CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY), Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 1,403	$ 818	$ 1,034
Adjustments to reconcile net income to net cash provided by operating activities:
Losses on extinguishment of debt	98	0	0
Other	66	92	51
Net change in:
Accrued compensation, commissions and benefits	416	70	80
Net cash provided by operating activities	6,625	4,054	577
Cash flows from investing activities:
Net cash used in investing activities	(5,140)	(4,985)	(1,897)
Cash flows from financing activities:
Purchases of treasury stock	(128)	(272)	(778)
Dividends on common stock	(218)	(205)	(191)
Proceeds from senior notes issuances, net of debt issuance costs paid	737	494	0
Extinguishment of senior notes payable	(844)	0	0
Proceeds from borrowings on the RJF Credit Facility	0	0	300
Repayment of borrowings on the RJF Credit Facility	0	0	(300)
Net cash provided by financing activities	5,254	4,593	1,373
Net increase in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	6,815	3,663	30
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	9,634	5,971	5,941
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	16,449	9,634	5,971
Cash and cash equivalents	7,201	5,390	3,957
Cash and cash equivalents segregated for regulatory purposes and restricted cash	9,248	4,244	2,014
Supplemental disclosures of cash flow information:
Cash paid for interest	145	164	283
Cash received for income taxes, net	437	246	390
RJF Parent Company
Cash flows from operating activities:
Net income	1,403	818	1,034
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on investments	5	4	4
Unrealized gain on company-owned life insurance policies, net of expenses	(157)	(50)	(5)
Equity in undistributed net income of subsidiaries	(1,333)	(134)	(292)
Losses on extinguishment of debt	98	0	0
Other	94	102	100
Net change in:
Intercompany receivables	(14)	126	(51)
Other assets	(35)	24	(16)
Intercompany payables	(14)	(70)	(22)
Other payables	15	24	(1)
Accrued compensation, commissions and benefits	202	73	34
Net cash provided by operating activities	264	917	785
Cash flows from investing activities:
Investments in subsidiaries	(420)	(106)	(24)
(Advances to)/repayments from subsidiaries, net	1,039	(885)	63
Proceeds from sales of investments	2	9	3
Purchase of investments in company-owned life insurance policies, net	(36)	(55)	(44)
Net cash used in investing activities	585	(1,037)	(2)
Cash flows from financing activities:
Purchases of treasury stock	(128)	(272)	(778)
Dividends on common stock	(218)	(205)	(191)
Exercise of stock options and employee stock purchases	53	62	65
Proceeds from senior notes issuances, net of debt issuance costs paid	737	494	0
Extinguishment of senior notes payable	(844)	0	0
Net cash provided by financing activities	(400)	79	(904)
Net increase in cash and cash equivalents, including those segregated for regulatory purposes and restricted cash	449	(41)	(121)
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at beginning of year	555	596	717
Cash and cash equivalents, including those segregated for regulatory purposes and restricted cash at end of year	1,004	555	596
Cash and cash equivalents	527	478	540
Cash and cash equivalents segregated for regulatory purposes and restricted cash	477	77	56
Supplemental disclosures of cash flow information:
Cash paid for interest	89	72	78
Cash received for income taxes, net	35	32	42
Supplemental disclosures of noncash investing activity:
Investments in subsidiaries, net	0	0	(43)
RJF Credit Facility | RJF Parent Company
Cash flows from financing activities:
Proceeds from borrowings on the RJF Credit Facility	0	0	300
Repayment of borrowings on the RJF Credit Facility	$ 0	$ 0	$ (300)