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Benefit Plans (Tables)
3 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three-month periods:
 Three Months Ended
December 31,
(Millions of dollars)20232022
Service cost$25 $24 
Interest cost39 35 
Expected return on plan assets(42)(38)
Amortization of prior service credit(1)(2)
Amortization of loss16 17 
Net pension cost$37 $36