AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available for Sale Securities [Abstract]
Fair value	$ 8,315	$ 7,650
Raymond James Bank
Schedule of Available for Sale Securities [Abstract]
Cost basis	8,322	7,531
Gross unrealized gains	62	124
Gross unrealized losses	(69)	(5)
Fair value	8,315	7,650
Raymond James Bank \| Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	5,168	4,064
Gross unrealized gains	46	74
Gross unrealized losses	(25)	(3)
Fair value	5,189	4,135
Raymond James Bank \| Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,285	948
Gross unrealized gains	7	22
Gross unrealized losses	(28)	(1)
Fair value	1,264	969
Raymond James Bank \| Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,854	2,504
Gross unrealized gains	9	27
Gross unrealized losses	(16)	(1)
Fair value	1,847	2,530
Raymond James Bank \| Other securities
Schedule of Available for Sale Securities [Abstract]
Cost basis	15	15
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair value	$ 15	$ 16

Schedule Of Available For Sale Securities [Abstract]

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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).

+ 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 (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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