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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Net Pension and Postretirement Cost
Net pension and postretirement cost included the following components for the three months ended December 31:
 
Pension Plans
 
Other Postretirement Benefits
(Millions of dollars)
2015
 
2014
 
2015
 
2014
Service cost
$
21

 
$
19

 
$
1

 
$
1

Interest cost
19

 
22

 
1

 
2

Expected return on plan assets
(29
)
 
(31
)
 
—

 
—

Amortization of prior service credit
(4
)
 
(4
)
 
(1
)
 
(1
)
Amortization of loss
20

 
17

 
—

 
1

Net pension and postretirement cost
$
28

 
$
23

 
$
1

 
$
2