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Postretirement Benefits
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Postretirement Benefits Postretirement benefits
 
A.  Pension and postretirement benefit costs    
U.S. Pension
Benefits
Non-U.S. Pension
Benefits
Other
Postretirement
Benefits
(Millions of dollars)

September 30September 30September 30
 202120202021202020212020
For the three months ended:      
Components of net periodic benefit cost:      
Service cost$— $— $15 $13 $25 $24 
Interest cost82 120 16 17 16 26 
Expected return on plan assets (180)(197)(33)(34)(1)(4)
Amortization of prior service cost (credit)— — — — (11)(9)
(Gain) loss on remeasurement of pension obligations 1
— (2)— 79 — — 
Curtailments, settlements and termination benefits 1
— — — 4 — — 
Net periodic benefit cost (benefit) 2
$(98)$(79)$(2)$79 $29 $37 
For the nine months ended:
Components of net periodic benefit cost:
Service cost$— $— $44 $41 $75 $71 
Interest cost247 362 43 57 48 79 
Expected return on plan assets (538)(593)(98)(107)(4)(10)
Amortization of prior service cost (credit)— — — — (31)(28)
(Gain) loss on remeasurement of pension obligations 1
— — — (55)— — 
Curtailments, settlements and termination benefits 1
— — — 25 — — 
Net periodic benefit cost (benefit) 2
$(291)$(231)$(11)$(39)$88 $112 
1    Total lump-sum transfers out of certain pension plans exceeded the service and interest cost for 2020, which required us to follow settlement accounting and remeasure the plans' obligations as of March 31, 2020, June 30, 2020 and September 30, 2020.
2    The service cost component is included in Operating costs in the Consolidated Statement of Results of Operations. All other components are included in Other income (expense) in the Consolidated Statement of Results of Operations.

We made $69 million and $229 million of contributions to our pension and other postretirement plans during the three and nine months ended September 30, 2021, respectively. We currently anticipate full-year 2021 contributions of approximately $310 million.
 
B.  Defined contribution benefit costs
 
Total company costs related to our defined contribution plans, which are included in Operating Costs in the Consolidated Statement of Results of Operations, were as follows:
 
 Three Months Ended September 30Nine Months Ended September 30
(Millions of dollars)2021202020212020
U.S. Plans$81 $103 $321 $248 
Non-U.S. Plans29 22 83 65 
 $110 $125 $404 $313 

The increase in the U.S. defined contribution benefit costs for the nine months ended September 30, 2021 was primarily due to the fair value adjustments related to our non-qualified deferred compensation plans.