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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2024
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:
Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Three Months Ended June 30,2024202320242023
 (In millions)
Service costs $35 $35 $— $— 
Interest costs 100 107 5 6 
Expected return on plan assets(132)(142)(9)(8)
Amortization of prior service costs (credits)— 1 — (2)
Special termination benefits(1)
— 5 — 2 
Pension and OPEB mark-to-market adjustment — (59)— — 
Net periodic benefit costs (credits)$3 $(53)$(4)$(2)
Net periodic benefit costs (credits), net of amounts capitalized $(15)$(70)$(3)$(3)
(1) Related to benefits provided in connection with the PEER program.
Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Six Months Ended June 30, 2024202320242023
 (In millions)
Service cost70 69 1 1 
Interest cost199 216 10 11 
Expected return on plan assets(265)(270)(17)(16)
Amortization of prior service cost (credit)(1)
1 1 (1)(4)
Special termination benefits(2)
— 5 — 2 
Pensions & OPEB mark-to-market adjustment— (59)— — 
Net periodic cost (credits)5 (38)(7)(6)
Net periodic benefit costs (credits), net of amounts capitalized$(30)$(73)$(7)$(7)
(1) The income tax benefits associated with the pension and OPEB prior service costs amortized out of AOCI were $1 million for the six months ended June 30, 2023. Amounts were immaterial for the six months ended June 30, 2024.
(2) Related to benefits provided in connection with the PEER program.