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Pensions and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
Three Months Ended September 30, 2020Three Months Ended September 30, 2019
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$63 $41 $5 $99 $38 $4 
Interest cost429 92 43 566 148 54 
Expected return on plan assets(816)(174)— (871)(240)— 
Amortization of prior service cost (credit)(1)2 (1)(1)2 (3)
Amortization of net actuarial losses4 44 18 2 31 7 
Curtailments, settlements and other— 15 — — 119 — 
Net periodic pension and OPEB (income) expense$(321)$20 $65 $(205)$98 $62 

Nine Months Ended September 30, 2020Nine Months Ended September 30, 2019
Pension BenefitsGlobal OPEB PlansPension BenefitsGlobal OPEB Plans
U.S.Non-U.S.U.S.Non-U.S.
Service cost$188 $107 $14 $295 $102 $12 
Interest cost1,287 271 130 1,698 386 163 
Expected return on plan assets(2,449)(507)— (2,610)(627)— 
Amortization of prior service cost (credit)(3)5 (5)(3)4 (10)
Amortization of net actuarial losses12 126 55 8 90 22 
Curtailments, settlements and other— 15 — — 119 — 
Net periodic pension and OPEB (income) expense$(965)$17 $194 $(612)$74 $187 
The curtailment and other charges in the three and nine months ended September 30, 2019 were primarily due to remeasurement of the General Motors Canada Company hourly pension plan as a result of transformation activities. Refer to Note 17 for additional information on transformation-related charges.

The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $322 million and $125 million in the three months ended September 30, 2020 and 2019 and $996 million and $587 million in the nine months ended September 30, 2020 and 2019 are presented in Interest income and other non-operating income, net.