REVENUES, Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Principal transactions	$ 527	$ 561	$ 488
Total non-interest revenues	9,800	9,087	7,168
All other	61	124	21
Interest Income	1,508	823	1,000
Total revenues	11,308	9,910	8,168
Interest expense	(305)	(150)	(178)
Net revenues	11,003	9,760	7,990
Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,563	4,868	3,834
Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,589	1,651	1,468
Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	631	683	579
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	438	438	397
Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	520	530	492
Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	2,116	2,212	1,956
Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	833	635	624
Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	427	406	348
RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	202	76	150
Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	204	153	126
Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,100	1,143	650
Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	709	639	290
Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	248	332	227
Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	143	172	133
Total other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	188	229	104
Noninterest income	188	229	104
Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	127	105	83
Operating segments | Private Client Group
Disaggregation of Revenue [Line Items]
Principal transactions	76	50	64
Total non-interest revenues	7,503	6,498	5,420
All other	32	25	27
Interest Income	249	123	155
Total revenues	7,752	6,621	5,575
Interest expense	(42)	(10)	(23)
Net revenues	7,710	6,611	5,552
Operating segments | Private Client Group | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,710	4,056	3,162
Operating segments | Private Client Group | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,440	1,496	1,319
Operating segments | Private Client Group | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	620	670	567
Operating segments | Private Client Group | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	438	438	397
Operating segments | Private Client Group | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	382	388	355
Operating segments | Private Client Group | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	1,516	1,546	1,383
Operating segments | Private Client Group | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,207	824	807
Operating segments | Private Client Group | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	428	408	348
Operating segments | Private Client Group | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	559	259	330
Operating segments | Private Client Group | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	220	157	129
Operating segments | Private Client Group | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	38	47	41
Operating segments | Private Client Group | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Private Client Group | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	38	47	41
Operating segments | Private Client Group | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Private Client Group | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	32	25	27
Operating segments | Private Client Group | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Capital Markets
Disaggregation of Revenue [Line Items]
Principal transactions	446	511	427
Total non-interest revenues	1,800	1,879	1,282
All other	10	6	7
Interest Income	36	16	25
Total revenues	1,836	1,895	1,307
Interest expense	(27)	(10)	(16)
Net revenues	1,809	1,885	1,291
Operating segments | Capital Markets | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3	4	7
Operating segments | Capital Markets | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	144	149	144
Operating segments | Capital Markets | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6	6	7
Operating segments | Capital Markets | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Capital Markets | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	138	143	137
Operating segments | Capital Markets | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	590	660	571
Operating segments | Capital Markets | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8	8	6
Operating segments | Capital Markets | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Capital Markets | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	1
Operating segments | Capital Markets | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	7	5
Operating segments | Capital Markets | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,062	1,096	608
Operating segments | Capital Markets | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	709	639	290
Operating segments | Capital Markets | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	210	285	185
Operating segments | Capital Markets | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	143	172	133
Operating segments | Capital Markets | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	137	111	90
Operating segments | Capital Markets | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	127	105	83
Operating segments | Asset Management
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0
Total non-interest revenues	912	867	714
All other	1	2	2
Interest Income	2	0	1
Total revenues	914	867	715
Interest expense	0	0	0
Net revenues	914	867	715
Operating segments | Asset Management | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	882	837	688
Operating segments | Asset Management | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	10	8
Operating segments | Asset Management | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	10	8
Operating segments | Asset Management | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	7	10	8
Operating segments | Asset Management | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	22	18	16
Operating segments | Asset Management | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	0	1
Operating segments | Asset Management | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21	18	15
Operating segments | Asset Management | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Asset Management | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	1	2	2
Operating segments | Asset Management | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank
Disaggregation of Revenue [Line Items]
Principal transactions	5	0	1
Total non-interest revenues	31	30	27
All other	26	30	26
Interest Income	1,209	684	800
Total revenues	1,240	714	827
Interest expense	(156)	(42)	(62)
Net revenues	1,084	672	765
Operating segments | Bank | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	5	0	1
Operating segments | Bank | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | Bank | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	26	30	26
Operating segments | Bank | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Other and intersegment eliminations
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	(4)
Total non-interest revenues	(446)	(187)	(275)
All other	(8)	61	(41)
Interest Income	12	0	19
Total revenues	(434)	(187)	(256)
Interest expense	(80)	(88)	(77)
Net revenues	(514)	(275)	(333)
Other and intersegment eliminations | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(32)	(29)	(23)
Other and intersegment eliminations | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	(4)	(3)
Other and intersegment eliminations | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	(3)	(3)
Other and intersegment eliminations | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Other and intersegment eliminations | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	(1)	0
Other and intersegment eliminations | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	(2)	(4)	(7)
Other and intersegment eliminations | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(404)	(215)	(205)
Other and intersegment eliminations | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	(2)	(1)
Other and intersegment eliminations | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(358)	(184)	(181)
Other and intersegment eliminations | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(44)	(29)	(23)
Other and intersegment eliminations | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	1
Other and intersegment eliminations | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Other and intersegment eliminations | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	1
Other and intersegment eliminations | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Other and intersegment eliminations | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	(8)	61	(41)
Other and intersegment eliminations | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0	$ 0