| **Financing Arrangement (Tables)**                          | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **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 June 30, 2013 As of March 31, 2013Principal amount of Notes$633 $633Unamortized discount of the liability component(69) (74)Net carrying amount of Notes$564 $559Equity component, net$105 $105                                                     |
| Schedule Of Interest Expense                                | The following table summarizes our interest expense recognized for the three months ended June 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 June 30, 2013 2012Amortization of debt discount$5 $5Amortization of debt issuance costs1 1Coupon interest expense1 1Total interest expense$7 $7 |

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