Document:

<PAGE>

                                                                   EXHIBIT 10(m)

Mr. John T. Mills
33 West Oak Drive
Houston, TX 77056

September 25, 2000

Dear John,

In consideration for your agreeing to continue your employment with USX
Corporation and its subsidiaries until at least December 1, 2001, and to provide
the Corporation with notice of your retirement at least 90 days prior to the
date of your retirement, the Corporation agrees to provide the benefits outlined
in Sections I. and II. below if you retire during the period December 1, 2001,
through December 1, 2003.

I. Pension Benefits

  A. Value of Enhanced Early Retirement Benefit

     The Corporation will provide a pension supplement to you upon your
     retirement from the Corporation, or upon your death prior to retirement,
     equal to the excess of (1) minus (2) below:

    (1) the sum of the pension and surviving spouse benefits which would be
        provided on your behalf under the Retirement Plan of Marathon Oil
        Company (the "Retirement Plan") and the Excess Benefit Plan of Marathon
        Oil Company, if such benefits were calculated using -

       (a) your actual age at retirement (or death) plus three years, for
           purposes of applying the Retirement Plan's early retirement factors;

       (b) your actual Retirement Plan participation at retirement (or death)
           plus three years;

       (c) the "Current Interest Rate Assumption" provided in the Retirement
           Plan, except that such rate shall not exceed the "Current Interest
           Rate Assumption" that is in effect on December 1, 2000 (i.e., 4.5%);
           and

       (d) the actuarial factors and assumptions that are in effect under the
           Retirement Plan as of December 1, 2000, using your actual age at
           retirement;

    (2) the sum of the pension and surviving spouse benefits which are actually
        payable on your behalf under the Retirement Plan and the Excess Benefit
        Plan of Marathon Oil Company as of your retirement (or death).

     For purposes of determining the amounts in (1) and (2) above, benefits will
     be based upon the amount of immediate pension payable in the form of a lump
     sum distribution under the terms of the applicable plan. Salary and bonuses
     paid by USX Corporation shall be taken into account in calculating final
     average pay under the applicable plans.
<PAGE>

  B. July 22, 1998 Agreement

     The Corporation agrees to modify the calculation of the amount payable, if
     any, under the July 22, 1998 letter agreement signed by Mr. T. J. Usher and
     Mr. John T. Mills regarding the recognition of USX Corporation service as
     participation service under the Marathon plans (the "July 1998 Agreement"),
     so that the Retirement Plan and Excess Benefit Plan benefits referenced in
     paragraphs (1) and (2) of such agreement are calculated using the Enhanced
     Early Retirement Benefit described in paragraph A.(1) above.

II.  Retiree Medical

     The Corporation will provide additional compensation to you upon your
     retirement from the Corporation, or upon your death prior to retirement,
     equal to the excess, if any, of (A) your member contributions for you and
     your covered dependents under the Health Plan of Marathon Oil Company (the
     "Health Plan"), over (B) such member contributions that you would have paid
     under the age and service point system provided for in the Health Plan if
     your age and service was calculated using: (1) your actual age at
     retirement (or death) plus three years, and (2) your actual years of
     service at retirement (or death) plus three years.

     The additional compensation payable under this Section II will be paid in a
     single sum upon retirement and will be equal to the actuarial value of such
     excess amount each month during your and your spouse's life expectancies,
     using the actuarial factors and assumptions that are in effect under the
     Retirement Plan as of December 1, 2000.

To the extent a pension supplement and/or additional compensation is payable
under this agreement, it will be paid by USX Corporation or Marathon Oil
Company, whichever is your employer at the time of retirement. Except as
specifically modified by this agreement, the terms and provisions of the July
1998 Agreement remain in force.

