REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Principal transactions	$ 105	$ 128	$ 364	$ 403
All other	36	9	65	37
Total non-interest revenues	2,306	2,404	6,748	7,466
Interest income	987	374	2,729	841
Total revenues	3,293	2,778	9,477	8,307
Interest expense	(386)	(60)	(911)	(135)
Net revenues	2,907	2,718	8,566	8,172
Receivables related to contracts with customers	543		543		$ 511
Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,373	1,427	3,917	4,273
Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	461	513	1,441	1,635
Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	356	385	1,077	1,232
Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	137	151	404	495
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	103	109	320	330
Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	116	125	353	407
Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	264	211	811	567
Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	103	102	306	324
RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	107	56	344	93
Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	54	53	161	150
Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	151	223	446	883
Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	88	147	277	557
Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	35	42	96	213
Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	28	34	73	113
Total other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	57	30	133	108
Noninterest income	57	30	133	108
Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21	21	68	71
Operating segments | Private Client Group
Disaggregation of Revenue [Line Items]
Principal transactions	25	25	81	52
All other	25	11	40	24
Total non-interest revenues	2,093	1,900	6,125	5,597
Interest income	114	68	340	138
Total revenues	2,207	1,968	6,465	5,735
Interest expense	(25)	(10)	(76)	(16)
Net revenues	2,182	1,958	6,389	5,719
Operating segments | Private Client Group | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,164	1,214	3,319	3,621
Operating segments | Private Client Group | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	349	373	1,058	1,167
Operating segments | Private Client Group | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	324	348	977	1,115
Operating segments | Private Client Group | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	135	149	398	486
Operating segments | Private Client Group | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	103	109	320	330
Operating segments | Private Client Group | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	86	90	259	299
Operating segments | Private Client Group | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	546	296	1,681	757
Operating segments | Private Client Group | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	103	102	306	325
Operating segments | Private Client Group | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	384	135	1,200	271
Operating segments | Private Client Group | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	59	59	175	161
Operating segments | Private Client Group | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9	6	27	28
Operating segments | Private Client Group | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Private Client Group | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9	6	27	28
Operating segments | Private Client Group | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Private Client Group | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	25	11	40	24
Operating segments | Private Client Group | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Capital Markets
Disaggregation of Revenue [Line Items]
Principal transactions	78	103	274	351
All other	0	1	1	4
Total non-interest revenues	276	380	872	1,402
Interest income	21	6	65	16
Total revenues	297	386	937	1,418
Interest expense	(21)	(3)	(64)	(8)
Net revenues	276	383	873	1,410
Operating segments | Capital Markets | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	0	2	2
Operating segments | Capital Markets | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	110	139	374	464
Operating segments | Capital Markets | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32	36	100	113
Operating segments | Capital Markets | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	4	5
Operating segments | Capital Markets | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Capital Markets | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31	35	96	108
Operating segments | Capital Markets | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3	2	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	0
Operating segments | Capital Markets | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	3	1
Operating segments | Capital Markets | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	1	5	5
Operating segments | Capital Markets | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	141	217	419	855
Operating segments | Capital Markets | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	88	147	277	557
Operating segments | Capital Markets | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	25	36	69	185
Operating segments | Capital Markets | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	28	34	73	113
Operating segments | Capital Markets | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	21	22	69	75
Operating segments | Capital Markets | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21	21	68	71
Operating segments | Asset Management
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0	0
All other	0	0	2	1
Total non-interest revenues	224	227	642	697
Interest income	2	1	7	1
Total revenues	226	228	649	698
Interest expense	0	0	0	0
Net revenues	226	228	649	698
Operating segments | Asset Management | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	217	220	620	673
Operating segments | Asset Management | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	2	2	4	6
Operating segments | Asset Management | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	2	4	6
Operating segments | Asset Management | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	2	4	6
Operating segments | Asset Management | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | Asset Management | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5	5	16	17
Operating segments | Asset Management | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	1	0
Operating segments | Asset Management | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Asset Management | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5	5	15	17
Operating segments | Asset Management | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Asset Management | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Asset Management | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Asset Management | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Asset Management | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	0	0	2	1
Operating segments | Asset Management | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank
Disaggregation of Revenue [Line Items]
Principal transactions	3	0	11	0
All other	14	6	33	20
Total non-interest revenues	17	6	44	20
Interest income	826	296	2,251	682
Total revenues	843	302	2,295	702
Interest expense	(329)	(26)	(733)	(46)
Net revenues	514	276	1,562	656
Operating segments | Bank | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	3	0	11	0
Operating segments | Bank | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | Bank | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | Bank | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Bank | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	14	6	33	20
Operating segments | Bank | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations
Disaggregation of Revenue [Line Items]
Principal transactions	(1)	0	(2)	0
All other	(3)	(9)	(11)	(12)
Total non-interest revenues	(304)	(109)	(935)	(250)
Interest income	24	3	66	4
Total revenues	(280)	(106)	(869)	(246)
Interest expense	(11)	(21)	(38)	(65)
Net revenues	(291)	(127)	(907)	(311)
Other and intersegment eliminations | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(9)	(7)	(24)	(23)
Other and intersegment eliminations | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	(3)	(1)	(6)	(2)
Other and intersegment eliminations | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	(1)	(4)	(2)
Other and intersegment eliminations | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	(1)	(2)	(2)
Other and intersegment eliminations | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	0	(2)	0
Other and intersegment eliminations | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(290)	(92)	(894)	(213)
Other and intersegment eliminations | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	(1)	(1)
Other and intersegment eliminations | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(278)	(80)	(859)	(179)
Other and intersegment eliminations | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(12)	(12)	(34)	(33)
Other and intersegment eliminations | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	0	0	0
Other and intersegment eliminations | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	0	0	0
Other and intersegment eliminations | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	(3)	(9)	(11)	(12)
Other and intersegment eliminations | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0	$ 0	$ 0