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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic benefit cost are as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2015
 
2014
 
2015

2014
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Service cost
$
12

 
$
11

 
$
35

 
$
34

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
10

 
10

 
30

 
31

 
—

 
—

 
—

 
—

Expected return on assets
(18
)
 
(17
)
 
(54
)
 
(51
)
 
—

 
—

 
—

 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       Prior service credit
(2
)
 
(2
)
 
(5
)
 
(6
)
 
—

 
—

 
(2
)
 
(2
)
       Actuarial loss (gain)
—

 
1

 
—

 
1

 
(1
)
 
(1
)
 
(1
)
 
(1
)
Curtailment gain
—

 
—

 
—

 
(3
)
 
—

 
—

 
—

 
—

Settlement loss
1

 
2

 
5

 
3

 
—

 
—

 
—

 
—

Total net periodic benefit cost
$
3

 
$
5

 
$
11

 
$
9

 
$
(1
)
 
$
(1
)
 
$
(3
)
 
$
(3
)