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Royalties And Licenses (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2017
Royalties And Licenses      
Royalty-Based Asset Impairment Charge and Loss On Previously Minimum Unrecognized Royalty-Based Commitment $ 22 $ 22  
Developer/Licensor Commitments - Royalty Bearing Only      
Royalties And Licenses      
Unrecorded Unconditional Purchase Obligation     $ 987
Research And Development [Member]      
Royalties And Licenses      
Asset Impairment Charges 12 12  
Cost of service revenue [Member]      
Royalties And Licenses      
Business Exit Costs $ 10 $ 10