CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Net revenue		$ 9,594	$ 8,775	$ 19,104	$ 17,409
Operating Expenses
Personnel		1,657	1,603	3,470	3,082
Marketing		381	338	687	631
Network and processing		224	189	431	370
Professional fees		173	160	316	291
Depreciation and amortization		305	249	587	496
General and administrative		419	452	900	792
Litigation provision		1,000	430	1,044	439
Total operating expenses		4,159	3,421	7,435	6,101
Operating income		5,435	5,354	11,669	11,308
Non-operating Income (Expense)
Interest expense		(158)	(82)	(340)	(269)
Investment income (expense) and other		161	241	309	516
Total non-operating income (expense)		3	159	(31)	247
Income before income taxes		5,438	5,513	11,638	11,555
Income tax provision		861	850	1,942	2,002
Net income		$ 4,577	$ 4,663	$ 9,696	$ 9,553
Class A common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)		$ 2.32	$ 2.29	$ 4.90	$ 4.68
Basic Weighted-average Shares Outstanding (in shares)		1,721	1,579	1,725	1,582
Diluted Earnings Per Share (in dollars per share)		$ 2.32	$ 2.29	$ 4.90	$ 4.68
Diluted Weighted-average Shares Outstanding (in shares)		1,974	2,039	1,979	2,042
Class B-1 common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)		$ 3.63	$ 3.63	$ 7.68	$ 7.44
Basic Weighted-average Shares Outstanding (in shares)		5	245	5	245
Diluted Earnings Per Share (in dollars per share)		$ 3.63	$ 3.63	$ 7.67	$ 7.43
Diluted Weighted-average Shares Outstanding (in shares)		5	245	5	245
Class B-2 common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)	[1]	$ 3.58	$ 0	$ 7.57	$ 0
Basic Weighted-average Shares Outstanding (in shares)	[1]	120	0	120	0
Diluted Earnings Per Share (in dollars per share)	[1]	$ 3.58	$ 0	$ 7.56	$ 0
Diluted Weighted-average Shares Outstanding (in shares)	[1]	120	0	120	0
Class C common stock
Earnings Per Share
Basic Earnings Per Share (in dollars per share)		$ 9.29	$ 9.16	$ 19.62	$ 18.73
Basic Weighted-average Shares Outstanding (in shares)		9	9	9	9
Diluted Earnings Per Share (in dollars per share)		$ 9.27	$ 9.15	$ 19.59	$ 18.71
Diluted Weighted-average Shares Outstanding (in shares)		9	9	9	9

[1] No shares of class B-2 common stock were outstanding prior to the class B-1 common stock exchange offer in May 2024. See Note 9—Stockholders’ Equity for further details.