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SEGMENT INFORMATION - Narrative (Details)
mi² in Thousands, customer in Millions, $ in Millions
9 Months Ended
May 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
mi²
company
customer
MW
Apr. 27, 2023
USD ($)
Feb. 02, 2023
USD ($)
North American Transmission Company II LLC | FET        
Segment Reporting Information [Line Items]        
Sale of ownership interest by parent     30.00% 30.00%
Noncontrolling interest, ownership percentage by noncontrolling owners       49.90%
FEV | Global Holding        
Segment Reporting Information [Line Items]        
Investment ownership percentage   33.30%    
FET | North American Transmission Company II LLC        
Segment Reporting Information [Line Items]        
Sale of ownership interest by parent 19.90%      
Sale price of ownership interest by parent $ 2,375      
Disposal group, including discontinued operation, consideration     $ 3,500 $ 3,500
FE | FET        
Segment Reporting Information [Line Items]        
Equity method investment, ownership percentage       50.10%
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    
Number of square miles in service area | mi²   65    
Megawatts of net demonstrated capacity of competitive segment | MW   3,580    
Other/Corporate | OVEC        
Segment Reporting Information [Line Items]        
Megawatts of net demonstrated capacity of competitive segment | MW   67    
Other/Corporate | FE        
Segment Reporting Information [Line Items]        
Long-term debt and other long-term obligations   $ 6,800