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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Weighted Average Discount Rate 13.00% 12.00%
Contingent consideration maximum payment $ 566 $ 572
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 916 1,074
Total liability at fair value 43 112
Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 568 790
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 348 284
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liability at fair value 43 112
Cash Equivalents [Member] | Fair Value [Member] | Money Market Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Cash equivalents 469 490
Cash Equivalents [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) [Member] | Money Market Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Cash equivalents 469 490
Short-Term Investments And Cash Equivalents [Member] | Fair Value [Member] | U.S. Agency Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 91  
Short-Term Investments And Cash Equivalents [Member] | Fair Value [Member] | U.S. Treasury Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 88 170
Short-Term Investments And Cash Equivalents [Member] | Fair Value [Member] | Commercial Paper [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 73 16
Short-Term Investments And Cash Equivalents [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) [Member] | U.S. Treasury Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 88 170
Short-Term Investments And Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 91  
Short-Term Investments And Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 73 16
Short-Term Investments [Member] | Fair Value [Member] | Corporate Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 178 150
Short-Term Investments [Member] | Fair Value [Member] | U.S. Agency Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities   116
Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities 178 150
Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities   116
Other Assets [Member] | Fair Value [Member] | Deferred Compensation Plan Assets [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation plan assets 11 [1] 11 [1]
Other Assets [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) [Member] | Deferred Compensation Plan Assets [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation plan assets 11 [1] 11 [1]
Other Current Assets [Member] | Fair Value [Member] | Foreign Currency Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency derivatives 6 2
Other Current Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency derivatives 6 2
Marketable Equity Securities [Member] | Fair Value [Member] | Marketable Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities   119
Marketable Equity Securities [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) [Member] | Marketable Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, Available-for-sale securities   119
Accrued And Other Current Liabilities And Other Liabilities [Member] | Fair Value [Member] | Contingent Consideration [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration 43 [2] 112 [2]
Accrued And Other Current Liabilities And Other Liabilities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration $ 43 [2] $ 112 [2]
[1] The deferred compensation plan assets consist of various mutual funds.
[2] The contingent consideration as of March 31, 2013 and 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 is 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 a market participant’s view of the risk associated with the obligations. During fiscal year 2013, the discount rate used had a weighted average of 13 percent. During fiscal year 2012, the discount rate used had a weighted average of 12 percent. The significant unobservable input used in the fair value measurement of the acquisition-related contingent consideration payable is forecasted earnings. Significant changes in forecasted earnings would result in a significantly higher or lower fair value measurement. At March 31, 2013 and 2012, the fair market value of acquisition-related contingent consideration totaled $43 million and $112 million, respectively, compared to a maximum potential payout of $566 million and $572 million, respectively.