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Benefit Plans (Tables)
6 Months Ended
Mar. 31, 2022
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)2022202120222021
Service cost$34 $36 $69 $79 
Interest cost19 17 38 37 
Expected return on plan assets(46)(41)(94)(89)
Amortization of prior service credit(4)(3)(8)(7)
Amortization of loss15 23 31 50 
Settlements— — 
Net pension cost$18 $32 $42 $69