Document:

<PAGE>

Exhibit 10(i)

                                                                 August 8,  2001

Mr. Thomas J. Usher
600 Grant Street
Suite 6100
Pittsburgh, PA 15219-4776

Dear Tom,

In connection with the separation of the businesses, of the U.S. Steel Group and
Marathon Group pursuant to the Agreement and Plan of Reorganization approved by
the Board of Directors on July 31, 2001 (Separation) and your agreement to serve
as Chairman, Chief Executive Officer and President of United States Steel
Corporation (USSC), Chairman of the Board of Directors of Marathon Oil
Corporation (Marathon) and Chairman of the Board of Managers of Marathon Ashland
Petroleum LLC (MAP), I am authorized to extend to you, on behalf of the
Compensation Committee of USX Corporation (USX), this Completion and Retention
Agreement (Agreement), effective as of the date stated above.

The terms and conditions of our Agreement are as follows.

1.   If the Separation occurs, you will receive a salary from USSC of $1,100,000
     for each of years 2000 through 2004, subject to adjustment by the Board of
     Directors of USSC, or a committee thereof.

2.   Subject to the completion of the Separation, you will receive:

     (a)  a restructuring completion bonus of $6,000,000 payable by Marathon on
          the first business day after the effective time of the Separation; and

     (b)  a retention bonus payable by USSC on the third anniversary of the
          effective time of the Separation. This retention bonus is capped at
          $3,000,000 and is further subject to the following performance
          measures and limitations authorized in (i) and (ii) below.

          (i)  On the third anniversary of the effective time of the Separation,
               (A) the fair value of the aggregate assets of USSC exceeds its
               total liabilities, (B) the fair saleable value of the aggregate
               assets of USSC exceed its probable liabilities, and (C) USSC is
               able to pay and discharge its debts and other liabilities as they
               become due. The satisfaction of the forEgoing performance
               measures shall be determined solely by the Board of Directors of
               USSC, or the Compensation Committee thereof.

          (ii) In the event the conditions under 2(b)(i) are satisfied, the
               retention bonus of $3,000,000 shall be further subject to the
               performance-related vesting criteria applicable to restricted
               stock under the USSC 2002 Stock Plan (Plan). Based on a
               three-year rolling average of comparator-company performances and
               the performance criteria established in Appendix A to the Plan,
               the Compensation Committee shall determine the percentage (not to
               exceed 100%) to be applied to the $3,000,000 retention bonus.
<PAGE>

3.   Subject to completion of the Separation in addition to the normal director
     fees paid to non-employee directors, you will receive a $25,000 annual fee
     from Marathon for serving as Chairman of the Board of Marathon and Chairman
     of the MAP Board of Managers.

4.   A grant of 90,000 restricted shares of USX-Marathon Group Common Stock with
     (a) 30,000 shares subject to vesting on the first anniversary hereof based
     on the 2001 performance of USX under the USX Stock Plan as determined by
     the Compensation Committee on May 2, 2002, (b) 30,000 shares subject to
     vesting in May 2003 based on the 2002 performance of Marathon under the
     Marathon Stock Plan as determined by the Marathon Compensation Committee in
     May 2003, and (c) 30,000 shares subject to vesting in May 2004 based on the
     2003 performance of Marathon under the Marathon Stock Plan as determined by
     the Marathon Compensation Committee in May 2004.

5.   Subject to the completion of the Separation, a grant of phantom stock
     appreciation rights for 500,000 shares of Marathon common stock. The
     exercise price of 150,000 shares will be based on the average of the high
     and low market price of USX-Marathon Group Stock Common Stock on the last
     trading day before the effective time of the Separation, and the exercise
     price of 350,000 shares will be based on the average of the high and low
     market price of Marathon common stock on the first trading day after the
     effective time of the Separation. The effective date of each grant will be
     same date as the determination of the exercise price. These stock
     appreciation rights will vest on the effective date of the grant and will
     expire on the earlier of ten years from the effective date of grant, nine
     years following retirement or three years following death while employed.
     These rights will be paid in cash upon exercise.

