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Pension and Postretirement Plans (Tables)
3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended March 31, 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 March 31
Service cost$31 3 29  
Interest cost32 8 28 2 
Expected return on plan assets(38)(11)(38)(11) — 
Amortization of net actuarial loss (gain)4  — (1)(1)
Settlements2  —  — 
Net periodic benefit cost*$31  23 — 1 
* Included in the “Operating expenses” and “Selling, general and administrative expenses” line items on our consolidated statement of income.