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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Pension and OPEB (Income) Expense
Three Months Ended June 30, 2021Three Months Ended June 30, 2020
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$66 $32 $$63 $37 $
Interest cost268 61 31 429 88 44 
Expected return on plan assets(794)(158)— (817)(163)— 
Amortization of prior service cost (credit)(1)(1)(1)(2)
Amortization of net actuarial losses54 23 40 18 
Net periodic pension and OPEB (income) expense$(455)$(9)$58 $(322)$$64 

Six Months Ended June 30, 2021Six Months Ended June 30, 2020
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$131 $70 $$125 $66 $
Interest cost537 120 62 858 179 87 
Expected return on plan assets(1,589)(310)— (1,633)(333)— 
Amortization of prior service cost (credit)(2)(3)(2)(4)
Amortization of net actuarial losses13 108 48 82 37 
Net periodic pension and OPEB (income) expense$(910)$(9)$116 $(644)$(3)$129