v3.25.2
Pension and Postretirement Plans
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Pension and Postretirement Plans Pension and Postretirement Plans
The components of net periodic benefit cost for the three and six months ended June 30, 2025 and 2024, were as follows:
 Millions of Dollars
 Pension BenefitsOther Benefits
 202520242025 2024 
U.S.Int’l.U.S.Int’l.
Components of Net Periodic Benefit Cost
Three Months Ended June 30
Service cost$30 3 29 4 1 — 
Interest cost32 10 29 8 2 2 
Expected return on plan assets(38)(12)(39)(11)— — 
Amortization of net actuarial loss (gain)4 (1)3 — (2)(1)
Settlements2 — 3 — — — 
Net periodic benefit cost*$30 — 25 1 1 1 
Six Months Ended June 30
Service cost$61 6 58 7 1 1 
Interest cost64 18 57 16 4 4 
Expected return on plan assets(76)(23)(77)(22)— — 
Amortization of net actuarial loss (gain)8 (1)6 — (3)(2)
Settlements4 — 4 — — — 
Net periodic benefit cost*$61 — 48 1 2 3 
* Included in the “Operating expenses” and “Selling, general and administrative expenses” line items on our consolidated statement of income.


During the six months ended June 30, 2025, we contributed $56 million to our U.S. pension and other postretirement benefit plans and $3 million to our international pension plans. We currently expect to make additional contributions of approximately $107 million to our U.S. pension and other postretirement benefit plans and approximately $3 million to our international pension plans during the remainder of 2025. Cash contributions are included in the “Other” line item of the “Cash Flows From Operating Activities” section of our consolidated statement of cash flows.