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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Information about net periodic benefit cost for our company-sponsored pension and postretirement benefit plans is as follows for the three months ended March 31, 2020 and 2019 (in millions):
 U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202020192020201920202019
Three Months Ended March 31:
Service cost$464  $359  $ $ $16  $14  
Interest cost494  517  23  27  10  12  
Expected return on assets(888) (782) (2) (2) (21) (19) 
Amortization of prior service cost55  54    —  —  
Net periodic benefit cost$125  $148  $30  $33  $ $