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Pensions and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
Three Months Ended March 31, 2021Three Months Ended March 31, 2020
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$65 $38 $4 $62 $29 $5 
Interest cost269 59 31 429 91 43 
Expected return on plan assets(795)(152)— (816)(170)— 
Amortization of prior service cost (credit)(1)1 (2)(1)2 (2)
Amortization of net actuarial losses7 54 25 4 42 19 
Net periodic pension and OPEB (income) expense$(455)$— $58 $(322)$(6)$65 
The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $483 million and $338 million in the three months ended March 31, 2021 and 2020 are presented in Interest income and other non-operating income, net.