Document:

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                                                                    Exhibit 10.2

                         TRANSITION SERVICES AGREEMENT

     THIS TRANSITION SERVICES AGREEMENT ("Agreement"), dated as of ________,
                                          ---------
2001, by and between USX Corporation, a Delaware corporation, to be renamed
"Marathon Oil Corporation" ("USX"), and United States Steel LLC, a Delaware
                             ---
limited liability company and wholly owned subsidiary of USX, to be renamed
"United States Steel Corporation" ("SteelCo").
                                    -------

                              W I T N E S S E T H:

     WHEREAS, this Agreement is made pursuant to and as a condition of the
Agreement and Plan of Reorganization, dated as of July 31, 2001 ("Separation
                                                                  ----------
Agreement"), by and between USX and SteelCo, pursuant to which the respective
---------
businesses of the Marathon Group of USX and the U.S. Steel Group of USX are
being separated into two independent companies by merging USX Merger
Corporation, a Delaware corporation and a wholly owned subsidiary of USX
("Merger Sub"), with and into USX, subject to the terms and conditions thereof,
  ----------
and pursuant to Section 251 of the DGCL (the "Separation Merger"), with USX
                                              -----------------
continuing as the surviving corporation, so that immediately following the
Separation Effective Time, SteelCo shall own and operate the business of the
U.S. Steel Group and shall be wholly owned by the holders of the then
outstanding shares of USX-U.S. Steel Group Common Stock, and the business of the
Marathon Group shall be owned and operated by USX, which shall be a separate and
independent entity from SteelCo and shall be wholly owned by the holders of the
then outstanding shares of USX-Marathon Group Common Stock (the "Separation");
                                                                 ----------

     WHEREAS, prior to the Separation, USX personnel at the Pittsburgh,
Pennsylvania corporate headquarters of USX have provided accounting, audit,
corporate finance, government affairs, investor relations, legal, stock
transfer, strategic planning, public affairs and tax services, and Marathon Oil
Company provided leasing services to USX (the "Corporate Services") that
                                               ------------------
primarily relate to corporate-wide matters and for which the costs are allocated
between the Marathon Group and the U.S. Steel Group;

     WHEREAS, effective upon the Separation Effective Time, each of USX and
SteelCo will be responsible for its own needs in the area of Corporate Services,
and USX corporate personnel may be assigned to, and may be employed by, either
USX or SteelCo or their respective subsidiaries;

     WHEREAS, in the event that USX or SteelCo is unable to initially service
its own needs with respect to any Corporate Services, the other company will
provide such Corporate Services to the other in accordance with the terms
hereof, if able to do so;

     WHEREAS, USX's Pittsburgh headquarters has relied on employees of the U.S.
Steel Group and the Marathon Group for many of its computer applications and
information technology support (the "Computer Services"), and USX and SteelCo
                                     -----------------
shall
<PAGE>

continue providing Computer Services to USX headquarters or the other
party hereto on the terms and subject to the conditions contained herein; and

     WHEREAS, the parties further desire to address the status of certain
Transition Employees that will provide temporary services to USX after the
Separation Effective Date.

     NOW, THEREFORE, in furtherance of the foregoing and in consideration of the
mutual promises and undertakings contained herein and in any other document
executed in connection with this Agreement, the parties agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

          Section 1.1 General. Unless otherwise defined herein, capitalized
                      -------
terms used herein shall have their respective meanings as defined in the
Separation Agreement. For purposes hereof, "USX Corporate Employees" shall mean
all persons employed by USX at or near the Separation Effective Time who are
designated in the payroll records of USX as employees of USX headquarters.

          Section 1.2  Other Definitional Provisions.
                       -----------------------------

               (a) The words "hereof", "herein", "hereunder" and words of
similar import, when used in this Agreement, shall refer to this Agreement as a
whole and not to any particular provision of this Agreement.

               (b) The terms defined in the singular shall have a comparable
meaning when used in the plural, and vice versa.

               (c) The terms "dollars" and "$" shall mean United States dollars.

                                   ARTICLE II

                            SERVICES TO BE PROVIDED

          Section 2.1 Corporate Services and Costs. In the event USX or SteelCo
                      ----------------------------
or their respective subsidiaries is unable to service its needs in any of the
Corporate Services, such party may request that the other party provide such
Corporate Services as are specified in a written request, on the terms and
subject to the conditions contained herein. The party to whom the request for
Corporate Services has been made shall provide such Corporate Services on the
conditions that (i) it determines (in its sole discretion) that it is able to
perform such Corporate Services, (and it shall notify the requesting party
within ten business days of the date of the written request as to whether or not
it is able to perform such Corporate Services) and (ii) the party receiving such

                                       2
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Corporate Services agrees to reimburse the supplying party for all Costs
incurred in providing such Corporate Services. For purposes herein, "Costs"
shall mean all direct, fixed and variable, costs without allocation of overhead.
The party supplying Corporate Services shall provide such Corporate Services on
terms which are similar in nature, volume and scope to those Corporate Services
which were provided to the requesting party immediately prior to the Separation
Effective Time, unless otherwise mutually agreed upon by the parties hereto.

          Section 2.2  Computer Services and Costs.  To the extent that USX or
                       ---------------------------
SteelCo or their respective subsidiaries provides Computer Services to USX
headquarters or the other party hereto immediately prior to the Separation, upon
the written request of the recipient party to receive such Computer Services on
the terms and subject to the conditions contained herein, such party supplying
the Computer Services shall continue to provide the Computer Services to the
receiving party on the same basis that such services were performed immediately
prior to the Separation.  The party to whom the request for Computer Services
has been made shall provide such Computer Services on the conditions that (i) it
determines (in its sole discretion) that it is able to perform such Computer
Services (and it shall notify the requesting party within ten business days of
the date of the written request whether or not it is able to perform such
Computer Services), and (ii) the party receiving such Computer Services agrees
to reimburse the supplying party for all Costs incurred in providing such
Computer Services.

