v3.26.1
AVAILABLE-FOR-SALE SECURITIES, Contractual Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Amortized cost    
Within one year $ 485  
After one but within five years 1,480  
After five but within ten years 1,683  
After ten years 3,232  
Cost basis 6,880 $ 7,410
Fair value    
Within one year 485  
After one but within five years 1,402  
After five but within ten years 1,551  
After ten years 2,964  
Total $ 6,402 6,888
Weighted-average yield    
Within one year 2.94%  
After one but within five years 1.85%  
After five but within ten years 1.37%  
After ten years 2.91%  
Total 2.31%  
Agency residential MBS    
Amortized cost    
Within one year $ 1  
After one but within five years 343  
After five but within ten years 1,620  
After ten years 1,358  
Cost basis 3,322 3,531
Fair value    
Within one year 1  
After one but within five years 325  
After five but within ten years 1,492  
After ten years 1,267  
Total $ 3,085 3,269
Weighted-average yield    
Within one year 2.21%  
After one but within five years 1.21%  
After five but within ten years 1.32%  
After ten years 3.07%  
Total 2.02%  
Agency commercial MBS    
Amortized cost    
Within one year $ 200  
After one but within five years 802  
After five but within ten years 9  
After ten years 44  
Cost basis 1,055 1,223
Fair value    
Within one year 198  
After one but within five years 742  
After five but within ten years 8  
After ten years 36  
Total $ 984 1,138
Weighted-average yield    
Within one year 1.62%  
After one but within five years 1.30%  
After five but within ten years 1.16%  
After ten years 1.86%  
Total 1.38%  
Agency CMOs    
Amortized cost    
Within one year $ 0  
After one but within five years 0  
After five but within ten years 31  
After ten years 1,362  
Cost basis 1,393 1,421
Fair value    
Within one year 0  
After one but within five years 0  
After five but within ten years 29  
After ten years 1,225  
Total $ 1,254 1,277
Weighted-average yield    
Within one year 0.00%  
After one but within five years 0.00%  
After five but within ten years 1.47%  
After ten years 2.41%  
Total 2.39%  
U.S. Treasuries    
Amortized cost    
Within one year $ 244  
After one but within five years 178  
After five but within ten years 0  
After ten years 0  
Cost basis 422 429
Fair value    
Within one year 245  
After one but within five years 178  
After five but within ten years 0  
After ten years 0  
Total $ 423 430
Weighted-average yield    
Within one year 3.93%  
After one but within five years 3.85%  
After five but within ten years 0.00%  
After ten years 0.00%  
Total 3.90%  
Other agency obligations    
Amortized cost    
Within one year $ 32  
After one but within five years 113  
After five but within ten years 0  
After ten years 8  
Cost basis 153 229
Fair value    
Within one year 33  
After one but within five years 112  
After five but within ten years 0  
After ten years 7  
Total $ 152 227
Weighted-average yield    
Within one year 3.10%  
After one but within five years 3.45%  
After five but within ten years 0.00%  
After ten years 3.07%  
Total 3.36%  
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 450  
Cost basis 450 484
Fair value    
Within one year 0  
After one but within five years 0  
After five but within ten years 0  
After ten years 419  
Total $ 419 453
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 4.03%  
Total 4.03%  
Corporate bonds    
Amortized cost    
Within one year $ 8  
After one but within five years 44  
After five but within ten years 17  
After ten years 0  
Cost basis 69 79
Fair value    
Within one year 8  
After one but within five years 45  
After five but within ten years 17  
After ten years 0  
Total $ 70 79
Weighted-average yield    
Within one year 5.25%  
After one but within five years 4.69%  
After five but within ten years 4.99%  
After ten years 0.00%  
Total 4.83%  
Other    
Amortized cost    
Within one year $ 0  
After one but within five years 0  
After five but within ten years 6  
After ten years 10  
Cost basis 16 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 6.78%  
After ten years 6.40%  
Total 6.53%