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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Information about the net periodic benefit (income) cost for our company-sponsored pension and postretirement benefit plans for the three months ended March 31, 2021 and 2020 is as follows (in millions):
 U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202120202021202020212020
Three Months Ended March 31:
Service cost$553 $464 $$$19 $16 
Interest cost488 494 19 23 10 10 
Expected return on assets(846)(888)(2)(2)(17)(21)
Amortization of prior service cost33 55 — — 
Actuarial (gain) loss(3,290)— — — — — 
Net periodic benefit (income) cost$(3,062)$125 $26 $30 $12 $