CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 1,509	$ 1,403	$ 818
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	145	134	119
Deferred income taxes, net	(16)	(37)	(39)
Premium and discount amortization on available-for-sale securities and bank loans and net unrealized gain/loss on other investments	23	15	57
Provisions/(benefits) for credit losses and legal and regulatory proceedings	111	(20)	257
Share-based compensation expense	192	132	120
Unrealized (gain)/loss on company-owned life insurance policies, net of expenses	174	(150)	(46)
Losses on extinguishment of debt	0	98	0
Other	49	66	92
Net change in:
Assets segregated for regulatory purposes excluding cash and cash equivalents	2,100	(2,100)	0
Collateralized agreements, net of collateralized financings	(37)	(29)	(55)
Loans provided to financial advisors, net of repayments	(120)	(90)	(49)
Brokerage client receivables and other receivables, net	(203)	(420)	127
Trading instruments, net	48	(141)	150
Derivative instruments, net	479	53	(51)
Other assets	(126)	16	(13)
Brokerage client payables and other payables	(4,213)	7,306	2,505
Accrued compensation, commissions and benefits	(76)	416	70
Purchases and originations of loans held for sale, net of proceeds from sales of securitizations and loans held for sale	33	(5)	11
Net cash provided by operating activities	72	6,647	4,073
Cash flows from investing activities:
Increase in bank loans, net	(7,235)	(4,027)	(1,136)
Proceeds from sales of loans held for investment	213	287	634
Purchases of available-for-sale securities	(3,069)	(4,218)	(5,710)
Available-for-sale securities maturations, repayments and redemptions	1,712	2,181	1,188
Proceeds from sales of available-for-sale securities	52	969	222
Cash and cash equivalents acquired in business acquisitions, including those segregated for regulatory purposes, net of cash paid for acquisitions	1,461	(266)	(5)
Additions to property and equipment	(91)	(74)	(124)
Investment in note receivable	(125)	0	0
(Purchases)/sales of other investments, net	24	27	5
Other investing activities, net	(93)	(19)	(59)
Net cash used in investing activities	(7,151)	(5,140)	(4,985)
Cash flows from financing activities:
Proceeds from senior notes issuances, net of debt issuance costs paid	0	737	494
Extinguishment of senior notes payable	0	(844)	0
Increase in bank deposits	6,269	5,694	4,520
Repurchases of common stock and share-based awards withheld for payment of withholding tax requirements	(216)	(150)	(291)
Dividends on preferred and common stock	(277)	(218)	(205)
Exercise of stock options and employee stock purchases	52	53	62
Proceeds from Federal Home Loan Bank advances	1,025	0	850
Repayments of Federal Home Loan Bank advances and other borrowed funds	(967)	(31)	(855)
Other financing, net	(7)	(9)	(1)
Net cash provided by financing activities	5,879	5,232	4,574
Currency adjustment:
Effect of exchange rate changes on cash and cash equivalents, including those segregated for regulatory purposes	(590)	76	1
Net increase/(decrease) in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	(1,790)	6,815	3,663
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	16,449	9,634	5,971
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	14,659	16,449	9,634
Cash and cash equivalents	6,178	7,201	5,390
Cash and cash equivalents segregated for regulatory purposes and restricted cash	8,481	9,248	4,244
Supplemental disclosures of cash flow information:
Cash paid for interest	323	145	164
Cash paid for income taxes, net	524	437	246
Cash outflows for lease liabilities	111	110	101
Non-cash right-of-use assets recorded for new and modified leases	68	168	74
Restricted stock awards issued as consideration for TriState Capital acquisition	28	0	0
Effective settlement of note receivable for TriState Capital acquisition	123	0	0
Common stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	778	0	0
Preferred stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	$ 120	$ 0	$ 0