          Section 2.3  Third-Party Services and Costs.  In the event any of the
                       ------------------------------
Corporate Services or Computer Services have heretofore been provided by a third
party, the sole obligation of USX or SteelCo, as the case may be in supplying
such Corporate Services or Computer Services under this Agreement, shall be to
continue to provide the other party access to the services, as delivered to it
by the third party, to the extent practicable.  In addition, each of USX and
SteelCo reserves the right to enter into new subcontract relationships in
connection with any Corporate Service or Computer Service provided hereunder.
USX or SteelCo, as the case may be, shall not otherwise be liable to the other
party in any way with respect to services provided by a third party.  Any party
receiving such third party services shall reimburse the other party or pay the
third party directly for the cost of such services.

                                  ARTICLE III

                                EMPLOYEE MATTERS

          Section 3.1 Assignment of USX Corporate Personnel. Effective on or
                      -------------------------------------
before the Separation Effective Time and in accordance with Section 8.2 of the
Separation Agreement, USX Corporate Employees may be assigned to, and may be
employed by, either USX or SteelCo or their respective subsidiaries on the basis
of whether after the Separation Effective Time they will perform services for
USX or its subsidiaries or SteelCo or its subsidiaries. USX Corporate Employees
expected to perform services for USX or its subsidiaries will be assigned to and
employed by USX or

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its subsidiaries; USX Corporate Employees expected to perform services for
SteelCo or its subsidiaries will be assigned to and employed by SteelCo or its
subsidiaries.

          Section 3.2 Exception for Transition Employees. In the event that a
                      ----------------------------------
USX Corporate Employee is not expected to continue to perform services for a
period in excess of one (1) calendar year after the Separation Effective Time
for either SteelCo or USX or their respective subsidiaries ("Transition
Employee"), such Transition Employee will be assigned to and employed by SteelCo
for any period of time such Transition Employee performs services for either
SteelCo or USX or their respective subsidiaries after the Separation Effective
Time. USX Corporate Employees subject to this exception shall be identified on a
schedule and agreed to by the parties prior to the Separation Effective Time.
Services provided by a Transition Employee shall be subject to the terms and
conditions set forth in this Agreement.

                                   ARTICLE IV

                                    RELEASE

          Section 4.l  USX's Agreement to Release.  USX unconditionally releases
                       --------------------------
SteelCo and its directors, officers, employees, Representatives, advisors,
agents and Affiliates (collectively, the "U.S. Steel Released Parties") from,
                                          ---------------------------
against and in respect of any and all Actions arising out of, relating to or
resulting from, directly or indirectly, the adequacy, timeliness or other
quality of the Corporate Services, Computer Services, or services from a
Transition Employee provided by or through SteelCo (other than as a direct
result of the gross negligence or willful misconduct of SteelCo).

          Section 4.2  SteelCo's Agreement to Release.  SteelCo unconditionally
                       ------------------------------
releases USX and its directors, officers, employees, Representatives, advisors,
agents and Affiliates (collectively, the "USX Released Parties") from, against
                                          --------------------
and in respect of any and all Actions arising out of, relating to or resulting
from, directly or indirectly, the adequacy, timeliness or other quality of the
Corporate Services or Computer Services provided by or through USX (other than
as a direct result of the gross negligence or willful misconduct of USX).

                                   ARTICLE V

                                    LICENSE

          Section 5.1 Grant of License to SteelCo. USX grants to SteelCo and its
                      ---------------------------
subsidiaries a fully paid, worldwide, nonexclusive license for their internal
use only and not as a service bureau, without the right to sublicense or assign,
in all computer programs, software, source code, and know-how (whether patented,
trademarked, copyrighted or not) owned or licensed (to the extent permitted by
the terms of such license) by USX or its subsidiaries and utilized in providing
Corporate Services and Computer Services to SteelCo under the terms of this
Agreement or to the U.S. Steel Group immediately prior to the date hereof.

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<PAGE>

          Section 5.2  Grant of License to USX.  SteelCo grants to USX and its
                       -----------------------
subsidiaries a fully paid, worldwide, nonexclusive license for their internal
use only and not as a service bureau, without the right to sublicense or assign,
in all computer programs, software, source code, and know-how (whether patented,
trademarked, copyrighted or not) owned or licensed (to the extent permitted by
the terms of such license) by SteelCo or its subsidiaries and utilized in
providing Corporate Services and Computer Services to USX under the terms of
this Agreement or the Marathon Group immediately prior to the date hereof.

          Section 5.3 Disclaimer. With respect to the grant of licenses in this
                      ----------
Article V, no party makes any representation or warranty whatsoever including,
without limitation, suitability, ownership, usefulness, non-infringement or
existence.

                                   ARTICLE VI

                               TERM AND AMENDMENT

          Section 6.1 Term. The term of this Agreement shall commence on the
                      ----
date set forth above and shall remain in force until the first anniversary of
the date hereof, unless earlier terminated by the mutual agreement of the
parties. Either party shall have the right to terminate this Agreement in the
event of a material breach by the other party upon thirty (30) days' prior
written notice, but only if such breach is not cured prior to expiration of such
thirty (30) day period. In addition, the party requesting any Corporate
Services, Computer Services, or the services of a Transition Employee hereunder
shall have the right to terminate this Agreement with respect to any such
Corporate Service, Computer Service, or service from a Transition Employee by
providing the supplying party with thirty (30) days prior written notice of
termination.

          Section 6.2  Amendment.  This Agreement may be amended, modified or
                       ---------
supplemented at any time and shall be evidenced by a written agreement signed by
all of the parties hereto.

                                  ARTICLE VII

                              BILLING AND PAYMENT

          Section 7.1 Timing and Payments. On or before the 20th day of each
                      -------------------
month, the party supplying any Corporate Services, Computer Services, or
services from a Transition Employee hereunder (collectively, the "Services")
shall invoice the receiving party for all costs incurred in providing Services
including third party invoices received, in the preceding calendar month. Within
thirty (30) days of the date of each invoice relating to Services provided
hereunder, the receiving party shall pay the supplying party the amount due by
check or wire transfer. All amounts not paid within such thirty (30) days shall
bear interest at the rate of twelve percent (12%) per annum (the "Interest
Rate"). Interest shall be due on any amount which the receiving party is
otherwise

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disputing if such charge is ultimately determined to be applicable, but no
interest shall apply as to any disputed amounts ultimately determined in the
receiving party's favor.

