| **Fair Value Measurements**           | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Fair Value Measurements               | FAIR VALUE MEASUREMENTSThere are various valuation techniques used to estimate fair value, the primary of which is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability. We measure certain financial and nonfinancial assets and liabilities at fair value on a recurring and nonrecurring basis.Fair Value HierarchyThe three levels of inputs that may be used to measure fair value are as follows:•Level 1. Quoted prices in active markets for identical assets or liabilities.•Level 2. Observable inputs other than quoted prices included within Level 1, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities.•Level 3. Unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of assets or liabilities.Assets and Liabilities Measured at Fair Value on a Recurring BasisAs of December 31, 2012 and March 31, 2012, 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, 2012 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Money market funds$363 $363 $— $— Cash equivalentsAvailable-for-sale securities:         Corporate bonds149 — 149 — Short-term investmentsU.S. agency securities68 — 68 — Short-term investmentsMarketable equity securities59 59 — — Marketable equity securitiesU.S. Treasury securities56 56 — — Short-term investmentsCommercial paper3 — 3 — Short-term investments and cash equivalentsDeferred compensation plan assets (a)11 11 — — Other assetsForeign currency derivatives2 — 2 — Other current assetsTotal assets at fair value$711 $489 $222 $—  Liabilities         Contingent consideration (b)$42 $— $— $42 Accrued and other current liabilities and other liabilitiesTotal liabilities at fair value$42 $— $— $42      Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2012      $112  Change in fair value (c)      (65)  Payments (d)      (5)  Balance as of December 31, 2012      $42      Fair Value Measurements at Reporting Date Using      Quoted Prices inActive Markets for IdenticalFinancialInstruments SignificantOtherObservableInputs SignificantUnobservableInputs   As of March 31, 2012 (Level 1) (Level 2) (Level 3) Balance Sheet ClassificationAssets         Money market funds$490 $490 $— $— Cash equivalentsAvailable-for-sale securities:         U.S. Treasury securities170 170 — — Short-term investments and cash equivalentsCorporate bonds150 — 150 — Short-term investmentsMarketable equity securities119 119 — — Marketable equity securitiesU.S. agency securities116 — 116 — Short-term investmentsCommercial paper16 — 16 — Short-term investments and cash equivalentsDeferred compensation plan assets (a)11 11 — — Other assetsForeign currency derivatives2 — 2 — Other current assetsTotal assets at fair value$1,074 $790 $284 $—  Liabilities         Contingent consideration (b)$112 $— $— $112 Accrued and other current liabilities and other liabilitiesTotal liabilities at fair value$112 $— $— $112     Fair Value Measurements Using SignificantUnobservable Inputs (Level 3)         ContingentConsideration  Balance as of March 31, 2011      $51  Additions      100  Change in fair value (c)      11  Payment (d)      (25)  Reclassification (e)      (25)  Balance as of March 31, 2012      $112  (a)The deferred compensation plan assets consist of various mutual funds.(b)The contingent consideration as of December 31, 2012 and March 31, 2012 represents the estimated fair value of the additional variable cash consideration payable primarily 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. 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, 2012 and during the fiscal year 2012, was 12 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, 2012 and March 31, 2012, the fair market value of acquisition-related contingent consideration totaled $42 million and $112 million, respectively, compared to a maximum potential payout of $566 million and $572 million, respectively. (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, 2012, we made payments totaling $5 million to settle certain performance milestones achieved in connection with two of our acquisitions. During the fourth quarter of fiscal year 2012, we made a payment of $25 million to settle certain performance milestones achieved through December 31, 2011 in connection with our acquisition of Playfish Limited (“Playfish”).(e)During the fourth quarter of fiscal year 2012, we reclassified $25 million of contingent consideration in connection with our acquisition of Playfish to other current liabilities in our Condensed Consolidated Balance Sheet as the contingency was settled. This amount was paid during the second quarter of fiscal 2013.Assets and Liabilities Measured at Fair Value on a Nonrecurring BasisDuring the three and nine months ended December 31, 2012, our assets that were measured and recorded at fair value on a nonrecurring basis and the related impairments on those assets were as follows:    Fair Value Measurements at ReportingDate 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 nonrecurring 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. During the three and nine months ended December 31, 2011, there were no material impairment charges for assets and liabilities measured at fair value on a nonrecurring basis in periods subsequent to initial recognition. |

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| - Definition
The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.
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