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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Service costs | $ 33 | $ 35
Interest costs | 93 | 99
Expected return on plan assets | (115) | (133)
Amortization of prior service costs (credits) | 0 | 1
Net periodic benefit costs (credits) | 11 | 2
Net periodic benefit credits, net of amounts capitalized | (6) | (15)
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)
OPEB |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Service costs | 1 | 1
Interest costs | 5 | 5
Expected return on plan assets | (10) | (8)
Amortization of prior service costs (credits) | 0 | (1)
Net periodic benefit costs (credits) | (4) | (3)
Net periodic benefit credits, net of amounts capitalized | (4) | (4)
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)

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