AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 8,815	$ 8,315
RJ Bank
Debt Securities, Available-for-sale [Line Items]
Cost basis	9,327	8,322
Gross unrealized gains	4	62
Gross unrealized losses	(516)	(69)
Available-for-sale securities	8,815	8,315
RJ Bank \| Agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	5,629	5,168
Gross unrealized gains	4	46
Gross unrealized losses	(276)	(25)
Available-for-sale securities	5,357	5,189
RJ Bank \| Agency commercial MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,414	1,285
Gross unrealized gains	0	7
Gross unrealized losses	(114)	(28)
Available-for-sale securities	1,300	1,264
RJ Bank \| Agency CMOs
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,757	1,854
Gross unrealized gains	0	9
Gross unrealized losses	(119)	(16)
Available-for-sale securities	1,638	1,847
RJ Bank \| U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Cost basis	214	15
Gross unrealized gains	0	0
Gross unrealized losses	(1)	0
Available-for-sale securities	213	$ 15
RJ Bank \| Other agency obligations
Debt Securities, Available-for-sale [Line Items]
Cost basis	313
Gross unrealized gains	0
Gross unrealized losses	(6)
Available-for-sale securities	$ 307

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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