REVENUES, Sources of Revenue by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Principal transactions	$ 529	$ 492	$ 462
All other	65	62	78
Non-interest revenues	11,918	10,691	9,244
Total non-interest revenues	11,918	10,691	9,244
Interest Income	3,994	4,232	3,748
Total revenues	15,912	14,923	12,992
Interest expense	(1,847)	(2,102)	(1,373)
Net revenues	14,065	12,821	11,619
Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,078	6,196	5,363
Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,775	1,651	1,459
Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	614	575	547
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	511	519	439
Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	650	557	473
Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	2,304	2,143	1,921
Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,262	1,314	1,125
Mutual fund and other investment products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	530	470	414
RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	486	607	498
Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	246	237	213
Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,069	858	648
Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	623	521	418
Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	185	169	120
Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	261	168	110
Total other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	205	180	187
Non-interest revenues	205	180	187
Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	140	118	109
Operating segments | Private Client Group
Disaggregation of Revenue [Line Items]
Principal transactions	120	112	108
All other	29	27	48
Non-interest revenues	9,814	9,098	8,299
Total non-interest revenues	9,814	9,098	8,299
Interest Income	468	480	455
Total revenues	10,282	9,578	8,754
Interest expense	(100)	(119)	(100)
Net revenues	10,182	9,459	8,654
Operating segments | Private Client Group | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,980	5,246	4,545
Operating segments | Private Client Group | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,617	1,519	1,326
Operating segments | Private Client Group | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	605	567	540
Operating segments | Private Client Group | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	511	519	439
Operating segments | Private Client Group | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	501	433	347
Operating segments | Private Client Group | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	1,737	1,631	1,434
Operating segments | Private Client Group | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,033	2,156	2,237
Operating segments | Private Client Group | Mutual fund and other investment products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	518	461	415
Operating segments | Private Client Group | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,240	1,431	1,591
Operating segments | Private Client Group | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	275	264	231
Operating segments | Private Client Group | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	35	38	35
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	35	38	35
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]
Non-interest revenues	29	27	48
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	399	371	341
All other	2	4	2
Non-interest revenues	1,758	1,466	1,211
Total non-interest revenues	1,758	1,466	1,211
Interest Income	111	109	88
Total revenues	1,869	1,575	1,299
Interest expense	(99)	(103)	(85)
Net revenues	1,770	1,472	1,214
Operating segments | Capital Markets | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	2
Operating segments | Capital Markets | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	166	139	134
Operating segments | Capital Markets | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	6	5
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	159	133	129
Operating segments | Capital Markets | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	565	510	475
Operating segments | Capital Markets | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	14	13	10
Operating segments | Capital Markets | Mutual fund and other investment products
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	6	5	4
Operating segments | Capital Markets | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8	8	6
Operating segments | Capital Markets | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,036	820	613
Operating segments | Capital Markets | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	623	521	418
Operating segments | Capital Markets | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	150	131	85
Operating segments | Capital Markets | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	263	168	110
Operating segments | Capital Markets | Total other
Disaggregation of Revenue [Line Items]
Non-interest revenues	142	122	111
Operating segments | Capital Markets | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	140	118	109
Operating segments | Asset Management
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0
All other	2	3	2
Non-interest revenues	1,175	1,013	875
Total non-interest revenues	1,175	1,013	875
Interest Income	13	14	10
Total revenues	1,188	1,027	885
Interest expense	0	0	0
Net revenues	1,188	1,027	885
Operating segments | Asset Management | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,143	983	846
Operating segments | Asset Management | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	5	6
Operating segments | Asset Management | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4	5	6
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	3	0	0
Operating segments | Asset Management | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	7	5	6
Operating segments | Asset Management | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	23	22	21
Operating segments | Asset Management | Mutual fund and other investment products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	13	10	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	10	12	20
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]
Non-interest revenues	2	3	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 | RJ Bank
Disaggregation of Revenue [Line Items]
Principal transactions	10	9	15
All other	51	51	41
Total non-interest revenues	61	60	56
Interest Income	3,315	3,494	3,098
Total revenues	3,376	3,554	3,154
Interest expense	(1,600)	(1,838)	(1,141)
Net revenues	1,776	1,716	2,013
Operating segments | RJ Bank | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	10	9	15
Operating segments | RJ Bank | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Mutual fund and other investment products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Operating segments | RJ Bank | Total other
Disaggregation of Revenue [Line Items]
Non-interest revenues	51	51	41
Operating segments | RJ 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	(2)
All other	(19)	(23)	(15)
Non-interest revenues	(890)	(946)	(1,197)
Total non-interest revenues	(890)	(946)	(1,197)
Interest Income	87	135	97
Total revenues	(803)	(811)	(1,100)
Interest expense	(48)	(42)	(47)
Net revenues	(851)	(853)	(1,147)
Other and intersegment eliminations | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(46)	(34)	(30)
Other and intersegment eliminations | Securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(15)	(12)	(7)
Other and intersegment eliminations | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	(3)	(4)
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	(13)	(9)	(3)
Other and intersegment eliminations | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Total brokerage revenues	(15)	(12)	(9)
Other and intersegment eliminations | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(808)	(877)	(1,143)
Other and intersegment eliminations | Mutual fund and other investment products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	(1)	(2)
Other and intersegment eliminations | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(760)	(829)	(1,097)
Other and intersegment eliminations | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(47)	(47)	(44)
Other and intersegment eliminations | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	0	0
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	0
Other and intersegment eliminations | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(2)	0	0
Other and intersegment eliminations | Total other
Disaggregation of Revenue [Line Items]
Non-interest revenues	(19)	(23)	(15)
Other and intersegment eliminations | Affordable housing investments business revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0	$ 0