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RATE MATTERS - SWEPCo Rate Matters (Details) - SWEPCo - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Jan. 31, 2022 | Oct. 31, 2020 | Dec. 31, 2021
2020 Texas Base Rate Case |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested annual increase |  |  | $ 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 increase | $ 114 |  |  |
Requested return on equity | 10.90% |  |  |
Requested debt capital structure | 52.30% |  |  |
Requested equity capital structure | 47.70% |  |  |

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