| **Fair Value Measurements**           | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Fair Value Measurements               | (2) FAIR VALUE MEASUREMENTSThere are various valuation techniques used to estimate fair value, the primary one being 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, 2014 and March 31, 2014, 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, 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 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 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 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  (a)The Deferred Compensation Plan assets consist of various mutual funds. See Note 15 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2014, for additional information regarding our Deferred Compensation Plan.(b)The immaterial contingent consideration as of December 31, 2014 represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisition of KlickNation Corporation (“KlickNation”) that is contingent upon the achievement of certain performance milestones. The $4 million contingent consideration as of March 31, 2014 represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisitions of 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, 2014 was 17 percent. The weighted average of the discount rates used during the fiscal year 2014 was 18 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, 2014 and March 31, 2014, the fair market value of acquisition-related contingent consideration was immaterial and $4 million, respectively, compared to a maximum potential payout of $3 million and $10 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, 2014, we made payments totaling $2 million to settle certain performance milestones achieved in connection with one of our acquisitions. During fiscal year 2014, we made payments of $4 million to settle certain performance milestones achieved in connection with two of our acquisitions. |

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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.
+ References
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