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Postretirement Benefits
 6 Months Ended
Jun. 30, 2023
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
June 30June 30June 30
(Millions of dollars)202320222023202220232022
For the three months ended:      
Components of net periodic benefit cost:      
Service cost$— $— $10 $12 $17 $25 
Interest cost164 101 30 18 36 20 
Expected return on plan assets (172)(168)(40)(33)(3)(2)
Amortization of prior service cost (credit)— — — — (3)(2)
Net periodic benefit cost (benefit) 1
$(8)$(67)$— $(3)$47 $41 
For the six months ended:
Components of net periodic benefit cost:
Service cost$— $— $20 $25 $34 $50 
Interest cost328 201 61 36 72 40 
Expected return on plan assets (344)(335)(80)(67)(6)(6)
Amortization of prior service cost (credit)— — — — (6)(3)
Net periodic benefit cost (benefit) 1
$(16)$(134)$1 $(6)$94 $81 
1 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 $56 million and $264 million of contributions to our pension and other postretirement plans during the three and six months ended June 30, 2023, respectively. We currently anticipate full-year 2023 contributions of approximately $372 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 June 30Six Months Ended June 30
(Millions of dollars)2023202220232022
U.S. Plans$136 $34 $285 $149 
Non-U.S. Plans29 27 58 56 
 $165 $61 $343 $205 

The increase in the U.S. defined contribution benefit costs for the three and six months ended June 30, 2023 was primarily due to the fair value adjustments related to our non-qualified deferred compensation plans.