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Pension and Other Post-Employment Benefits (Tables)
9 Months Ended
Sep. 30, 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 September 30,2021202020212020
 (In millions)
Service costs $48 $47 $$
Interest costs 57 71 
Expected return on plan assets(163)(156)(10)(9)
Amortization of prior service costs (credits)(1)
(4)(4)
Net periodic credits, including amounts capitalized$(57)$(37)$(10)$(8)
Net periodic credits, recognized in earnings$(80)$(56)$(10)$(8)
(1) The income tax benefits associated with pension and OPEB prior service costs amortized out of AOCI were $1 million for both the three months ended September 30, 2021 and 2020, respectively.

Components of Net Periodic Benefit Costs (Credits)PensionOPEB
For the Nine Months Ended September 30,2021202020212020
 (In millions)
Service costs $145 $147 $$
Interest costs 170 216 12 
Expected return on plan assets(489)(464)(27)(25)
Amortization of prior service costs (credits)(1) (2)
12 (13)(42)
One-time termination benefit (3)
— — — 
Pension and OPEB mark-to-market adjustment — 386 — 37 
Net periodic costs (credits), including amounts capitalized$(171)$305 $(29)$(15)
Net periodic costs (credits), recognized in earnings$(243)$240 $(30)$(15)
(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 $3 million and $7 million for the nine months ended September 30, 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.