Retirement Benefits
 6 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefits
Retirement Benefits

The Company sponsors defined benefit pension (Pension Benefits) and other postretirement (Other Retirement Benefits) plans which provide monthly pension and other benefits to eligible employees upon retirement.

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

 
$
3

 
$
1

 
$
1

Interest cost
27

 
31

 
2

 
2

Expected return on plan assets
(60
)
 
(59
)
 
(1
)
 
(1
)
Amortization:
 
 
 

 
 
 
 

Prior service credit
—

 
(1
)
 
—

 
—

Net actuarial loss
23

 
20

 
2

 
2

Net benefit expense (income)
$
(7
)
 
$
(6
)
 
$
4

 
$
4

 
Pension Benefits
 
Other Retirement Benefits
 
Six Months Ended
 
Six Months Ended
 
March 31
 
March 31
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
6

 
$
6

 
$
1

 
$
1

Interest cost
55

 
63

 
3

 
3

Expected return on plan assets
(120
)
 
(119
)
 
(1
)
 
(1
)
Amortization:
 
 
 
 
 
 
 
Prior service credit
—

 
(1
)
 
—

 
—

Net actuarial loss
46

 
39

 
4

 
4

Net benefit expense (income)
$
(13
)
 
$
(12
)
 
$
7

 
$
7


Pension Plan Funding
The Company’s objective with respect to the funding of its pension plans is to provide adequate assets for the payment of future benefits. Pursuant to this objective, the Company will fund its pension plans as required by governmental regulations and may consider discretionary contributions as conditions warrant. In October 2016, the Company voluntarily contributed $55 million to its U.S. qualified pension plans. There is no minimum statutory funding requirement for 2017 and the Company does not currently expect to make any additional discretionary contributions during 2017 to those plans. Any additional future contributions necessary to satisfy minimum statutory funding requirements are dependent upon actual plan asset returns, interest rates and actuarial assumptions. Contributions to the non-U.S. plans and the U.S. non-qualified pension plan are expected to total $13 million in 2017. During the six months ended March 31, 2017, the Company made contributions to the non-U.S. plans and the U.S. non-qualified pension plan of $8 million.