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Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Royalties and Licenses    
Royalty-related assets $ 48 $ 44
Other Current Assets    
Royalties and Licenses    
Royalty-related assets 26 24
Other assets    
Royalties and Licenses    
Royalty-related assets $ 22 $ 20