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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Numerator:        
Net Income (Loss) Attributable to Parent $ 1,172.1 $ 942.2 $ 2,119.5 $ 1,900.9
Denominator:        
Denominator for basic earnings per share — weighted average common shares 330.9 342.1 332.1 343.2
Effect of dilutive securities:        
Employee stock awards (shares) 2.4 2.8 2.4 2.7
Denominator for diluted earnings per share — adjusted weighted average common shares 333.3 344.9 334.5 345.9
Basic net income per common share attributable to Parent (in dollars per share) $ 3.54 $ 2.75 $ 6.38 $ 5.54
Diluted net income per common share attributable to Parent (in dollars per share) $ 3.52 $ 2.73 $ 6.34 $ 5.50