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DISCONTINUED OPERATIONS - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income tax benefit |  | $ (21) |  | $ (48)
Income from discontinued operations | [1] | (21) | $ 0 | 44
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Other expense, net |  | 0 | 0 | (4)
Loss from discontinued operations, before tax |  | 0 | 0 | (4)
Income tax benefit |  | 0 | 0 | (1)
Loss from discontinued operations, net of tax |  | 0 | 0 | (3)
Income tax expense (benefit), including worthless stock deduction |  | 21 | 0 | (47)
Gain (loss) on disposal, net of tax |  | (21) | 0 | 47
Income from discontinued operations |  | $ (21) | $ 0 | $ 44
[1] | Net of income tax benefit (expense) of ($21 million) and $48 million in 2023 and 2021, respectively.

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