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Employee Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2018
Retirement Benefits [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 nine months ended June 30:

 
 
 
 
 
 
Other postretirement benefits
 
 
Pension benefits
 
(In millions)
 
2018
 
2017
 
2018
 
2017
Three months ended June 30
 
 
 
 
 
 
 
 
Service cost
 
$
—

 
$
1

 
$
—

 
$
—

Interest cost
 
19

 
22

 
—

 
—

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

 
—

Amortization of prior service credit
 
—

 
—

 
(3
)
 
(3
)
Net periodic benefit income
 
$
(7
)
 
$
(13
)
 
$
(3
)
 
$
(3
)
 
 
 
 
 
 
 
 
 
Nine months ended June 30
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
2

 
$
—

 
$
—

Interest cost
 
56

 
65

 
1

 
1

Expected return on plan assets
 
(78
)
 
(109
)
 
—

 
—

Amortization of prior service credit
 
—

 
—

 
(9
)
 
(9
)
Actuarial gain
 
—

 
—

 
—

 
(8
)
Net periodic benefit income
 
$
(21
)
 
$
(42
)
 
$
(8
)
 
$
(16
)