    
Total Assets 0.0 0.0
Total Liabilities 47.8 47.7
Total MTM Derivative Contract Net Assets (Liabilities) Recognized (47.8) (47.7)
OPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
OPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
OPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 6.0 7.5
OPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 41.8 40.2
PSO    
Derivative [Line Items]    
Total Assets 100.1 23.9
Total Liabilities 11.4 7.8
Total MTM Derivative Contract Net Assets (Liabilities) Recognized 88.7 16.1
PSO | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 100.0 22.3
PSO | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.1 1.6
PSO | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 8.8 7.6
PSO | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 2.6 0.2
SWEPCo    
Derivative [Line Items]    
Total Assets 71.7 19.1
Total Liabilities 5.1 3.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized 66.6 15.7
SWEPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 71.3 19.1
SWEPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.4 0.0
SWEPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 4.2 3.4
SWEPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.9 0.0
Commodity | Not Designated as Hedging Instrument | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 748.4 425.0
Commodity | Not Designated as Hedging Instrument | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 527.6 475.4
Commodity | Not Designated as Hedging Instrument | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 390.3 304.1
Commodity | Not Designated as Hedging Instrument | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 443.8 390.7
Commodity | Not Designated as Hedging Instrument | AEP Texas | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Not Designated as Hedging Instrument | AEP Texas | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Not Designated as Hedging Instrument | AEP Texas | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.2 0.3
Commodity | Not Designated as Hedging Instrument | AEP Texas | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Not Designated as Hedging Instrument | APCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 111.4 40.2
Commodity | Not Designated as Hedging Instrument | APCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 2.1 2.0
Commodity | Not Designated as Hedging Instrument | APCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 5.2 6.6
Commodity | Not Designated as Hedging Instrument | APCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 1.2 0.8
Commodity | Not Designated as Hedging Instrument | I&M | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 29.4 28.5
Commodity | Not Designated as Hedging Instrument | I&M | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 3.5 1.2
Commodity | Not Designated as Hedging Instrument | I&M | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 27.5 10.5
Commodity | Not Designated as Hedging Instrument | I&M | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 4.1 2.1
Commodity | Not Designated as Hedging Instrument | OPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Not Designated as Hedging Instrument | OPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Not Designated as Hedging Instrument | OPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 6.0 7.5
Commodity | Not Designated as Hedging Instrument | OPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 41.8 40.2
Commodity | Not Designated as Hedging Instrument | PSO | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 100.0 22.3
Commodity | Not Designated as Hedging Instrument | PSO | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.1 1.6
Commodity | Not Designated as Hedging Instrument | PSO | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 8.8 7.6
Commodity | Not Designated as Hedging Instrument | PSO | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 2.6 0.2
Commodity | Not Designated as Hedging Instrument | SWEPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 71.3 19.1
Commodity | Not Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.4 0.0
Commodity | Not Designated as Hedging Instrument | SWEPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 4.2 3.4
Commodity | Not Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.9 0.0
Commodity | Designated as Hedging Instrument | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 67.0 54.1
Commodity | Designated as Hedging Instrument | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 79.8 84.6
Commodity | Designated as Hedging Instrument | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 20.1 11.3
Commodity | Designated as Hedging Instrument | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 10.8 2.7
Commodity | Designated as Hedging Instrument | AEP Texas | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | APCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | APCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | APCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | APCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | I&M | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | I&M | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | I&M | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | I&M | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | OPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | OPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | OPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | OPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | PSO | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | PSO | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | PSO | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | PSO | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Current Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Assets    
Derivative [Line Items]    
Total Assets 0.0 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 26.9 36.3
Interest Rate (USD) | Designated as Hedging Instrument | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 21.0 35.3
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Current Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities 0.0 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Liabilities    
Derivative [Line Items]    
Total Liabilities $ 0.0 $ 0.0