Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net Income (Loss) Attributable to Parent	$ 1,436.3	$ 929.5	$ 2,577.9	$ 1,721.3
Denominator:
Denominator for basic earnings per share — weighted average common shares	353.1	362.3	354.6	363.4
Effect of dilutive securities:
Employee stock awards (shares)	3.2	4.9	3.6	5.2
Denominator for diluted earnings per share — adjusted weighted average common shares	356.3	367.2	358.2	368.6
Basic net income per common share attributable to Parent (in dollars per share)	$ 4.07	$ 2.57	$ 7.27	$ 4.74
Diluted net income per common share attributable to Parent (in dollars per share)	$ 4.03	$ 2.53	$ 7.20	$ 4.67