XML 65 R40.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Significant Group Concentrations of Credit Risk [Abstract] |
Schedule of Automotive Industry Outstanding Loans and Total Exposure | The following table summarizes the Corporation's commercial real estate loan portfolio by loan category.
(in millions) |  |  |
December 31 | 2024 |  | 2023
Real estate construction loans: |  |  |
Commercial Real Estate business line (a) | $ | 3,358 |  |  | $ | 4,570 |
Other business lines (b) | 322 |  |  | 513 |
Total real estate construction loans | 3,680 |  |  | 5,083 |
Commercial mortgage loans: |  |  |
Commercial Real Estate business line (a) | 6,044 |  |  | 4,727 |
Other business lines (b) | 8,449 |  |  | 8,959 |
Total commercial mortgage loans | 14,493 |  |  | 13,686 |
Total commercial real estate loans | $ | 18,173 |  |  | $ | 18,769 |
Total unused commitments on commercial real estate loans | $ | 3,130 |  |  | $ | 4,382 |
(a)Primarily loans to real estate developers. (b)Primarily loans secured by owner-occupied real estate.
Schedule of Commercial Real Estate Loans and Unused Commitments | Outstanding loans, included in commercial loans on the Consolidated Balance Sheets, and total exposure (outstanding loans, unused commitments and standby letters of credit) to companies related to the automotive industry were as follows:
(in millions) |  |  |
December 31 | 2024 |  | 2023
Automotive loans: |  |  |
Production | $ | 764 |  |  | $ | 848 |
Dealer | 5,513 |  |  | 6,191 |
Total automotive loans | $ | 6,277 |  |  | $ | 7,039 |
Total automotive exposure: |  |  |
Production | $ | 1,661 |  |  | $ | 1,744 |
Dealer | 8,675 |  |  | 10,418 |
Total automotive exposure | $ | 10,336 |  |  | $ | 12,162 |

X
- Definition Outstanding loans and total exposure from Automotive industry. + References No definition available. + Details
Name: | cma_SchedulesOfConcentrationOfRiskOutstandingLoansAndTotalExposureFromLoansAutomotiveTableTextBlock
Namespace Prefix: | cma_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Outstanding loans and unused commitments from Commercial Real Estate. + References No definition available. + Details
Name: | cma_SchedulesOfConcentrationOfRiskOutstandingLoansAndUnusedCommitmentsFromCommercialRealEstateTableTextBlock
Namespace Prefix: | cma_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Group Concentrations of Credit Risk [Abstract] + References No definition available. + Details
Name: | cma_SignificantGroupConcentrationsOfCreditRiskAbstract
Namespace Prefix: | cma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration