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Weighted Average Common Shares (Tables)
12 Months Ended
Sep. 30, 2011
Weighted Average Common Shares [Abstract] 
Schedule Of Basic And Diluted Earnings Per Common Share Reconciliation
                         
(SHARES IN MILLIONS)
 
2009
   
2010
   
2011
 
Basic shares outstanding
    753.7       750.7       748.5  
Dilutive shares
    5.0       6.3       5.0  
Diluted shares outstanding
    758.7       757.0       753.5