v3.26.1
Long-Term Debt (Details) - USD ($)
$ in Millions
Jan. 29, 2026
Feb. 01, 2026
Comerica Incorporated    
Debt Instrument [Line Items]    
Long-term debt assumed   $ 5,529
Long-term debt assumed   $ 5,529
Senior Notes | Fixed Rate Floating Rate 4.566% Senior Notes Due 2032 | Parent Company    
Debt Instrument [Line Items]    
Principal amount $ 1,000  
Senior Notes | Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 | Parent Company    
Debt Instrument [Line Items]    
Interest rate 4.566%  
Basis spread on variable rate (as a percent) 0.95%  
Senior Notes | Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 | Redemption Period One | Parent Company    
Debt Instrument [Line Items]    
Redemption period 180 days  
Senior Notes | Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 | Redemption Period Two | Parent Company    
Debt Instrument [Line Items]    
Redemption period 1 year  
Senior Notes | Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 | Redemption Period Three | Parent Company    
Debt Instrument [Line Items]    
Redemption period 30 days  
Senior Notes | Fixed-Rate/Floating-Rate 5.141 Percent Senior Notes Due January 29, 2037 | Parent Company    
Debt Instrument [Line Items]    
Principal amount $ 1,000  
Interest rate 5.141%  
Basis spread on variable rate (as a percent) 1.24%  
Senior Notes | Fixed-Rate/Floating-Rate 5.141 Percent Senior Notes Due January 29, 2037 | Redemption Period One | Parent Company    
Debt Instrument [Line Items]    
Redemption period 180 days  
Senior Notes | Fixed-Rate/Floating-Rate 5.141 Percent Senior Notes Due January 29, 2037 | Redemption Period Two | Parent Company    
Debt Instrument [Line Items]    
Redemption period 1 year  
Senior Notes | Fixed-Rate/Floating-Rate 5.141 Percent Senior Notes Due January 29, 2037 | Redemption Period Three | Parent Company    
Debt Instrument [Line Items]    
Redemption period 90 days