    <SEC-DOCUMENT>0000028412-22-000150-index.html : 20220909
    <SEC-HEADER>0000028412-22-000150.hdr.sgml : 20220909
    <ACCEPTANCE-DATETIME>20220909161620
    ACCESSION NUMBER:		0000028412-22-000150
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		31
    CONFORMED PERIOD OF REPORT:	20220909
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20220909
    DATE AS OF CHANGE:		20220909

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			COMERICA INC /NEW/
    		CENTRAL INDEX KEY:			0000028412
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				000006021
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-10706
    		FILM NUMBER:		221236376

    	BUSINESS ADDRESS:
    		STREET 1:		1717 MAIN STREET MC6404
    		STREET 2:		ATTN: DARLENE PERSONS
    		CITY:			DALLAS
    		STATE:			TX
    		ZIP:			75201
    		BUSINESS PHONE:		214-462-6831

    	MAIL ADDRESS:
    		STREET 1:		1717 MAIN STREET MC6404
    		STREET 2:		ATTN: DARLENE PERSONS
    		CITY:			DALLAS
    		STATE:			TX
    		ZIP:			75201

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	DETROITBANK CORP
    		DATE OF NAME CHANGE:	19850311
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>cma-20220909.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: cma-20220909.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>comericaincbarclaysconfe.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: comericaincbarclaysconfe.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>cma-20220909.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: cma-20220909.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>cma-20220909_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: cma-20220909_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>cma-20220909_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: cma-20220909_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>comericaincbarclaysconfe001.jpg
    <TEXT>
    Document 6 - file: comericaincbarclaysconfe001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>comericaincbarclaysconfe002.jpg
    <TEXT>
    Document 7 - file: comericaincbarclaysconfe002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>comericaincbarclaysconfe003.jpg
    <TEXT>
    Document 8 - file: comericaincbarclaysconfe003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>comericaincbarclaysconfe004.jpg
    <TEXT>
    Document 9 - file: comericaincbarclaysconfe004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>comericaincbarclaysconfe005.jpg
    <TEXT>
    Document 10 - file: comericaincbarclaysconfe005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>comericaincbarclaysconfe006.jpg
    <TEXT>
    Document 11 - file: comericaincbarclaysconfe006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>comericaincbarclaysconfe007.jpg
    <TEXT>
    Document 12 - file: comericaincbarclaysconfe007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>comericaincbarclaysconfe008.jpg
    <TEXT>
    Document 13 - file: comericaincbarclaysconfe008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>comericaincbarclaysconfe009.jpg
    <TEXT>
    Document 14 - file: comericaincbarclaysconfe009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>comericaincbarclaysconfe010.jpg
    <TEXT>
    Document 15 - file: comericaincbarclaysconfe010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>comericaincbarclaysconfe011.jpg
    <TEXT>
    Document 16 - file: comericaincbarclaysconfe011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>comericaincbarclaysconfe012.jpg
    <TEXT>
    Document 17 - file: comericaincbarclaysconfe012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>comericaincbarclaysconfe013.jpg
    <TEXT>
    Document 18 - file: comericaincbarclaysconfe013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>comericaincbarclaysconfe014.jpg
    <TEXT>
    Document 19 - file: comericaincbarclaysconfe014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>comericaincbarclaysconfe015.jpg
    <TEXT>
    Document 20 - file: comericaincbarclaysconfe015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>comericaincbarclaysconfe016.jpg
    <TEXT>
    Document 21 - file: comericaincbarclaysconfe016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>comericaincbarclaysconfe017.jpg
    <TEXT>
    Document 22 - file: comericaincbarclaysconfe017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>comericaincbarclaysconfe018.jpg
    <TEXT>
    Document 23 - file: comericaincbarclaysconfe018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>25
    <FILENAME>cma-20220909_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: cma-20220909_htm.html

    Document 25 - RAW XML: cma-20220909_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>26
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>27
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>28
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>29
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 29 - file: FilingSummary.html

    Document 29 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>31
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 31 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>32
    <FILENAME>0000028412-22-000150-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 32 - file: 0000028412-22-000150-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>