AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 8,000	$ 7,650
RJ Bank
Debt Securities, Available-for-sale [Line Items]
Cost basis	7,905	7,531
Gross unrealized gains	107	124
Gross unrealized losses	(12)	(5)
Available-for-sale securities	8,000	7,650
RJ Bank \| Agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	4,421	4,064
Gross unrealized gains	72	74
Gross unrealized losses	(3)	(3)
Available-for-sale securities	4,490	4,135
RJ Bank \| Agency commercial MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,161	948
Gross unrealized gains	17	22
Gross unrealized losses	(4)	(1)
Available-for-sale securities	1,174	969
RJ Bank \| Agency CMOs
Debt Securities, Available-for-sale [Line Items]
Cost basis	2,308	2,504
Gross unrealized gains	17	27
Gross unrealized losses	(5)	(1)
Available-for-sale securities	2,320	2,530
RJ Bank \| Other securities
Debt Securities, Available-for-sale [Line Items]
Cost basis	15	15
Gross unrealized gains	1	1
Gross unrealized losses	0	0
Available-for-sale securities	$ 16	$ 16

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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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).

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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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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