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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Information about the net periodic benefit cost for our company-sponsored pension and postretirement benefit plans for the three and six months ended June 30, 2020 and 2019 is as follows (in millions):
 U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202020192020201920202019
Three Months Ended June 30:
Service cost$463  $360  $ $ $17  $14  
Interest cost494  517  22  27  10  11  
Expected return on assets(887) (783) (2) (2) (21) (19) 
Amortization of prior service cost54  55      
Net periodic benefit cost$124  $149  $30  $32  $ $ 
U.S. Pension BenefitsU.S. Postretirement
Medical Benefits
International
Pension Benefits
202020192020201920202019
Six Months Ended June 30:
Service cost$927  $719  $15  $12  $33  $28  
Interest cost988  1,034  45  54  20  23  
Expected return on assets(1,775) (1,565) (4) (4) (42) (38) 
Amortization of prior service cost109  109      
Net periodic benefit cost$249  $297  $60  $65  $12  $14