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SEGMENT INFORMATION - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
customer
meter
MW
Mar. 31, 2023
USD ($)
Dec. 31, 2025
site
MW
Jan. 08, 2024
MW
Segment Reporting Information [Line Items]        
Number of customers served by utility operating companies | customer 6,000,000      
Total revenues | $ [1] $ 3,287 $ 3,231    
FEV | Global Holding        
Segment Reporting Information [Line Items]        
Investment ownership percentage 33.30%      
Distribution        
Segment Reporting Information [Line Items]        
Number of customers served by utility operating companies | customer 4,200,000      
Megawatts of net demonstrated capacity of competitive segment | MW 3,599      
Distribution | Rate Base 2023        
Segment Reporting Information [Line Items]        
Total revenues | $ $ 10,900      
Integrated        
Segment Reporting Information [Line Items]        
Number of customers served by utility operating companies | customer 2,000,000      
Integrated | Rate Base 2023        
Segment Reporting Information [Line Items]        
Total revenues | $ $ 8,700      
Integrated | MP and PE | Solar Generation Project        
Segment Reporting Information [Line Items]        
Plant capacity (in MW's) | MW 50      
Number of approved solar sites | meter 5      
Integrated | MP and PE | Solar Generation Project | Forecast        
Segment Reporting Information [Line Items]        
Plant capacity (in MW's) | MW     31  
Number of sites expected to be completed | site     4  
Integrated | MP and PE | Solar Generation Project | West Virginia        
Segment Reporting Information [Line Items]        
Megawatts of net demonstrated capacity of competitive segment | MW       19
Regulated Transmission | Rate Base 2023        
Segment Reporting Information [Line Items]        
Total revenues | $ $ 7,700      
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 | $ $ 6,500      
[1] Includes excise and gross receipts tax collections of $115 million and $109 million during the three months ended March 31, 2024 and 2023, respectively.