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Consolidated Statements of Total Equity (Parenthetical) - shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity      
Beginning Balances,shares 374,986,079    
Issuances under employee benefit plans, shares 114,340 111,527 89,652
Ending Balances, shares 376,261,635 374,986,079  
Common Stock      
Increase (Decrease) in Stockholders' Equity      
Beginning Balances,shares 374,986,079 372,923,187 368,647,371
Issuances under employee benefit plans, shares 114,340 111,527 89,652
Exercise of stock options, shares 2,547,139 2,770,569 3,504,989
Issuances under employee incentive plans, shares 1,422,614 1,030,796 681,175
Treasury Stock, Shares, Acquired (2,808,537) (1,850,000)  
Ending Balances, shares 376,261,635 374,986,079 372,923,187