AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
Schedule of Available for Sale Securities [Abstract]
Fair value	$ 8,530	$ 9,181
Bank
Schedule of Available for Sale Securities [Abstract]
Cost basis	9,444	10,433
Gross unrealized gains	2	0
Gross unrealized losses	(916)	(1,252)
Fair value	8,530	9,181
Bank \| Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	4,344	4,865
Gross unrealized gains	0	0
Gross unrealized losses	(471)	(654)
Fair value	3,873	4,211
Bank \| Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,439	1,464
Gross unrealized gains	0	0
Gross unrealized losses	(159)	(211)
Fair value	1,280	1,253
Bank \| Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,381	1,448
Gross unrealized gains	0	0
Gross unrealized losses	(214)	(265)
Fair value	1,167	1,183
Bank \| Other agency obligations
Schedule of Available for Sale Securities [Abstract]
Cost basis	629	710
Gross unrealized gains	0	0
Gross unrealized losses	(16)	(31)
Fair value	613	679
Bank \| Non-agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	567	527
Gross unrealized gains	1	0
Gross unrealized losses	(47)	(64)
Fair value	521	463
Bank \| U.S. Treasuries
Schedule of Available for Sale Securities [Abstract]
Cost basis	949	1,261
Gross unrealized gains	0	0
Gross unrealized losses	(4)	(21)
Fair value	945	1,240
Bank \| Corporate bonds
Schedule of Available for Sale Securities [Abstract]
Cost basis	116	140
Gross unrealized gains	1	0
Gross unrealized losses	(4)	(6)
Fair value	113	134
Bank \| Other
Schedule of Available for Sale Securities [Abstract]
Cost basis	19	18
Gross unrealized gains	0	0
Gross unrealized losses	(1)	0
Fair value	$ 18	$ 18

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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