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SEGMENT INFORMATION - Narrative (Details)
mi² in Thousands, $ in Millions
12 Months Ended
Feb. 02, 2023
USD ($)
Dec. 31, 2023
USD ($)
mi²
customer
MW
Jan. 01, 2024
Apr. 27, 2023
USD ($)
May 31, 2022
FET          
Segment Reporting Information [Line Items]          
Noncontrolling interest ownership percentage 49.90% 19.90%      
Brookfield II | FET          
Segment Reporting Information [Line Items]          
Sale of ownership interest by parent 30.00%     30.00%  
Noncontrolling interest ownership percentage 49.90%        
FE | FET          
Segment Reporting Information [Line Items]          
Equity method investment, ownership percentage 50.10%        
FET | Brookfield II          
Segment Reporting Information [Line Items]          
Sale of ownership interest by parent   19.90%     19.90%
Consideration $ 3,500     $ 3,500  
Liabilities incurred $ 1,750        
FEV | Global Holding          
Segment Reporting Information [Line Items]          
Investment ownership percentage   33.33%      
FEV | Global Holding | Subsequent Event          
Segment Reporting Information [Line Items]          
Investment ownership percentage     33.33%    
Utilities and Transmission Companies          
Segment Reporting Information [Line Items]          
Number of customers | customer   6,000,000      
Service Area | mi²   65      
Plant generation capacity (in MW's) | MW   3,580      
Other Business Operations [Member] | FE          
Segment Reporting Information [Line Items]          
Long-term debt and other long-term obligations   $ 7,100      
Other Business Operations [Member] | OVEC          
Segment Reporting Information [Line Items]          
Plant generation capacity (in MW's) | MW   67