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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