| **Financial Instruments (Tables)**                                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as of March 31, 2014 and 2013 (in millions): As of March 31, 2014 As of March 31, 2013 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$279 $— $— $279 $177 $1 $— $178U.S. Treasury securities114 — — 114 85 — — 85Commercial paper110 — — 110 49 — — 49U.S. agency securities80 — — 80 76 — — 76Short-term investments$583 $— $— $583 $387 $1 $— $388 |
| Fair Value Of Short-Term Investments By Stated Maturity Date Schedule | The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of March 31, 2014 and 2013 (in millions): As of March 31, 2014 As of March 31, 2013 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$318 $318 $160 $160Due in 1-2 years156 156 126 127Due in 2-3 years104 104 101 101Due in 3-4 years5 5 — —Short-term investments$583 $583 $387 $388                                                                                                                                                                                                                                         |
| Carrying Value And Fair Value Of Convertible Senior Notes             | The following table summarizes the carrying value and fair value of our 0.75% Convertible Senior Notes due 2016 as of March 31, 2014 and 2013 (in millions):  As of March 31, 2014 As of March 31, 2013 CarryingValue FairValue CarryingValue FairValue0.75% Convertible Senior Notes due 2016$580 $731 $559 $614                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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Amortized Cost And Fair Value Of Short-Term Investments By Stated Maturity Date [Table Text Block]
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Schedule of convertible senior notes [Table Text Block]
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Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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