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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2019
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)
2019
 
2018
 
2019
 
2018
Service cost
$
33

 
$
34

 
$
68

 
$
64

Interest cost
26

 
22

 
54

 
41

Expected return on plan assets
(45
)
 
(40
)
 
(91
)
 
(72
)
Amortization of prior service credit
(3
)
 
(3
)
 
(7
)
 
(7
)
Amortization of loss
19

 
19

 
39

 
39

Settlements
—

 
2

 
—

 
2

Net pension cost
$
31

 
$
35

 
$
63

 
$
67