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Financing Arrangement (Tables)
 12 Months Ended
Mar. 31, 2017
Debt Instruments [Abstract]  
Carrying Values Of Liability And Equity Components Of Notes
The carrying and fair values of the Convertible Notes are as follows (in millions): 
  
As of
March 31, 2017
 
As of
March 31, 2016
Principal amount of Convertible Notes
$
—

 
$
163

Unamortized debt discount of the liability component
—

 
(2
)
Net carrying value of Convertible Notes
$
—

 
$
161

 
 
 
 
Fair value of Convertible Notes (Level 2)
$
—

 
$
338
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, 2017
As of
March 31, 2016
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
(8
)
(9
)
Net carrying value of Senior Notes
$
990

$
989

 
 
 
Fair value of Senior Notes (Level 2)
$
1,054

$
1,039
Schedule Of Interest Expense Related To Notes
The following table summarizes our interest expense recognized for fiscal years 2017, 2016, and 2015 that is included in interest and other income (expense), net on our Consolidated Statements of Operations (in millions): 
 
Year Ended March 31,
 
2017
 
2016
 
2015
Amortization of debt discount
(2
)
 
(17
)
 
(22
)
Amortization of debt issuance costs
(2
)
 
(3
)
 
(3
)
Coupon interest expense
(42
)
 
(7
)
 
(5
)
Other interest expense
(1
)
 
(1
)
 
(1
)
Total interest expense
$
(47
)
 
$
(28
)
 
$
(31
)