Know all by these presents, that the undersigned hereby constitutes and appoints

each of Edward C.  Lee, William C. Baskin III, and Adam F. McAnaney, 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 Aetna Inc., a Pennsylvania

corporation (Aetna) Forms 3, 4, and 5 in accordance with

 Section 16(a) of the Securities Exchange Act of 1934 and the rules

thereunder;



(2) 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 Forms 3, 4, or 5, complete and execute any

amendment or amendments thereto, and file such form with the

United States Securities and Exchange Commission and any stock

exchange or similar authority; and



(3) 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 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.



 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 Aetna, unless earlier revoked by the

undersigned in a signed writing delivered to the foregoing attorneys-in-fact.



 IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed as of this 1st day of December, 2017.











 Frank M. Clark