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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three and nine months ended June 30:
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
(Millions of dollars)
2019
 
2018
 
2019
 
2018
Service cost
$
33

 
$
43

 
$
101

 
$
107

Interest cost
26

 
29

 
80

 
70

Expected return on plan assets
(44
)
 
(52
)
 
(135
)
 
(125
)
Amortization of prior service credit
(3
)
 
(3
)
 
(10
)
 
(10
)
Amortization of loss
19

 
20

 
58

 
59

Settlements
—

 
4

 
—

 
6

Net pension cost
$
30

 
$
39

 
$
93

 
$
107