| **Financial Instruments (Tables)**                                    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as of December 31, 2016 and March 31, 2016 (in millions):  As of December 31, 2016 As of March 31, 2016 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$842 $— $(2) $840 $620 $1 $— $621U.S. Treasury securities400 — (1) 399 389 1 — 390U.S. agency securities163 — (1) 162 167 — — 167Commercial paper116 — — 116 50 — — 50Foreign government securities124 — — 124 113 — — 113Asset-backed securities95 — — 95 — — — —Short-term investments$1,740 $— $(4) $1,736 $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 December 31, 2016 and March 31, 2016 (in millions):  As of December 31, 2016 As of March 31, 2016 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$928 $928 $571 $571Due in 1-2 years419 418 461 462Due in 2-3 years306 304 295 296Due in 3-4 years87 86 12 12Short-term investments$1,740 $1,736 $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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