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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2021 and 2020 is as follows (in millions):
 U.S. Pension BenefitsU.S. Postretirement
Medical Benefits		International
Pension Benefits
202120202021202020212020
Three Months Ended September 30:
Service cost$442 $463 $7 $7 $19 $17 
Interest cost490 495 21 23 9 10 
Expected return on assets(825)(887)(1)(2)(17)(22)
Amortization of prior service cost36 55 2 1 — — 
Net periodic benefit cost$143 $126 $29 $29 $11 $5 
U.S. Pension BenefitsU.S. Postretirement
Medical Benefits		International
Pension Benefits
202120202021202020212020
Nine Months Ended September 30:
Service cost$1,456 $1,390 $21 $22 $57 $50 
Interest cost1,459 1,483 60 68 29 30 
Expected return on assets(2,502)(2,662)(4)(6)(51)(64)
Amortization of prior service cost103 164 5 5 1 1 
Actuarial (gain) loss(3,290)— — — — — 
Net periodic benefit (income) cost$(2,774)$375 $82 $89 $36 $17