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TRANSACTIONS WITH AFFILIATES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Revenues [1] $ 4,148 $ 3,729 $ 11,293 $ 10,296
Other operating expenses 976 1,099 3,005 3,275
Interest expense 312 276 899 866
JERSEY CENTRAL POWER & LIGHT COMPANY        
Related Party Transaction [Line Items]        
Revenues 864 765 2,022 1,788
Other operating expenses [2] 158 179 436 524
JERSEY CENTRAL POWER & LIGHT COMPANY | Related Party        
Related Party Transaction [Line Items]        
Revenues 0 0 1 1
Other operating expenses 27 39 86 96
Interest income 1 0 1 0
Interest expense 3 5 6 15
Operating expenses capitalized 19 17 57 52
JERSEY CENTRAL POWER & LIGHT COMPANY | FESC support services | Related Party        
Related Party Transaction [Line Items]        
Other operating expenses 43 42 135 126
JERSEY CENTRAL POWER & LIGHT COMPANY | Other affiliate support services | Related Party        
Related Party Transaction [Line Items]        
Other operating expenses $ 3 $ 14 $ 8 $ 22
[1] Includes excise and gross receipts tax collections of $126 million and $116 million during the three months ended September 30, 2025 and 2024, respectively, and $349 million and $329 million during the nine months ended September 30, 2025 and 2024, respectively.
[2] Includes affiliated operating expenses of $27 million and $39 million for the three months ended September 30, 2025 and 2024, respectively, and $86 million and $96 million for the nine months ended September 30, 2025 and 2024, respectively.