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DERIVATIVES AND HEDGING - Schedule of Location and Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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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

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