v3.26.1
Business Combination - Merger-Related Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Noninterest Expense    
Compensation and benefits $ 1,410 $ 750
Technology and communications 204 123
Net occupancy expense 140 87
Card and processing expense 79 21
Equipment expense 55 42
Other noninterest expense 415 223
Total noninterest expense 2,395 1,304
Noninterest Income    
Total noninterest income 895 $ 694
Comerica Incorporated    
Noninterest Expense    
Compensation and benefits 427  
Technology and communications 21  
Net occupancy expense 25  
Card and processing expense 30  
Equipment expense 4  
Other noninterest expense 128  
Total noninterest expense 635  
Noninterest Income    
Other noninterest income (loss) (22)  
Total noninterest income (22)  
Total merger-related charges $ 657