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RATE MATTERS - Pirkey Plant and Related Fuel Operations (Details) - Pirkey Power Plant and Related Fuel Operations - SWEPCo - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Apr. 30, 2025 | Jan. 31, 2025 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2025
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory asset, net investment |  |  |  |  | $ 204
Regulatory asset, net under-recovered fuel costs |  |  |  |  | $ 26
Texas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory asset, recovery of fuel costs |  |  | $ 535 |  |
Regulatory asset, fuel disallowance | $ 6 |  |  |  |
Texas | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory asset, fuel disallowance |  | $ 2 |  |  |
Texas | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory asset, fuel disallowance |  | $ 33 |  |  |
Texas | Sabine |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory asset, recovery of fuel costs |  |  |  | $ 33 |

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