CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY), Condensed Statement of Cash Flows (Details) - 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:
Losses on extinguishment of debt	0	98	0
Other	49	66	92
Net change in:
Accrued compensation, commissions and benefits	(76)	416	70
Net cash provided by operating activities	72	6,647	4,073
Cash flows from investing activities:
Investment in note receivable	(125)	0	0
Net cash used in investing activities	(7,151)	(5,140)	(4,985)
Cash flows from financing activities:
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)
Proceeds from senior notes issuances, net of debt issuance costs paid	0	737	494
Extinguishment of senior notes payable	0	(844)	0
Net cash provided by financing activities	5,879	5,232	4,574
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 received for income taxes, net	524	437	246
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, par value $.01 per share
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
RJF Parent Company
Cash flows from operating activities:
Net income	1,509	1,403	818
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on investments	1	5	4
Unrealized (gain)/loss on company-owned life insurance policies, net of expenses	159	(157)	(50)
Equity in undistributed net income of subsidiaries	342	(1,333)	(134)
Losses on extinguishment of debt	0	98	0
Other	161	94	102
Net change in:
Intercompany receivables	(23)	(14)	126
Other assets	40	(35)	24
Intercompany payables	(18)	(14)	(70)
Other payables	3	38	43
Accrued compensation, commissions and benefits	(82)	202	73
Net cash provided by operating activities	2,092	287	936
Cash flows from investing activities:
Investments in subsidiaries	(1,092)	(420)	(106)
(Advances to)/repayments from subsidiaries, net	(723)	1,039	(885)
Investment in note receivable	(125)	0	0
Proceeds from sales of investments	7	2	9
Purchase of investments in company-owned life insurance policies, net	(63)	(36)	(55)
Net cash used in investing activities	(1,996)	585	(1,037)
Cash flows from financing activities:
Repurchases of common stock and share-based awards withheld for payment of withholding tax requirements	(216)	(151)	(291)
Dividends on preferred and common stock	(277)	(218)	(205)
Exercise of stock options and employee stock purchases	52	53	62
Proceeds from senior notes issuances, net of debt issuance costs paid	0	737	494
Extinguishment of senior notes payable	0	(844)	0
Net cash provided by financing activities	(441)	(423)	60
Net increase/(decrease) in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	(345)	449	(41)
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	1,004	555	596
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	659	1,004	555
Cash and cash equivalents	629	527	478
Cash and cash equivalents segregated for regulatory purposes and restricted cash	30	477	77
Supplemental disclosures of cash flow information:
Cash paid for interest	117	89	72
Cash received for income taxes, net	24	35	32
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
RJF Parent Company | Common stock, par value $.01 per share
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	778	0	0
RJF Parent Company | Preferred stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	$ 120	$ 0	$ 0