          Section 7.2 Additional Information. If either party believes that
                      ----------------------
there has been an error in an amount invoiced or paid or the timing of any
payment hereunder, then such party shall notify the other party of such alleged
error and shall provide written evidence of the error as is available at the
time of such notice. Each party shall provide the other with sufficient records
relating to the matter so as to permit the parties to attempt to resolve the
inconsistency. Following the determination of whether an error occurred, any
improper charge or invoice, overpayment or underpayment found shall be remedied,
with interest at the Interest Rate in case of an overpayment or underpayment by
the party that benefited from such error. Notwithstanding the foregoing, neither
party may question the accuracy, correctness, timing or amount of any payment
under this Agreement unless it notifies the other party of its disagreement
within the ninety (90) days immediately following the date such payment was due.
Upon request of the receiving party, the supplying party shall provide
commercially reasonable support for all charges and expenses invoiced.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

          Section 8.1 Dispute Resolution. Any dispute between the parties shall
                      ------------------
be subject to the Dispute Resolution procedure set forth in Section 15.2 of the
Separation Agreement.

          Section 8.2 Expenses. Unless otherwise provided herein, all out-of-
                      --------
pocket costs and expenses with respect to the transactions contemplated in this
Agreement shall be borne by the party incurring such costs and expenses.

          Section 8.3 Records. Each party shall have access to Information in
                      -------
the possession of the other party relating to activities prior to the Separation
and such Information shall be subject to the confidentiality provisions of
Section 11.4 of the Separation Agreement. Upon the request of the party seeking
such access, the other party shall make any such Information available or make
copies for the requesting party without charge.

          Section 8.4 Governing Law. This Agreement shall be governed by, and
                      -------------
construed in accordance with, the laws of Delaware, without reference to choice
of law principles, including matters of construction, validity and performance.

          Section 8.5 Notices. Notices, requests, permissions, waivers,
                      -------
referrals and all other communications hereunder shall be in writing and shall
be deemed to have been duly given if signed by the respective persons giving
them (in the case of any corporation or limited liability company, the signature
shall be by an officer thereof) and delivered by hand or by telecopy or on the
date of receipt indicated on the return receipt

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<PAGE>

if mailed (registered or certified, return receipt requested, properly addressed
and postage prepaid).

                    If to SteelCo, to:

                         United States Steel LLC
                         600 Grant Street
                         Suite 6100
                         Pittsburgh, PA 15219-4776
                         Attention: General Counsel
                         Facsimile: 412-433-1131

                    If to USX, to:

                         Marathon Oil Corporation
                         5555 San Felipe Road
                         Houston, TX  77056-2723
                         Attention: General Counsel
                         Facsimile: 713-296-4375

Such names and addresses may be changed by notice given in accordance with this
Section 8.5.  Copies of all notices, requests, permissions, waivers, referrals
and all other communications hereunder given prior to the Separation Effective
Time shall be given to:

                         Skadden, Arps, Slate, Meagher & Flom LLP
                         4 Times Square
                         New York, NY 10036-6522
                         Attention: Roger S. Aaron, Esquire
                         Facsimile: (212) 735-2000

          Section 8.6  Third-Party Beneficiaries.  Nothing in this Agreement
                       -------------------------
shall confer any rights upon any Person or entity other than the parties hereto
and their respective heirs, successors and permitted assigns.

          Section 8.7  Entire Agreement. This Agreement contains the entire
                       ----------------
understanding of the parties hereto with respect to the subject matter contained
herein, and supersedes and cancels all prior agreements, negotiations,
correspondence, undertakings and communications of the parties, oral or written,
respecting such subject matter.

          Section 8.8  Headings. The article, section and paragraph headings
                       --------
contained in this Agreement are for reference purposes only and shall not affect
in any way the meaning or interpretation of this Agreement.  All references
herein to "Articles" or "Sections" shall be deemed to be references to Articles
or Sections hereof unless otherwise indicated.

                                       7
<PAGE>

          Section 8.9   Counterparts.  This Agreement may be executed in one or
                        ------------
more counterparts and each counterpart shall be deemed to be an original, but
all of which shall constitute one and the same original.

          Section 8.10  Parties in Interest; Assignment; Successors.  Neither
                        -------------------------------------------
this Agreement nor any of the rights, interests or obligations hereunder shall
be assigned by any of the parties hereto without the prior written consent of
the other party.  Subject to the preceding sentence, this Agreement shall inure
to the benefit of and be binding upon SteelCo and USX and their respective
successors and permitted assigns.  Nothing in this Agreement, express or
implied, is intended to confer upon any other Person any rights or remedies
under or by reason of this Agreement.

          Section 8.11  Severability; Enforcement. The invalidity of any portion
                        -------------------------
hereof shall not affect the validity, force or effect of the remaining portions
hereof.  If it is ever held that any restriction hereunder is too broad to
permit enforcement of such restriction to its fullest extent, each party agrees
that a court of competent jurisdiction may enforce such restriction to the
maximum extent permitted by law, and each party hereby consents and agrees that
such scope may be judicially modified accordingly in any proceeding brought to
enforce such restriction.

          Section 8.12  Remedies. The parties agree that money damages or other
                        --------
remedy at law would not be a sufficient or adequate remedy for any breach or
violation of, or a default under, this Agreement by them and that in addition to
all other remedies available to them, each of them shall be entitled to the
fullest extent permitted by law to an injunction restraining such breach,
violation or default or threatened breach, violation or default and to any other
equitable relief, including specific performance, without bond or other security
being required.

     IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
duly executed on its behalf by its officers thereunto duly authorized, all as of
the day and year first above written.

                                    USX CORPORATION

                                    By: __________________________

                                    Name: _______________________

                                    Title: ________________________

                                    UNITED STATES STEEL LLC

                                    By: __________________________

                                    Name: _______________________

                                    Title: ________________________

                                       8<PAGE>

                                                                    Exhibit 10.3

                                    Form Of

                          Financial Matters Agreement

     This Financial Matters Agreement is entered into as of this [  ] day of [
], 2001 by and between USX Corporation, a Delaware corporation ("Parent") and
United States Steel LLC, a Delaware limited liability company ("Steel").