6.   Subject to completion of the Separation, if you elect to receive your
     non-qualified pension plan as a lump sum distribution, the applicable
     interest rate and mortality table in effect for retirements on December 31,
     2001 will be used to calculate the amount of such pension instead of the
     applicable interest rate and mortality table in effect at the time of your
     retirement, which could be greater or less than such rate.

7.   Other provisions. The following provisions are further subject to the
     ----------------
     completion of the Separation.

     (a)  In the event of any merger, consolidation or other business
          combination involving USSC which has not been approved by the Board of
          Directors of USSC, all benefits payable hereunder shall immediately
          become due and payable.

     (b)  This Agreement shall be binding upon and inure to the benefit of the
          parties hereto and their respective successors and assigns. Your
          rights hereunder are not assignable. We may assign our rights or a
          portion thereof to USSC or to any successor to USSC in a transaction
          approved by the Board of Directors of USSC.

     (c)  Except as otherwise provided herein, in the event of your death prior
          to the satisfaction of any benefit payable hereunder, any such benefit
          that remains unsatisfied at such date shall immediately become due and
          payable, including the vesting of any restricted stock or stock
          appreciation rights.

                                        2
<PAGE>

     (d)  In the event that you voluntarily leave the employment of USSC on or
          before December 31, 2004, the benefits payable under paragraphs 1 and
          3 hereof shall be pro-rated based on the elapsed.

     (e)  You agree that you will dedicate your full attention and efforts to
          the management and direction of both Marathon and USSC and that you
          will be diligent in acting in the best interests of these
          organizations.

     (f)  We reserve the right to terminate this Agreement for good cause.

Except for your salary set forth in paragraph 1 hereof, it is further understood
that the foregoing benefits are not benefit bearing under any tax-qualified or
non tax-qualified plan of USX, Marathon, USSC or MAP.

Because of your extensive experience and personal qualities, you can make a
unique and valuable contribution to the future of Marathon and USSC. If the
terms and conditions herein are acceptable, please sign below.

                                                   Sincerely,

                                                   USX CORPORATION

                                                   By: /s/ Seth E.Schofield
                                                       --------------------
                                                       Seth E.Schofield
                                                        On Behalf of the
                                                        Compensation Committee
                                                        Of USX Corporation,
                                                        predecessor to Marathon
                                                        Oil Corporation

Agreed to and Accepted this 8th day of August, 2001.
                            ---

/s/ Thomas J. Usher
------------------------------
   Thomas J. Usher

UNITED STATES STEEL LLC, predecessor
to United States Steel Corporation

Agreed to and Acknowledged

By: /s/ E.F. Guna
---------------------
Name:E.F. Guna
---------------------
Title: Vice President
---------------------
Date: August 8, 2001
---------------------

                                      3<PAGE>

Exhibit 10(j)

Mr. John P. Surma
2006 Hycroft Drive
Pittsburgh, PA 15241

December 21, 2001

Dear John,

In furtherance of your employment letter dated January 27, 1997, and in
consideration for your agreeing to act as Vice Chairman of United States Steel
Corporation effective January 1, 2002 (or such later date on which the USX
Corporation Board of Directors approves the restructure of USX), USX
Corporation, renamed Marathon Oil Corporation effective upon the USX restructure
("Marathon"), United States Steel LLC ("Steel"), Marathon Ashland Petroleum LLC
("MAP"), Speedway SuperAmerica LLC ("SSA"), and their successors (collectively,
the "Corporation") agree to provide the non-qualified benefit supplements
outlined in Section A below. The supplements payable under this letter agreement
("Agreement") are in addition to the pension and savings benefits and
non-qualified deferred compensation that you are otherwise entitled to as an
executive employee of the Corporation.

