Pension and Other Postretirement Benefits
 6 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefits
Note 5—Pension and Other Postretirement Benefits
The Company sponsors various qualified and non-qualified defined benefit pension and other postretirement benefit plans that provide for retirement and medical benefits for substantially all employees residing in the United States. The Company also sponsors other pension benefit plans that provide benefits for internationally-based employees at certain non-U.S. locations, which are not presented below as they are not material.
The components of net periodic benefit cost are as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2015
 
2014
 
2015

2014
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Service cost
$
11

 
$
12

 
$
23

 
$
23

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
10

 
11

 
20

 
21

 
—

 
—

 
—

 
—

Expected return on assets
(18
)
 
(17
)
 
(36
)
 
(34
)
 
—

 
—

 
—

 
—

Amortization of prior service credit
(1
)
 
(2
)
 
(3
)
 
(4
)
 
(1
)
 
(1
)
 
(2
)
 
(2
)
Curtailment gain
—

 
(3
)
 
—

 
(3
)
 
—

 
—

 
—

 
—

Settlement loss
2

 
—

 
4

 
1

 
—

 
—

 
—

 
—

Total net periodic benefit cost
$
4

 
$
1

 
$
8

 
$
4

 
$
(1
)
 
$
(1
)
 
$
(2
)
 
$
(2
)