CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net income		$ 20,058	$ 19,743	$ 17,273
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Client incentives		15,751	13,764	12,297
Share-based compensation		897	850	765
Depreciation and amortization		1,220	1,034	943
Deferred income taxes		152	(100)	(483)
VE territory covered losses		(28)	(139)	(136)
(Gains) losses on equity investments, net		87	94	104
Other		94	136	14
Change in operating assets and liabilities:
Settlement receivable		374	(2,175)	(160)
Accounts receivable		(542)	(237)	(250)
Client incentives		(15,314)	(14,067)	(11,014)
Other assets		160	(199)	(24)
Accounts payable		67	109	34
Settlement payable		(847)	1,841	(194)
Accrued and other liabilities		(373)	(676)	1,291
Accrued litigation		1,303	(28)	295
Net cash provided by (used in) operating activities		23,059	19,950	20,755
Investing Activities
Purchases of property, equipment and technology		(1,482)	(1,257)	(1,059)
Purchases of investment securities		0	(4,443)	(4,363)
Proceeds from maturities and sales of investment securities		3,024	5,013	3,160
Acquisitions, net of cash and restricted cash acquired		(887)	(915)	0
Purchases of other investments		(68)	(231)	(121)
Proceeds from settlement of derivative instruments		0	0	402
Other investing activities		121	(93)	(25)
Net cash provided by (used in) investing activities		708	(1,926)	(2,006)
Financing Activities
Repurchases of class A common stock		(18,316)	(16,713)	(12,101)
Repayments of debt		0	0	(2,250)
Dividends paid		(4,634)	(4,217)	(3,751)
Proceeds from issuance of senior notes		3,924	0	0
Proceeds from stock issued under equity plans		396	335	260
Taxes paid related to stock issued under equity plans		(281)	(208)	(130)
Other financing activities		(52)	170	200
Net cash provided by (used in) financing activities		(18,963)	(20,633)	(17,772)
Effect of exchange rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents		420	382	636
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents		5,224	(2,227)	1,613
Cash, cash equivalents, restricted cash and restricted cash equivalents as of beginning of period		19,763	21,990	20,377
Cash, cash equivalents, restricted cash and restricted cash equivalents as of end of period		24,987	19,763	21,990
Supplemental Disclosure
Cash paid for income taxes, net	[1]	4,541	5,775	3,433
Interest payments on debt		587	583	617
Accruals related to purchases of property, equipment and technology		$ 59	$ 52	$ 96

[1] For fiscal 2025, the amount includes $1.9 billion of cash paid for federal transferable tax credits.