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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 33 $ 35 $ 98 $ 105
Interest costs 93 99 280 298
Expected return on plan assets (115) (132) (345) (397)
Amortization of prior service costs (credits) 1 0 1 1
Net periodic benefit costs (credits) 12 2 34 7
Net periodic benefit credits, net of amounts capitalized (6) (15) (19) (45)
Pension | JERSEY CENTRAL POWER & LIGHT COMPANY        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit costs (credits) (1) (1) (3) (4)
Allocated net periodic benefit costs from affiliates 2 2 7 6
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs 1 1 2 2
Interest costs 5 5 15 15
Expected return on plan assets (9) (9) (28) (26)
Amortization of prior service costs (credits) (1) 0 (1) (1)
Net periodic benefit costs (credits) (4) (3) (12) (10)
Net periodic benefit credits, net of amounts capitalized (4) (4) (13) (11)
OPEB | JERSEY CENTRAL POWER & LIGHT COMPANY        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit costs (credits) (4) (3) (11) (10)
Allocated net periodic benefit costs from affiliates $ 0 $ 0 $ 0 $ 0