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Retirement Plans and Other Retiree Benefits
 6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020 were as follows:
Three Months Ended June 30,
 Pension BenefitsOther Retiree Benefits
 United StatesInternational  
 202120202021202020212020
Service cost$1 $— $4 $3 $7 $5 
Interest cost15 18 4 4 9 8 
Expected return on plan assets(26)(27)(4)(5)— (1)
Amortization of actuarial loss (gain)10 13 3 4 7 6 
Net periodic benefit cost
$— $4 $7 $6 $23 $18 


Six Months Ended June 30,
 Pension BenefitsOther Retiree Benefits
 United StatesInternational  
 202120202021202020212020
Service cost$1 $— $8 $7 $13 $11 
Interest cost30 37 9 9 18 19 
Expected return on plan assets(53)(54)(10)(9)— (1)
Amortization of actuarial loss (gain)23 24 6 5 13 11 
Net periodic benefit cost
$1 $7 $13 $12 $44 $40 
For the six months ended June 30, 2021 and 2020, the Company made no voluntary contributions to its U.S. postretirement plans.