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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit costs for 2025 and 2024 are as follows:
 Three Months Ended
March 31
 20252024
(Millions of dollars)
Pension Benefits
United States
Service cost$90 $89 
Interest cost124 116 
Expected return on plan assets(174)(149)
Amortization of prior service costs (credits) 1 1 
Amortization of actuarial losses (gains)30 61 
Total United States71 118 
International
Service cost14 14 
Interest cost48 47 
Expected return on plan assets(47)(50)
Amortization of prior service costs (credits)3 3 
Amortization of actuarial losses (gains)12 5 
Total International30 19 
Net Periodic Pension Benefit Costs$101 $137 
Other Benefits*
Service cost$7 $8 
Interest cost25 25 
Amortization of prior service costs (credits)(6)(6)
Amortization of actuarial losses (gains)(4)(4)
Net Periodic Other Benefit Costs$22 $23 
* Includes costs for U.S. and international OPEB plans. Obligations for plans outside the United States are not significant relative to the company’s total OPEB obligation.