EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income for basic earnings per common share:
Net income	$ 169	$ 261	$ 437	$ 510
Less allocation of earnings and dividends to participating securities	0	0	(1)	0
Net income attributable to RJF common shareholders	169	261	436	510
Income for diluted earnings per common share:
Net income	169	261	437	510
Less allocation of earnings and dividends to participating securities	0	0	(1)	0
Net income attributable to RJF common shareholders	$ 169	$ 261	$ 436	$ 510
Common shares:
Average common shares in basic computation (in shares)	138.4	140.8	138.4	142.5
Dilutive effect of outstanding stock options and certain restricted stock units (in shares)	2.7	3.1	2.9	2.9
Average common shares used in diluted computation (in shares)	141.1	143.9	141.3	145.4
Earnings per common share:
Basic (in dollars per share)	$ 1.22	$ 1.85	$ 3.15	$ 3.58
Diluted (in dollars per share)	$ 1.20	$ 1.81	$ 3.09	$ 3.51
Stock options and certain restricted stock units excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares)	0.7	0.5	0.6	1.6
Dividends per common share declared and paid: [Abstract]
Dividends per common share - declared (in dollars per share)	$ 0.37	$ 0.34	$ 0.74	$ 0.68
Dividends per common share - paid (in dollars per share)	$ 0.37	$ 0.34	$ 0.71	$ 0.64