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Business Combination - Merger-Related Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Noninterest Expense        
Compensation and benefits $ 1,129 $ 698 $ 2,539 $ 1,447
Technology and communications 250 126 453 250
Net occupancy expense 154 83 295 171
Card and processing expense 66 22 144 43
Equipment expense 60 41 115 82
Marketing expense 65 43 114 71
Other noninterest expense 332 215 749 438
Total noninterest expense 2,109 1,264 4,504 2,568
Noninterest Income        
Total noninterest income 1,059 $ 750 1,954 $ 1,444
Comerica Incorporated        
Noninterest Expense        
Compensation and benefits 110   537  
Technology and communications 43   64  
Net occupancy expense 29   53  
Card and processing expense 0   30  
Equipment expense 5   9  
Marketing expense 1   1  
Other noninterest expense 5   133  
Total noninterest expense 193   827  
Noninterest Income        
Other noninterest income (loss) 0   (22)  
Total noninterest income 0   (22)  
Total merger-related charges $ 193   $ 849