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Financing Arrangement (Tables)
 12 Months Ended
Mar. 31, 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
March 31, 2018
As of
March 31, 2017
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
(2
)
(2
)
Unamortized debt issuance costs
(6
)
(8
)
Net carrying value of Senior Notes
$
992

$
990

 
 
 
Fair value of Senior Notes (Level 2)
$
1,038

$
1,054
Schedule Of Interest Expense Related To Notes
The following table summarizes our interest expense recognized for fiscal years 2018, 2017, and 2016 that is included in interest and other income (expense), net on our Consolidated Statements of Operations (in millions): 
 
Year Ended March 31,
 
2018
 
2017
 
2016
Amortization of debt discount
—

 
(2
)
 
(17
)
Amortization of debt issuance costs
(2
)
 
(2
)
 
(3
)
Coupon interest expense
(42
)
 
(42
)
 
(7
)
Other interest expense
—

 
(1
)
 
(1
)
Total interest expense
$
(44
)
 
$
(47
)
 
$
(28
)