| **Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2014                                                                                                     | Mar. 31, 2014                                                                                                     |
|--------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------|
| **Royalties and Licenses**                                                                                               |                                                                                                              |                                                                                                              |
| Royalty-related assets                                                                                                   | $ 69ea_RoyaltyRelatedAssetsCurrentAndNoncurrent                                                                   | $ 155ea_RoyaltyRelatedAssetsCurrentAndNoncurrent                                                                  |
| Other Current Assets                                                                                                     |                                                                                                              |                                                                                                              |
| **Royalties and Licenses**                                                                                               |                                                                                                              |                                                                                                              |
| Royalty-related assets                                                                                                   | 53ea_RoyaltyRelatedAssetsCurrentAndNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherCurrentAssetsMember | 97ea_RoyaltyRelatedAssetsCurrentAndNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherCurrentAssetsMember |
| Other assets                                                                                                             |                                                                                                              |                                                                                                              |
| **Royalties and Licenses**                                                                                               |                                                                                                              |                                                                                                              |
| Royalty-related assets                                                                                                   | $ 16ea_RoyaltyRelatedAssetsCurrentAndNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember      | $ 58ea_RoyaltyRelatedAssetsCurrentAndNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember      |

| X                                                                                                                                                                                                                                                                       |
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| - Definition
Royalty Related Assets Current And Noncurrent
+ References
No definition available.
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| X                                                                                                                                                         |
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