POWER OF ATTORNEY

	The undersigned hereby authorizes and designates each of Sylvia J. Kerrigan,
Richard J. Kolencik and Yvonne R. Kunetka (the "Attorneys") as his fully
authorized attorney  for the purpose of signing and filing on behalf of the
undersigned all forms which are permitted or required to be filed pursuant to
Section 16 of the Securities Exchange Act of 1934, as amended (the "Forms")
concerning the undersigned's interest in securities of Marathon Oil Corporation
("MOC") and/or the undersigned's status with respect to MOC.  This Power of
Attorney authorizes each of the Attorneys to sign and file the Forms on behalf
of the undersigned from the date hereof until the undersigned ceases to be
subject to Section 16 of the Securities Exchange Act of 1934 by virtue of having
been a director and officer of MOC.

Signed in the City of Houston, State of Texas on October 28, 2009

                                                                          _/s/
Clarence P. Cazalot, Jr._________

Clarence P. Cazalot, Jr.