XML 91 R75.htm IDEA: XBRL DOCUMENT
v3.22.4

Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Schedule of Automotive Industry Outstanding Loans and Total Exposure) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Concentration Risk [Line Items] |  |  |
Total automotive loans | $ 6,435 | $ 5,274 |
Total automotive exposure | 12,938 | 12,706 |
Automotive Production |  |  |
Concentration Risk [Line Items] |  |  |
Total automotive loans | 1,068 | 1,112 | [1]
Total automotive exposure | 2,028 | 2,041 | [1]
Automotive Dealer |  |  |
Concentration Risk [Line Items] |  |  |
Total automotive loans | 5,367 | 4,162 |
Total automotive exposure | $ 10,910 | $ 10,665 |
[1] | Excludes PPP loans

X
- Definition Total automotive exposure including loans and other credit commitments to automotive dealers and to borrowers involved with automotive production. + References No definition available. + Details
Name: | cma_TotalAutomotiveExposure
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total automotive loans including loans to automotive dealers and to borrowers involved with automotive production. + References No definition available. + Details
Name: | cma_TotalAutomotiveLoans
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis=cma_AutomotiveProductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis=cma_AutomotiveDealerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |