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TAXES - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 08, 2022 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2024 | May 31, 2022
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards, subject to expiration |  | $ 7,100 | $ 7,100 |  |  |  |
Nondeductible DPA monetary penalty |  | 752 |  |  |  |  |
Valuation allowances |  |  | (47) | $ 17 | $ (49) |  |
Excess deferred tax amortization due to the Tax Act |  |  | (51) | (54) | (56) |  |
Income taxes (benefits) |  |  | 1,000 | $ 320 | $ 126 |  |
Operating loss carryforwards, subject to expiration, net of tax |  | 1,500 | 1,500 |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 5,000 | 5,000 |  |  |  |
Operating loss carryforwards, not subject to expiration, net of tax |  | 1,000 | 1,000 |  |  |  |
General business tax credits |  | 51 | 51 |  |  |  |
Unrecognized tax benefits that would impact future tax rates |  | 41 | 41 |  |  |  |
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year |  | 25 | 25 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 24 | 24 |  |  |  |
State and Local |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Valuation allowances |  | 54 |  |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 12,600 | 12,600 |  |  |  |
Operating loss carryforwards, not subject to expiration, net of tax |  | 568 | 568 |  |  |  |
Pre-tax net operating loss carryforwards expected to utilized |  | 3,900 | 3,900 |  |  |  |
Operating loss carryforwards expected to utilized, net of tax |  | $ 199 | 199 |  |  |  |
Tax Years 2018 and 2019 |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Valuation allowances |  |  | $ 38 |  |  |  |
Brookfield II | FET |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Sale of ownership interest by parent |  |  |  |  |  |  | 19.90%
Brookfield II | FET | Forecast |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Sale of ownership interest by parent |  |  |  |  |  | 30.00% |
Operating loss carryforwards, subject to expiration |  |  |  |  |  | $ 7,100 |
Equity interest rate of combined sale |  |  |  |  |  | 49.90% |
Consideration |  |  |  |  |  | $ 3,500 |
Pennsylvania |  |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |  |
Excess deferred tax amortization due to the Tax Act | $ 230 |  |  |  |  |  |
Increase (decrease) in regulatory liabilities | 236 |  |  |  |  |  |
Income taxes (benefits) | $ 6 |  |  |  |  |  |

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