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DERIVATIVES AND HEDGING - Schedule of Location and Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Total Assets | $ 1,039.1 | $ 1,167.4
Total Liabilities | 780.4 | 1,083.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 258.7 | 84.0
Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 479.1 | 611.8
Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 560.0 | 555.6
Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 351.7 | 646.7
Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 428.7 | 436.7
AEP Texas |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Total Liabilities | 0.3 | 2.9
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | (0.3) | (2.9)
AEP Texas | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
AEP Texas | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
AEP Texas | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.3 | 2.9
AEP Texas | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
APCo |  |
Derivative [Line Items] |  |
Total Assets | 42.2 | 24.9
Total Liabilities | 7.4 | 25.4
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 34.8 | (0.5)
APCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 40.2 | 24.6
APCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 2.0 | 0.3
APCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 6.6 | 18.5
APCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.8 | 6.9
I&M |  |
Derivative [Line Items] |  |
Total Assets | 29.7 | 42.1
Total Liabilities | 12.6 | 5.6
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 17.1 | 36.5
I&M | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 28.5 | 30.1
I&M | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.2 | 12.0
I&M | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 10.5 | 5.4
I&M | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 2.1 | 0.2
OPCo |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Total Liabilities | 47.7 | 50.8
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | (47.7) | (50.8)
OPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
OPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
OPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 7.5 | 6.9
OPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 40.2 | 43.9
PSO |  |
Derivative [Line Items] |  |
Total Assets | 23.9 | 19.7
Total Liabilities | 7.8 | 30.7
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 16.1 | (11.0)
PSO | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 22.3 | 19.7
PSO | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.6 | 0.0
PSO | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 7.6 | 29.7
PSO | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.2 | 1.0
SWEPCo |  |
Derivative [Line Items] |  |
Total Assets | 19.1 | 12.5
Total Liabilities | 3.4 | 16.6
Total MTM Derivative Contract Net Assets (Liabilities) Recognized | 15.7 | (4.1)
SWEPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 19.1 | 12.0
SWEPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.5
SWEPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 3.4 | 14.9
SWEPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 1.7
Commodity | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 425.0 | 555.1
Commodity | Not Designated as Hedging Instrument | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 475.4 | 468.8
Commodity | Not Designated as Hedging Instrument | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 304.1 | 588.0
Commodity | Not Designated as Hedging Instrument | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 390.7 | 377.6
Commodity | Not Designated as Hedging Instrument | AEP Texas | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Not Designated as Hedging Instrument | AEP Texas | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Not Designated as Hedging Instrument | AEP Texas | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.3 | 0.2
Commodity | Not Designated as Hedging Instrument | AEP Texas | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Not Designated as Hedging Instrument | APCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 40.2 | 24.6
Commodity | Not Designated as Hedging Instrument | APCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 2.0 | 0.3
Commodity | Not Designated as Hedging Instrument | APCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 6.6 | 18.5
Commodity | Not Designated as Hedging Instrument | APCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.8 | 6.9
Commodity | Not Designated as Hedging Instrument | I&M | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 28.5 | 30.1
Commodity | Not Designated as Hedging Instrument | I&M | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.2 | 12.0
Commodity | Not Designated as Hedging Instrument | I&M | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 10.5 | 5.4
Commodity | Not Designated as Hedging Instrument | I&M | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 2.1 | 0.2
Commodity | Not Designated as Hedging Instrument | OPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Not Designated as Hedging Instrument | OPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Not Designated as Hedging Instrument | OPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 7.5 | 6.9
Commodity | Not Designated as Hedging Instrument | OPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 40.2 | 43.9
Commodity | Not Designated as Hedging Instrument | PSO | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 22.3 | 19.7
Commodity | Not Designated as Hedging Instrument | PSO | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 1.6 | 0.0
Commodity | Not Designated as Hedging Instrument | PSO | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 7.6 | 29.7
Commodity | Not Designated as Hedging Instrument | PSO | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.2 | 1.0
Commodity | Not Designated as Hedging Instrument | SWEPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 19.1 | 12.0
Commodity | Not Designated as Hedging Instrument | SWEPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.5
Commodity | Not Designated as Hedging Instrument | SWEPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 3.4 | 14.9
Commodity | Not Designated as Hedging Instrument | SWEPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 1.7
Commodity | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 54.1 | 56.7
Commodity | Designated as Hedging Instrument | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 84.6 | 86.8
Commodity | Designated as Hedging Instrument | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 11.3 | 8.2
Commodity | Designated as Hedging Instrument | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 2.7 | 2.2
Commodity | Designated as Hedging Instrument | AEP Texas | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | AEP Texas | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | APCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | APCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | APCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | APCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | I&M | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | I&M | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | I&M | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | I&M | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | OPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | OPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | OPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | OPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | PSO | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | PSO | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | PSO | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | PSO | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Commodity | Designated as Hedging Instrument | SWEPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 36.3 | 50.5
Interest Rate (USD) | Designated as Hedging Instrument | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 35.3 | 56.9
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 2.7
Interest Rate (USD) | Designated as Hedging Instrument | AEP Texas | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | APCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | I&M | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | OPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | PSO | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Prepaid Expenses and Other Current Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Other Noncurrent Assets |  |
Derivative [Line Items] |  |
Total Assets | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Other Current Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | 0.0 | 0.0
Interest Rate (USD) | Designated as Hedging Instrument | SWEPCo | Other Noncurrent Liabilities |  |
Derivative [Line Items] |  |
Total Liabilities | $ 0.0 | $ 0.0

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