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Retirement Plans and Other Retiree Benefits
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2021 and 2020 were as follows:
Three Months Ended September 30,
 Pension BenefitsOther Retiree Benefits
 United StatesInternational  
 202120202021202020212020
Service cost$— $— $3 $4 $7 $3 
Interest cost16 20 5 5 8 10 
Expected return on plan assets(27)(29)(4)(6)— — 
Amortization of actuarial loss (gain)11 10 2 2 5 3 
Net periodic benefit cost
$— $1 $6 $5 $20 $16 


Nine Months Ended September 30,
 Pension BenefitsOther Retiree Benefits
 United StatesInternational  
 202120202021202020212020
Service cost$1 $— $11 $11 $20 $14 
Interest cost46 57 14 14 26 29 
Expected return on plan assets(81)(83)(14)(15)— (1)
Amortization of actuarial loss (gain)35 34 8 7 18 14 
Net periodic benefit cost
$1 $8 $19 $17 $64 $56 
For the nine months ended September 30, 2021 and 2020, the Company made no voluntary contributions to its U.S. postretirement plans.