CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income	$ 3,959	$ 3,126
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Client incentives	2,371	1,858
Share-based compensation	128	122
Depreciation and amortization of property, equipment, technology and intangible assets	198	197
Deferred income taxes	(15)	5
VE territory covered losses incurred	(7)	(10)
(Gains) losses on equity investments, net	(231)	(16)
Other	(32)	41
Change in operating assets and liabilities:
Settlement receivable	(76)	(244)
Accounts receivable	(213)	(108)
Client incentives	(2,339)	(1,485)
Other assets	(163)	235
Accounts payable	(9)	(39)
Settlement payable	409	194
Accrued and other liabilities	206	(357)
Accrued litigation	46	(6)
Net cash provided by (used in) operating activities	4,232	3,513
Investing Activities
Purchases of property, equipment and technology	(173)	(160)
Investment securities:
Purchases	(951)	(1,315)
Proceeds from maturities and sales	1,374	2,163
Acquisitions, net of cash acquired	(832)	(75)
Purchases of / contributions to other investments	(37)	(18)
Other investing activities	72	44
Net cash provided by (used in) investing activities	(547)	639
Financing Activities
Repurchase of class A common stock	(4,104)	(1,796)
Repayments of debt	0	(3,000)
Dividends paid	(809)	(703)
Cash proceeds from issuance of class A common stock under employee equity plans	59	61
Restricted stock and performance-based shares settled in cash for taxes	(113)	(134)
Net cash provided by (used in) financing activities	(4,967)	(5,572)
Effect of exchange rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	(194)	304
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	(1,476)	(1,116)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	19,799	19,171
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	18,323	18,055
Supplemental Disclosure
Cash paid for income taxes, net	268	252
Interest payments on debt	244	281
Accruals related to purchases of property, equipment and technology	$ 53	$ 13