SEGMENT INFORMATION, Information Concerning Operations (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) businessSegment	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | businessSegment	5
Net revenues:
Net revenues	$ 9,760	$ 7,990	$ 7,740
Pre-tax income/(loss):
Total pre-tax income	1,791	1,052	1,375
Net interest income (expense):
Net interest income	673	822	998
Total assets:
Aggregate assets	61,891	47,482
Goodwill and Intangible Assets:
Goodwill	660	466	464
Goodwill additions	193
NWPS
Goodwill and Intangible Assets:
Goodwill additions	139
Financo
Goodwill and Intangible Assets:
Goodwill additions	30
Cebile
Goodwill and Intangible Assets:
Goodwill additions	24
Private Client Group
Goodwill and Intangible Assets:
Goodwill	417	277	275
Goodwill additions	139
Capital Markets
Goodwill and Intangible Assets:
Goodwill	174	120	120
Goodwill additions	54
Asset Management
Goodwill and Intangible Assets:
Goodwill	69	69	69
Goodwill additions	0
Other
Net interest income (expense):
Net interest income	(88)	(58)	(12)
Operating segments | Private Client Group
Net revenues:
Net revenues	6,611	5,552	5,359
Pre-tax income/(loss):
Total pre-tax income	749	539	579
Net interest income (expense):
Net interest income	113	132	183
Total assets:
Aggregate assets	20,270	12,574
Goodwill and Intangible Assets:
Goodwill	417	277
Operating segments | Capital Markets
Net revenues:
Net revenues	1,885	1,291	1,083
Pre-tax income/(loss):
Total pre-tax income	532	225	110
Net interest income (expense):
Net interest income	6	9	4
Total assets:
Aggregate assets	2,457	2,336
Goodwill and Intangible Assets:
Goodwill	174	120
Operating segments | Asset Management
Net revenues:
Net revenues	867	715	691
Pre-tax income/(loss):
Total pre-tax income	389	284	253
Net interest income (expense):
Net interest income	0	1	3
Total assets:
Aggregate assets	476	380
Goodwill and Intangible Assets:
Goodwill	69	69
Operating segments | Raymond James Bank
Net revenues:
Net revenues	672	765	846
Pre-tax income/(loss):
Total pre-tax income	367	196	515
Net interest income (expense):
Net interest income	642	738	820
Total assets:
Aggregate assets	36,154	30,356
Operating segments | Other
Net revenues:
Net revenues	(8)	(82)	5
Pre-tax income/(loss):
Total pre-tax income	(246)	(192)	(82)
Total assets:
Aggregate assets	2,534	1,836
Intersegment eliminations
Net revenues:
Net revenues	(267)	(251)	(244)
Europe
Net revenues:
Net revenues	208	158	138
Pre-tax income/(loss):
Total pre-tax income	37	(5)	$ (10)
Total assets:
Aggregate assets	215	132
Goodwill and Intangible Assets:
Goodwill	16	$ 9
Europe | Cebile
Goodwill and Intangible Assets:
Goodwill additions	$ 7