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Weighted-Average Common Shares (Tables)
12 Months Ended
Sep. 30, 2023
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):
2021 2022 2023 
Basic shares outstanding598.1 592.9 574.2 
Dilutive shares3.7 3.4 3.1 
     Diluted shares outstanding601.8 596.3 577.3