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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2021
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)20212020
Service cost$35 $43 
Interest cost20 20 
Expected return on plan assets(48)(48)
Amortization of prior service credit(4)(4)
Amortization of loss16 27 
Settlements5 — 
Net pension cost$24 $38