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Pensions and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
Three Months Ended September 30, 2021Three Months Ended September 30, 2020
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$65 $35 $4 $63 $41 $5 
Interest cost269 60 31 429 92 43 
Expected return on plan assets(796)(154)— (816)(174)— 
Amortization of prior service cost (credit)— 1 (2)(1)2 (1)
Amortization of net actuarial losses7 53 25 4 44 18 
Curtailments, settlements and other— — — — 15 — 
Net periodic pension and OPEB (income) expense$(455)$(5)$58 $(321)$20 $65 

Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$196 $105 $13 $188 $107 $14 
Interest cost806 180 93 1,287 271 130 
Expected return on plan assets(2,385)(464)— (2,449)(507)— 
Amortization of prior service cost (credit)(2)4 (5)(3)5 (5)
Amortization of net actuarial losses20 161 73 12 126 55 
Curtailments, settlements and other— — — — 15 — 
Net periodic pension and OPEB (income) expense$(1,365)$(14)$174 $(965)$17 $194 
The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $484 million and $322 million in the three months ended September 30, 2021 and 2020 and $1.5 billion and $996 million in the nine months ended September 30, 2021 and 2020 are presented in Interest income and other non-operating income, net.