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SEGMENT INFORMATION - Narrative (Details)
mi² in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Feb. 02, 2023
USD ($)
May 31, 2022
USD ($)
Mar. 05, 2021
USD ($)
Apr. 06, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
mi²
company
customer
MW
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]                
Gain on sale of property           $ 0 $ 109 $ 0
DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag         TMI-2 to TMI-2 Solutions      
Brookfield II | FET | Subsequent Event                
Segment Reporting Information [Line Items]                
Sale of ownership interest by parent 30.00%              
Noncontrolling interest ownership percentage 49.90%              
FET | Brookfield II                
Segment Reporting Information [Line Items]                
Sale of ownership interest by parent   19.90%            
Sale of ownership interest by parent   $ 2,375            
FET | Brookfield II | Subsequent Event                
Segment Reporting Information [Line Items]                
Consideration $ 3,500              
Liabilities incurred $ 1,750              
JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility | NJBPU                
Segment Reporting Information [Line Items]                
Disposal group, including discontinued operation, ownership interest sold       50.00%        
Regulated Distribution                
Segment Reporting Information [Line Items]                
Number of existing utility operating companies | company           10    
Number of customers served by utility operating companies | customer           6,000,000    
Number of square miles in service area | mi²           65    
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW           3,580    
Regulated Distribution | Disposal Group, Disposed of by Sale | TMI-2                
Segment Reporting Information [Line Items]                
Gain on disposal of discontinued operation, net of tax         $ 33      
Regulated Distribution | JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility                
Segment Reporting Information [Line Items]                
Gain on sale of property     $ 109          
Other/Corporate | OVEC                
Segment Reporting Information [Line Items]                
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW           67    
FE | Subsequent Event | FET                
Segment Reporting Information [Line Items]                
Ownership interest 50.10%              
FE | Other/Corporate                
Segment Reporting Information [Line Items]                
Long-term debt and other long-term obligations           $ 5,400