XML 95 R79.htm IDEA: XBRL DOCUMENT
v3.22.4

Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash received as collateral for derivative assets | $ 185 |  |
Fair value of securities pledged as collateral for derivative assets | 202 |  |
Cash posted as collateral for derivative liabilities | 4 |  |
Net cash flow hedge gains included in interest and fees on loans | (25) | $ 95 | $ 70
Price alignment income | 8 |  |
Net gain on open foreign currency positions | 0 | 0 | $ 0
Allowance for credit losses on lending-related commitments | 51 | 30 |
Allowance for credit losses on lending-related commitments, unused commitments to extend credit | $ 44 | 27 |
Final year of expiration for outstanding letters of credit | 2029 |  |
Risk participation agreements covering standby and commercial letters of credit | $ 107 | 98 |
Standby and commercial letters of credit outstanding | 3,800 | 3,400 |
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities | 35 | 32 |
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities | 28 | 29 |
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit | 7 | 3 |
Notional Amount of Derivative Credit Risk Participation Agreements | $ 951 | 1,100 |
Fair Value Amount of Derivative Credit Risk Participation Agreements |  | 1 |
Maximum estimated exposure to credit risk participation agreements assuming 100% default |  | 30 |
Weighted average remaining maturity of credit risk participation agreements, in years | 3 years 9 months 18 days |  |
Recurring |  |  |
Total liabilities at fair value | $ 1,799 | 873 |
Level 3 | Recurring |  |  |
Total liabilities at fair value | $ 12 | $ 13 |

X
- Definition Allowance For Off Balance Sheet Credit Losses + References No definition available. + Details
Name: | cma_AllowanceForOffBalanceSheetCreditLosses
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities on the consolidated balance sheet. + References No definition available. + Details
Name: | cma_CarryingValueOfStandbyAndCommercialLettersOfCredit
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of standby and commercial letters of credit included in the allowance for lending-related commitments. + References No definition available. + Details
Name: | cma_CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of standby and commercial letters of credit included in deferred fees. + References No definition available. + Details
Name: | cma_CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of unused commitments to extend credit, included in the allowance for credit losses on lending-related commitments. + References No definition available. + Details
Name: | cma_CarryingValueOfUnusedCommitmentsToExtendCredit
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash Collateral Posted For Derivatives In Liability Position. Includes both the amount of cash offset against derivative liabilities under master netting arrangments and amounts not offset. + References No definition available. + Details
Name: | cma_CashCollateralPostedForDerivativesInLiabilityPosition
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total value of cash collateral received from counterparties to secure the fair value of derivative contracts in an unrealized gain position. Includes both the amount offset against derivative assets under master netting arrangements as well as cash collateral that has not been offset. + References No definition available. + Details
Name: | cma_DerivativeAssetsCashCollateral
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value Amount of Derivative Credit Risk Participation Agreements + References No definition available. + Details
Name: | cma_FairValueAmountOfDerivativeCreditRiskParticipationAgreements
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Longest Expiration Year Letters Of Credit + References No definition available. + Details
Name: | cma_LongestExpirationYearLettersOfCredit
Namespace Prefix: | cma_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notional amount of derivative credit risk participation agreements under which the participant assumes counterparty credit exposure associated with a borrower's performance related to certain derivative contracts. + References No definition available. + Details
Name: | cma_NotionalAmountOfDerivativeCreditRiskParticipationAgreements
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Price alignment income + References No definition available. + Details
Name: | cma_PriceAlignmentIncome
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total risk participations with third parties covering standby and commercial letters of credit outstanding. + References No definition available. + Details
Name: | cma_RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Average period covered by credit risk derivative contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
Name: | us-gaap_AverageTermOfCreditRiskDerivatives1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
Name: | us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of securities received as collateral against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
Name: | us-gaap_DerivativeAssetFairValueOfCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
Name: | us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e640-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |