EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income for basic earnings per common share:
Net income	$ 307	$ 172	$ 974	$ 609
Less allocation of earnings and dividends to participating securities	0	0	(1)	(1)
Net income attributable to RJF common shareholders	307	172	973	608
Income for diluted earnings per common share:
Net income	307	172	974	609
Less allocation of earnings and dividends to participating securities	0	0	(1)	(1)
Net income attributable to RJF common shareholders	$ 307	$ 172	$ 973	$ 608
Common shares:
Average common shares in basic computation (in shares)	137.2	137.1	137.2	137.9
Dilutive effect of outstanding stock options and certain restricted stock units (in shares)	3.9	2.3	3.4	2.6
Average common and common equivalent shares used in diluted computation (in shares)	141.1	139.4	140.6	140.5
Earnings per common share:
Basic (in dollars per share)	$ 2.24	$ 1.25	$ 7.09	$ 4.41
Diluted (in dollars per share)	$ 2.18	$ 1.23	$ 6.92	$ 4.33
Stock options and certain RSUs excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares)	0.0	1.8	0.1	1.6
Dividends per common share declared and paid: [Abstract]
Dividends per common share - declared (in dollars per share)	$ 0.39	$ 0.37	$ 1.17	$ 1.11
Dividends per common share - paid (in dollars per share)	$ 0.39	$ 0.37	$ 1.15	$ 1.08