EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income for basic earnings per common share:
Net income	$ 172	$ 259	$ 609	$ 769
Less allocation of earnings and dividends to participating securities	0	(1)	(1)	(1)
Net income attributable to RJF common shareholders	172	258	608	768
Income for diluted earnings per common share:
Net income	172	259	609	769
Less allocation of earnings and dividends to participating securities	0	(1)	(1)	(1)
Net income attributable to RJF common shareholders	$ 172	$ 258	$ 608	$ 768
Common shares:
Average common shares in basic computation (in shares)	137.1	140.4	137.9	141.8
Dilutive effect of outstanding stock options and certain restricted stock units (in shares)	2.3	3.2	2.6	3.0
Average common shares used in diluted computation (in shares)	139.4	143.6	140.5	144.8
Earnings per common share:
Basic (in dollars per share)	$ 1.25	$ 1.84	$ 4.41	$ 5.42
Diluted (in dollars per share)	$ 1.23	$ 1.80	$ 4.33	$ 5.30
Stock options and certain restricted stock units excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares)	1.8	0.2	1.6	0.5
Dividends per common share declared and paid: [Abstract]
Dividends per common share - declared (in dollars per share)	$ 0.37	$ 0.34	$ 1.11	$ 1.02
Dividends per common share - paid (in dollars per share)	$ 0.37	$ 0.34	$ 1.08	$ 0.98