AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Schedule of Available for Sale Securities [Abstract]
Fair value	$ 9,181	$ 9,885
Bank
Schedule of Available for Sale Securities [Abstract]
Cost basis	10,433	11,100
Gross unrealized gains	0	0
Gross unrealized losses	(1,252)	(1,215)
Fair value	9,181	9,885
Bank \| Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	4,865	5,662
Gross unrealized gains	0	0
Gross unrealized losses	(654)	(668)
Fair value	4,211	4,994
Bank \| Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,464	1,518
Gross unrealized gains	0	0
Gross unrealized losses	(211)	(208)
Fair value	1,253	1,310
Bank \| Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,448	1,637
Gross unrealized gains	0	0
Gross unrealized losses	(265)	(233)
Fair value	1,183	1,404
Bank \| Other agency obligations
Schedule of Available for Sale Securities [Abstract]
Cost basis	710	613
Gross unrealized gains	0	0
Gross unrealized losses	(31)	(31)
Fair value	679	582
Bank \| Non-agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	527	492
Gross unrealized gains	0	0
Gross unrealized losses	(64)	(41)
Fair value	463	451
Bank \| U.S. Treasuries
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,261	1,014
Gross unrealized gains	0	0
Gross unrealized losses	(21)	(28)
Fair value	1,240	986
Bank \| Corporate bonds
Schedule of Available for Sale Securities [Abstract]
Cost basis	140	146
Gross unrealized gains	0	0
Gross unrealized losses	(6)	(5)
Fair value	134	141
Bank \| Other
Schedule of Available for Sale Securities [Abstract]
Cost basis	18	18
Gross unrealized gains	0	0
Gross unrealized losses	0	(1)
Fair value	$ 18	$ 17

Schedule Of Available For Sale Securities [Abstract]

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

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
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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- Definition

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).

+ References

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