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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Net Pension and Postretirement Cost
Net pension and postretirement cost included the following components for the three months ended June 30:
 
Pension Plans
 
Other Postretirement Benefits
(Millions of dollars)
2017
 
2016
 
2017
 
2016
Service cost
$
27

 
$
20

 
$
1

 
$
1

Interest cost
18

 
18

 
1

 
1

Expected return on plan assets
(34
)
 
(27
)
 
—

 
—

Amortization of prior service credit
(4
)
 
(4
)
 
(1
)
 
(1
)
Amortization of loss
28

 
19

 
—

 
—

Settlements
—

 
3

 
—

 
—

Net pension and postretirement cost
$
36

 
$
29

 
$
1

 
$
1


Net pension and postretirement cost included the following components for the nine months ended June 30:
 
Pension Plans
 
Other Postretirement Benefits
(Millions of dollars)
2017
 
2016
 
2017
 
2016
Service cost
$
79

 
$
61

 
$
2

 
$
2

Interest cost
53

 
54

 
3

 
4

Expected return on plan assets
(97
)
 
(82
)
 
—

 
—

Amortization of prior service credit
(12
)
 
(11
)
 
(4
)
 
(4
)
Amortization of loss
80

 
58

 
1

 
1

Settlements
—

 
4

 
—

 
—

Net pension and postretirement cost
$
103

 
$
85

 
$
3

 
$
4