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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 32 $ 35 $ 65 $ 70
Interest costs 94 100 187 199
Expected return on plan assets (115) (132) (230) (265)
Amortization of prior service costs (credits) 0 0 0 1
Net periodic benefit costs (credits) 11 3 22 5
Net periodic benefit credits, net of amounts capitalized (7) (15) (13) (30)
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) (2) (2)
Allocated net periodic benefit costs from affiliates 3 2 5 4
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs 0 0 1 1
Interest costs 5 5 10 10
Expected return on plan assets (9) (9) (19) (17)
Amortization of prior service costs (credits) 0 0 0 (1)
Net periodic benefit costs (credits) (4) (4) (8) (7)
Net periodic benefit credits, net of amounts capitalized (5) (3) (9) (7)
OPEB | JERSEY CENTRAL POWER & LIGHT COMPANY        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit costs (credits) (3) (3) (7) (6)
Allocated net periodic benefit costs from affiliates $ 0 $ 0 $ 0 $ 0