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SEGMENT INFORMATION - Narrative (Details)
customer in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
MW
Jun. 30, 2024
USD ($)
MW
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
customer
site
MW
Jun. 30, 2023
USD ($)
Dec. 31, 2025
site
Jan. 08, 2024
MW
Segment Reporting Information [Line Items]              
Number of customers | customer       6.0      
Total revenues | $ [1]   $ 3,280 $ 3,006 $ 6,567 $ 6,237    
FEV | Global Holding              
Segment Reporting Information [Line Items]              
Investment ownership percentage   33.30%   33.30%      
Distribution Segment              
Segment Reporting Information [Line Items]              
Number of customers | customer       4.2      
Plant capacity (in MW's) | MW   3,599   3,599      
Distribution Segment | Rate Base 2023              
Segment Reporting Information [Line Items]              
Total revenues | $       $ 10,900      
Other Business Operations | FE              
Segment Reporting Information [Line Items]              
Long-term debt and other long-term obligations | $   $ 6,300   $ 6,300      
Other Business Operations | OVEC              
Segment Reporting Information [Line Items]              
Plant capacity (in MW's) | MW   67   67      
Integrated              
Segment Reporting Information [Line Items]              
Number of customers | customer       2.0      
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 | site       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]              
Plant capacity (in MW's) | MW             19
Regulated Transmission | Rate Base 2023              
Segment Reporting Information [Line Items]              
Total revenues | $       $ 7,700      
[1] Includes excise and gross receipts tax collections of $98 million and $92 million during the three months ended June 30, 2024 and 2023, respectively, and $213 million and $201 million during the six months ended June 30, 2024 and 2023, respectively.