XML 94 R76.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Loan Losses And Related Loan Amounts) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2021 | Jan. 01, 2020 | Jan. 01, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 992 |  |  |  | $ 668 | $ 992 | $ 668 | $ 701 |  |  |
Provision for loan losses | $ (25) | $ (42) | $ (135) | (182) | $ (17) | $ 5 | $ 138 | 411 | (384) | 537 | 74 |  |  |
Balance at end of period | $ 618 |  |  |  | $ 992 |  |  |  | $ 618 | $ 992 | $ 668 |  |  |
As a percentage of total loans | 1.26% |  |  |  | 1.90% |  |  |  | 1.26% | 1.90% | 1.33% |  |  |
As a percentage of total loans excluding PPP Loans | 1.27% |  |  |  | 2.03% |  |  |  | 1.27% | 2.03% |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in business loans allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (42) | $ 0
Increase in retail loans allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  | 0 | 25 | 0
Day-one decrease in the overall allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (17) | $ 0
Financing Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 948 |  |  |  | 637 | $ 948 | $ 637 | $ 671 |  |  |
Loan charge-offs |  |  |  |  |  |  |  |  | (70) | (238) | (152) |  |  |
Recoveries on loans previously charged-off |  |  |  |  |  |  |  |  | 80 | 42 | 45 |  |  |
Net loan (charge-offs) recoveries |  |  |  |  |  |  |  |  | 10 | (196) | (107) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (370) | 524 | 73 |  |  |
Balance at end of period | $ 588 |  |  |  | $ 948 |  |  |  | $ 588 | $ 948 | $ 637 |  |  |
As a percentage of total loans | 1.19% |  |  |  | 1.81% |  |  |  | 1.19% | 1.81% | 1.27% |  |  |
As a percentage of total loans excluding PPP Loans | 1.20% |  |  |  | 1.94% |  |  |  | 1.20% | 1.94% |  |  |  |
Unused Commitments to Extend Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 44 |  |  |  | 31 | $ 44 | $ 31 | $ 30 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (14) | 13 | 1 |  |  |
Balance at end of period | $ 30 |  |  |  | $ 44 |  |  |  | 30 | 44 | 31 |  |  |
Business loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 930 |  |  |  | 629 | 930 | 629 | 653 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (384) | 538 | 83 |  |  |
Balance at end of period | $ 555 |  |  |  | $ 930 |  |  |  | $ 555 | $ 930 | $ 629 |  |  |
As a percentage of total loans | 1.22% |  |  |  | 1.93% |  |  |  | 1.22% | 1.93% | 1.37% |  |  |
As a percentage of total loans excluding PPP Loans | 1.24% |  |  |  | 2.08% |  |  |  | 1.24% | 2.08% |  |  |  |
Business loans | Financing Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 895 |  |  |  | 601 | $ 895 | $ 601 | $ 627 |  |  |
Loan charge-offs |  |  |  |  |  |  |  |  | (67) | (233) | (147) |  |  |
Recoveries on loans previously charged-off |  |  |  |  |  |  |  |  | 76 | 38 | 40 |  |  |
Net loan (charge-offs) recoveries |  |  |  |  |  |  |  |  | 9 | (195) | (107) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (373) | 531 | 81 |  |  |
Balance at end of period | $ 531 |  |  |  | $ 895 |  |  |  | $ 531 | $ 895 | $ 601 |  |  |
As a percentage of total loans | 1.17% |  |  |  | 1.85% |  |  |  | 1.17% | 1.85% | 1.30% |  |  |
As a percentage of total loans excluding PPP Loans | 1.18% |  |  |  | 2.00% |  |  |  | 1.18% | 2.00% |  |  |  |
Business loans | Unused Commitments to Extend Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 35 |  |  |  | 28 | $ 35 | $ 28 | $ 26 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (11) | 7 | 2 |  |  |
Balance at end of period | $ 24 |  |  |  | $ 35 |  |  |  | 24 | 35 | 28 |  |  |
Retail loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 62 |  |  |  | 39 | 62 | 39 | 48 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | (1) | (9) |  |  |
Balance at end of period | $ 63 |  |  |  | $ 62 |  |  |  | $ 63 | $ 62 | $ 39 |  |  |
As a percentage of total loans | 1.63% |  |  |  | 1.55% |  |  |  | 1.63% | 1.55% | 0.91% |  |  |
Retail loans | Financing Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 53 |  |  |  | 36 | $ 53 | $ 36 | $ 44 |  |  |
Loan charge-offs |  |  |  |  |  |  |  |  | (3) | (5) | (5) |  |  |
Recoveries on loans previously charged-off |  |  |  |  |  |  |  |  | 4 | 4 | 5 |  |  |
Net loan (charge-offs) recoveries |  |  |  |  |  |  |  |  | 1 | (1) | 0 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 3 | (7) | (8) |  |  |
Balance at end of period | $ 57 |  |  |  | $ 53 |  |  |  | $ 57 | $ 53 | $ 36 |  |  |
As a percentage of total loans | 1.47% |  |  |  | 1.32% |  |  |  | 1.47% | 1.32% | 0.84% |  |  |
Retail loans | Unused Commitments to Extend Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 9 |  |  |  | $ 3 | $ 9 | $ 3 | $ 4 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (3) | 6 | (1) |  |  |
Balance at end of period | $ 6 |  |  |  | $ 9 |  |  |  | $ 6 | $ 9 | $ 3 |  |  |

X
- Definition Day-one decrease in the overall allowance for credit losses + References No definition available. + Details
Name: | cma_Dayonedecreaseintheoverallallowanceforcreditlosses
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The ratio of Allowance for Credit Losses to All Loans. + References No definition available. + Details
Name: | cma_FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans
Namespace Prefix: | cma_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Financing Receivable, Ratio of Allowance for Loan Losses to All Loans excluding PPP Loans + References No definition available. + Details
Name: | cma_FinancingReceivableRatioOfAllowanceForLoanLossesToAllLoansExcludingPPPLoans
Namespace Prefix: | cma_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase in retail loans allowance for credit losses + References No definition available. + Details
Name: | cma_Increaseinretailloansallowanceforcreditlosses
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reduction in business loans allowance for credit losses + References No definition available. + Details
Name: | cma_Reductioninbusinessloansallowanceforcreditlosses
Namespace Prefix: | cma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_FinanceReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |