CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 974	$ 609
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	97	88
Deferred income taxes	(24)	(13)
Premium and discount amortization on available-for-sale securities and loss on other investments	12	53
Provisions/(benefits) for credit losses and legal and regulatory proceedings	(29)	209
Share-based compensation expense	103	97
Unrealized gain on company-owned life insurance policies, net of expenses	(159)	(10)
Losses on extinguishment of debt	98	0
Other	47	4
Net change in:
Assets segregated pursuant to regulations excluding cash and cash equivalents	(3,000)	0
Collateralized agreements, net of collateralized financings	(178)	(61)
Loans provided to financial advisors, net of repayments	(69)	(23)
Brokerage client receivables and other accounts receivable, net	(425)	126
Trading instruments, net	42	216
Derivative instruments, net	41	(68)
Other assets	(238)	(64)
Brokerage client payables and other accounts payable	4,673	1,621
Accrued compensation, commissions and benefits	160	(161)
Purchases and originations of loans held for sale, net of proceeds from sales of securitizations and loans held for sale	(1)	32
Net cash provided by operating activities	2,124	2,655
Cash flows from investing activities:
Additions to property and equipment	(99)	(97)
Increase in bank loans, net	(2,620)	(978)
Proceeds from sales of loans held for investment	248	272
Purchases of available-for-sale securities	(3,081)	(3,147)
Available-for-sale securities maturations, repayments and redemptions	1,658	744
Proceeds from sales of available-for-sale securities	969	222
Business acquisitions, net of cash acquired	(245)	(5)
Other investing activities, net	13	(31)
Net cash used in investing activities	(3,157)	(3,020)
Cash flows from financing activities:
Proceeds from senior notes issuances, net of debt issuance costs paid	737	494
Extinguishment of senior notes payable	(844)	0
Exercise of stock options and employee stock purchases	42	55
Increase in bank deposits	3,539	3,091
Purchases of treasury stock	(127)	(222)
Dividends on common stock	(163)	(154)
Other financing, net	(6)	(2)
Net cash provided by financing activities	3,149	3,258
Currency adjustment:
Effect of exchange rate changes on cash	114	(27)
Net increase in cash and cash equivalents, including those segregated pursuant to regulations	2,230	2,866
Cash and cash equivalents, including those segregated pursuant to regulations at beginning of year	9,634	5,971
Cash and cash equivalents, including those segregated pursuant to regulations at end of period	11,864	8,837
Cash and cash equivalents	5,982	5,632
Cash and cash equivalents segregated pursuant to regulations	5,882	3,205
Supplemental disclosures of cash flow information:
Cash paid for interest	113	118
Cash paid for income taxes, net	335	202
Cash outflows for lease liabilities	84	73
Non-cash right-of-use (“ROU”) assets recorded for new and modified leases	101	60
FHLB advances
Cash flows from financing activities:
Proceeds from Federal Home Loan Bank advances	0	850
Repayments of Federal Home Loan Bank advances and other borrowed funds	$ (29)	$ (854)