Unless you elect otherwise in accordance with Section B below, the supplements
payable under this Agreement shall be paid by Steel and Marathon in the form of
a lump sum distribution within 90 days of the date of your termination of
employment from all employers of the Corporation (or, if earlier, the date of
your death). Any such lump sum distribution shall be calculated in the same
manner as it would have been calculated had it been made under the Steel or
Marathon pension plan, as applicable. If you die prior to receipt of such lump
sum, such lump sum will be paid to your surviving spouse or to your estate if
there is no surviving spouse.

A.   Pension and Savings Benefits - Attributable to Bonus Service Steel and
     ----------------------------
     Marathon shall provide non-qualified benefit supplements equal to the
     difference between (1) the Adjusted Benefits, and (2) the Actual Benefits,
     as outlined below.

     (1)  Adjusted Benefits
          -----------------

          The term "Adjusted Benefits" shall mean the pension (and surviving
          spouse and survivor) or savings benefits that would be provided to you
          under the Steel Plans and the Marathon Plans specified in Exhibit A
          attached if your actual continuous service with the Corporation is
          adjusted to reflect an increase of fifteen (15) years of continuous
          service. As outlined in Exhibit A, such bonus years will be used for
          purposes of determining eligibility and vesting for both the Steel
          Plans and Marathon Plans. For benefit accrual purposes, the fifteen
          bonus years of service will be allocated between Steel and Marathon
          (and their plans) based upon the ratio of the number of months of
          service you have worked for Steel or Marathon, respectively, as
          compared to the combined number of months of service you have worked
          for Steel and Marathon as of the determination date.

          Solely for purposes of determining the above-described allocation
          ratio, years of service with USX prior to the USX restructure will be
          counted as service for Steel and years of service with MAP and SSA
          shall be counted as service for Marathon. The determination date shall
          be the date of your termination of employment (or, if earlier, the
          date of your death). A partial month of service shall be counted as a
          month if it includes at least 15 days of service.

     (2)  Actual Benefit
          --------------

          The term "Actual Benefits" shall mean the pension (and surviving
          spouse and survivor) and savings benefits that are provided to you
          under the Steel Plans and the Marathon Plans specified in Exhibit A as
          of the determination date.
<PAGE>

     For purposes of determining the amounts in (1) and (2) above, benefits will
     be based upon the amount of immediate benefit payable in the form of a lump
     sum distribution under the terms of the applicable plan.

B.   Alternative Forms of Benefit
     ----------------------------

     You may receive all or a portion of the supplements payable by Steel or
     Marathon under this Agreement in one or more alternative forms of benefit
     if you make an election to do so at least one year prior to the date of
     your retirement from the Corporation (or, if earlier, from the date of your
     death). Any alternative form of benefit must be approved by the Corporation
     and may include, for example, the alternatives outlined below. To be valid,
     any such election must be received in writing and approved by the Vice
     President-Employee Relations of Steel and/or Marathon, as applicable.

     (1)  Installments
          ------------

          In accordance with the terms of a valid election, the benefit payable
          under this Agreement may be paid either:

          (a)  in full on February 1 of the year following the year in which you
               retire, or

          (b)  in up to ten annual installments with the first annual
               installment payable within 90 days following the date of your
               retirement and the succeeding installments payable on the next
               anniversary(ies) of the first payment date.

          Interest would accrue and be payable on the balance due at the rate
          used to determine the actuarially equivalent lump sum value of your
          benefit under the Steel or Marathon pension plan, as applicable. If
          you die prior to receipt of the remaining installments, such remaining
          installments shall be paid to your surviving spouse or to your estate
          if there is no surviving spouse.

          Subject to a 2% penalty, you may elect to accelerate the payment of
          all remaining installments to a date prior to the scheduled date. If
          such an election is made, the accelerated payment would be reduced by
          an amount equal to 2% of the amounts accelerated (including interest).
          Such an election for acceleration of any balance due will be valid
          only if it is filed in writing with the appropriate Vice President
          -Employee Relations at least 20 days prior to the date payment is
          requested.

