SEGMENT INFORMATION, Information Concerning Operations (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($) businessSegment	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | businessSegment	5
Revenues:
Total net revenues	$ 2,781	$ 2,222
Pre-tax income
Total pre-tax income	558	399
Net interest income (expense):
Net interest income	188	165
Total assets:
Total assets	68,461		$ 61,891
Goodwill:
Goodwill	660		660
Operating segments | Private Client Group
Revenues:
Total net revenues	1,839	1,467
Pre-tax income
Total pre-tax income	195	140
Net interest income (expense):
Net interest income	30	28
Total assets:
Total assets	25,431		20,270
Goodwill:
Goodwill	417		417
Operating segments | Capital Markets
Revenues:
Total net revenues	614	452
Pre-tax income
Total pre-tax income	201	129
Net interest income (expense):
Net interest income	3	1
Total assets:
Total assets	2,027		2,457
Goodwill:
Goodwill	174		174
Operating segments | Asset Management
Revenues:
Total net revenues	236	195
Pre-tax income
Total pre-tax income	107	83
Total assets:
Total assets	482		476
Goodwill:
Goodwill	69		69
Operating segments | RJ Bank
Revenues:
Total net revenues	183	167
Pre-tax income
Total pre-tax income	102	71
Net interest income (expense):
Net interest income	177	157
Total assets:
Total assets	37,789		36,154
Operating segments | Other
Revenues:
Total net revenues	(15)	4
Pre-tax income
Total pre-tax income	(47)	(24)
Net interest income (expense):
Net interest income	(22)	(21)
Total assets:
Total assets	2,732		$ 2,534
Intersegment eliminations
Revenues:
Total net revenues	$ (76)	$ (63)