|**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, 2017As of March 31, 2017Other current assets$47$79Other assets3839Royalty-related assets$85$118
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|                                        |                                                                                                                                                                                                                                                                                                         
|                                        | As of September 30, 2017                                                                                                                                                                                                                                                                                
|Other current assets                    | $                                                                                                                                                                                                                                                                                                       
|Other assets                            | 38                                                                                                                                                                                                                                                                                                      
|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, 2017As of March 31, 2017Accrued royalties$183$165Other liabilities8597Royalty-related liabilities$268$262              
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|                                        |                                                                                                                                                                                                                                                                                                         
|                                        | As of September 30, 2017                                                                                                                                                                                                                                                                                
|Accrued royalties                       | $                                                                                                                                                                                                                                                                                                       
|Other liabilities                       | 85                                                                                                                                                                                                                                                                                                      
|Royalty-related liabilities             | $                                                                                                                                                                                                                                                                                                       

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