| **Fair Value Measurements (Tables)**                                    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Fair Value Disclosures [Abstract]**                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Fair Value Assets And Liabilities Measured On Recurring Basis           |    Fair Value Measurements at Reporting Date Using      Quoted Prices inActive Markets for IdenticalFinancialInstruments SignificantOtherObservableInputs SignificantUnobservableInputs   As ofDecember 31, 2014 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Bank and time deposits$98 $98 $— $— Cash equivalentsMoney market funds2 2 — — Cash equivalentsAvailable-for-sale securities:         Corporate bonds398 — 398 — Short-term investmentsU.S. Treasury securities170 170 — — Short-term investments and cash equivalentsU.S. agency securities126 — 126 — Short-term investmentsCommercial paper108 — 108 — Short-term investments and cash equivalentsForeign currency derivatives15 — 15 — Other current assetsDeferred compensation plan assets (a)10 10 — — Other assetsTotal assets at fair value$927 $280 $647 $—  Liabilities         Contingent consideration (b)$— $— $— $— Accrued and other current liabilitiesForeign currency derivatives9 — 9 — Accrued and other current liabilitiesDeferred compensation plan liabilities10 10 — — Other liabilitiesTotal liabilities at fair value$19 $10 $9 $—     Fair Value Measurements at Reporting Date Using      Quoted Prices inActive Markets for IdenticalFinancialInstruments SignificantOtherObservableInputs SignificantUnobservableInputs   As of March 31, 2014 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Money market funds$588 $588 $— $— Cash equivalentsAvailable-for-sale securities:         Corporate bonds279 — 279 — Short-term investmentsCommercial paper146 — 146 — Short-term investments and cash equivalentsU.S. Treasury securities118 118 — — Short-term investments and cash equivalentsU.S. agency securities89 — 89 — Short-term investments and cash equivalentsDeferred compensation plan assets (a)9 9 — — Other assetsTotal assets at fair value$1,229 $715 $514 $—  Liabilities         Contingent consideration (b)$4 $— $— $4 Accrued and other current liabilities and other liabilitiesForeign currency derivatives6 — 6 — Accrued and other current liabilitiesDeferred compensation plan liabilities9 9 — — Other liabilitiesTotal liabilities at fair value$19 $9 $6 $4   |
| Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |    Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2014      $4  Change in fair value (c)      (2)  Payments (d)      (2)  Balance as of December 31, 2014 (b)      $—     Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2013      $43  Change in fair value (c)      (35)  Payment (d)      (4)  Balance as of March 31, 2014 (b)      $4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |

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| - Definition
Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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| - Definition
Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.
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