                                  WITNESSETH

     WHEREAS, Steel is a wholly owned subsidiary of Parent; and

     WHEREAS, Parent, Steel and another corporation named USX Corporation ("Old
USX") were parties to a Holding Company Reorganization Agreement dated as of
July 1, 2001 (the "Reorganization Agreement"); and

     WHEREAS, the Reorganization Agreement was entered into to better align the
assets and liabilities of Old USX with its two classes of common stock, namely
USX--Marathon Group Common Stock and USX--U.S. Steel Group Common Stock; and

     WHEREAS, in connection with the Reorganization Agreement, Parent assumed
certain obligations of Old USX and Steel became liable for all other obligations
of Old USX as was required by the terms of such obligations; and

     WHEREAS, to induce General Electric Credit Corporation of Delaware ("GECC")
and Southern Energy Clairton, L.L.C ("SECL") to enter into Amendment Number 1 to
the Amended and Restated Limited Partnership Agreement entered into and
effective as of June 1, 1997 by and among Steel, GECC and SECL, Parent delivered
to GECC and SECL, a guarantee dated July 2, 2001 of Steel's obligations under
the aforesaid Partnership Agreement and certain related instruments and
agreements (the "1314B Guarantee"); and

     WHEREAS, to induce certain counterparties not to declare a "credit event
upon merger" under certain ISDA swap agreements, Parent executed and delivered
to various counterparties guarantees of the obligations of Steel under the
aforesaid ISDA swap agreements (the "Swap Guarantees"); and

     WHEREAS, Parent and Steel are also parties to an Agreement and Plan of
Reorganization dated  as of July 31, 2001 (the "Separation Agreement"), pursuant
to which, and subject to the terms and conditions set forth therein, all of the
shares of USX--U.S. Steel Group common stock will be converted into shares of
common stock of United States Steel Corporation; and

     WHEREAS, Parent and Steel have identified certain obligations of Parent
that are closely related to the business of Steel; and

     WHEREAS, In light of these relationships and in furtherment of the purpose
of the Reorganization Agreement and the Separation Agreement Parent and Steel
have
<PAGE>

agreed that Parent will assign these obligations to Steel and that Steel will
assume and discharge these obligations; and

     WHEREAS, Parent and Steel wish to establish how certain other debt
obligations and financial matters shall be arranged.

     NOW, THEREFORE, in consideration of the premises, the mutual covenants
contained herein and intending to be legally bound hereby, the parties hereto
agree as follows:

                                   Article I
                           Industrial Revenue Bonds

     1.1  Assumption of Industrial Revenue Bond Obligations.  Parent is the
          --------------------------------------------------
obligor on $479,490,000 of obligations pursuant to agreements with respect to an
equal principal amount of tax exempt environmental revenue bonds issued by
various governmental issuers all of which are more particularly described on
Schedule 1.1 attached hereto (collectively, the "Industrial Revenue Bonds").

     (a)  For a term beginning on the date hereof and ending on the earlier of
          the tenth anniversary of the Separation Effective Time (as defined in
          the Separation Agreement) or December 31, 2040, Parent hereby assigns
          to Steel and Steel assumes all of Parent's rights and obligations with
          respect to the Industrial Revenue Bonds including, without limitation,
          the obligation to pay debt service on the Industrial Revenue Bonds.
          The term "debt service" is meant to include all sums due with respect
          to the Industrial Revenue Bonds including, without limitation,
          payments of principal, interest and premium, letter of credit fees and
          expenses (incurred by either Parent or Steel or both), trustee fees
          and expenses, issuer fees and expenses and remarketing fees and
          expenses.

     (b)  During the term of this Agreement, Steel shall provide all notices and
          take such other actions as may be necessary or appropriate in
          connection with ongoing obligations related to the Industrial Revenue
          Bonds.

     Steel's obligations with respect to the Industrial Revenue Bonds shall
include payment of amounts due upon any defaults or acceleration of any of the
obligations with respect to the Industrial Revenue Bonds other than defaults
caused by Parent.

     1.2  Rights of Steel.  During the term of this Agreement, Steel shall have
          ---------------
the right to exercise all of the existing contractual rights of Parent
concerning the Industrial Revenue Bonds including all rights to the selection of
interest rates, making prepayments or granting or releasing security interests
and Parent shall use commercially reasonable efforts to assist Steel in its
exercise of such rights.  Notwithstanding the foregoing, Steel shall have no
right to increase the principal amount or to change the maturity of any of the
Industrial Revenue Bonds without the prior written consent of Parent except as
set forth in Section 1.4(b).

     1.3  Variable Rate Industrial Revenue Bonds.  The Industrial Revenue Bonds
          --------------------------------------
that are designated on Schedule 1.1 as variable rate environmental revenue bonds
are referred to as the "Variable Rate Bonds."  During the term of this Agreement
Steel may

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<PAGE>

from time to time direct conversion of the Variable Rate Bonds to different
interest rate periods, and Parent shall undertake all reasonable efforts to
effectuate each such conversion. Parent will not, without the prior written
consent of Steel, convert any of the Variable Rate Bonds to a different interest
rate. Notwithstanding anything in this Agreement to the contrary, Steel's
ability to direct conversion of the Variable Rate Bonds to a different interest
rate period and maintain a given interest rate period shall be subject to
Parent's ability to maintain appropriate letters of credit respecting the
Variable Rate Bonds. Parent shall undertake commercially reasonable efforts to
obtain and maintain letters of credit and/or such other liquidity facilities
(each, a "Liquidity Facility") as may be permitted by the applicable Bond
Documents (hereinafter defined). If Parent's ability to obtain and maintain
Liquidity Facilities is reduced so that Parent's business is adversely affected
in a material way, Parent may, following timely written notice to Steel, decline
to renew one or more Liquidity Facilities with respect to one or more issues of
Variable Rate Bonds. Concurrently with said notice Parent shall supply an
opinion of an independent third party regarding the availability of Liquidity
Facilities to Parent. Steel may at any time provide substitute Liquidity
Facilities applicable to one or more issues of the Variable Rate Bonds.

