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(Schedule Of Royalty-Related Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Royalties And Licenses [Line Items]    
Royalty-related assets $ 99 $ 83
Other Current Assets [Member]    
Royalties And Licenses [Line Items]    
Royalty-related assets 74 53
Other Assets [Member]    
Royalties And Licenses [Line Items]    
Royalty-related assets $ 25 $ 30