SEGMENT INFORMATION, Information Concerning Operations (Details) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment		5
Revenues:
Total net revenues		$ 2,222	$ 2,009
Pre-tax income
Total pre-tax income		399	359
Net interest income (expense):
Net interest income		165	246
Total assets:
Total assets	$ 53,657	53,657		$ 47,482
Goodwill:
Goodwill	606	606		466
NWPS
Goodwill:
Goodwill, acquired during period	139
Operating segments | Private Client Group
Revenues:
Total net revenues		1,467	1,414
Pre-tax income
Total pre-tax income		140	153
Net interest income (expense):
Net interest income		28	41
Total assets:
Total assets	17,998	17,998		12,574
Goodwill:
Goodwill	417	417		277
Operating segments | Private Client Group | NWPS
Goodwill:
Goodwill, acquired during period		139
Operating segments | Capital Markets
Revenues:
Total net revenues		452	268
Pre-tax income
Total pre-tax income		129	29
Net interest income (expense):
Net interest income		1	2
Total assets:
Total assets	1,960	1,960		2,336
Goodwill:
Goodwill	120	120		120
Operating segments | Asset Management
Revenues:
Total net revenues		195	184
Pre-tax income
Total pre-tax income		83	73
Net interest income (expense):
Net interest income		0	1
Total assets:
Total assets	388	388		380
Goodwill:
Goodwill	69	69		69
Operating segments | RJ Bank
Revenues:
Total net revenues		167	216
Pre-tax income
Total pre-tax income		71	135
Net interest income (expense):
Net interest income		157	210
Total assets:
Total assets	31,352	31,352		30,356
Operating segments | Other
Revenues:
Total net revenues		4	(8)
Pre-tax income
Total pre-tax income		(24)	(31)
Net interest income (expense):
Net interest income		(21)	(8)
Total assets:
Total assets	$ 1,959	1,959		$ 1,836
Intersegment eliminations
Revenues:
Total net revenues		$ (63)	$ (65)