Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net Income (Loss) Attributable to Parent	$ 630.7	$ 474.8	$ 1,544.7	$ 1,113.2
Denominator:
Denominator for basic earnings per share — weighted average common shares	363.8	372.3	366.0	373.5
Effect of dilutive securities:
Employee stock awards (shares)	3.9	4.6	4.4	4.7
Denominator for diluted earnings per share — adjusted weighted average common shares	367.7	376.9	370.4	378.2
Basic net income per common share attributable to Parent (in dollars per share)	$ 1.73	$ 1.28	$ 4.22	$ 2.98
Diluted net income per common share attributable to Parent (in dollars per share)	$ 1.72	$ 1.26	$ 4.17	$ 2.94