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Retirement Plans and Other Retiree Benefits
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Retirement Plans and Other Retiree Benefits Retirement Plans and Other Retiree Benefits
Components of Net periodic benefit cost for the three months ended March 31, 2021 and 2020 were as follows:
Three Months Ended March 31, 2021
 Pension BenefitsOther Retiree Benefits
 United StatesInternational  
 202120202021202020212020
Service cost$— $— $4 $4 $6 $6 
Interest cost15 19 5 5 9 11 
Expected return on plan assets(27)(27)(6)(4)— — 
Amortization of actuarial loss (gain)13 11 3 1 6 5 
Net periodic benefit cost
$1 $3 $6 $6 $21 $22 

For the three months ended March 31, 2021 and 2020, the Company made no voluntary contributions to its U.S. postretirement plans.