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Cover - shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jul. 28, 2025
Cover [Abstract] |  |
Document Type | 10-Q |
Document Quarterly Report | true |
Document Period End Date | Jun. 30, 2025 |
Document Transition Report | false |
Entity File Number | 1-10706 |
Entity Registrant Name | Comerica Incorporated |
Entity Incorporation, State or Country Code | DE |
Entity Tax Identification Number | 38-1998421 |
Entity Address, Address Line One | 1717 Main Street, MC 6404 |
Entity Address, City or Town | Dallas |
Entity Address, State or Province | TX |
Entity Address, Postal Zip Code | 75201 |
City Area Code | (833) |
Local Phone Number | 571-0486 |
Title of 12(b) Security | Common Stock, $5 par value |
Trading Symbol | CMA |
Security Exchange Name | NYSE |
Entity Current Reporting Status | Yes |
Entity Interactive Data Current | Yes |
Entity Filer Category | Large Accelerated Filer |
Entity Small Business | false |
Entity Emerging Growth Company | false |
Entity Shell Company | false |
Entity Common Stock, Shares Outstanding |  | 128,525,470
Entity Central Index Key | 0000028412 |
Current Fiscal Year End Date | --12-31 |
Document Fiscal Year Focus | 2025 |
Document Fiscal Period Focus | Q2 |
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