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Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) (USD $)
In Millions
Sep. 30, 2011
Mar. 31, 2011
Royalty Related Assets [Line Items]  
Royalty-related assets$ 183$ 111
Other Assets [Member]
  
Royalty Related Assets [Line Items]  
Royalty-related assets10922
Other Current Assets [Member]
  
Royalty Related Assets [Line Items]  
Royalty-related assets$ 74$ 89