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Credit Quality And Allowance For Credit Losses Foreclosed Properties (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Nonaccrual Loans [Abstract]
Foreclosed property	$ 0	$ 1

X

- Definition

Nonaccrual Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	cma_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522

+ Details

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Balance Type:	debit
Period Type:	instant