AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Schedule of Available for Sale Securities [Abstract]
Cost basis	$ 7,757	$ 8,906
Gross unrealized gains	7	7
Gross unrealized losses	(599)	(653)
Fair value	7,165	8,260
Agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	3,693	4,147
Gross unrealized gains	2	3
Gross unrealized losses	(299)	(327)
Fair value	3,396	3,823
Agency commercial MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,282	1,415
Gross unrealized gains	0	0
Gross unrealized losses	(98)	(119)
Fair value	1,184	1,296
Agency CMOs
Schedule of Available for Sale Securities [Abstract]
Cost basis	1,394	1,394
Gross unrealized gains	2	1
Gross unrealized losses	(161)	(170)
Fair value	1,235	1,225
U.S. Treasuries
Schedule of Available for Sale Securities [Abstract]
Cost basis	431	706
Gross unrealized gains	1	0
Gross unrealized losses	0	(2)
Fair value	432	704
Other agency obligations
Schedule of Available for Sale Securities [Abstract]
Cost basis	354	565
Gross unrealized gains	0	0
Gross unrealized losses	(3)	(6)
Fair value	351	559
Non-agency residential MBS
Schedule of Available for Sale Securities [Abstract]
Cost basis	499	553
Gross unrealized gains	1	1
Gross unrealized losses	(37)	(27)
Fair value	463	527
Corporate bonds
Schedule of Available for Sale Securities [Abstract]
Cost basis	89	107
Gross unrealized gains	0	1
Gross unrealized losses	0	(2)
Fair value	89	106
Other investments
Schedule of Available for Sale Securities [Abstract]
Cost basis	15	19
Gross unrealized gains	1	1
Gross unrealized losses	(1)	0
Fair value	$ 15	$ 20

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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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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