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Pension and Other Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension expense (benefit) were:
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
Service cost
 
$
—

 
$
—

 
$
1

 
$
—

Interest cost
 
5

 
5

 
9

 
6

Expected return on assets
 
(8
)
 
(7
)
 
(15
)
 
(9
)
Net periodic pension benefit
 
$
(3
)
 
$
(2
)
 
$
(5
)
 
$
(3
)