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Retirement Plans (Tables)
 9 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The following table contains the components of net periodic benefit cost:
 
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
(in millions)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
2

 
$
2

 
$
6

 
$
6

Interest cost
 
3

 
3

 
9

 
10

Expected return on plan assets
 
(4
)
 
(4
)
 
(12
)
 
(13
)
Net actuarial (gain) loss
 
6

 
—

 
6

 
—

Settlement (gain) loss
 
—

 
(9
)
 
—

 
(15
)
Net periodic benefit cost
 
$
7

 
$
(8
)
 
$
9

 
$
(12
)