POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes
and appoints Philip H. Peacock, Anne V. Bruner, Rachelle Maniago-Earls
and Courtney H. Landry, 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 of Anadarko Petroleum Corporation (the "Company"),
Forms ID, 3, 4 and 5, pursuant to Section 16(a) of the Securities Exchange
Act of 1934 and the rules thereunder, and Form 144, pursuant to Rule 144
under the Securities Act of 1933 and the rules thereunder, if required; and

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 Form 3,
Form 4, Form 5 or Form 144 and timely 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 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 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
attorney-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16(a) of the Securities
Exchange Act of 1934 or Rule 144 of the Securities Act of 1933.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer an officer of the Company unless earlier revoked
by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact; provided, however, this Power of Attorney will expire
immediately upon the termination of employment of any attorney-in-fact
as to that attorney-in-fact only, but not as to any other appointed
attorney-in-fact hereunder.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 22nd day of August, 2018.

/s/AMANDA M. MCMILLIAN

Amanda M. McMillian