AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 10,464	$ 8,315
Bank
Debt Securities, Available-for-sale [Line Items]
Cost basis	11,189	8,322
Gross unrealized gains	2	62
Gross unrealized losses	(727)	(69)
Available-for-sale securities	10,464	8,315
Bank \| Agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	5,903	5,168
Gross unrealized gains	0	46
Gross unrealized losses	(390)	(25)
Available-for-sale securities	5,513	5,189
Bank \| Agency commercial MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,428	1,285
Gross unrealized gains	0	7
Gross unrealized losses	(144)	(28)
Available-for-sale securities	1,284	1,264
Bank \| Agency CMOs
Debt Securities, Available-for-sale [Line Items]
Cost basis	1,706	1,854
Gross unrealized gains	1	9
Gross unrealized losses	(161)	(16)
Available-for-sale securities	1,546	1,847
Bank \| Other agency obligations
Debt Securities, Available-for-sale [Line Items]
Cost basis	578
Gross unrealized gains	0
Gross unrealized losses	(11)
Available-for-sale securities	567
Bank \| Non-agency residential MBS
Debt Securities, Available-for-sale [Line Items]
Cost basis	496
Gross unrealized gains	0
Gross unrealized losses	(11)
Available-for-sale securities	485
Bank \| U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Cost basis	919	15
Gross unrealized gains	0	0
Gross unrealized losses	(7)	0
Available-for-sale securities	912	$ 15
Bank \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost basis	140
Gross unrealized gains	1
Gross unrealized losses	(1)
Available-for-sale securities	140
Bank \| Other
Debt Securities, Available-for-sale [Line Items]
Cost basis	19
Gross unrealized gains	0
Gross unrealized losses	(2)
Available-for-sale securities	$ 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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