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TAXES - Accumulated Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Mar. 31, 2024 | Mar. 25, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2022
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Income Tax Disclosure [Abstract] |  |  |  |  |  |
Property basis differences | $ 6,079 |  |  | $ 5,787 |  |
Pension and OPEB | (322) |  |  | (331) |  |
Regulatory asset/liability | 744 |  |  | 647 |  |
Deferred compensation | (127) |  |  | (153) |  |
Deferred gain on 19.9% FET equity interest sale | 0 |  |  | 810 |  |
Loss carryforwards and tax credits | (762) |  |  | (2,192) |  |
Valuation allowances | 240 |  |  | 226 |  |
Other | (239) |  |  | (264) |  |
Net accumulated deferred income tax liability | $ 5,613 | $ 46 |  | $ 4,530 |  |
Brookfield II | FET |  |  |  |  |  |
Provision for Income Tax [Line Items] |  |  |  |  |  |
Sale of ownership interest by parent | 19.90% | 19.90% | 49.90% |  | 19.90% | 19.90%

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