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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three and nine-month periods:
 Three Months Ended
June 30,		Nine Months Ended
June 30,
(Millions of dollars)2024202320242023
Service cost$22 $24 $69 $71 
Interest cost34 35 108 103 
Expected return on plan assets(37)(38)(117)(112)
Amortization of prior service credit(1)(2)(3)(5)
Amortization of loss14 17 44 49 
Curtailment/settlement gain— (14)— (13)
Net pension cost$32 $22 $101 $92