| **Fair Value Measurements (Tables)**                                    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Fair Value Disclosures [Abstract]**                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| Fair Value Assets And Liabilities Measured On Recurring Basis           | (a)The deferred compensation plan assets consist of various mutual funds.(b)The contingent consideration as of March 31, 2013 represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisitions of PopCap Games, Inc. (“PopCap”), KlickNation Corporation (“KlickNation”) and Chillingo Limited (“Chillingo”) that are contingent upon the achievement of certain performance milestones. The contingent consideration as of December 31, 2013 represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisitions of KlickNation and Chillingo that are contingent upon the achievement of certain performance milestones. We estimated the fair value of the acquisition-related contingent consideration payable using probability-weighted discounted cash flow models, and applied a discount rate that appropriately captures the risk associated with the obligation. The weighted average of the discount rates used during the nine months ended December 31, 2013 was 17 percent. The weighted average of the discount rates used during the fiscal year 2013 was 13 percent. The significant unobservable input used in the fair value measurement of the contingent consideration payable are forecasted earnings. Significant changes in forecasted earnings would result in a significantly higher or lower fair value measurement. At December 31, 2013 and March 31, 2013, the fair market value of acquisition-related contingent consideration totaled $2 million and $43 million, respectively, compared to a maximum potential payout of $10 million and $566 million, respectively.As of December 31, 2013 and March 31, 2013, our assets and liabilities that were measured and recorded at fair value on a recurring basis were as follows (in millions):    Fair Value Measurements at Reporting Date Using      Quoted Prices inActive Markets for IdenticalFinancialInstruments SignificantOtherObservableInputs SignificantUnobservableInputs   As ofDecember 31, 2013 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Money market funds$415 $415 $— $— Cash equivalentsAvailable-for-sale securities:         Corporate bonds168 — 168 — Short-term investmentsU.S. Treasury securities64 64 — — Short-term investmentsU.S. agency securities51 — 51 — Short-term investmentsCommercial paper49 — 49 — Short-term investments and cash equivalentsDeferred compensation plan assets (a)13 13 — — Other assetsForeign currency derivatives3 — 3 — Other current assetsTotal assets at fair value$763 $492 $271 $—  Liabilities         Contingent consideration (b)$2 $— $— $2 Accrued and other current liabilities and other liabilitiesForeign currency derivatives3 — 3 — Accrued and other current liabilitiesTotal liabilities at fair value$5 $— $3 $2     Fair Value Measurements at Reporting Date Using      Quoted Prices inActive Markets for IdenticalFinancialInstruments SignificantOtherObservableInputs SignificantUnobservableInputs   As of March 31, 2013 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Money market funds$469 $469 $— $— Cash equivalentsAvailable-for-sale securities:         Corporate bonds178 — 178 — Short-term investmentsU.S. agency securities91 — 91 — Short-term investments and cash equivalentsU.S. Treasury securities88 88 — — Short-term investments and cash equivalentsCommercial paper73 — 73 — Short-term investments and cash equivalentsDeferred compensation plan assets (a)11 11 — — Other assetsForeign currency derivatives6 — 6 — Other current assetsTotal assets at fair value$916 $568 $348 $—  Liabilities         Contingent consideration (b)$43 $— $— $43 Accrued and other current liabilities and other liabilitiesTotal liabilities at fair value$43 $— $— $43   |
| Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | (c)The change in fair value is reported as acquisition-related contingent consideration in our Condensed Consolidated Statements of Operations.(d)During the nine months ended December 31, 2013, we made payments totaling $4 million to settle certain performance milestones achieved in connection with one of our acquisitions. During fiscal year 2013, we made payments totaling $5 million to settle certain performance milestones achieved in connection with two of our acquisitions.   Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2013      $43  Change in fair value (c)      (37)  Payments (d)      (4)  Balance as of December 31, 2013      $2     Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2012      $112  Change in fair value (c)      (64)  Payment (d)      (5)  Balance as of March 31, 2013      $43                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Fair Value Measurements, Nonrecurring [Table Text Block]                | During the three and nine months ended December 31, 2013, our assets that were measured and recorded at fair value on a nonrecurring basis and the related impairments on those assets were as follows (in millions):   Fair Value Measurements Using     Net CarryingValue as ofDecember 31,  2013 Quoted Prices inActive Markets for Identical Assets SignificantOther Observable Inputs SignificantUnobservableInputs Total Impairments for the Three Months Ended December 31, 2013 Total Impairments for the Nine Months Ended December 31, 2013 (Level 1) (Level 2) (Level 3)  Assets           Royalty-based asset$— $— $— $— $— $17Total impairments recorded for non-recurring measurements on assets held as of December 31, 2013       $— $17During the nine months ended December 31, 2013, we became aware of facts and circumstances that indicated that the carrying value of one of our royalty-based assets was not recoverable. The impairment charge is included in cost of revenue on our Condensed Consolidated Statements of Operations.   Fair Value Measurements Using     Net Carrying Value as of December 31, 2012 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Impairments for the Three Months Ended December 31, 2012 Total Impairments for the Nine Months Ended December 31, 2012  (Level 1) (Level 2) (Level 3)  Assets           Acquisition-related intangible assets$15 $— $— $15 $6 $8Total impairments recorded for non-recurring measurements on assets held as of December 31, 2012       $6 $8During the three and nine months ended December 31, 2012, we became aware of facts and circumstances that indicated that the carrying value of some of our acquisition-related intangible assets were not recoverable. This impairment is included in cost of product revenue on our Condensed Consolidated Statement of Operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |

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| - Definition
Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).
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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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