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DISCONTINUED OPERATIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 27, 2020
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Worthless stock deduction $ 4,900 $ 5,200    
Unrecognized tax benefits from worthless stock deduction 316      
Worthless stock deduction, net of tax   1,100    
Increase in NOL allocation     $ 289  
Increase in NOL allocation tax effected     $ 61  
Revision of Prior Period, Adjustment        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deferred tax assets, valuation allowance       $ 21
State and Local        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Worthless stock deduction, net of tax   $ 21    
FES Key Creditor Groups | Affiliated companies | FES        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Settlement of claims upon emergence 853      
IT Access Agreement | Affiliated companies | FES        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Amount paid to settle claims $ 125