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Medium- And Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Pledged to the FHLB as collateral for potential future borrowings - real estate related loans	$ 18,100
Pledged to the FHLB as collateral for potential future borrowings - investment securities	1,300
Potential future borrowings	10,500
Unamortized debt issuance cost	$ 6	$ 7

X

- Definition

Pledged to the FHLB as collateral for potential future borrowings - investment securities

+ References

No definition available.

+ Details

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X

- Definition

Pledged to the FHLB as collateral for potential future borrowings - real estate related loans

+ References

No definition available.

+ Details

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Namespace Prefix:	cma_
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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

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Balance Type:	credit
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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

+ Details

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