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RATE MATTERS - SWEPCo Rate Matters (Details) - SWEPCo - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 29, 2025 | Aug. 31, 2025 | Mar. 31, 2025 | Jan. 31, 2022 | Oct. 31, 2020 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested return on equity |  | 9.50% |  |  |  |
Requested debt capital structure |  | 54.80% |  |  |  |
Requested equity capital structure |  | 45.20% |  |  |  |
Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested return on equity | 9.50% |  |  |  |  |
Requested debt capital structure | 54.80% |  |  |  |  |
Requested equity capital structure | 45.20% |  |  |  |  |
Pirkey Plant |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended recovery amount |  | $ 37 |  |  |  |
Public utilities, remaining net book recovery period |  | 20 years |  |  |  |
Pirkey Plant | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended recovery amount | $ 37 |  |  |  |  |
Public utilities, remaining net book recovery period | 20 years |  |  |  |  |
Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) |  | $ 53 |  |  |  |
Minimum | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) | $ 53 |  |  |  |  |
Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) |  | $ 99 |  |  |  |
Maximum | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) | 99 |  |  |  |  |
2020 Texas Base Rate Case |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) |  |  |  |  | $ 105 |
Requested return on equity |  |  |  |  | 10.35% |
Requested net annual increase |  |  |  |  | $ 90 |
Revised requested annual increase |  |  |  |  | 100 |
Revised requested net annual increase |  |  |  |  | $ 85 |
Approved annual revenue increase |  |  |  | $ 39 |  |
Approved return on equity |  |  |  | 9.25% |  |
Amount of approved increase related to vegetation management |  |  |  | $ 5 |  |
Amount of approved increase related to storm catastrophe reserve |  |  |  | $ 2 |  |
Impairment charge total |  |  |  |  |  | $ 12
2025 Arkansas Base Rate Case |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) |  |  | $ 114 |  |  |
Requested return on equity |  |  | 10.90% |  |  |
Requested debt capital structure |  |  | 52.30% |  |  |
Requested equity capital structure |  |  | 47.70% |  |  |
2025 Texas Base Rate Case | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual base rate increase (decrease) | $ 164 |  |  |  |  |
Requested return on equity | 10.75% |  |  |  |  |
Requested net annual increase | $ 95 |  |  |  |  |
Requested debt capital structure | 48.00% |  |  |  |  |
Requested equity capital structure | 52.00% |  |  |  |  |
2025 Texas Base Rate Case | Pirkey Plant | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory asset, requested to recovery amount | $ 21 |  |  |  |  |

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