EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income for basic earnings per common share:
Net income	$ 818	$ 1,034	$ 857
Less allocation of earnings and dividends to participating securities	(1)	(2)	(1)
Net income attributable to RJF common shareholders	817	1,032	856
Income for diluted earnings per common share:
Net income	818	1,034	857
Less allocation of earnings and dividends to participating securities	(1)	(2)	(1)
Net income attributable to RJF common shareholders	$ 817	$ 1,032	$ 856
Common shares:
Average common shares in basic computation (in shares)	137.6	141.0	145.3
Dilutive effect of outstanding stock options and certain restricted stock units (in shares)	2.6	3.0	3.5
Average common shares used in diluted computation (in shares)	140.2	144.0	148.8
Earnings per common share:
Basic (in dollars per share)	$ 5.94	$ 7.32	$ 5.89
Diluted (in dollars per share)	$ 5.83	$ 7.17	$ 5.75
Stock options and certain restricted stock units excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares)	1.6	0.4	0.5
Dividends per common share declared and paid [Abstract]
Dividends per common share - declared (in dollars per share)	$ 1.48	$ 1.36	$ 1.10
Dividends per common share - paid (in dollars per share)	$ 1.45	$ 1.32	$ 1.02