| **Financing Arrangement (Tables)**                                                                | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **Debt Instruments [Abstract]**                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 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 ofMarch 31, 2016Senior Notes: 3.70% Senior Notes due 2021$6004.80% Senior Notes due 2026400Total principal amount$1,000Unaccreted discount(2)Unamortized debt issuance costs(9)Net carrying value of Senior Notes$989  Fair value of Senior Notes (Level 2)$1,039                                                                                                                                                              |
| Carrying Values Of Liability And Equity Components Of Notes                                       | The carrying and fair values of the Convertible Notes are as follows (in millions):   As ofMarch 31, 2016 As ofMarch 31, 2015Principal amount of Convertible Notes$163 $633Unamortized debt discount of the liability component(2) (31)Net carrying value of Convertible Notes$161 $602    Fair value of Convertible Notes (Level 2)$338 $1,158                                                                                                                                      |
| Schedule Of Interest Expense Related To Notes                                                     | The following table summarizes our interest expense recognized for fiscal years 2016, 2015, and 2014 that is included in interest and other income (expense), net on our Consolidated Statements of Operations (in millions):  Year Ended March 31, 2016 2015 2014Amortization of debt discount(17) (22) (21)Amortization of debt issuance costs(3) (3) (3)Coupon interest expense(7) (5) (5)Other interest expense(1) (1) (1)Total interest expense$(28) $(31) $(30) |

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