     1.4  Refinancing
          -----------

          (a)  If Steel notifies Parent in writing that Steel elects to redeem
     all or part of any of the Industrial Revenue Bonds and supplies adequate
     funds therefor, Parent shall reasonably assist Steel to effectuate such
     redemption(s) and Steel's obligations under this Agreement shall be reduced
     accordingly.  Parent shall not, without the prior written consent of Steel,
     direct the redemption of any Industrial Revenue Bonds prior to maturity.

          (b)  If Steel elects to refinance all or part of any of the Industrial
     Revenue Bonds through a tax-exempt refunding or otherwise, Parent shall
     take all such reasonable action as may be necessary or appropriate to
     reasonably assist Steel in completing the transactions contemplated by each
     such refinancing, so long as after the completion of such transactions,
     Parent does not have any obligations with respect to any new debt issued as
     a result.

     1.5  Release by Parent at end of Term.  On the earlier of the tenth
          --------------------------------
anniversary of the Separation Effective Time (as defined in the Separation
Agreement) or December 31, 2040 Steel shall pay to Parent an amount equal to the
principal amount and all accrued and unpaid debt service then outstanding on
each Industrial Revenue Bond.  Upon such payment, (a) Steel shall assign to
Parent and Parent shall assume all remaining obligations regarding the
Industrial Revenue Bonds including without limitation, the obligation to pay
debt service on the Industrial Revenue Bonds, and (b) Parent shall release Steel
from all liability and obligations arising under or relating to the Industrial
Revenue Bonds.

                                  Article II
                                    Leases

     2.1  Assumption of Capital and Other Leases.  Parent hereby assigns to
          ---------------------------------------
Steel and Steel assumes all rights and obligations of Parent relating to the
leases listed in Schedule 2.1 attached hereto (the "Assumed Leases") including
without limitation, the obligation to pay all sums due under the Assumed Leases.
Steel's obligations with

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<PAGE>

respect to the Assumed Leases shall include payment of amounts due upon any
defaults or acceleration of any of the obligations with respect to the Assumed
Leases other than defaults caused by Parent.

     2.2  Contingent Nature of Certain Leases.  Certain of the Assumed Leases,
          -----------------------------------
as designated in Schedule 2.1, were previously assigned to and assumed by third
parties in agreements between such third parties and Old USX (the "Previously
Assigned Leases").  Steel assumes and shall discharge all obligations of Old USX
relating to the Previously Assigned Leases.

     2.3  Rights of Steel.  Steel shall have the right to exercise all of the
          ---------------
existing contractual rights of Parent concerning the Assumed Leases including
all rights relating to purchase options, prepayments or granting or releasing
security interests, and Parent shall use commercially reasonable efforts to
assist Steel in its exercise of such rights.  Notwithstanding the foregoing
Steel shall have no right to increase the amounts due under or lengthen the term
of any of the Assumed Leases without the prior consent of Parent other than
extensions set forth in the terms of any of the Assumed Leases.

     2.4  Rights of Parent.  Steel shall notify Parent of its decision whether
          -----------------
to exercise any purchase option under the Assumed Leases and if Steel elects not
to so exercise Parent shall have the right but not the obligation to do so.
Parent agrees to use commercially reasonable efforts to comply with all
provisions of the Assumed Leases and shall not take any action that would result
in a default thereunder.

     2.5  Assignment of Leases.  Steel shall have the right to assign any of its
          --------------------
rights and obligations under the Assumed Leases to any party provided that such
assignment shall not release Steel from any of its obligations to Parent
relative to such Assumed Leases.

                                  Article III
                           Obligations of Each Party

     3.1  Obligations of Parent.  In connection with the Reorganization
          ----------------------
Agreement Parent assumed certain obligations of Old USX as listed in Schedule
3.1 hereof (the "Parent Obligations").  Parent acknowledges that it is solely
responsible for all obligations including debt service under the Parent
Obligations.

     3.2  Contingent Obligations of Steel.  Steel remains contingently liable
          -------------------------------
for certain of the Parent Obligations as set forth on Schedule 3.1.  Parent
agrees that it will use commercially reasonable efforts to cause Steel to be
released from such contingent liability and shall not increase the amounts due
under such obligations (other than amounts due under revolving credit facilities
that do not exceed the amounts outstanding plus the existing commitments) or
extend the terms thereof without the prior written consent of Steel other than
extensions set forth in the terms of any of the Parent Obligations.

     3.3  Contingent Obligations of Parent.  Parent remains contingently liable
          --------------------------------
under the 1314B Guarantee and the ISDA Guarantees.  Steel agrees that it will
use commercially reasonable efforts to cause Parent to be released from the
1314B Guarantee and each ISDA Guarantee and shall not increase the amounts of
the obligations guaranteed under the ISDA Guarantees without the prior written
consent of

                                     Page 4
<PAGE>

Parent. Steel further agrees to use commercially reasonable efforts to avoid
causing the amount for which Parent may be liable under the 1314B Guarantee to
be increased without the Parent's prior written consent (such consent not to be
unreasonably withheld).

                                  Article IV
                              Mutual Obligations

     4.1  Maintenance of Current Conditions.
          ---------------------------------

          (a)  Each of Steel and Parent agrees to employ all commercially
     reasonable efforts to take all necessary action or refrain from acting so
     as to assure compliance, and to cooperate with the other party in its
     endeavors to comply, with all obligations under the various documents that
     were executed and delivered in connection with the Assumed Leases and the
     Parent Obligations including, without limitation, covenants respecting the
     financed facilities, in each case, necessary to avoid the occurrence of a
     default, acceleration, casualty loss or other termination under any of the
     Assumed Leases and the Parent Obligations.

          (b)  Each of Steel and Parent agrees to employ all commercially
     reasonable efforts to take all necessary action or refrain from acting so
     as to assure compliance, and to cooperate with the other party in its
     endeavors to comply, with Parent's obligations under the various documents
     that were executed and delivered in connection with the issuance of the
     Industrial Revenue Bonds (collectively, the "Bond Documents") including,
     without limitation, covenants respecting the financed facilities, in each
     case, necessary to avoid the occurrence of an Event of Default under the
     Bond Documents or cause the interest on the Industrial Revenue Bonds to be
     included in the gross income of the holders thereof except holders who are
     "substantial users" or "related persons" as defined in Section 147(a) of
     the Internal Revenue Code of 1986, as amended or its predecessor.

