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AVAILABLE-FOR-SALE SECURITIES, Contractual Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Amortized cost    
Within one year $ 402  
After one but within five years 1,631  
After five but within ten years 1,618  
After ten years 3,336  
Cost basis 6,987 $ 7,410
Fair value    
Within one year 400  
After one but within five years 1,547  
After five but within ten years 1,477  
After ten years 3,072  
Total $ 6,496 6,888
Weighted-average yield    
Within one year 2.98%  
After one but within five years 2.06%  
After five but within ten years 1.37%  
After ten years 3.12%  
Total 2.46%  
Agency residential MBS    
Amortized cost    
Within one year $ 1  
After one but within five years 413  
After five but within ten years 1,567  
After ten years 1,325  
Cost basis 3,306 3,531
Fair value    
Within one year 1  
After one but within five years 390  
After five but within ten years 1,428  
After ten years 1,242  
Total $ 3,061 3,269
Weighted-average yield    
Within one year 2.18%  
After one but within five years 1.18%  
After five but within ten years 1.35%  
After ten years 3.39%  
Total 2.14%  
Agency commercial MBS    
Amortized cost    
Within one year $ 161  
After one but within five years 738  
After five but within ten years 8  
After ten years 43  
Cost basis 950 1,223
Fair value    
Within one year 159  
After one but within five years 680  
After five but within ten years 7  
After ten years 34  
Total $ 880 1,138
Weighted-average yield    
Within one year 1.65%  
After one but within five years 1.28%  
After five but within ten years 1.21%  
After ten years 1.83%  
Total 1.37%  
Agency CMOs    
Amortized cost    
Within one year $ 0  
After one but within five years 0  
After five but within ten years 29  
After ten years 1,517  
Cost basis 1,546 1,421
Fair value    
Within one year 0  
After one but within five years 0  
After five but within ten years 27  
After ten years 1,378  
Total $ 1,405 1,277
Weighted-average yield    
Within one year 0.00%  
After one but within five years 0.00%  
After five but within ten years 1.46%  
After ten years 2.67%  
Total 2.64%  
U.S. Treasuries    
Amortized cost    
Within one year $ 205  
After one but within five years 327  
After five but within ten years 0  
After ten years 0  
Cost basis 532 429
Fair value    
Within one year 205  
After one but within five years 326  
After five but within ten years 0  
After ten years 0  
Total $ 531 430
Weighted-average yield    
Within one year 3.98%  
After one but within five years 3.96%  
After five but within ten years 0.00%  
After ten years 0.00%  
Total 3.97%  
Other agency obligations    
Amortized cost    
Within one year $ 27  
After one but within five years 105  
After five but within ten years 0  
After ten years 7  
Cost basis 139 229
Fair value    
Within one year 27  
After one but within five years 103  
After five but within ten years 0  
After ten years 7  
Total $ 137 227
Weighted-average yield    
Within one year 3.08%  
After one but within five years 3.85%  
After five but within ten years 0.00%  
After ten years 3.06%  
Total 3.66%  
Non-agency residential MBS    
Amortized cost    
Within one year $ 0  
After one but within five years 0  
After five but within ten years 0  
After ten years 434  
Cost basis 434 484
Fair value    
Within one year 0  
After one but within five years 0  
After five but within ten years 0  
After ten years 401  
Total $ 401 453
Weighted-average yield    
Within one year 0.00%  
After one but within five years 0.00%  
After five but within ten years 0.00%  
After ten years 3.96%  
Total 3.96%  
Corporate bonds    
Amortized cost    
Within one year $ 8  
After one but within five years 48  
After five but within ten years 9  
After ten years 0  
Cost basis 65 79
Fair value    
Within one year 8  
After one but within five years 48  
After five but within ten years 10  
After ten years 0  
Total $ 66 79
Weighted-average yield    
Within one year 4.20%  
After one but within five years 4.62%  
After five but within ten years 5.66%  
After ten years 0.00%  
Total 4.72%  
Other    
Amortized cost    
Within one year $ 0  
After one but within five years 0  
After five but within ten years 5  
After ten years 10  
Cost basis 15 14
Fair value    
Within one year 0  
After one but within five years 0  
After five but within ten years 5  
After ten years 10  
Total $ 15 $ 15
Weighted-average yield    
Within one year 0.00%  
After one but within five years 0.00%  
After five but within ten years 1.99%  
After ten years 6.30%  
Total 4.84%