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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net periodic (benefit) cost included in “General and administrative expenses” includes the following components:
 
 Three Months Ended March 31,
 Pension BenefitsOther Postretirement Benefits
 2021202020212020
 (in millions)
Components of net periodic (benefit) cost:
Service cost$83 $80 $$
Interest cost90 108 12 16 
Expected return on plan assets(205)(201)(25)(25)
Amortization of prior service cost(1)(1)
Amortization of actuarial (gain) loss, net62 65 
Settlements
Special termination benefits(1)
Net periodic (benefit) cost
$31 $53 $(1)$
__________ 
(1)For 2020 and 2021, certain employees were provided special termination benefits under non-qualified plans in the form of unreduced early retirement benefits as a result of their involuntary termination or participation in the Voluntary Separation Program that was offered to eligible U.S.-based employees in 2019.