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Weighted Average Common Shares
 12 Months Ended
Sep. 30, 2020
Weighted Average Number of Shares Outstanding, Diluted [Abstract]  
Weighted Average Common Shares WEIGHTED-AVERAGE COMMON SHARES
Basic earnings per common share consider only the weighted-average of common shares outstanding while diluted earnings per common share also consider the dilutive effects of stock options and incentive shares. An inconsequential number of shares of common stock were excluded from the computation of dilutive earnings per share in 2020, 2019 and 2018 as the effect would have been antidilutive. Earnings allocated to participating securities were inconsequential for all years presented.

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