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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Narrative (Details)
employee in Thousands, $ in Millions
 1 Months Ended 9 Months Ended
Jan. 31, 2025
USD ($)
employee
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employee benefit plan funding and related payments   $ 38 $ 44
JERSEY CENTRAL POWER & LIGHT COMPANY      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employee benefit plan funding and related payments   $ 0 $ 7
Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate   8.50%  
Expected future contributions   $ 300  
Pension | MetLife      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Transfer of plan assets $ 640    
Transfer of benefit obligations $ 652    
Defined benefit plan, number of covered employees by plan | employee 2    
Pension | JERSEY CENTRAL POWER & LIGHT COMPANY      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected future contributions   $ 0