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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
The components of FirstEnergy’s net periodic benefit costs (credits) for pension and OPEB were as follows:
FirstEnergy Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Three Months Ended June 30, 2025202420252024
 (In millions)
Service costs $32 $35 $— $— 
Interest costs 94 100 5 5 
Expected return on plan assets(115)(132)(9)(9)
Amortization of prior service costs (credits)— — — — 
Net periodic benefit costs (credits)$11 $3 $(4)$(4)
Net periodic benefit credits, net of amounts capitalized $(7)$(15)$(5)$(3)
Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Six Months Ended June 30, 2025202420252024
 (In millions)
Service costs$65 $70 $1 $1 
Interest costs187 199 10 10 
Expected return on plan assets(230)(265)(19)(17)
Amortization of prior service costs (credit)— 1 — (1)
Net periodic benefit costs (credits)22 5 (8)(7)
Net periodic benefit costs (credits), net of amounts capitalized$(13)$(30)$(9)$(7)
JCP&L’s net periodic benefit costs (credits) for pension and OPEB were as follows:
PensionOPEB
(In millions)2025202420252024
For the Three Months Ended June 30,
JCP&L's share of net periodic benefit credits (1)
$(1)$(1)$(3)$(3)
Allocated net periodic benefit costs from affiliates (1) (2)
$3 $2 $— $— 
For the Six Months Ended June 30,
JCP&L's share of net periodic benefit credits(1)
$(2)$(2)$(7)$(6)
Allocated net periodic benefit costs from affiliates(1) (2)
$5 $4 $— $— 
(1) Includes amounts capitalized
(2) In addition to the net periodic benefit costs for its current and former employees and retirees, JCP&L is also allocated pension and OPEB net periodic benefit costs and credits from its affiliates, primarily FESC.