v3.26.1
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net Income (Loss) Attributable to Parent $ 904.9 $ 1,024.6 $ 2,147.6 $ 2,679.9
Denominator:        
Denominator for basic earnings per share — weighted average shares 282.2 304.1 287.5 312.7
Effect of dilutive securities:        
Employee stock awards (shares) 0.8 0.8 0.9 1.4
Denominator for diluted earnings per share — adjusted weighted average shares 283.0 304.9 288.4 314.1
Basic net income per common share attributable to Parent (in dollars per share) $ 3.21 $ 3.37 $ 7.47 $ 8.57
Diluted net income per common share attributable to Parent (in dollars per share) $ 3.20 $ 3.36 $ 7.45 $ 8.53
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   1.2   0.8