     (2)  Split Dollar Life Insurance
          ---------------------------

          In accordance with the terms of a valid election, you may waive your
          right to all or a portion of the benefits payable by Steel and/or
          Marathon under this Agreement in return for split dollar life
          insurance coverage under terms to be subsequently determined by Steel
          or Marathon.

C.   Deferred Compensation Arrangements
     ----------------------------------

     As with other similarly situated former employees, Marathon agrees that you
     will be treated the same as an employee transferred to an employer within
     the Marathon Oil Corporation controlled group of corporations for purposes
     of the MAP and SSA Deferred Compensation Arrangements outlined in Exhibit B
     attached. In this regard, no distributions under these Arrangements will be
     permitted or required solely as a result of the separation of USX
     Corporation.

Consistent with the terms of the January 27, 1997 letter agreement, Marathon
agrees to provide the non-qualified benefit supplement under this Agreement that
is payable by Steel to the extent, if any, that such supplement is not paid by
Steel within 60 days of the due date. In such event, Marathon shall pay such
unpaid portion within 60 days of the date that you notify Marathon that Steel
has failed to satisfy its obligation under this Agreement.
<PAGE>

For your information, attached as Exhibit B is a list of the pension and savings
plans and non-qualified deferred compensation arrangements in which you are
currently participating.

Sincerely,

/s/ T.J. Usher

T.J. Usher

                  Agreed to:  /s/  John P. Surma               December 21, 2001
                              --------------------
                              John P. Surma
<PAGE>

                                                                       Exhibit A
                                                                       ---------

               John P. Surma Letter Agreement - December 21, 2001
               ------------------------------   -----------------
 Application of Bonus Service to Steel and Marathon Plans (and their successors)

<TABLE>
<CAPTION>
                                                                       Adjusted Benefit under Letter Agreement
                                                      -------------------------------------------------------------------------

                     Plans                               Eligibility and Vesting                    Benefit Accrual
---------------------------------------------------   ------------------------------   ----------------------------------------
<S>                                                   <C>                              <C>
Steel Plans
-----------
 USS Plan for Non-Union Employee Pension Benefits     15 years of bonus service        Steel's pro rata portion/1/ of
                                                                                        15 bonus years

 USS Corporation Non-Tax Qualified Pension  Plan      15 years of bonus service        Steel's pro rata portion of
                                                                                        15 bonus years

 USS Corporation Executive Management
  Supplemental Pension Program                        15 years of bonus service        Steel's pro rata portion of
                                                                                        15 bonus years

 USS Corporation Supplemental Thrift Program          15 years of bonus service
                                                      (provides higher Co. match)      No impact

Marathon Plans
--------------
 Retirement Plan of Marathon Oil Company              15 years of bonus service        No impact. (Marathon's pro rata
                                                                                        portion of 15 bonus years is used in
                                                                                        hypothetical MAP Ret. Plan unreduced
                                                                                        for Marathon Retirement Plan offset)/2/

 Marathon Oil Company Excess Benefits Plan            15 years of bonus service        No impact

 Refining, Marketing, and Transportation Subplan of
  Marathon Ashland Petroleum Retirement Plan          15 years of bonus service        Marathon's pro rata portion of
                                                                                        15 bonus years

 Marathon Ashland Petroleum Excess Benefits Plan      15 years of bonus service        Marathon's pro rata portion of
                                                                                        15 bonus years

 Retail Subplan of Marathon Ashland Petroleum Plan
  -  Petroleum Marketing Legacy Provisions            15 years of bonus service        No impact
                                                      15 years of bonus service        No impact on number of accrual years
  -  Pension Equity Provisions                        (provides higher accrual rate)

Speedway SuperAmerica Excess Benefits Plan            15 years of bonus service        No impact
</TABLE>

