| **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, 2016 As of March 31, 2016Other current assets$69 $54Other assets54 63Royalty-related assets$123 $117 |
| 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, 2016 As of March 31, 2016Accrued royalties$162 $159Other liabilities111 118Royalty-related liabilities$273 $277              |

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ROYALTIES AND LICENSES [Abstract]
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Schedule of royalty-related assets
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Schedule of royalty-related liabilities
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