| **Financial Instruments (Tables)**                                    | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| **Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as of September 30, 2016 and March 31, 2016 (in millions):  As of September 30, 2016 As of March 31, 2016 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$738 $1 $— $739 $620 $1 $— $621U.S. Treasury securities378 1 — 379 389 1 — 390U.S. agency securities154 — — 154 167 — — 167Commercial paper79 — — 79 50 — — 50Foreign government securities115 — — 115 113 — — 113Asset-backed securities54 — — 54 — — — —Short-term investments$1,518 $2 $— $1,520 $1,339 $2 $— $1,341 |
| 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 September 30, 2016 and March 31, 2016 (in millions):  As of September 30, 2016 As of March 31, 2016 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$749 $749 $571 $571Due in 1-2 years415 416 461 462Due in 2-3 years295 296 295 296Due in 3-4 years59 59 12 12Short-term investments$1,518 $1,520 $1,339 $1,341                                                                                                                                                                                                                                                                                                                                                                                                                                                           |

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Amortized Cost And Fair Value Of Short-Term Investments By Stated Maturity Date [Table Text Block]
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FINANCIAL INSTRUMENTS [Abstract]
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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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