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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following summarizes the components of net periodic benefit costs:
Three Months Ended 
June 30,
Six Months Ended 
June 30,
(Millions of dollars)2025202420252024
Pension Benefits
Service cost$57 $53 $112 $107 
Interest cost35 31 72 61 
Expected return on plan assets(35)(37)(72)(74)
Amortization of prior service credit(2)(8)(4)(16)
Amortization of actuarial loss
Settlement loss— — 
Net periodic pension benefit cost$60 $40 $117 $80 
Other Benefits
Service cost$$$10 $10 
Interest cost17 16 
Amortization of prior service credit(5)(6)(11)(11)
Net periodic other benefit cost$$$16 $15