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FINANCING ACTIVITIES - Schedule of Short-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Short-Term Debt [Line Items] |  |
Short-term – Securitized Debt of Receivables | $ 900.0 | $ 888.0
Interest Rate | 4.73% | 5.65%
Commercial Paper | $ 1,618.3 | $ 1,937.9
Total Short-term Debt | 2,523.8 | 2,830.2
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Notes Payable | 5.5 | 4.3
Total Short-term Debt | $ 5.5 | $ 4.3
Commercial Paper |  |
Short-Term Debt [Line Items] |  |
Weighted-Average Interest Rate | 4.70% | 5.69%
Notes Payable | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Weighted-Average Interest Rate | 6.69% | 7.71%

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