EARNINGS PER SHARE (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2021	Dec. 31, 2020 USD ($) $ / shares shares
Earnings Per Share [Abstract]
Stock split ratio		1.5
Stock dividend percent		50.00%
Income for basic earnings per common share:
Net income	$ 446		$ 312
Less allocation of earnings and dividends to participating securities	(1)		(1)
Net income attributable to RJF common shareholders	445		311
Income for diluted earnings per common share:
Net income	446		312
Less allocation of earnings and dividends to participating securities	(1)		(1)
Net income attributable to RJF common shareholders	$ 445		$ 311
Common shares:
Average common shares in basic computation (in shares) | shares	206.3		205.2
Dilutive effect of outstanding stock options and certain restricted stock units (in shares) | shares	6.1		4.4
Average common and common equivalent shares used in diluted computation (in shares) | shares	212.4		209.6
Earnings per common share:
Basic (in dollars per share) | $ / shares	$ 2.16		$ 1.52
Diluted (in dollars per share) | $ / shares	$ 2.10		$ 1.48
Stock options and certain RSUs excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares) | shares	0.0		2.1
Dividends per common share declared and paid: [Abstract]
Dividends per common share - declared (in dollars per share) | $ / shares	$ 0.34		$ 0.26
Dividends per common share - paid (in dollars per share) | $ / shares	$ 0.26		$ 0.25