XML 120 R105.htm IDEA: XBRL DOCUMENT v3.26.1
Long-Term Debt - Loans Assumed In Acquisition (Details) - USD ($)
$ in Millions
Jun. 10, 2026
Feb. 01, 2026
Comerica Incorporated    
Debt Instrument [Line Items]    
Long-term debt assumed   $ 5,529
Comerica Incorporated | FHLB Advances | Subsidiaries | Weighted-Average    
Debt Instrument [Line Items]    
Interest rate   4.588%
Senior Notes | Fixed-Rate 4.00% Senior Notes Due in 2029    
Debt Instrument [Line Items]    
Interest rate 4.00%  
Senior Notes | Fixed-Rate 5.982% Senior Notes Due 2030    
Debt Instrument [Line Items]    
Interest rate 5.982%  
Senior Notes | Comerica Incorporated | Fixed-Rate 4.00% Senior Notes Due in 2029    
Debt Instrument [Line Items]    
Interest rate 4.00% 4.00%
Long-term debt assumed   $ 547
Senior Notes | Comerica Incorporated | Fixed-Rate 5.982% Senior Notes Due 2030    
Debt Instrument [Line Items]    
Interest rate 5.982% 5.982%
Long-term debt assumed   $ 1,046
Subordinated Debt | Comerica Incorporated | Fixed-Rate 3.80% Senior Notes Due 2026    
Debt Instrument [Line Items]    
Interest rate   3.80%
Long-term debt assumed   $ 250
Subordinated Debt | Comerica Incorporated | Fixed-Rate 7.875% Notes Due 2026    
Debt Instrument [Line Items]    
Interest rate   7.875%
Long-term debt assumed   $ 152
Subordinated Debt | Comerica Incorporated | Fixed-Rate 5.332% Notes Due 2033    
Debt Instrument [Line Items]    
Interest rate   5.332%
Long-term debt assumed   $ 506
Federal Home Loan Bank Advances | Comerica Incorporated    
Debt Instrument [Line Items]    
Long-term debt assumed   $ 3,028