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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Pension and Other Postretirement Plans Pension and Other Postretirement Benefits
The following summarizes the components of net periodic benefit costs:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2024202320242023
Pension Benefits
Service cost$63 $53 $170 $150 
Interest cost31 29 92 87 
Expected return on plan assets(36)(38)(110)(122)
Amortization of prior service credit(9)(12)(25)(34)
Amortization of actuarial (gain) loss3 (1)5 (4)
Settlement gain— — — (2)
Net periodic pension benefit cost$52 $31 $132 $75 
Other Benefits
Service cost$5 $4 $15 $14 
Interest cost8 7 24 23 
Amortization of prior service credit(5)(5)(16)(16)
Net periodic other benefit cost$8 $6 $23 $21 
The components of net periodic benefit cost, other than the service cost component, are included in net interest and other financial costs on the consolidated statements of income.
During the nine months ended September 30, 2024, we made contributions of $92 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $8 million and $37 million, respectively, during the nine months ended September 30, 2024.