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Pension and Other Post-Employment Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The components of the consolidated net periodic costs (credits) for pension and OPEB were as follows:
Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Three Months Ended March 31,2021202020212020
 (In millions)
Service costs $49 $52 $$
Interest costs 56 75 
Expected return on plan assets(163)(153)(10)(8)
Amortization of prior service costs (credits)(1) (2)
10 (4)(33)
One-time termination benefit (3)
— — — 
Pension and OPEB mark-to-market adjustment — 386 — 37 
Net periodic costs (credits), including amounts capitalized$(57)$378 $(10)$
Net periodic costs (credits), recognized in earnings$(78)$358 $(10)$
(1) 2020 includes the acceleration of $18 million in net credits as a result of the FES Debtors’ emergence during the first quarter of 2020 and is a component of discontinued operations in FirstEnergy’s Consolidated Statements of Income.
(2) The income tax benefits associated with pension and OPEB prior service costs amortized out of AOCI were $1 million and $5 million as of March 31, 2021 and 2020, respectively.
(3) Costs represent additional benefits provided to FES and FENOC employees under the approved settlement agreement and are a component of discontinued operations in FirstEnergy’s Consolidated Statements of Income.