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AVAILABLE-FOR-SALE SECURITIES, Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Sep. 30, 2025
--- | --- | ---
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | $ 6,987 | $ 7,410
Gross unrealized gains | 5 | 10
Gross unrealized losses | (496) | (532)
Fair value | 6,496 | 6,888
Agency residential MBS |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 3,306 | 3,531
Gross unrealized gains | 2 | 3
Gross unrealized losses | (247) | (265)
Fair value | 3,061 | 3,269
Agency commercial MBS |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 950 | 1,223
Gross unrealized gains | 0 | 0
Gross unrealized losses | (70) | (85)
Fair value | 880 | 1,138
Agency CMOs |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 1,546 | 1,421
Gross unrealized gains | 1 | 3
Gross unrealized losses | (142) | (147)
Fair value | 1,405 | 1,277
U.S. Treasuries |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 532 | 429
Gross unrealized gains | 0 | 1
Gross unrealized losses | (1) | 0
Fair value | 531 | 430
Other agency obligations |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 139 | 229
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2) | (2)
Fair value | 137 | 227
Non-agency residential MBS |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 434 | 484
Gross unrealized gains | 0 | 1
Gross unrealized losses | (33) | (32)
Fair value | 401 | 453
Corporate bonds |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 65 | 79
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | (1)
Fair value | 66 | 79
Other |  |
Schedule of Available for Sale Securities [Abstract] |  |
Cost basis | 15 | 14
Gross unrealized gains | 1 | 1
Gross unrealized losses | (1) | 0
Fair value | $ 15 | $ 15

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