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Financing Arrangement (Tables)
 6 Months Ended
Sep. 30, 2018
Debt Instruments [Abstract]  
Schedule of Carrying Values Of Liability and Equity Components of Senior Notes [Table Text Block]
The carrying and fair values of the Senior Notes are as follows (in millions): 
  
As of
September 30, 2018
 
As of
March 31, 2018
Senior Notes:
 
 
 
3.70% Senior Notes due 2021
$
600

 
$
600

4.80% Senior Notes due 2026
400

 
400

Total principal amount
$
1,000

 
$
1,000

Unaccreted discount
(1
)
 
(2
)
Unamortized debt issuance costs
(6
)
 
(6
)
Net carrying value of Senior Notes
$
993

 
$
992

 
 
 
 
Fair value of Senior Notes (Level 2)
$
1,024

 
$
1,038
Schedule Of Interest Expense
The following table summarizes our interest expense recognized for the three and six months ended September 30, 2018 and 2017 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions): 
 
Three Months Ended
September 30,
 
Six Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Amortization of debt issuance costs
$
—

 
$
—

 
(1
)
 
(1
)
Coupon interest expense
(11
)
 
(11
)
 
(21
)
 
(21
)
Total interest expense
$
(11
)
 
$
(11
)
 
$
(22
)
 
$
(22
)