CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Net revenue		$ 35,926	$ 32,653	$ 29,310
Operating Expenses
Personnel		6,264	5,831	4,990
Marketing		1,560	1,341	1,336
Network and processing		778	736	743
Professional fees		635	545	505
Depreciation and amortization		1,034	943	861
General and administrative		1,598	1,330	1,194
Litigation provision		462	927	868
Total operating expenses		12,331	11,653	10,497
Operating income		23,595	21,000	18,813
Non-operating Income (Expense)
Interest expense		(641)	(644)	(538)
Investment income (expense) and other		962	681	(139)
Total non-operating income (expense)		321	37	(677)
Income before income taxes		23,916	21,037	18,136
Income tax provision		4,173	3,764	3,179
Net income		$ 19,743	$ 17,273	$ 14,957
Class A common stock
Earnings Per Share
Basic earnings per share (in dollars per share)		$ 9.74	$ 8.29	$ 7.01
Basic weighted-average shares outstanding (in shares)		1,621	1,618	1,651
Diluted earnings per share (in dollars per share)		$ 9.73	$ 8.28	$ 7.00
Diluted weighted-average shares outstanding (in shares)		2,029	2,085	2,136
Class B-1 common stock
Earnings Per Share
Basic earnings per share (in dollars per share)		$ 15.46	$ 13.26	$ 11.33
Basic weighted-average shares outstanding (in shares)		148	245	245
Diluted earnings per share (in dollars per share)		$ 15.45	$ 13.24	$ 11.31
Diluted weighted-average shares outstanding (in shares)		148	245	245
Class B-2 common stock
Earnings Per Share
Basic earnings per share (in dollars per share)	[1]	$ 15.45	$ 0	$ 0
Basic weighted-average shares outstanding (in shares)	[1]	49	0	0
Diluted earnings per share (in dollars per share)	[1]	$ 15.43	$ 0	$ 0
Diluted weighted-average shares outstanding (in shares)	[1]	49	0	0
Class C common stock
Earnings Per Share
Basic earnings per share (in dollars per share)		$ 38.97	$ 33.17	$ 28.03
Basic weighted-average shares outstanding (in shares)		16	10	10
Diluted earnings per share (in dollars per share)		$ 38.92	$ 33.13	$ 28.00
Diluted weighted-average shares outstanding (in shares)		16	10	10

[1] (1)No shares of class B-2 common stock were outstanding prior to the class B-1 common stock exchange offer. See Note 15—Stockholders’ Equity for further details.