Royalties And Licenses (Schedule Of Royalty-Related Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 170	$ 173
Accrued royalties [Member]
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	103	98
Other accrued expenses [Member]
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	21	23
Other Liabilities [Member]
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 46	$ 52