| **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, 2015 and March 31, 2015 (in millions):  As of December 31, 2015 As of March 31, 2015 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$579 $— $(1) $578 $467 $— $— $467U.S. Treasury securities196 — (1) 195 214 — — 214U.S. agency securities154 — — 154 161 1 — 162Commercial paper39 — — 39 110 — — 110Short-term investments$968 $— $(2) $966 $952 $1 $— $953 |
| 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, 2015 and March 31, 2015 (in millions):  As of December 31, 2015 As of March 31, 2015 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$441 $441 $417 $417Due in 1-2 years306 305 281 281Due in 2-3 years221 220 244 245Due in 3-4 years— — 10 10Short-term investments$968 $966 $952 $953                                                                                                                                                                                                                                 |

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| - Definition
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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