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Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Components of Expense (Income) for Pension Benefits and Other Retirement Benefits
The components of expense (income) for Pension Benefits and Other Retirement Benefits for the three months ended December 31, 2017 and 2016, are summarized as follows:
 
Pension Benefits
 
Other Retirement Benefits
 
Three Months Ended
 
Three Months Ended
 
December 31
 
December 31
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
3

 
$
3

 
$
—

 
$
—

Interest cost
30

 
28

 
1

 
1

Expected return on plan assets
(60
)
 
(60
)
 
—

 
—

Amortization:
 
 
 

 
 
 
 

Prior service credit
—

 
—

 
—

 
—

Net actuarial loss
20

 
23

 
2

 
2

Net benefit expense (income)
$
(7
)
 
$
(6
)
 
$
3

 
$
3