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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Transactions in the ALLL by Portfolio Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Feb. 01, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period   $ 2,922 $ 2,384 $ 2,253 [1] $ 2,352
Losses charged off   (181) (194) (368) (366)
Recoveries of losses previously charged off   46 55 89 90
Provision for (benefit from) loan and lease losses   131 167 283 336
Allowance on PCD loans and leases at acquisition   (1)      
Allowance on PCD loans and leases at acquisition       179  
Allowance on PSLs at acquisition   1   482  
Balance, end of period   2,918 [1] 2,412 2,918 [1] 2,412
Net charge-offs (recoveries)   135 139 279 276
Comerica Incorporated          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance on PCD loans and leases at acquisition $ 179        
Net charge-offs (recoveries)       111  
Other Consumer Loans, Point of Sale          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Losses charged off   (3) (5) (7) (10)
Recoveries of losses previously charged off   3 5 7 10
Commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period   1,820 1,241 1,186 1,154
Losses charged off   (73) (90) (151) (156)
Recoveries of losses previously charged off   9 19 18 20
Provision for (benefit from) loan and lease losses   32 123 92 275
Allowance on PCD loans and leases at acquisition   0   177  
Allowance on PSLs at acquisition   0   466  
Balance, end of period   1,788 1,293 1,788 1,293
Residential Mortgage          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period   108 139 109 146
Losses charged off   (1) 0 (1) (1)
Recoveries of losses previously charged off   1 1 1 2
Provision for (benefit from) loan and lease losses   (5) (6) (12) (13)
Allowance on PCD loans and leases at acquisition   (1)      
Allowance on PCD loans and leases at acquisition       1  
Allowance on PSLs at acquisition   1   5  
Balance, end of period   103 134 103 134
Consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period   994 1,004 958 1,052
Losses charged off   (107) (104) (216) (209)
Recoveries of losses previously charged off   36 35 70 68
Provision for (benefit from) loan and lease losses   104 50 203 74
Allowance on PCD loans and leases at acquisition   0   1  
Allowance on PSLs at acquisition   0   11  
Balance, end of period   $ 1,027 $ 985 $ 1,027 $ 985
[1] Includes $33 and $38 of other short-term investments, $384 and $554 of portfolio loans and leases, $(7) and $(9) of ALLL, $2 and $3 of other assets, $10 and $11 of other liabilities and $312 and $473 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2026 and December 31, 2025, respectively. For further information, refer to Note 10.