v3.25.4
INVESTMENT SECURITIES (Summary of Investment Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Amortized cost    
Total available-for-sale $ 10,353 $ 10,601
Held-to-maturity 8,867 9,669
Total investment securities 19,220 20,270
Gross unrealized gains    
Available-for-sale 22 1
Held-to-maturity 111 2
Total investment securities 133 3
Gross unrealized losses    
Available-for-sale 1,168 1,507
Held-to-maturity 38 289
Total investment securities 1,206 1,796
Estimated fair value    
Available-for-sale 9,207 9,095
Held-to-maturity 8,940 9,382
Total investment securities 18,147 18,477
U.S. Treasury securities    
Amortized cost    
Total available-for-sale 1,500 781
Gross unrealized gains    
Available-for-sale 17 0
Gross unrealized losses    
Available-for-sale 106 119
Estimated fair value    
Available-for-sale 1,411 662
Agency securities    
Amortized cost    
Total available-for-sale 313 441
Held-to-maturity 137 148
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 15 26
Held-to-maturity 3 8
Estimated fair value    
Available-for-sale 298 415
Held-to-maturity 134 140
Agency guaranteed mortgage-backed securities    
Amortized cost    
Total available-for-sale 7,207 7,713
Held-to-maturity 8,459 9,202
Gross unrealized gains    
Available-for-sale 5 1
Held-to-maturity 111 2
Gross unrealized losses    
Available-for-sale 989 1,263
Held-to-maturity 25 263
Estimated fair value    
Available-for-sale 6,223 6,451
Held-to-maturity 8,545 8,941
Small Business Administration loan-backed securities    
Amortized cost    
Total available-for-sale 355 455
Gross unrealized gains    
Available-for-sale 0 0
Gross unrealized losses    
Available-for-sale 14 21
Estimated fair value    
Available-for-sale 341 434
Municipal securities    
Amortized cost    
Total available-for-sale 953 1,186
Held-to-maturity 271 319
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 44 78
Held-to-maturity 10 18
Estimated fair value    
Available-for-sale 909 1,108
Held-to-maturity 261 301
Other debt securities    
Amortized cost    
Total available-for-sale 25 25
Gross unrealized gains    
Available-for-sale 0 0
Gross unrealized losses    
Available-for-sale 0 0
Estimated fair value    
Available-for-sale $ 25 25
Unrealized gains, other individual security categories | Maximum    
Gross unrealized gains    
Available-for-sale   $ 1