          4.2  Relationship of Parties.
               ------------------------

          (a)  This Agreement is a general unsecured obligation of each of
     Parent and Steel (i.e., it  ranks equal to accounts payable and other
     general unsecured obligations of each party).  This Agreement does not
     contain any financial covenants and Parent and Steel remain free to incur
     additional debt, grant mortgages or security interests in its property and
     sell or transfer assets without the consent of the other.  Parent
     acknowledges that Steel has granted or anticipates granting security
     interests in its accounts receivable and inventory.

          (b)  This Agreement is a contract between the parties. It does not
     grant any rights to the holders of the Industrial Revenue Bonds or the
     other parties to the Assumed Leases or the Parent Obligations or the
     beneficiaries of the 1314B Guarantee and the Swap Guarantees.  Among other
     things the parties may agree to amend or modify this Agreement as they
     mutually agree and nothing herein creates or is intended to create any
     obligation to redeem or repurchase any of these instruments.

                                     Page 5
<PAGE>

     4.3  Events of Default.
          ------------------

     (a)  The following shall be "Events of Default" under this Agreement:

          (i)   (A) Steel shall fail to make any payment under any Bond Document
                or Assumed Lease when due and such failure causes a default
                under the applicable Bond Document or Assumed Lease;

                (B) Parent shall fail to make any payment under any Parent
                Obligation when due and such failure causes a default under the
                applicable Parent Obligation;

          (ii)  Either party shall fail to comply with any other covenant
     contained in this Agreement (including, without limitation, covenants to
     comply with covenants under the Bond Documents, the Assumed Leases and the
     Parent Obligations) and such failure shall continue for more than thirty
     (30) days after such party becomes aware of it, provided that under the
     Bond Documents, Assumed Leases and Parent Obligations such period shall be
     extended to the extent (but only to the extent) it does not precipitate an
     event of default under the applicable Bond Documents, Assumed Leases or
     Parent Obligations;

          (iii) Either party shall make a general assignment for the benefit of
     creditors, or files or has filed a petition in bankruptcy, or a petition or
     answer seeking a readjustment of its indebtedness under the United States
     Bankruptcy Code or any similar law or code, or consents to the appointment
     of a receiver or trustee of it or for a substantial part of its properties;
     or

          (iv)  Either party shall be adjudged bankrupt or insolvent, or a
     petition or proceedings for bankruptcy shall be filed against it, and such
     party shall admit the material allegations thereof, or an order, judgment,
     or decree shall be made approving such a petition, and such order, judgment
     or decree shall not be vacated or stayed within sixty (60) days of its
     entry, or a custodian, receiver or trustee shall be appointed for either
     party  or a substantial part of its properties and remain in possession
     thereof for sixty (60) days.

          (b)   Upon the occurrence of an Event of Default pursuant to
     subparagraphs (iii) or (iv) of Section 4.3(a), all sums then or thereafter
     due hereunder (including, without limitation, the amounts that may become
     due under Section 1.4 hereof) shall become immediately due and payable.
     Upon the occurrence of any one or more of the other Events of Default, all
     sums then or hereafter due hereunder shall, at the non-defaulting party's
     option, immediately become due and payable.  Overdue amounts shall bear
     interest at a rate of interest equal to that announced from time to time by
     J. P. Morgan Chase & Co. (or its successor) as its "prime rate" plus two
     percent per annum.

     4.4  Indemnification.
          ----------------

          (a)   Steel agrees to indemnify and hold harmless Parent as well as
     all shareholders, directors, officers, employees, subsidiaries and agents
     of Parent (collectively, "Indemnified Persons") against any and all direct
     or indirect liability (whether absolute, accrued or unaccrued, contingent,
     liquidated or unliquidated,

                                     Page 6
<PAGE>

     matured or unmatured or known or unknown), indebtedness, obligation,
     expense, claim, deficiency, guarantee or endorsement of or by any such
     Indemnified Person (including, without limitation, those arising under any
     law, regulation, ordinance, or award of any court, tribunal or arbitrator
     of any kind) together with all reasonable attorney's fees and other costs
     and expenses ("Liability") arising from, relating to or incurred in
     connection with the Industrial Revenue Bonds, the Assumed Leases, the 1314B
     Guarantee or the Swap Guarantees.

          (b)  Parent agrees to indemnify and hold harmless Steel as well as all
     Indemnified Persons of Steel against any and all Liability arising from,
     relating to or incurred in connection with the Parent Obligations.

                                   Article V
                              General Provisions

     5.1  Governing Law.  This Agreement shall be governed by, and construed in
          -------------
accordance with, the laws of Delaware, without reference to choice of law
principles, including matters of construction, validity and performance.

     5.2  Notices.  All notices shall be sent in accordance with the
          -------
Reorganization Agreement.

     5.3  Third Party Beneficiaries.  Nothing in this Agreement shall confer any
          -------------------------
rights upon any Person or entity other than the parties hereto and their
respective heirs, successors and permitted assigns.  Without limiting the
foregoing the inclusion of any matter within the defined terms Industrial
Revenue Bonds, Assumed Leases or Parent Obligations is merely for purposes of
allocating responsibility for such matter as between the parties hereto and such
inclusion does not and is not intended to acknowledge legal enforceability or
waive any defenses.

     5.4. Entire Agreement.  This Agreement, contains the entire understanding
          -----------------
of the parties hereto and thereto with respect to the subject matter contained
herein and therein, and supersedes and cancels all prior agreements,
negotiations, correspondence, undertakings and communications of the parties,
oral or written, respecting such subject matter.

     5.5. Headings.  The article, section and paragraph headings contained in
          --------
this Agreement are for reference purposes only and shall not affect in any way
the meaning or interpretation of this Agreement.

