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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2018
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)
2018
 
2017
 
2018
 
2017
Service cost
$
34

 
$
27

 
$
64

 
$
51

Interest cost
22

 
18

 
41

 
35

Expected return on plan assets
(40
)
 
(33
)
 
(72
)
 
(63
)
Amortization of prior service credit
(3
)
 
(4
)
 
(7
)
 
(8
)
Amortization of loss
19

 
28

 
39

 
52

Settlements
2

 
—

 
2

 
—

Net pension and postretirement cost
$
35

 
$
35

 
$
67

 
$
67