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INVESTMENT SECURITIES (Contractual Maturities Debt Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Amortized cost    
Available-for-sale $ 10,379 $ 10,601
Due in one year or less 256  
Due after one year through five years 681  
Due after five years through ten years 3,030  
Due after ten years $ 6,412  
Average yield    
Total debt securities 2.42%  
Due in one year or less 3.41%  
Due after one year through five years 2.98%  
Due after five years through ten years 2.65%  
Due after ten years 2.21%  
Amortized cost    
Total debt securities $ 9,059  
Due in one year or less 27  
Due after one year through five years 159  
Due after five years through ten years 200  
Due after ten years $ 8,673  
Average yield    
Total debt securities 1.92%  
Due in one year or less 2.47%  
Due after one year through five years 2.65%  
Due after five years through ten years 3.56%  
Due after ten years 1.86%  
Amortized cost    
Total investment securities $ 19,438 20,270
Due in one year or less 283  
Due after one year through five years 840  
Due after five years through ten years 3,230  
Due after ten years $ 15,085  
Average yield    
Total debt securities 2.18%  
Due in one year or less 3.32%  
Due after one year through five years 2.92%  
Due after five years through ten years 2.71%  
Due after ten years 2.01%  
U.S. Treasury securities    
Amortized cost    
Available-for-sale $ 1,401 781
Due in one year or less 100  
Due after one year through five years 201  
Due after five years through ten years 699  
Due after ten years $ 401  
Average yield    
Total debt securities 3.69%  
Due in one year or less 4.04%  
Due after one year through five years 3.99%  
Due after five years through ten years 4.33%  
Due after ten years 2.35%  
Agency securities    
Amortized cost    
Available-for-sale $ 349 441
Due in one year or less 32  
Due after one year through five years 55  
Due after five years through ten years 163  
Due after ten years $ 99  
Average yield    
Total debt securities 3.18%  
Due in one year or less 2.78%  
Due after one year through five years 3.91%  
Due after five years through ten years 2.96%  
Due after ten years 3.28%  
Amortized cost    
Total debt securities $ 139  
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 77  
Due after ten years $ 62  
Average yield    
Total debt securities 4.15%  
Due in one year or less 0.00%  
Due after one year through five years 0.00%  
Due after five years through ten years 3.46%  
Due after ten years 5.01%  
Agency guaranteed mortgage-backed securities    
Amortized cost    
Available-for-sale $ 7,208 7,713
Due in one year or less 7  
Due after one year through five years 96  
Due after five years through ten years 1,478  
Due after ten years $ 5,627  
Average yield    
Total debt securities 2.04%  
Due in one year or less 1.27%  
Due after one year through five years 2.00%  
Due after five years through ten years 2.02%  
Due after ten years 2.05%  
Amortized cost    
Total debt securities $ 8,643  
Due in one year or less 0  
Due after one year through five years 28  
Due after five years through ten years 11  
Due after ten years $ 8,604  
Average yield    
Total debt securities 1.84%  
Due in one year or less 0.00%  
Due after one year through five years 1.46%  
Due after five years through ten years 2.70%  
Due after ten years 1.84%  
Small Business Administration loan-backed securities    
Amortized cost    
Available-for-sale $ 374 455
Due in one year or less 0  
Due after one year through five years 10  
Due after five years through ten years 110  
Due after ten years $ 254  
Average yield    
Total debt securities 4.58%  
Due in one year or less 0.00%  
Due after one year through five years 5.94%  
Due after five years through ten years 3.81%  
Due after ten years 4.87%  
Municipal securities    
Amortized cost    
Available-for-sale $ 1,022 1,186
Due in one year or less 117  
Due after one year through five years 309  
Due after five years through ten years 580  
Due after ten years $ 16  
Average yield    
Total debt securities 2.14%  
Due in one year or less 3.17%  
Due after one year through five years 2.16%  
Due after five years through ten years 1.91%  
Due after ten years 2.43%  
Amortized cost    
Total debt securities $ 277  
Due in one year or less 27  
Due after one year through five years 131  
Due after five years through ten years 112  
Due after ten years $ 7  
Average yield    
Total debt securities 3.26%  
Due in one year or less 2.47%  
Due after one year through five years 2.90%  
Due after five years through ten years 3.71%  
Due after ten years 5.93%  
Other debt securities    
Amortized cost    
Available-for-sale $ 25 $ 25
Due in one year or less 0  
Due after one year through five years 10  
Due after five years through ten years 0  
Due after ten years $ 15  
Average yield    
Total debt securities 8.15%  
Due in one year or less 0.00%  
Due after one year through five years 9.51%  
Due after five years through ten years 0.00%  
Due after ten years 7.25%