Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016
Royalties and Licenses
Royalty-related assets	$ 123	$ 117
Other Current Assets
Royalties and Licenses
Royalty-related assets	69	54
Other assets
Royalties and Licenses
Royalty-related assets	$ 54	$ 63