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Pensions and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
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 $5 $63 $37 $4 
Interest cost268 61 31 429 88 44 
Expected return on plan assets(794)(158)— (817)(163)— 
Amortization of prior service cost (credit)(1)2 (1)(1)1 (2)
Amortization of net actuarial losses6 54 23 4 40 18 
Net periodic pension and OPEB (income) expense$(455)$(9)$58 $(322)$3 $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 $9 $125 $66 $9 
Interest cost537 120 62 858 179 87 
Expected return on plan assets(1,589)(310)— (1,633)(333)— 
Amortization of prior service cost (credit)(2)3 (3)(2)3 (4)
Amortization of net actuarial losses13 108 48 8 82 37 
Net periodic pension and OPEB (income) expense$(910)$(9)$116 $(644)$(3)$129 
The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $485 million and $336 million in the three months ended June 30, 2021 and 2020 and $968 million and $674 million in the six months ended June 30, 2021 and 2020 are presented in Interest income and other non-operating income, net.