Royalties and Licenses (Schedule of Royalty-Related Assets) (Details) (USD $) In Millions	Mar. 31, 2011	Mar. 31, 2010
Royalty-related assets	$ 111	$ 102
Other Current Assets [Member]
Royalty-related assets	89	66
Other Non-Current Assets [Member]
Royalty-related assets	$ 22	$ 36