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Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 31, 2017
Royalties and Licenses    
Royalty-related assets $ 109 $ 118
Other Current Assets    
Royalties and Licenses    
Royalty-related assets 71 79
Other assets    
Royalties and Licenses    
Royalty-related assets $ 38 $ 39