CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY), Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 1,739	$ 1,509	$ 1,403
Adjustments to reconcile net income to net cash provided by operating activities:
Losses on extinguishment of debt	0	0	98
Other	10	49	66
Net change in:
Accrued compensation, commissions and benefits	123	(76)	416
Net cash provided by/(used in) operating activities	(3,514)	72	6,647
Cash flows from investing activities:
Investment in note receivable	0	(125)	0
Net cash used in investing activities	(274)	(7,151)	(5,140)
Cash flows from financing activities:
Repurchases of common stock and share-based awards withheld for payment of withholding tax requirements	(862)	(216)	(150)
Dividends on common and preferred stock	(355)	(277)	(218)
Proceeds from senior notes issuances, net of debt issuance costs paid	0	0	737
Extinguishment of senior notes payable	0	0	(844)
Net cash provided by financing activities	1,438	5,879	5,232
Net increase/(decrease) in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	(2,111)	(1,790)	6,815
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	14,659	16,449	9,634
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	12,548	14,659	16,449
Cash and cash equivalents	9,313	6,178	7,201
Cash and cash equivalents segregated for regulatory purposes and restricted cash	3,235	8,481	9,248
Total cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	12,548	14,659	16,449
Supplemental disclosures of cash flow information:
Cash paid for interest	1,310	323	145
Cash received for income taxes, net	565	524	437
Restricted stock awards issued as consideration for TriState Capital acquisition	0	28	0
Effective settlement of note receivable for TriState Capital acquisition	0	123	0
Common stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	0	778	0
Preferred stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	0	120	0
RJF Parent Company
Cash flows from operating activities:
Net income	1,739	1,509	1,403
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on investments	2	1	5
Unrealized (gain)/loss on company-owned life insurance policies, net of expenses	(95)	159	(157)
Equity in undistributed net income of subsidiaries	(555)	342	(1,333)
Losses on extinguishment of debt	0	0	98
Other	158	161	94
Net change in:
Intercompany receivables	1	(23)	(14)
Other assets	93	40	(35)
Intercompany payables	24	(18)	(14)
Other payables	34	3	38
Accrued compensation, commissions and benefits	164	(82)	202
Net cash provided by/(used in) operating activities	1,565	2,092	287
Cash flows from investing activities:
Investments in subsidiaries, net	(149)	(1,092)	(420)
(Advances to)/repayments from subsidiaries, net	(40)	(723)	1,039
Investment in note receivable	0	(125)	0
Proceeds from sales of investments	0	7	2
Purchase of investments in company-owned life insurance policies, net	(65)	(63)	(36)
Net cash used in investing activities	(254)	(1,996)	585
Cash flows from financing activities:
Repurchases of common stock and share-based awards withheld for payment of withholding tax requirements	(862)	(216)	(151)
Dividends on common and preferred stock	(355)	(277)	(218)
Redemption of preferred stock	(40)
Exercise of stock options and employee stock purchases	46	52	53
Proceeds from senior notes issuances, net of debt issuance costs paid	0	0	737
Extinguishment of senior notes payable	0	0	(844)
Net cash provided by financing activities	(1,211)	(441)	(423)
Net increase/(decrease) in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	100	(345)	449
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	659	1,004	555
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	759	659	1,004
Cash and cash equivalents	717	629	527
Cash and cash equivalents segregated for regulatory purposes and restricted cash	42	30	477
Total cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	759	659	1,004
Supplemental disclosures of cash flow information:
Cash paid for interest	65	117	89
Cash received for income taxes, net	9	24	35
Restricted stock awards issued as consideration for TriState Capital acquisition	0	28	0
Effective settlement of note receivable for TriState Capital acquisition	0	123	0
RJF Parent Company | Common stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	0	778	0
RJF Parent Company | Preferred stock
Supplemental disclosures of cash flow information:
Stock issued as consideration for TriState Capital acquisition	$ 0	$ 120	$ 0