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Retirement Plans (Tables)
 3 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The following table contains the components of net periodic benefit cost:
 
 
Three Months Ended December 31,
(in millions)
 
2018
 
2017
Service cost
 
$
2

 
$
2

Interest cost
 
3

 
4

Expected return on plan assets
 
(5
)
 
(5
)
Net periodic benefit cost
 
$
—

 
$
1