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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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)
2016
 
2015
 
2016
 
2015
Service cost
$
20

 
$
20

 
$
1

 
$
1

Interest cost
18

 
22

 
1

 
2

Expected return on plan assets
(27
)
 
(32
)
 
—

 
—

Amortization of prior service credit
(4
)
 
(4
)
 
(1
)
 
(1
)
Amortization of loss
19

 
18

 
—

 
1

Settlements
3

 
—

 
—

 
—

Net pension and postretirement cost
$
29

 
$
24

 
$
1

 
$
2


Net pension and postretirement cost included the following components for the nine months ended June 30:
 
Pension Plans
 
Other Postretirement Benefits
(Millions of dollars)
2016
 
2015
 
2016
 
2015
Service cost
$
61

 
$
58

 
$
2

 
$
2

Interest cost
54

 
66

 
4

 
6

Expected return on plan assets
(82
)
 
(93
)
 
—

 
—

Amortization of prior service credit
(11
)
 
(12
)
 
(4
)
 
(4
)
Amortization of loss
58

 
52

 
1

 
2

Settlements
4

 
—

 
—

 
—

Net pension and postretirement cost
$
85

 
$
70

 
$
4

 
$
7