| **Financing Arrangement (Tables)**                                                                | 6 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 Convertible Notes are as follows (in millions):   As of September 30, 2016 As of March 31, 2016Principal amount of Convertible Notes$— $163Unamortized debt discount of the liability component— (2)Net carrying value of Convertible Notes$— $161    Fair value of Convertible Notes (Level 2)$— $338                                                                                                                                                                                                                  |
| 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 ofSeptember 30, 2016 As ofMarch 31, 2016Senior Notes:   3.70% Senior Notes due 2021$600 $6004.80% Senior Notes due 2026400 400Total principal amount$1,000 $1,000Unaccreted discount(2) (2)Unamortized debt issuance costs(8) (9)Net carrying value of Senior Notes$990 $989    Fair value of Senior Notes (Level 2)$1,082 $1,039                                                                                                                                 |
| Schedule Of Interest Expense                                                                      | The following table summarizes our interest expense recognized for the three and six months ended September 30, 2016 and 2015 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):  Three Months Ended September 30, Six Months Ended September 30, 2016 2015 2016 2015Amortization of debt discount(1) (5) (2) (11)Amortization of debt issuance costs— — (1) (1)Coupon interest expense(10) (1) (21) (2)Total interest expense$(11) $(6) $(24) $(14) |

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