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Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Mar. 31, 2020
Royalties and Licenses    
Royalty-related assets $ 114 $ 99
Other Current Assets    
Royalties and Licenses    
Royalty-related assets 92 74
Other assets    
Royalties and Licenses    
Royalty-related assets $ 22 $ 25