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Employee Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Benefit Costs
The following table summarizes the components of pension and other postretirement benefit income for the three months ended December 31:
 
 
 
 
 
 
Other postretirement benefits
 
 
Pension benefits
 
(In millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
—

 
$
1

 
$
—

 
$
—

Interest cost
 
19

 
21

 
—

 
—

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

 
—

Amortization of prior service credit
 
—

 
—

 
(3
)
 
(3
)
Actuarial gain
 
—

 
—

 
—

 
(8
)
Net periodic benefit income
 
$
(7
)
 
$
(14
)

$
(3
)
 
$
(11
)