REVENUES, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Principal transactions	$ 143	$ 93	$ 345	$ 262
Noninterest Income	1,659	1,679	5,248	4,977
All other	13	11	(3)	46
Interest income	217	321	799	961
Total revenues	1,876	2,000	6,047	5,938
Interest expense	(42)	(73)	(136)	(221)
Net revenues	1,834	1,927	5,911	5,717
Receivables related to contracts with customers	320		320		$ 347
Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	867	879	2,828	2,527
Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	486	451	1,461	1,357
Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	343	358	1,116	1,095
Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	134	150	448	458
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	88	105	288	308
Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	121	103	380	329
Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	134	183	484	559
Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	83	84	261	243
RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20	66	129	214
Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31	33	94	102
Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	139	139	428	439
Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	60	80	192	286
Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	42	37	146	97
Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	37	22	90	56
Total other
Disaggregation of Revenue [Line Items]
Noninterest Income	33	27	47	95
Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20	16	50	49
Operating segments | Private Client Group
Disaggregation of Revenue [Line Items]
Principal transactions	16	20	50	59
Noninterest Income	1,222	1,305	4,052	3,839
All other	4	3	20	19
Interest income	31	56	125	170
Total revenues	1,253	1,361	4,177	4,009
Interest expense	(4)	(10)	(19)	(31)
Net revenues	1,249	1,351	4,158	3,978
Operating segments | Private Client Group | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	715	718	2,330	2,063
Operating segments | Private Client Group | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	319	346	1,050	1,048
Operating segments | Private Client Group | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	303	326	1,000	989
Operating segments | Private Client Group | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	131	147	438	449
Operating segments | Private Client Group | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	88	105	288	308
Operating segments | Private Client Group | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84	74	274	232
Operating segments | Private Client Group | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	177	228	623	684
Operating segments | Private Client Group | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	82	85	260	250
Operating segments | Private Client Group | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	63	111	267	342
Operating segments | Private Client Group | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32	32	96	92
Operating segments | Private Client Group | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	10	29	25
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	7	10	29	25
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	4	3	20	19
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	127	74	298	203
Noninterest Income	321	251	873	778
All other	0	(1)	4	1
Interest income	4	10	22	29
Total revenues	325	261	895	807
Interest expense	(2)	(10)	(14)	(26)
Net revenues	323	251	881	781
Operating segments | Capital Markets | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	2	4	5
Operating segments | Capital Markets | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	166	104	411	306
Operating segments | Capital Markets | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	39	30	113	103
Operating segments | Capital Markets | Mutual and other fund products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	1	6	4
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	37	29	107	99
Operating segments | Capital Markets | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	1	5	3
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	0
Operating segments | Capital Markets | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	1	4	3
Operating segments | Capital Markets | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	132	129	399	414
Operating segments | Capital Markets | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	60	80	192	286
Operating segments | Capital Markets | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	35	27	117	72
Operating segments | Capital Markets | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	37	22	90	56
Operating segments | Capital Markets | Total other
Disaggregation of Revenue [Line Items]
Noninterest Income	20	15	54	50
Operating segments | Capital Markets | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20	16	50	49
Operating segments | Asset Management
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0	0
Noninterest Income	163	176	530	510
All other	1	1	2	1
Interest income	0	1	1	3
Total revenues	163	177	531	513
Interest expense	0	0	0	0
Net revenues	163	177	531	513
Operating segments | Asset Management | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	157	165	510	475
Operating segments | Asset Management | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	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	3	8	12	27
Operating segments | Asset Management | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1	0	2	2
Operating segments | Asset Management | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	1	0	3
Operating segments | Asset Management | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	7	10	22
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	1	1	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 | RJ Bank
Disaggregation of Revenue [Line Items]
Principal transactions	0	0	0	1
Noninterest Income	9	7	20	20
All other	9	7	20	19
Interest income	181	246	635	732
Total revenues	190	253	655	752
Interest expense	(12)	(38)	(51)	(122)
Net revenues	178	215	604	630
Operating segments | RJ Bank | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	0	0	0	1
Operating segments | RJ Bank | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | RJ Bank | Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | RJ Bank | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	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	0
Operating segments | RJ Bank | Total investment banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Merger & acquisition and advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | RJ Bank | Total other
Disaggregation of Revenue [Line Items]
Noninterest Income	9	7	20	19
Operating segments | RJ Bank | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating segments | Other and intersegment eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(20)	(4)	(72)	(2)
Other and intersegment eliminations | Other and intersegment eliminations
Disaggregation of Revenue [Line Items]
Principal transactions	0	(1)	(3)	(1)
Noninterest Income	(56)	(60)	(227)	(170)
All other	(1)	1	(49)	6
Interest income	1	8	16	27
Total revenues	(55)	(52)	(211)	(143)
Interest expense	(24)	(15)	(52)	(42)
Net revenues	(79)	(67)	(263)	(185)
Other and intersegment eliminations | Other and intersegment eliminations | Asset management and related administrative fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(6)	(6)	(16)	(16)
Other and intersegment eliminations | Other and intersegment eliminations | Total brokerage revenues
Disaggregation of Revenue [Line Items]
Noninterest Income	(1)	(1)	(6)	(5)
Other and intersegment eliminations | Other and intersegment eliminations | Subtotal securities commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(1)	0	(3)	(4)
Other and intersegment eliminations | 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 | 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 | Other and intersegment eliminations | Equities, ETFs and fixed income products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	(1)	(2)
Other and intersegment eliminations | Other and intersegment eliminations | Total account and service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(48)	(54)	(156)	(155)
Other and intersegment eliminations | Other and intersegment eliminations | Mutual fund and annuity service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	(1)	(1)	(9)
Other and intersegment eliminations | Other and intersegment eliminations | RJBDP fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(44)	(46)	(139)	(131)
Other and intersegment eliminations | Other and intersegment eliminations | Client account and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(4)	(7)	(16)	(15)
Other and intersegment eliminations | 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 | 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 | Other and intersegment eliminations | Equity underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations | Other and intersegment eliminations | Debt underwriting
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Other and intersegment eliminations | Other and intersegment eliminations | Total other
Disaggregation of Revenue [Line Items]
Noninterest Income	(1)	1	(49)	6
Other and intersegment eliminations | Other and intersegment eliminations | Tax credit fund revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0	$ 0	$ 0