     5.6. Counterparts.  This Agreement may be executed in one or more
          ------------
counterparts and each counterpart shall be deemed to be an original, but all of
which shall constitute one and the same original.

     5.7. Parties in Interest; Assignment; Successors.  Except as set forth
          -------------------------------------------
herein, neither this Agreement nor any of the rights, interests or obligations
hereunder shall be assigned by any of the parties hereto without the prior
written consent of the other parties. Subject to the preceding sentence, this
Agreement shall inure to the benefit of and be binding upon Steel and Parent and
their respective successors and permitted assigns.

                                     Page 7
<PAGE>

     5.8. Severability; Enforcement.  The invalidity of any portion hereof shall
          -------------------------
not affect the validity, force or effect of the remaining portions hereof.  If
it is ever held that any restriction hereunder is too broad to permit
enforcement of such restriction to its fullest extent, each party agrees that a
court of competent jurisdiction may enforce such restriction to the maximum
extent permitted by law, and each party hereby consents and agrees that such
scope may be judicially modified accordingly in any proceeding brought to
enforce such restriction.  Each party hereby consents to the exclusive
jurisdiction of the Court of Chancery of the State of Delaware or the United
States District Court for the District of Delaware to resolve any disputes under
this agreement and all parties waive any and all defenses that they may have to
challenge the jurisdiction or venue of such courts.

     In witness whereof this Agreement is entered into as of the day first
written above.

                              USX CORPORATION

                              By:_____________________________________
                                            Vice President

                              UNITED STATES STEEL LLC

                              By:_____________________________________
                                            Vice President

                                     Page 8
<PAGE>

                                 Schedule 1.1

                      Industrial Revenue Bond Obligations

1.   Loan Agreement dated as of June 1, 1994 with The Industrial Development
     Board of the City of Fairfield (Alabama) in relation to $12,695,000
     aggregate principal amount of The Industrial Development Board of the City
     of Fairfield (Alabama), Environmental Improvement Revenue Bonds (USX
     Corporation Project) Refunding Series A 1994.

2.   Loan Agreement dated as of June 1, 1994 with Allegheny County Industrial
     Development Authority in relation to $42,370,000 aggregate principal amount
     of the Allegheny County Industrial Development Authority, Environmental
     Improvement Revenue Bonds (USX Corporation Project) Refunding Series A
     1994.

3.   Loan Agreement dated as of November 1, 1995 with Utah County, Utah in
     relation to $32,375,000 aggregate principal amount of Utah County, Utah,
     Environmental Improvement Revenue Bonds (USX Corporation Project) Refunding
     Series of 1995. /V/

4.   Loan Agreement dated as of November 1, 1995 with Ohio Air Quality
     Development Authority in relation to $10,160,000 aggregate principal amount
     of Ohio Air Quality Development Authority, Environmental Improvement
     Revenue Bonds (USX Corporation Project) Refunding Series of 1995. /V/

5.   Amended and Restated Agreement of Sale dated as of November 1, 1995 with
     The Industrial Development Board of the City of Fairfield (Alabama) in
     relation to $6,175,000 aggregate principal amount of The Industrial
     Development Board of the City of Fairfield (Alabama), Environmental
     Improvement Revenue Bonds (USX Corporation Project) Refunding Series of
     1995. /V/

6.   Loan Agreement dated as of November 1, 1995 with Bucks County
     (Pennsylvania) Industrial Development Authority in relation to $8,690,000
     aggregate principal amount of Bucks County (Pennsylvania) Industrial
     Development Authority Environmental Improvement Revenue Bonds (USX
     Corporation Project) Refunding Series of 1995. /V/

7.   Loan Agreement dated as of October 1, 1996 with Allegheny County Industrial
     Development Authority in relation to $36,515,000 aggregate principal amount
     of Allegheny County Industrial Development Authority Environmental
     Improvement Revenue Bonds (USX Corporation Project) Refunding Series of
     1996.

___________________________________

/V/ Variable Rate Bonds

                                 Schedule 1.1
                                    Page 1
<PAGE>

8.   Loan Agreement dated as of December 1, 1998 with Allegheny County
     Industrial Development Authority in relation to $28,800,000 aggregate
     principal amount of Allegheny County Industrial Development Authority
     Environmental Improvement Bonds (USX Corporation Project) Refunding Series
     of 1998. /V/

9.   Loan Agreement dated as of December 1, 1998 with Allegheny County
     Industrial Development Authority in relation to $59,600,000 aggregate
     principal amount of Allegheny County Industrial Development Authority,
     Environmental Improvement Revenue Bonds (USX Corporation Project) Second
     Refunding Series of 1998.

10.  Loan Agreement dated as of December 1, 1998 with Indiana Development
     Finance Authority in relation to $55,000.000 aggregate principal amount of
     Indiana Development Finance Authority Environmental Improvement Revenue
     Bonds (USX Corporation Project) Refunding Series of 1998. /V/

11.  Loan Agreement dated as of December 1, 1998 with Indiana Development
     Finance Authority in relation to $47,000,000 aggregate principal amount of
     Indiana Development Finance Authority Environmental Improvement Revenue
     Bonds (USX Corporation Project) Refunding Series of 1998.

12.  Loan Agreement dated as of March 1, 1998 with Allegheny County Industrial
     Development Authority in relation to $33,030,000 aggregate principal amount
     of Allegheny County Industrial Development Authority Environmental
     Improvement Revenue Bonds (USX Corporation Project) Refunding Series of
     1998.

13.  Loan Agreement dated as of March 1, 1998 with Bucks County Industrial
     Development Authority in relation to $11,125,000 aggregate principal amount
     of Bucks County Industrial Development Authority Environmental Improvement
     Revenue Bonds (USX Corporation Project) Refunding Series of 1998.

14.  Bond Amortization Agreement dated as of March 1, 1998 with Gulf Coast Waste
     Disposal Authority in relation to $10,600,000 aggregate principal amount of
     Gulf Coast Waste Disposal Authority Environmental Improvement Revenue Bonds
     (USX Corporation Project) Refunding Series of 1998.

