| **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, 2014 As of March 31, 2014Principal amount of Notes$633 $633Unamortized debt discount of the liability component(37) (53)Net carrying value of Notes$596 $580    Fair value of Notes$972 731                                                                                                                                                                                                                                                                                                                                                 |
| Schedule Of Interest Expense                                | The following table summarizes our interest expense recognized for the three and nine months ended December 31, 2014 and 2013 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):  Three Months Ended December 31, Nine Months Ended December 31, 2014 2013 2014 2013Amortization of debt discount$(5) $(6) $(16) $(16)Amortization of debt issuance costs— (1) (2) (3)Coupon interest expense(2) (1) (4) (3)Other interest expense(1) — (2) (1)Total interest expense$(8) $(8) $(24) $(23) |

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