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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension cost included the following components for the three months ended December 31:
 
Pension Plans
(Millions of dollars)
2017
 
2016
Service cost
$
30

 
$
24

Interest cost
18

 
16

Expected return on plan assets
(33
)
 
(30
)
Amortization of prior service credit
(3
)
 
(4
)
Amortization of loss
20

 
25

Net pension and postretirement cost
$
32

 
$
32