AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 4,265	$ 3,093
RJ Bank
Debt Securities, Available-for-sale [Line Items]
Cost basis	4,154	3,065
Gross unrealized gains	112	32
Gross unrealized losses	(1)	(4)
Available-for-sale securities	4,265	3,093
RJ Bank \| Agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,929	1,555
Gross unrealized gains	56	20
Gross unrealized losses	0	(1)
Available-for-sale securities	1,985	1,574
RJ Bank \| Agency commercial MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	533	305
Gross unrealized gains	16	5
Gross unrealized losses	0	0
Available-for-sale securities	549	310
RJ Bank \| Agency CMOs
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,677	1,195
Gross unrealized gains	39	7
Gross unrealized losses	(1)	(3)
Available-for-sale securities	1,715	1,199
RJ Bank \| Other securities
Debt Securities, Available-for-sale [Line Items]
Cost basis	15	10
Gross unrealized gains	1	0
Gross unrealized losses	0	0
Available-for-sale securities	$ 16	$ 10

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).

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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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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
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Amortized cost 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amount 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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