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DERIVATIVES AND HEDGING - Schedule of Location and Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Total Assets | $ 1,317.5 | $ 1,039.1
Total Liabilities | 993.8 | 780.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 323.7 | 258.7
Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 742.7 | 479.1
Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 574.8 | 560.0
Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 540.4 | 351.7
Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 453.4 | 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 | 34.9 | 42.2
Total Liabilities | 6.4 | 7.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 28.5 | 34.8
APCo | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 30.9 | 40.2
APCo | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 4.0 | 2.0
APCo | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 5.6 | 6.6
APCo | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.8 | 0.8
I&M |  |
Derivative [Line Items] |  |
Total Assets | 12.2 | 29.7
Total Liabilities | 29.5 | 12.6
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | (17.3) | 17.1
I&M | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 12.2 | 28.5
I&M | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 1.2
I&M | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 29.5 | 10.5
I&M | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 2.1
OPCo |  |
Derivative [Line Items] |  |
Total Assets | 0.0 |
Total Liabilities | 51.3 | 47.7
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | (51.3) | (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 | 5.2 | 7.5
OPCo | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 46.1 | 40.2
PSO |  |
Derivative [Line Items] |  |
Total Assets | 36.4 | 23.9
Total Liabilities | 3.3 | 7.8
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 33.1 | 16.1
PSO | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 34.6 | 22.3
PSO | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.8 | 1.6
PSO | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 1.2 | 7.6
PSO | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 2.1 | 0.2
SWEPCo |  |
Derivative [Line Items] |  |
Total Assets | 18.8 | 19.1
Total Liabilities | 1.4 | 3.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 17.4 | 15.7
SWEPCo | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 18.3 | 19.1
SWEPCo | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.5 | 0.0
SWEPCo | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.5 | 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 | 649.0 | 425.0
Commodity | Not Designated as Hedging Instrument | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 490.8 | 475.4
Commodity | Not Designated as Hedging Instrument | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 493.6 | 304.1
Commodity | Not Designated as Hedging Instrument | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 410.8 | 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 | 30.9 | 40.2
Commodity | Not Designated as Hedging Instrument | APCo | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 4.0 | 2.0
Commodity | Not Designated as Hedging Instrument | APCo | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 5.6 | 6.6
Commodity | Not Designated as Hedging Instrument | APCo | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.8 | 0.8
Commodity | Not Designated as Hedging Instrument | I&M | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 12.2 | 28.5
Commodity | Not Designated as Hedging Instrument | I&M | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 1.2
Commodity | Not Designated as Hedging Instrument | I&M | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 29.5 | 10.5
Commodity | Not Designated as Hedging Instrument | I&M | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 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 | 5.2 | 7.5
Commodity | Not Designated as Hedging Instrument | OPCo | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 46.1 | 40.2
Commodity | Not Designated as Hedging Instrument | PSO | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 34.6 | 22.3
Commodity | Not Designated as Hedging Instrument | PSO | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.8 | 1.6
Commodity | Not Designated as Hedging Instrument | PSO | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 1.2 | 7.6
Commodity | Not Designated as Hedging Instrument | PSO | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 2.1 | 0.2
Commodity | Not Designated as Hedging Instrument | SWEPCo | Current Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 18.3 | 19.1
Commodity | Not Designated as Hedging Instrument | SWEPCo | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.5 | 0.0
Commodity | Not Designated as Hedging Instrument | SWEPCo | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.5 | 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 | 93.7 | 54.1
Commodity | Designated as Hedging Instrument | Long-term Risk Management Assets |  |
Derivative [Line Items] |  |
Total Assets | 84.0 | 84.6
Commodity | Designated as Hedging Instrument | Current Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 9.6 | 11.3
Commodity | Designated as Hedging Instrument | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 11.4 | 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 | 37.2 | 36.3
Interest Rate (USD) | Designated as Hedging Instrument | Long-term Risk Management Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 31.2 | 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

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