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DISCONTINUED OPERATIONS - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income (loss) from discontinued operations | [1] | $ (21) | $ 0 | $ 44
Disposal group not discontinued operation gain loss on disposal statement of income extensible list not disclosed flag |  | Loss (gain) on disposal, net of tax | Loss (gain) on disposal, net of tax | Loss (gain) on disposal, net of tax
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income (loss) from discontinued operations |  | $ (21) | $ 0 | $ 44
Loss (gain) on disposal, net of tax |  | $ 21 | $ 0 | $ (47)
[1] | Net of income tax benefit (expense) of ($21 million) and $48 million in 2023 and 2021, respectively.

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