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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share Reconciliation [Abstract]      
Net Income (Loss) Attributable to Parent $ 3,585.2 $ 4,756.4 $ 4,745.7
Denominator:      
Denominator for basic earnings per share - weighted average common shares 308.5 329.5 340.7
Effect of dilutive securities:      
Employee stock awards 1.4 2.1 2.6
Denominator for diluted earnings per share - adjusted weighted average common shares 309.9 331.6 343.3
Earnings Per Share, Basic $ 11.62 $ 14.44 $ 13.93
Earnings Per Share, Diluted $ 11.57 $ 14.34 $ 13.82