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TAXES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2024 | Mar. 31, 2023 | Aug. 16, 2022 | May 31, 2022
Provision for Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances |  | $ 37 |  |  | $ (146) | $ (47) | $ 17 |  |  |  |
Operating loss carryforwards, not subject to expiration, net of tax |  | 1,200 |  |  | 1,200 |  |  |  |  | $ 1,000 |
Income taxes paid | $ 49 |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards, subject to expiration |  | 8,100 |  |  | 8,100 |  |  |  |  |  |
Nondeductible DPA monetary penalty |  | 58 |  | $ 752 |  |  |  |  |  |  |
Income taxes (benefits) |  |  | $ 65 |  | 267 | 1,000 | $ 320 |  |  |  |
Deferred tax assets |  | 4 |  |  | 4 |  |  |  | $ 9 |  |
Deferred tax assets, expected to be refunded to customers |  | 4 |  |  | 4 |  |  |  |  |  |
Operating loss carryforwards, subject to expiration, net of tax |  | 1,700 |  |  | 1,700 |  |  |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 5,900 |  |  | 5,900 |  |  |  |  |  |
Tax credit carryforwards not subject to expiration |  | 57 |  |  | 57 |  |  |  |  |  |
Tax credit carryforwards subject to expiration |  | 12 |  |  | 12 |  |  |  |  |  |
Interest expense reversed due to settlement |  | 9 |  |  | 9 |  |  |  |  |  |
Interest Expense Carryforward |  |  |  |  |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances |  |  |  |  |  | $ 38 |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards, not subject to expiration, net of tax |  | 436 |  |  | 436 |  |  |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 13,500 |  |  | 13,500 |  |  |  |  |  |
Pre-tax net operating loss carryforwards expected to utilized |  | 6,100 |  |  | 6,100 |  |  |  |  |  |
Operating loss carryforwards expected to utilized, net of tax |  | $ 233 |  |  | $ 233 |  |  |  |  |  |
Brookfield II | FET |  |  |  |  |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  | 19.90% |  |  | 19.90% |  |  |  |  |  | 19.90%
Brookfield II | Forecast | FET |  |  |  |  |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional sale of ownership interest by parent |  |  |  |  |  |  |  | 30.00% |  |  |
Sale of ownership interest by parent |  |  |  |  |  |  |  | 49.90% |  |  |
Operating loss carryforwards, subject to expiration |  |  |  |  |  |  |  | $ 7,500 |  |  |

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