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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income from discontinued operations | [1] | $ 0 | $ 44 | $ 76
Gain on disposal, net of tax |  | $ 0 | $ (47) | $ (76)
DisposalGroupNotDiscontinuedOperationGainLossOnDisposalStatementOfIncomeExtensibleListNotDisclosedFlag |  | Gain on disposal, net of tax | Gain on disposal, net of tax | Gain on disposal, net of tax
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income from discontinued operations |  | $ 0 | $ 44 | $ 76
Gain on disposal, net of tax |  | $ 0 | $ (47) | $ (76)
[1] | Net of income tax benefit of $48 million and $59 million in 2021 and 2020, respectively.

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