Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019
Royalties and Licenses
Royalty-related assets	$ 91	$ 83
Other Current Assets
Royalties and Licenses
Royalty-related assets	63	53
Other assets
Royalties and Licenses
Royalty-related assets	$ 28	$ 30