v3.26.1
INVESTMENT SECURITIES (Summary of Investment Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Amortized cost    
Available-for-sale $ 10,426 $ 10,353
Held-to-maturity 8,477 8,867
Total investment securities 18,903 19,220
Gross unrealized gains    
Available-for-sale 9 22
Held-to-maturity 34 111
Total investment securities 43 133
Gross unrealized losses    
Available-for-sale 1,196 1,168
Held-to-maturity 71 38
Estimated fair value    
Available-for-sale 9,239 9,207
Held-to-maturity, estimated fair value 8,440 8,940
Total investment securities 17,679 18,147
Total investment securities 1,267 1,206
U.S. Treasury securities    
Amortized cost    
Available-for-sale 2,097 1,500
Gross unrealized gains    
Available-for-sale 6 17
Gross unrealized losses    
Available-for-sale 125 106
Estimated fair value    
Available-for-sale 1,978 1,411
Agency securities    
Amortized cost    
Available-for-sale 282 313
Held-to-maturity 132 137
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 15 15
Held-to-maturity 4 3
Estimated fair value    
Available-for-sale 267 298
Held-to-maturity, estimated fair value 128 134
Agency guaranteed mortgage-backed securities    
Amortized cost    
Available-for-sale 6,826 7,207
Held-to-maturity 8,103 8,459
Gross unrealized gains    
Available-for-sale 3 5
Held-to-maturity 34 111
Gross unrealized losses    
Available-for-sale 999 989
Held-to-maturity 58 25
Estimated fair value    
Available-for-sale 5,830 6,223
Held-to-maturity, estimated fair value 8,079 8,545
Small Business Administration loan-backed securities    
Amortized cost    
Available-for-sale 301 355
Gross unrealized gains    
Available-for-sale 0 0
Gross unrealized losses    
Available-for-sale 13 14
Estimated fair value    
Available-for-sale 288 341
Municipal securities    
Amortized cost    
Available-for-sale 895 953
Held-to-maturity 242 271
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 44 44
Held-to-maturity 9 10
Estimated fair value    
Available-for-sale 851 909
Held-to-maturity, estimated fair value 233 261
Other debt securities    
Amortized cost    
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
Available-for-sale, Unrealized Gains, Other | Maximum    
Gross unrealized gains    
Available-for-sale $ 1 $ 1