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Retirement Plans (Tables)
 6 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The following table contains the components of net periodic benefit cost:
 
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
(in millions)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
2

 
$
2

 
$
4

 
$
4

Interest cost
 
3

 
3

 
6

 
7

Expected return on plan assets
 
(3
)
 
(4
)
 
(8
)
 
(9
)
Settlement (gain) loss
 
—

 
(6
)
 
—

 
(6
)
Net periodic benefit cost
 
$
2

 
$
(5
)
 
$
2

 
$
(4
)