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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Mar. 25, 2024
Effective Income Tax Rate Reconciliation [Line Items]            
Income before income taxes $ 610 $ 560 $ 1,556 $ 1,125    
Federal income tax expense at the 21% statutory rate 128 118 327 236    
Increases (reductions) in tax expense resulting from:            
State and municipal income taxes, net of federal tax benefit 34 33 90 76    
AFUDC equity and other flow-through (15) (6) (34) (19)    
Deductions associated with certain equity method investments 0 (14) 0 (14)    
Tax related to FE’s equity interest earnings from FET 4 4 12 13    
Excess deferred tax amortization (8) (13) (33) (40)    
Nondeductible SEC and OAG settlements 0 0 0 27    
Remeasurement of excess deferred income taxes (70) (21) (70) (21)    
Valuation allowances 0 (3) 0 33    
Other, net 5 (4) 0 3    
Total income taxes $ 78 $ 94 $ 292 $ 294    
Effective income tax rate 12.80% 16.80% 18.80% 26.10%    
FET | North American Transmission Company II LLC            
Increases (reductions) in tax expense resulting from:            
Sale of ownership interest by parent         19.90% 49.90%
JERSEY CENTRAL POWER & LIGHT COMPANY            
Effective Income Tax Rate Reconciliation [Line Items]            
Income before income taxes $ 160 $ 150 $ 313 $ 216    
Federal income tax expense at the 21% statutory rate 34 32 66 45    
Increases (reductions) in tax expense resulting from:            
State and municipal income taxes, net of federal tax benefit 11 11 22 15    
AFUDC equity and other flow-through (2) 0 (5) 0    
Excess deferred tax amortization (1) (1) (3) (4)    
Other, net (1) (1) (1) 2    
Total income taxes $ 41 $ 41 $ 79 $ 58    
Effective income tax rate 25.60% 27.30% 25.20% 26.90%