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Short-term Borrowings Short-term Borrowings (Narrative) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Short-Term Debt [Abstract]
Pledged to the FHLB as collateral for potential future borrowings - real estate related loans	$ 9,500
Pledged to the FHLB as collateral for potential future borrowings - investment securities	1,000
Potential future borrowings	7,200
Pledged loans to provide collateralized borrowing with the FRB	24,500
Available collateralized borrowing with the FRB	$ 19,600

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_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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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X

- 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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- Definition

Fair value of liabilities arising from or related to a financial instrument held by the entity for its own account (proprietary securities) which has been pledged to counterparties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=126970911&loc=SL6283291-111563

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- References

No definition available.

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