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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator:        
Net Income (Loss) Attributable to Parent $ 810.4 $ 1,172.1 $ 1,655.3 $ 2,119.5
Denominator:        
Denominator for basic earnings per share — weighted average shares 312.5 330.9 317.0 332.1
Effect of dilutive securities:        
Employee stock awards (shares) 1.5 2.4 1.7 2.4
Denominator for diluted earnings per share — adjusted weighted average shares 314.0 333.3 318.7 334.5
Basic net income per common share attributable to Parent (in dollars per share) $ 2.59 $ 3.54 $ 5.22 $ 6.38
Diluted net income per common share attributable to Parent (in dollars per share) $ 2.58 $ 3.52 $ 5.19 $ 6.34