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Weighted Average Common Shares (Tables)
12 Months Ended
Sep. 30, 2020
Weighted Average Number of Shares Outstanding, Diluted [Abstract]  
Schedule Of Basic And Diluted Earnings Per Common Share Reconciliation
Reconciliations of weighted-average shares for basic and diluted earnings per common share follow (shares in millions):
2018 2019 2020 
Basic shares outstanding632.0 616.2 602.9 
Dilutive shares3.3 4.4 3.7 
     Diluted shares outstanding635.3 620.6 606.6