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Financial Instruments (Tables)
6 Months Ended
Mar. 31, 2012
Financial Instruments Tables [Abstract]  
Fair Value By Balance Sheet Grouping
             
     Quoted Prices In Significant Other Significant
     Active Markets for Observable Unobservable
Financial Asset (Liability)   Identical Assets  Inputs Inputs
(in millions) Total Level 1 Level 2 Level 3
March 31, 2012            
Marketable securities $ 87 $ 87 $ - $ -
Derivatives   (2)   -   (2)   -
             
Total $ 85 $ 87 $ (2) $ -
             
September 30, 2011            
Marketable securities $ 68 $ 68 $ - $ -
Derivatives   (4)   -   (4)   -
             
Total $ 64 $ 68 $ (4) $ -