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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2021 and 2020 is as follows (in millions):
 U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202120202021202020212020
Three Months Ended June 30:
Service cost$461 $463 $$$19 $17 
Interest cost481 494 20 22 10 10 
Expected return on assets(831)(887)(1)(2)(17)(21)
Amortization of prior service cost34 54 
Net periodic benefit cost$145 $124 $27 $30 $13 $
U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202120202021202020212020
Six Months Ended June 30:
Service cost$1,014 $927 $14 $15 $38 $33 
Interest cost969 988 39 45 20 20 
Expected return on assets(1,677)(1,775)(3)(4)(34)(42)
Amortization of prior service cost67 109 
Actuarial (gain) loss(3,290)— — — — — 
Net periodic benefit (income) cost$(2,917)$249 $53 $60 $25 $12