Consolidated Statements of Total Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, Common	Non-controlling Interests
Beginning Balances at Sep. 30, 2020	$ 12,121.5	$ 3.9	$ 3,240.9	$ 9,757.8	$ (1,162.6)	$ 281.5
Increase (Decrease) in Stockholders' Equity
Net income	4,191.2			4,175.8		15.4
Exercise of stock options	6.6		6.6
Stock issued under employee incentive plans	16.2	0.1	16.1
Cash paid for shares withheld for taxes	(78.5)	0.0	(78.5)	0.0	0.0	0.0
Stock based compensation expense	91.4		91.4
Cash dividends declared	(289.3)			(289.3)
Repurchases of common stock	(874.0)				(874.0)
Distributions to noncontrolling interests	(0.1)					(0.1)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests	31.2		(1.7)			32.9
Ending Balances at Sep. 30, 2021	15,216.2	4.0	3,274.8	13,644.3	(2,036.6)	329.7
Increase (Decrease) in Stockholders' Equity
Net income	5,895.6			5,857.5		38.1
Exercise of stock options	7.0		7.0
Stock issued under employee incentive plans	26.2		26.2
Cash paid for shares withheld for taxes	(62.0)	0.0	(62.0)	0.0	0.0	0.0
Stock based compensation expense	105.1		105.1
Cash dividends declared	(316.5)			(316.5)
Repurchases of common stock	(1,105.9)				(1,105.9)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests	1.9		(1.6)			3.5
Noncontrolling Interest, Period Increase (Decrease)	18.0	0.0	0.0	0.0	0.0	18.0
Ending Balances at Sep. 30, 2022	19,785.6	4.0	3,349.5	19,185.3	(3,142.5)	389.3
Increase (Decrease) in Stockholders' Equity
Net income	4,795.2			4,745.7		49.5
Exercise of stock options	14.4	0.0	14.4
Stock issued under employee incentive plans	16.0		16.0
Cash paid for shares withheld for taxes	(56.1)	0.0	(56.1)	0.0	0.0	0.0
Stock based compensation expense	111.2		111.2
Cash dividends declared	(341.2)			(341.2)
Repurchases of common stock	(1,187.3)				(1,187.3)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests	0.1		(2.8)			2.9
Ending Balances at Sep. 30, 2023	$ 23,137.9	$ 4.0	$ 3,432.2	$ 23,589.8	$ (4,329.8)	$ 441.7