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Financing Arrangement (Tables)
 6 Months Ended
Sep. 30, 2013
Debt Instruments [Abstract]  
Carrying Values Of Liability And Equity Components Of Notes
The carrying values of the liability and equity components of the Notes are reflected in our Condensed Consolidated Balance Sheet as follows (in millions): 
  
As of
September 30, 2013
 
As of
March 31, 2013
Principal amount of Notes
$
633

 
$
633

Unamortized discount of the liability component
(63
)
 
(74
)
Net carrying amount of Notes
$
570

 
$
559

Equity component, net
$
105

 
$
105
Schedule Of Interest Expense
The following table summarizes our interest expense recognized for the three and six months ended September 30, 2013 and 2012 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,
 
2013
 
2012
 
2013
 
2012
Amortization of debt discount
$
5

 
$
5

 
$
10

 
$
10

Amortization of debt issuance costs
1

 
1

 
2

 
2

Coupon interest expense
1

 
1

 
2

 
2

Other interest expense
1

 
—

 
1

 
—

Total interest expense
$
8

 
$
7

 
$
15

 
$
14