|**Financing Arrangement (Tables)**                          | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|**Debt Instruments [Abstract]**                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Carrying Values Of Liability And Equity Components Of Notes | The carrying and fair values of the Notes are as follows (in millions):As of December 31, 2015As of March 31, 2015Principal amount of Notes$340$633Unamortized debt discount of the liability component(7)(31)Net carrying value of Notes$333$602Fair value of Notes$750$1,158                                                                                                                                                                                                                                                                                                            
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|                                                            | As of December 31, 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Principal amount of Notes                                   | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Unamortized debt discount of the liability component        | (7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Net carrying value of Notes                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Fair value of Notes                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Schedule Of Interest Expense                                | The following table summarizes our interest expense recognized for thethree and nine months ended December 31, 2015 and 2014that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):Three Months Ended December 31,Nine Months Ended December 31,2015201420152014Loss on conversion of senior notes$(2)$—$(8)$—Amortization of debt discount(3)(5)(14)(16)Amortization of debt issuance costs(1)—(2)(2)Coupon interest expense(1)(2)(3)(4)Other interest expense—(1)—(2)Total interest expense$(7)$(8)$(27)$(24)
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|                                                            | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                            | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Loss on conversion of senior notes                          | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Amortization of debt discount                               | (3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Amortization of debt issuance costs                         | (1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Coupon interest expense                                     | (1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Other interest expense                                      | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Total interest expense                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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