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EFFECTS OF REGULATION - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 31, 2025 | Nov. 30, 2024 | Jun. 30, 2024 | Apr. 30, 2024 | Feb. 29, 2024 | Sep. 30, 2023 | Aug. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2024 | Jun. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance amount |  |  |  |  |  |  |  |  |  |  | $ 142.5 | $ 85.6 | $ 48.8 |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance amount |  |  |  |  |  |  |  |  |  |  | 0.0 | $ 85.6 | $ 0.0 |
Disallowance of fuel costs |  |  | $ 535.0 |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Subsequent Event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of fuel costs | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Subsequent Event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of fuel costs | 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Power Station | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.0
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Power Station | Arkansas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance amount |  |  |  |  |  |  |  |  |  | $ 2.0 |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Power Station | Louisiana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance amount |  |  |  |  |  |  |  |  | $ 14.0 |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pirkey Station | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  |  |  |  |  | 69.0 |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Generating Station and Related Fuel Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fuel supply provided |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Net investment |  |  |  |  |  |  |  |  |  |  | 74.0 |  |  |
Net under-recovered fuel costs |  |  |  |  |  |  |  |  |  |  | 22.0 |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Generating Station and Related Fuel Operations | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of fuel costs |  |  |  |  |  | $ 48.0 |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Generating Station and Related Fuel Operations | Arkansas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of fuel costs |  |  |  |  |  |  |  | $ 20.0 |  |  |  |  |  |
Recovery of fuel costs, period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Generating Station and Related Fuel Operations | Louisiana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of fuel costs |  |  |  |  |  |  |  | $ 20.0 |  |  |  |  |  |
Recovery of fuel costs, deferred |  |  |  |  |  |  |  | $ 35.0 |  |  |  |  |  |
Fuel disallowance |  |  |  |  |  |  | $ 55.0 |  |  |  |  |  |  |
Fuel disallowance, deferral |  |  |  |  |  |  | $ 35.0 |  |  |  |  |  |  |
Refund to customer period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Refund to customer, proposed |  |  |  |  | $ 55.0 |  |  |  |  |  |  |  |  |
Deferral, denial of recovery |  |  |  |  | $ 35.0 |  |  |  |  |  |  |  |  |
Disallowance of fuel costs |  |  |  | $ 11.0 |  |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  |  |  |  |  |  | $ 24.0 |  |  |
Regulatory asset, recovery period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pirkey Power Plant and Related Fuel Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment |  |  |  |  |  |  |  |  |  |  | $ 188.0 |  |  |
Net under-recovered fuel costs |  |  |  |  |  |  |  |  |  |  | $ 22.0 |  |  |
Fuel disallowance |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pirkey Power Plant and Related Fuel Operations | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of fuel costs |  |  |  |  |  | $ 33.0 |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pirkey Power Plant and Related Fuel Operations | Texas | Subsequent Event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel disallowance | 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Pirkey Power Plant and Related Fuel Operations | Texas | Subsequent Event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel disallowance | $ 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |

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