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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Dec. 31, 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
December 31,
 
Three Months Ended
December 31,
 
2015

2014
 
2015
 
2014
 
(in millions)
Service cost
$
13

 
$
12

 
$
—

 
$
—

Interest cost
11

 
10

 
—

 
—

Expected return on assets
(17
)
 
(18
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
       Prior service credit
(1
)
 
(2
)
 
(1
)
 
(1
)
       Actuarial loss
2

 
—

 
—

 
—

Curtailment gain
(8
)
 
—

 
—

 
—

Settlement loss
—

 
2

 
—

 
—

Total net periodic benefit cost
$
—

 
$
4

 
$
(1
)
 
$
(1
)