DISCONTINUED OPERATIONS - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions		12 Months Ended
		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.