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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 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 March 31,2024202320242023
 (In millions)
Service costs $35 $34 $$
Interest costs 99 109 
Expected return on plan assets(133)(128)(8)(8)
Amortization of prior service costs (credits)(1)
— (1)(2)
Net periodic benefit costs (credits)$$15 $(3)$(4)
Net periodic benefit costs (credits), net of amounts capitalized $(15)$(3)$(4)$(4)
(1) The income tax benefits associated with pension and OPEB prior service costs amortized out of AOCI were $1 million for the three months ended March 31, 2023.