----------
/1 Pro rata portion is determined as of the determination date based upon the
ratio of the number of months of service for Steel (including pre-2002 USX) or
Marathon, respectively as compared to the combined number of months of service
for Steel and Marathon. Determination data is the date of retirement (or, if
earlier, date of death)./

/2 The term"Marathon's pro rata portion" refers to the portion allocable
to service with Marathon, MAP, and SSA./
<PAGE>

                                                                       Exhibit B
                                                                       ---------

            John P. Surma - Applicable Pension and Savings Plans and
            -------------
            Deferred Compensation Arrangements (and their successors)

<TABLE>
<CAPTION>
                                                                              Summary of Benefits
                                                ------------------------------------------------------------------------------

                                                Estimated Lump Active
                Plans                             Sum Value-7/1/01       Participation                 Explanation
--------------------------------------------    ---------------------    -------------    ------------------------------------
<S>                                               <C>                    <C>              <C>
Steel Plans
-----------
1.   USS Non-Union Employee Pension Plan                         0           9/01 -       DB pension on non-bonus compensation
2.   USS Non-Tax Qualified Pension Plan                          0           9/01 -       Excess/1/ not payable under Plan 1
                                                                                           [Non-Qual.]
3.   USS Supplemental Pension Program                            0           9/01 -       DB Pension on bonus compensation
                                                                                           [Non-Qual.]
4.   USS Savings Fund Plan                                       0           9/01 -       DC savings [401(k) and 401(m)]
5.   USS Supplemental Thrift Program                             0           9/01 -       Company match not provided under
                                                                                           Plan 4 [Non-Q.]

Marathon Plans
--------------
6.   MRO - Marathon Retirement Plan                         54,582        2/97 - 8/98     DB pension on regular and bonus
                                                                                           compensation
7.   MRO and MAP - Thrift Plan                         (See website)      2/97 - 8/98     DC savings [401(k) and 401(m)]
                                                                          1/00 - 8/01
8.   MRO - Excess Benefits Plan                                           2/97 - 8/98     Excess not payable under Plans 6 & 7
                                                                                           [Non-Qual.]
     .   Excess Defined Contribution (Thrift)               30,800
     .   Excess Defined Benefit                    (Shown in Plan 6)
9.   MAP - RM&T Subplan of MAP Plan                        111,345        1/00 - 8/01     DB pension on regular and bonus
                                                                                           compensation
10.  MAP - Excess Benefits Plan                                           1/00 - 8/01     Excess not payable under Plans 9 & 7
                                                                                           [Non-Qual.]
     .   Excess Defined Contribution (Thrift)               35,900
     .   Excess Defined Benefit                    (Shown in Plan 9)
11.  SSA - Retail Subplan of MAP Plan
       - Petroleum Marketing Legacy                         17,471       9/98 - 12/98     DB pension on regular and bonus
                                                                                           compensation
       - Pension Equity Provisions                          79,848       1/99 - 12/99     DB pension on regular and bonus
                                                                                           compensation
12.  SSA - Excess Benefits Plan                   (Shown in Plan 11)     9/98 - 12/99     Excess not payable under Plan 11
                                                                                           [Non-Qual.]

Deferred Compensation Arrangements
----------------------------------

13.  MAP - Deferred Compensation                           178,100        1/00 - 8/01     Deferred income; hypothetical
                                                                                           Fidelity options
14.  SSA - Deferred Compensation - 1998                     21,200       9/98 - 12/98     Deferrals; earnings tied to
                                                                                           prime rate
15.  SSA - Deferred Compensation - 1999                    131,600       1/99 - 12/99     Deferred income; hypothetical
                                                                                           Fidelity options
</TABLE>

----------
/1 For purposes of this chart, the term "Excess" means the amount not payable
under a qualified trust on account of Code sections 401(a)(17) and 415 (or other
Code sections)./

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