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TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2022
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes |  |  |  |  |  |
Income from continuing operations, before income taxes |  |  | $ 1,464 | $ 1,439 | $ 1,559 |
Federal income tax expense at the 21% statutory rate |  |  | 307 | 302 | 327 |
Increases (reductions) in taxes resulting from- |  |  |  |  |  |
State and municipal income taxes, net of federal tax benefit |  |  | 80 | 56 | 122 |
AFUDC equity and other flow-through |  |  | (30) | (26) | (29) |
Amortization of investment tax credits |  |  | (3) | (4) | (4) |
Deferred gain on 19.9% FET minority interest sale |  |  | 58 | 752 | 0 |
Federal tax credits claimed |  |  | (3) | (3) | (34) |
Nondeductible DPA monetary penalty |  |  | 0 | 0 | 52 |
Excess deferred tax amortization due to the Tax Act |  |  | (46) | (51) | (54) |
Uncertain tax positions |  |  | 41 | 2 | (82) |
Valuation allowances | $ 37 |  | (146) | (47) | 17 |
Other, net |  |  | 9 | 19 | 5 |
Total income taxes on income from continuing operations |  | $ 65 | $ 267 | $ 1,000 | $ 320 |
Effective income tax rate (percent) |  |  | 18.20% | 69.50% | 20.50% |
Brookfield II | FET |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |
Sale of ownership interest by parent | 19.90% |  | 19.90% |  |  | 19.90%

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