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Benefit Plans (Tables)
6 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three and six-month periods:
 Three Months Ended
March 31,
Six Months Ended
March 31,
(Millions of dollars)2025202420252024
Service cost$$22 $20 $47 
Interest cost28 35 70 74 
Expected return on plan assets(38)(38)(93)(80)
Amortization of prior service credit— (1)— (2)
Amortization of loss14 17 30 
Net pension cost$$33 $13 $69