AVAILABLE FOR SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Schedule of Available for Sale Securities [Abstract]
Fair value	$ 7,650	$ 3,093
RJ Bank
Schedule of Available for Sale Securities [Abstract]
Cost basis	7,531	3,065
Gross unrealized gains	124	32
Gross unrealized losses	(5)	(4)
Fair value	7,650	3,093
RJ Bank \| Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	4,064	1,555
Gross unrealized gains	74	20
Gross unrealized losses	(3)	(1)
Fair value	4,135	1,574
RJ Bank \| Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	948	305
Gross unrealized gains	22	5
Gross unrealized losses	(1)	0
Fair value	969	310
RJ Bank \| Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	2,504	1,195
Gross unrealized gains	27	7
Gross unrealized losses	(1)	(3)
Fair value	2,530	1,199
RJ Bank \| Other securities
Schedule of Available for Sale Securities [Abstract]
Cost basis	15	10
Gross unrealized gains	1	0
Gross unrealized losses	0	0
Fair value	$ 16	$ 10

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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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