v3.25.2
DERIVATIVES AND HEDGING - Schedule of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Assets:    
Gross Amounts Recognized $ 1,422.8 $ 1,039.1
Current Risk Management Assets 469.3 210.4
Long-term Risk Management Assets 258.9 289.1
Total Assets 728.2 499.5
Liabilities:    
Gross Amounts Recognized 912.9 780.4
Current Risk Management Liabilities, Net 106.1 100.0
Long-term Risk Management Liabilities, Net 191.6 224.4
Total Liabilities 297.7 324.4
Total MTM Derivative Contract Net Assets (Liabilities) 430.5 175.1
Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 815.4 479.1
Gross Amounts Offset (346.1) (268.7)
Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 607.4 560.0
Gross Amounts Offset (348.5) (270.9)
Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 437.3 351.7
Gross Amounts Offset (331.2) (251.7)
Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 475.6 428.7
Gross Amounts Offset (284.0) (204.3)
AEP Texas    
Assets:    
Gross Amounts Recognized 0.0 0.0
Current Risk Management Assets 0.0 0.0
Long-term Risk Management Assets 0.0 0.0
Total Assets 0.0 0.0
Liabilities:    
Gross Amounts Recognized 0.2 0.3
Current Risk Management Liabilities, Net 0.0 0.0
Long-term Risk Management Liabilities, Net 0.0 0.0
Total Liabilities 0.0 0.0
Total MTM Derivative Contract Net Assets (Liabilities) 0.0 0.0
AEP Texas | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.0 0.0
Gross Amounts Offset 0.0 0.0
AEP Texas | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.0 0.0
Gross Amounts Offset 0.0 0.0
AEP Texas | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 0.2 0.3
Gross Amounts Offset (0.2) (0.3)
AEP Texas | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 0.0 0.0
Gross Amounts Offset 0.0 0.0
APCo    
Assets:    
Gross Amounts Recognized 113.5 42.2
Current Risk Management Assets 108.7 35.7
Long-term Risk Management Assets 1.2 1.4
Total Assets 109.9 37.1
Liabilities:    
Gross Amounts Recognized 6.4 7.4
Current Risk Management Liabilities, Net 2.0 2.0
Long-term Risk Management Liabilities, Net 0.3 0.2
Total Liabilities 2.3 2.2
Total MTM Derivative Contract Net Assets (Liabilities) 107.6 34.9
APCo | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 111.4 40.2
Gross Amounts Offset (2.7) (4.5)
APCo | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 2.1 2.0
Gross Amounts Offset (0.9) (0.6)
APCo | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 5.2 6.6
Gross Amounts Offset (3.2) (4.6)
APCo | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 1.2 0.8
Gross Amounts Offset (0.9) (0.6)
I&M    
Assets:    
Gross Amounts Recognized 32.9 29.7
Current Risk Management Assets 12.3 18.4
Long-term Risk Management Assets 0.0 0.0
Total Assets 12.3 18.4
Liabilities:    
Gross Amounts Recognized 31.6 12.6
Current Risk Management Liabilities, Net 0.9 0.3
Long-term Risk Management Liabilities, Net 0.3 0.4
Total Liabilities 1.2 0.7
Total MTM Derivative Contract Net Assets (Liabilities) 11.1 17.7
I&M | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 29.4 28.5
Gross Amounts Offset (17.1) (10.1)
I&M | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 3.5 1.2
Gross Amounts Offset (3.5) (1.2)
I&M | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 27.5 10.5
Gross Amounts Offset (26.6) (10.2)
I&M | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 4.1 2.1
Gross Amounts Offset (3.8) (1.7)
OPCo    
Assets:    
Gross Amounts Recognized 0.0 0.0
Current Risk Management Assets 0.0 0.0
Long-term Risk Management Assets 0.0 0.0
Total Assets 0.0 0.0
Liabilities:    
Gross Amounts Recognized 47.8 47.7
Current Risk Management Liabilities, Net 5.9 7.3
Long-term Risk Management Liabilities, Net 41.8 40.2
Total Liabilities 47.7 47.5
Total MTM Derivative Contract Net Assets (Liabilities) (47.7) (47.5)
OPCo | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.0 0.0
Gross Amounts Offset 0.0 0.0
OPCo | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.0 0.0
Gross Amounts Offset 0.0 0.0
OPCo | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 6.0 7.5
Gross Amounts Offset (0.1) (0.2)
OPCo | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 41.8 40.2
Gross Amounts Offset 0.0 0.0
PSO    
Assets:    
Gross Amounts Recognized 100.1 23.9
Current Risk Management Assets 96.9 20.6
Long-term Risk Management Assets 0.0 1.4
Total Assets 96.9 22.0
Liabilities:    
Gross Amounts Recognized 11.4 7.8
Current Risk Management Liabilities, Net 5.6 5.8
Long-term Risk Management Liabilities, Net 2.5 0.0
Total Liabilities 8.1 5.8
Total MTM Derivative Contract Net Assets (Liabilities) 88.8 16.2
PSO | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 100.0 22.3
Gross Amounts Offset (3.1) (1.7)
PSO | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.1 1.6
Gross Amounts Offset (0.1) (0.2)
PSO | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 8.8 7.6
Gross Amounts Offset (3.2) (1.8)
PSO | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 2.6 0.2
Gross Amounts Offset (0.1) (0.2)
SWEPCo    
Assets:    
Gross Amounts Recognized 71.7 19.1
Current Risk Management Assets 70.4 18.1
Long-term Risk Management Assets 0.0 0.0
Total Assets 70.4 18.1
Liabilities:    
Gross Amounts Recognized 5.1 3.4
Current Risk Management Liabilities, Net 3.3 2.3
Long-term Risk Management Liabilities, Net 0.5 0.0
Total Liabilities 3.8 2.3
Total MTM Derivative Contract Net Assets (Liabilities) 66.6 15.8
SWEPCo | Current Risk Management Assets    
Assets:    
Gross Amounts Recognized 71.3 19.1
Gross Amounts Offset (0.9) (1.0)
SWEPCo | Long-term Risk Management Assets    
Assets:    
Gross Amounts Recognized 0.4 0.0
Gross Amounts Offset (0.4) 0.0
SWEPCo | Current Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 4.2 3.4
Gross Amounts Offset (0.9) (1.1)
SWEPCo | Long-term Risk Management Liabilities    
Liabilities:    
Gross Amounts Recognized 0.9 0.0
Gross Amounts Offset $ (0.4) $ 0.0