|**Royalties And Licenses (Tables)**     | 6 Months Ended                                                                                                                                                                                                                                                                                           
|--------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Royalties And Licenses [Abstract]**   |                                                                                                                                                                                                                                                                                                          
|Schedule Of Royalty-Related Assets      | The current and long-term portions of prepaid royalties and minimum guaranteed royalty-related assets, included in other current assets and other assets, consisted of (in millions):As of September 30, 2015As of March 31, 2015Other current assets$63$70Other assets5059Royalty-related assets$113$129
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|                                        |                                                                                                                                                                                                                                                                                                          
|                                        | As of September 30, 2015                                                                                                                                                                                                                                                                                 
|Other current assets                    | $                                                                                                                                                                                                                                                                                                        
|Other assets                            | 50                                                                                                                                                                                                                                                                                                       
|Royalty-related assets                  | $                                                                                                                                                                                                                                                                                                        
|Schedule Of Royalty-Related Liabilities | The current and long-term portions of accrued royalties, included in accrued and other current liabilities and other liabilities, consisted of (in millions):As of September 30, 2015As of March 31, 2015Accrued royalties$166$119Other liabilities128131Royalty-related liabilities$294$250             
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|                                        |                                                                                                                                                                                                                                                                                                          
|                                        | As of September 30, 2015                                                                                                                                                                                                                                                                                 
|Accrued royalties                       | $                                                                                                                                                                                                                                                                                                        
|Other liabilities                       | 128                                                                                                                                                                                                                                                                                                      
|Royalty-related liabilities             | $                                                                                                                                                                                                                                                                                                        

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