REVENUES, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Principal transactions	$ 128	$ 137	$ 403	$ 432
All other	9	38	37	98
Total non-interest revenues	2,404	2,306	7,466	6,572
Interest income	374	205	841	608
Total revenues	2,778	2,511	8,307	7,180
Interest expense	(60)	(40)	(135)	(115)
Net revenues	2,718	2,471	8,172	7,065
Receivables related to contracts with customers	427		427		$ 416
Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,427	1,262	4,273	3,502
Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	513	552	1,635	1,671
Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	385	415	1,232	1,239
Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	151	171	495	508
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	109	113	330	320
Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	125	131	407	411
Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	211	161	567	465
Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	102	104	324	297
RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	56	18	93	58
Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	53	39	150	110
Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	223	276	883	779
Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	147	153	557	424
Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	42	80	213	229
Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	34	43	113	126
Total other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	30	55	108	155
Noninterest income	30	55	108	155
Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21	17	71	57
Operating segments | Private Client Group
Disaggregation of Revenue [Line Items]
Principal transactions	25	13	52	38
All other	11	7	24	20
Total non-interest revenues	1,900	1,667	5,597	4,726
Interest income	68	31	138	91
Total revenues	1,968	1,698	5,735	4,817
Interest expense	(10)	(2)	(16)	(7)
Net revenues	1,958	1,696	5,719	4,810
Operating segments | Private Client Group | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,214	1,050	3,621	2,914
Operating segments | Private Client Group | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	373	390	1,167	1,156
Operating segments | Private Client Group | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	348	377	1,115	1,118
Operating segments | Private Client Group | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	149	167	486	498
Operating segments | Private Client Group | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	109	113	330	320
Operating segments | Private Client Group | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	90	97	299	300
Operating segments | Private Client Group | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	296	209	757	603
Operating segments | Private Client Group | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	102	105	325	298
Operating segments | Private Client Group | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	135	65	271	192
Operating segments | Private Client Group | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	59	39	161	113
Operating segments | Private Client Group | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6	11	28	33
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	6	11	28	33
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	11	7	24	20
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	103	125	351	394
All other	1	1	4	5
Total non-interest revenues	380	445	1,402	1,326
Interest income	6	4	16	12
Total revenues	386	449	1,418	1,338
Interest expense	(3)	(3)	(8)	(7)
Net revenues	383	446	1,410	1,331
Operating segments | Capital Markets | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	1	2	3
Operating segments | Capital Markets | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	139	160	464	509
Operating segments | Capital Markets | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	36	35	113	115
Operating segments | Capital Markets | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	2	5	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	35	33	108	110
Operating segments | Capital Markets | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	1	6	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	0	1	1
Operating segments | Capital Markets | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	5	5
Operating segments | Capital Markets | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	217	265	855	746
Operating segments | Capital Markets | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	147	153	557	424
Operating segments | Capital Markets | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	36	69	185	196
Operating segments | Capital Markets | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	34	43	113	126
Operating segments | Capital Markets | Total other
Disaggregation of Revenue [Line Items]
Noninterest income	22	18	75	62
Operating segments | Capital Markets | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21	17	71	57
Operating segments | Asset Management
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0	0
All other	0	1	1	2
Total non-interest revenues	227	225	697	629
Interest income	1	0	1	0
Total revenues	228	225	698	629
Interest expense	0	0	0	0
Net revenues	228	225	698	629
Operating segments | Asset Management | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	220	218	673	607
Operating segments | Asset Management | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	2	2	6	7
Operating segments | Asset Management | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	2	6	7
Operating segments | Asset Management | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	2	6	7
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	4	17	13
Operating segments | Asset Management | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	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	4	17	13
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	1	1	2
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	0	0	0	1
All other	6	8	20	22
Total non-interest revenues	6	8	20	23
Interest income	296	172	682	505
Total revenues	302	180	702	528
Interest expense	(26)	(11)	(46)	(32)
Net revenues	276	169	656	496
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	0	0	0	1
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	6	8	20	22
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	0	(1)	0	(1)
All other	(9)	21	(12)	49
Total non-interest revenues	(109)	(39)	(250)	(132)
Interest income	3	(2)	4	0
Total revenues	(106)	(41)	(246)	(132)
Interest expense	(21)	(24)	(65)	(69)
Net revenues	(127)	(65)	(311)	(201)
Other and intersegment eliminations | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(7)	(7)	(23)	(22)
Other and intersegment eliminations | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	(1)	0	(2)	(2)
Other and intersegment eliminations | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	1	(2)	(1)
Other and intersegment eliminations | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	0	(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	0	1	0	1
Other and intersegment eliminations | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(92)	(53)	(213)	(157)
Other and intersegment eliminations | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	(1)	(1)	(1)
Other and intersegment eliminations | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(80)	(47)	(179)	(135)
Other and intersegment eliminations | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(12)	(5)	(33)	(21)
Other and intersegment eliminations | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0	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	(9)	21	(12)	49
Other and intersegment eliminations | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0	$ 0	$ 0