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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2024
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)20242023
Service cost$12 $25 
Interest cost42 39 
Expected return on plan assets(56)(42)
Amortization of prior service credit— (1)
Amortization of loss10 16 
Net pension cost$8 $37