Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net Income (Loss) Attributable to Parent	$ 942.2	$ 1,436.3	$ 1,900.9	$ 2,577.9
Denominator:
Denominator for basic earnings per share — weighted average common shares	342.1	353.1	343.2	354.6
Effect of dilutive securities:
Employee stock awards (shares)	2.8	3.2	2.7	3.6
Denominator for diluted earnings per share — adjusted weighted average common shares	344.9	356.3	345.9	358.2
Basic net income per common share attributable to Parent (in dollars per share)	$ 2.75	$ 4.07	$ 5.54	$ 7.27
Diluted net income per common share attributable to Parent (in dollars per share)	$ 2.73	$ 4.03	$ 5.50	$ 7.20