Power of Attorney
John D. Lewis

Know all by these presents, that the undersigned hereby
constitutes and appoints each of Jon W. Bilstrom,
Carol H. Rodriguez and Nicole V. Gersch,
signing singly, the undersigned's true and lawful
attorney-in-fact to:


(1)	execute for and on behalf of the undersigned,
in the undersigned's capacity as an officer and/or director
of Comerica Incorporated (the "Company"), Forms 3, 4 and 5
in accordance with Section 16(a) of the Securities Exchange
Act of 1934 and the rules thereunder;

(2)	execute for and on behalf of the undersigned,
in the undersigned's capacity as an officer and/or director
of the Company, documents necessary to facilitate the
filing of Forms 3, 4 and 5;

(3)	do and perform any and all acts for and on behalf
of the undersigned which may be necessary or desirable to
complete and execute any such Form 3, 4 or 5 and timely file
such form with the United States Securities and Exchange
Commission and any stock exchange or similar authority; and

(4)	take any other action of any type whatsoever in
connection with the foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to, in the best interest
of, or legally required by, the undersigned, it being
understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to
this Power of Attorney shall be in such form and shall contain
such terms and conditions as such attorney-in-fact may approve
in such attorney-in-fact's discretion.


The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein granted, as fully
to all intents and all purposes as the undersigned might or could
do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-in-fact,
in serving in such capacity at the request of the undersigned,
are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934.


The termination of any attorney-in-fact's employment by
the Company, however caused, shall operate as a termination of his
or her powers and authorities hereunder, but shall not affect the
powers and authorities herein granted to any other party.

This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to file
Forms 3, 4 and 5 with respect to the undersigned's holdings of
and transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact at the then current mailing
address of the Corporate Legal Department of Comerica Incorporated.

All Powers of Attorney previously granted in connection
with the foregoing matters hereby are canceled and revoked.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed and made effective as of this 18th day
of May, 2004.



/s/ John D. Lewis