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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three and six months ended March 31:
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
(Millions of dollars)
2020
 
2019
 
2020
 
2019
Service cost
$
39

 
$
33

 
$
79

 
$
68

Interest cost
21

 
26

 
43

 
54

Expected return on plan assets
(48
)
 
(45
)
 
(97
)
 
(91
)
Amortization of prior service credit
(3
)
 
(3
)
 
(7
)
 
(7
)
Amortization of loss
25

 
19

 
50

 
39

Net pension cost
$
34

 
$
31

 
$
68

 
$
63