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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Mar. 25, 2024
Effective Income Tax Rate Reconciliation [Line Items]            
Income before income taxes $ 406 $ 163 $ 946 $ 565    
Federal income tax expense at the 21% statutory rate 85 34 199 119    
Increases (reductions) in tax expense resulting from:            
State and municipal income taxes, net of federal tax benefit 25 21 56 43    
AFUDC equity and other flow-through (10) (8) (19) (16)    
Taxes related to the combined sale of 49.9% of the equity interests of FET 0 0 0 7    
Tax on distributions from FET 4 4 8 9    
Excess deferred tax amortization (13) (13) (25) (26)    
Nondeductible SEC and OAG settlements 0 27 0 27    
Valuation allowances 0 (3) 0 36    
Other, net (3) 3 (5) 1    
Total income taxes $ 88 $ 65 $ 214 $ 200    
Effective income tax rate 21.70% 39.90% 22.60% 35.40%    
JERSEY CENTRAL POWER & LIGHT COMPANY            
Effective Income Tax Rate Reconciliation [Line Items]            
Income before income taxes $ 88 $ 78 $ 153 $ 66    
Federal income tax expense at the 21% statutory rate 18 16 32 14    
Increases (reductions) in tax expense resulting from:            
State and municipal income taxes, net of federal tax benefit 6 6 11 5    
AFUDC equity and other flow-through (2) 0 (3) 0    
Excess deferred tax amortization (1) (1) (2) (3)    
Other, net 1 0 0 1    
Total income taxes $ 22 $ 21 $ 38 $ 17    
Effective income tax rate 25.00% 26.90% 24.80% 25.80%    
FET | North American Transmission Company II LLC            
Increases (reductions) in tax expense resulting from:            
Sale of ownership interest by parent         19.90% 49.90%