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Employee Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [Abstract]  
Components of Pension and Other Postretirement Benefit Income
The following table summarizes the components of pension and other postretirement benefit income for the three and six months ended March 31:

 
 
 
 
 
 
Other postretirement benefits
 
 
Pension benefits
 
(In millions)
 
2018
 
2017
 
2018
 
2017
Three months ended March 31
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
—

 
$
—

 
$
—

Interest cost
 
18

 
22

 
1

 
—

Expected return on plan assets
 
(26
)
 
(36
)
 
—

 
—

Amortization of prior service credit
 
—

 
—

 
(3
)
 
(3
)
Net periodic benefit income
 
$
(7
)
 
$
(14
)
 
$
(2
)
 
$
(3
)
 
 
 
 
 
 
 
 
 
Six months ended March 31
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
1

 
$
—

 
$
—

Interest cost
 
37

 
43

 
1

 
—

Expected return on plan assets
 
(52
)
 
(72
)
 
—

 
—

Amortization of prior service credit
 
—

 
—

 
(6
)
 
(6
)
Actuarial gain
 
—

 
—

 
—

 
(8
)
Net periodic benefit income
 
$
(14
)
 
$
(28
)
 
$
(5
)
 
$
(14
)