AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Schedule of Available for Sale Securities [Abstract]
Fair value	$ 9,885	$ 8,315
Bank
Schedule of Available for Sale Securities [Abstract]
Cost basis	11,100	8,322
Gross unrealized gains	0	62
Gross unrealized losses	(1,215)	(69)
Fair value	9,885	8,315
Bank \| Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	5,662	5,168
Gross unrealized gains	0	46
Gross unrealized losses	(668)	(25)
Fair value	4,994	5,189
Bank \| Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,518	1,285
Gross unrealized gains	0	7
Gross unrealized losses	(208)	(28)
Fair value	1,310	1,264
Bank \| Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,637	1,854
Gross unrealized gains	0	9
Gross unrealized losses	(233)	(16)
Fair value	1,404	1,847
Bank \| Other agency obligations
Schedule of Available for Sale Securities [Abstract]
Cost basis	613
Gross unrealized gains	0
Gross unrealized losses	(31)
Fair value	582
Bank \| Non-agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	492
Gross unrealized gains	0
Gross unrealized losses	(41)
Fair value	451
Bank \| U.S. Treasuries
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,014	15
Gross unrealized gains	0	0
Gross unrealized losses	(28)	0
Fair value	986	$ 15
Bank \| Corporate bonds
Schedule of Available for Sale Securities [Abstract]
Cost basis	146
Gross unrealized gains	0
Gross unrealized losses	(5)
Fair value	141
Bank \| Other
Schedule of Available for Sale Securities [Abstract]
Cost basis	18
Gross unrealized gains	0
Gross unrealized losses	(1)
Fair value	$ 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://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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- 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
-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).

+ References

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