AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 9,773	$ 9,885
Bank
Debt Securities, Available-for-sale [Line Items]
Cost basis	10,777	11,100
Gross unrealized gains	1	0
Gross unrealized losses	(1,005)	(1,215)
Available-for-sale securities	9,773	9,885
Bank \| Agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	5,272	5,662
Gross unrealized gains	1	0
Gross unrealized losses	(520)	(668)
Available-for-sale securities	4,753	4,994
Bank \| Agency commercial MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,477	1,518
Gross unrealized gains	0	0
Gross unrealized losses	(178)	(208)
Available-for-sale securities	1,299	1,310
Bank \| Agency CMOs
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,545	1,637
Gross unrealized gains	0	0
Gross unrealized losses	(218)	(233)
Available-for-sale securities	1,327	1,404
Bank \| Other agency obligations
Debt Securities, Available-for-sale [Line Items]
Cost basis	760	613
Gross unrealized gains	0	0
Gross unrealized losses	(23)	(31)
Available-for-sale securities	737	582
Bank \| Non-agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	518	492
Gross unrealized gains	0	0
Gross unrealized losses	(39)	(41)
Available-for-sale securities	479	451
Bank \| U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,043	1,014
Gross unrealized gains	0	0
Gross unrealized losses	(22)	(28)
Available-for-sale securities	1,021	986
Bank \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost basis	145	146
Gross unrealized gains	0	0
Gross unrealized losses	(5)	(5)
Available-for-sale securities	140	141
Bank \| Other
Debt Securities, Available-for-sale [Line Items]
Cost basis	17	18
Gross unrealized gains	0	0
Gross unrealized losses	0	(1)
Available-for-sale securities	$ 17	$ 17

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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&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 https://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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