Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net Income (Loss) Attributable to Parent	$ 1,024.6	$ 1,353.6	$ 2,679.9	$ 3,473.0
Denominator:
Denominator for basic earnings per share — weighted average shares	304.1	328.4	312.7	330.9
Effect of dilutive securities:
Employee stock awards (shares)	0.8	1.7	1.4	2.1
Denominator for diluted earnings per share — adjusted weighted average shares	304.9	330.1	314.1	333.0
Basic net income per common share attributable to Parent (in dollars per share)	$ 3.37	$ 4.12	$ 8.57	$ 10.50
Diluted net income per common share attributable to Parent (in dollars per share)	$ 3.36	$ 4.10	$ 8.53	$ 10.43
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.2		0.8