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TRANSACTIONS WITH AFFILIATES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Related Party Transaction [Line Items]        
Total revenues [1] $ 3,380 $ 3,280 $ 7,145 $ 6,567
Other operating expenses 995 1,170 2,029 2,176
Interest expense 299 285 587 590
JERSEY CENTRAL POWER & LIGHT COMPANY        
Related Party Transaction [Line Items]        
Total revenues 592 557 1,158 1,023
Other operating expenses [2] 133 158 278 345
Related Party | JERSEY CENTRAL POWER & LIGHT COMPANY        
Related Party Transaction [Line Items]        
Total revenues 1 1 1 1
Other operating expenses 26 28 59 57
Interest expense 2 6 3 10
Operating expenses capitalized 17 17 38 35
FESC support services | Related Party | JERSEY CENTRAL POWER & LIGHT COMPANY        
Related Party Transaction [Line Items]        
Other operating expenses 42 41 92 84
Other affiliate support services | Related Party | JERSEY CENTRAL POWER & LIGHT COMPANY        
Related Party Transaction [Line Items]        
Other operating expenses $ 1 $ 4 $ 5 $ 8
[1] Includes excise and gross receipts tax collections of $100 million and $98 million during the three months ended June 30, 2025 and 2024, respectively, and $223 million and $213 million during the six months ended June 30, 2025 and 2024, respectively.
[2] Includes affiliated operating expenses of $26 million and $28 million for the three months ended June 30, 2025 and 2024, respectively, and $59 million and $57 million for the six months ended June 30, 2025 and 2024, respectively.