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Pension and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
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) loss(1)(4)
Settlement gain— — — (2)
Net periodic pension benefit cost$52 $31 $132 $75 
Other Benefits
Service cost$$$15 $14 
Interest cost24 23 
Amortization of prior service credit(5)(5)(16)(16)
Net periodic other benefit cost$$$23 $21