Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net Income (Loss) Attributable to Parent	$ 1,115.5	$ 630.7	$ 2,836.8	$ 1,544.7
Denominator:
Denominator for basic earnings per share — weighted average common shares	359.7	363.8	362.2	366.0
Effect of dilutive securities:
Employee stock awards (shares)	4.3	3.9	4.9	4.4
Denominator for diluted earnings per share — adjusted weighted average common shares	364.0	367.7	367.1	370.4
Basic net income per common share attributable to Parent (in dollars per share)	$ 3.10	$ 1.73	$ 7.83	$ 4.22
Diluted net income per common share attributable to Parent (in dollars per share)	$ 3.06	$ 1.72	$ 7.73	$ 4.17