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DISCONTINUED OPERATIONS - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax expense (benefit) $ (48) $ (59) $ (5)
Income from discontinued operations [1] 44 76 8
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]      
Revenues 0 7 188
Fuel 0 (6) (140)
Other operating expenses 0 (6) (63)
General taxes 0 0 (14)
Pleasants economic interest 0 5 27
Other expense, net (4) 0 (2)
Loss from discontinued operations, before tax (4) 0 (4)
Income tax expense (benefit) (1) 0 47
Loss from discontinued operations, net of tax (3) 0 (51)
Settlement consideration and services credit 0 (1) 7
Accelerated net pension and OPEB prior service credits 0 18 0
Gain on disposal of FES and FENOC, before tax 0 17 7
Income tax benefits, including worthless stock deduction (47) (59) (52)
Gain on disposal of FES and FENOC, net of tax 47 76 59
Income from discontinued operations $ 44 $ 76 $ 8
[1] Net of income tax benefit of $48 million, $59 million, and $5 million in 2021, 2020 and 2019, respectively.