Sincerely,

/s/  T. J. Usher

T. J. Usher

           Agreed to:    /s/  John T. Mills           September 25, 2000
                       -------------------------
                              John T. Mills

                                       2<PAGE>

                                                                   EXHIBIT 10(u)

                               January 27, 1997

Mr. John P. Surma
1356 High Oak Court
Pittsburgh, PA 15241

Dear Mr. Surma:

          This letter formally confirms, on behalf of the Marathon Group of USX
Corporation ("Marathon"), an offer of employment for the position of Senior Vice
President-Finance and Accounting, Marathon, which I am authorized by the USX
Board of Directors to extend to you. Significant aspects of Marathon's offer
include the following:

          1.  You will be paid, in equal monthly installments, an annual salary
of $250,000. In addition, you will be eligible to receive an annual performance
bonus, based upon your and Marathon's actual performance in each calendar year,
having a target award in any one year equal to 60% of your annual salary.

          2.  Should you accept this offer of employment, I will recommend to
the USX Compensation Committee that it approve, at its May, 1997 meeting, the
issuance to you, at the then current market price, of 50,000 stock option shares
of USX-Marathon Group stock, as well as 2,000 shares of USX-Marathon Group
restricted stock. Your entitlement to have the restricted stock issued to you
vest will be determined in accordance with the provisions of the USX 1990 Stock
Plan.

          3.  Marathon will pay on your behalf all dues and service charges
which you incur as a consequence of your continuing memberships in the Duquesne
Club and the St. Clair Country Club. In addition, upon your relocation to
Houston, Texas, Marathon will pay any initiation fees, and thereafter all annual
dues and service charges which you incur, in a Houston country club to be
determined by mutual agreement between us.

          4.  Immediately upon your commencement of actual employment with
Marathon, you will be credited with 15 years of continuous service for all
purposes in all Marathon pension plans applicable to executive officers.
Thereafter, you will accrue future service and benefits under Marathon pension
plans in accordance with the terms of the pension plan documents.
<PAGE>

Mr. John P. Surma
January 27, 1997
Page 2

          5.  Should you accept this offer, your relocation from the Pittsburgh
area to the Houston area will be covered by and receive the benefits of
Marathon's management relocation policy, including the house purchase provisions
thereof.

          6.  As a Marathon executive employee, you will be eligible to
participate in all of Marathon's existing and future employee benefit programs
applicable to executive officers. In addition, you will: (1) receive one
comprehensive physical examination at Company expense in each calendar year in
accordance with Marathon's policy covering physical examinations of Marathon
executive officers; and (2) tax preparation and financial planning advice under
terms and conditions comparable to those applicable to USX executive management.

          7.  Upon your employment by Marathon, the USX Board of Directors will
extend to you a change in control agreement which, upon your acceptance thereof,
will provide you with earnings protection up to a maximum of three times your
annual salary and bonus should a change in control of USX, as defined in such
agreement, occur.

          Both Marathon and I believe that because of your extensive financial
background and personal qualities, you are an individual who can make a unique
and valuable contribution to Marathon's future success. I therefore hope, both
personally and for Marathon, that you will accept our offer of employment.

                                Sincerely,

                                /s/  Dan D. Sandman

                                Dan D. Sandman

P.S.  We have also agreed
      to 5 weeks paid vacation.

Accepted/  /s/  John P. Surma
               1/27/97<PAGE>

                                                                   EXHIBIT 10(v)

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
<PAGE>

       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.

   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.

                                       2
<PAGE>

       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.

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

                                       3
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<TABLE>
<CAPTION>

                                                                                                                           EXHIBIT A

                                        JOHN P. SURMA LETTER AGREEMENT - DECEMBER 21, 2001
                          APPLICATION OF BONUS SERVICE TO STEEL AND MARATHON PLANS (AND THEIR SUCCESSORS)

                                                                           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        No impact
                                                             (provides higher Co. match)

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

      -  Pension Equity Provisions                           15 years of bonus service        No impact on number of accrual years
                                                             (provides higher accrual rate)

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

<TABLE>
<CAPTION>

                                                                                                                           EXHIBIT B

                                     JOHN P. SURMA - APPLICABLE PENSION AND SAVINGS PLANS AND
                                     DEFERRED COMPENSATION ARRANGEMENTS (AND THEIR SUCCESSORS)

                                                                                 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
------------------------
/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).
</TABLE>

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