15.  Amended and Restated Agreement of Sale dated as of March 1, 1998 with The
     Industrial Development Board of the City of Fairfield (Alabama) in relation
     to $10,945,000 aggregate principal amount of The Industrial Development
     Board of the City of Fairfield (Alabama) Environmental Improvement Revenue
     Bonds (USX Corporation Project) Refunding Series of 1998.

16.  Loan Agreement dated as of May 1, 1999 with Ohio Water Development
     Authority in relation to $21,800,000 aggregate principal amount of Ohio
     Water Development Authority Environmental Improvement Revenue Bonds (USX
     Corporation Project) Refunding Series of 1999.

___________________________________

/V/ Variable Rate Bonds

                                 Schedule 1.1
                                    Page 2
<PAGE>

17.  Agreement dated December 1, 1984 between United States Steel Corporation
     and Ohio Water Development Authority in relation to $9,000,000 Ohio Water
     Development Authority Variable Rate Demand Environmental Improvement
     Revenue Bonds (United States Steel Corporation Project) Series 1984. /V/

___________________________________

/V/ Variable Rate Bonds

                                 Schedule 1.1
                                    Page 3
<PAGE>

                                 Schedule 2.1

                                Assumed Leases

1)   Participation Agreement dated as of May 11, 1982 among USX Corporation, as
     Lessee, General Electric Credit and Leasing Corporation, as Owner
     Participant, State Street Bank and Trust Company of Connecticut, as Owner
     Trustee, The CIT Group/Equipment Financing, Inc. as Loan Participant and
     The Bank of New York. as Indenture Trustee relating to Coke Battery "B" at
     Clairton Works.

2)   Charter dated as of September 1, 1980 (the "Charter") between State Street
     Bank and Trust Company of Connecticut, N.A. as Owner Trustee and USX
     Corporation of the M/V Speer.

3)   Lease Agreement dated as of December 1, 1988 between Meridian Trust
     Company, Owner Trustee, as Lessor and USX Corporation, as Lessee relating
     to the continuous slab caster at Fairfield Works.

4)   Participation Agreement dated as of October 1, 1973 among The Hydro-
     Electric Power Commission of Ontario, USX Corporation, as Lessee, Whitkath
     Inc. as Owner, the Prudential Insurance Company of America, The Travelers
     Insurance Company, Connecticut General Life Insurance Company as Loan
     Participants and First National City Bank, and the Non-Recourse Lease
     Agreements each dated as of October 1, 1973 between USX Corporation as
     Lessee and Whitkath, Inc. as Lessor.

5)   Lease Agreement dated as of November 18, 1985 (the "Lease") between USX
     Corporation, as lessee Mellon Financial Services Corporation #4 relating to
     an air separation facility at Fairfield Works.

                                 Schedule 2.1
                                    Page 1
<PAGE>

                                 Schedule 3.1

                              Parent Obligations

Parent Obligations under which Steel is not contingently liable:

1)   Securities issued under the Indenture dated as of July 1, 1991 between USX
     Corporation as issuer and Pittsburgh National Bank as trustee.

2)   Securities issued under the Indenture dated as of March 15, 1993 between
     USX Corporation as issuer and PNC Bank, National Association as trustee.

3)   Refunding Agreement dated as of December 1, 1998 with the Parish of St.
     John the Baptist in relation to $23,425,000 Parish of St. John the Baptist,
     State of Louisiana Environmental Improvement Bonds Refunding Series of 1998
     (USX Corporation Project).

4)   First Amended and Restated Loan Agreement dated August 1, 1987 with the
     Camp County Industrial Development Corporation in relation to $4,700,000
     Camp County Industrial Development Corporation Floating/Fixed Rate
     Pollution Control Revenue Bonds, Series 1983 (Texas Oil & Gas Corp.
     Project)

Parent Obligations under which Steel is contingently liable:

1)   $1,353,750,000 Five Year Credit Agreement and the $451,250,000 364-Day
     Credit Agreement both dated as of November 30, 2000 and among USX
     Corporation, the Co-Agents and other Lenders party thereto, Bank of
     America, N.A., as Syndication Agent, Citibank, N.A., The Bank of Nova
     Scotia and Commerzbank AG, as Documentation Agent, and Morgan Guaranty
     Trust Company of New York, as Administrative Agent.

2)   The following Guarantees to LOOP, LLC:

  (a)  Guarantee dated August 1, 1986 (Series 1986),

  (b)  Guarantee dated June 7, 1990 (Series E),

  (c)  Guarantee dated July 2, 1991 (Series 1991),

  (d)  Guarantee dated October 1, 1992 (Series 1992),

  (e)  Series 1997 - Guarantee dated August 29, 1997 (Series 1997), and

  (f)  Guarantee dated November 9, 1994 (Credit Agreement).

3)   Restated Guarantees each dated as of June 5, 2000 (the "Guaranty") made
                                                             --------
     by USX for the benefit of each party to the Amended and Restated
     Participation Agreements, each dated as of June 5, 2000, among, inter alia:
     (a) the Dai-Ichi Kangyo Bank, Ltd. (New York Branch), National Westminster
     Bank, PLC (New York Branch), and Bank of America Leasing and Capital, LLC,
     as Owner

                                 Schedule 3.1
                                    Page 1
<PAGE>

     Participants, (b) State Street Bank and Trust Company, as Owner Trustee,
     (c) Bank of America, N.A. as Collateral Agent, Liquidity Agent and
     Administrator for the Note Lender, (d) Bayerische Landesbank Girozentrale
     (Cayman Islands Branch) and The Dai-Ichi Kangyo Bank, Ltd. (New York
     Branch), as Co-Agents, (e) Enterprise Funding corporation, as Note Lender,
     (f) the Committed Lenders from time to time party thereto, (g) Phillips
     Petroleum Company and USX as guarantors, and (g) Kenai Tankers LLC, Polar
     Eagle Shipping Company, Ltd. and Arctic Sun Shipping Company, Ltd., as
     charterers.

4)   Loan Agreement between USX Capital LLC, a limited life company organized
     under the laws of the Turks and Caicos Islands, and USX Corporation dated
     March 3, 1994 (MIPS).

5)   Promissory Note dated as of March 30, 2001 issued by USX to Dresdner
     Kleinwort Benson North America Leasing, Inc.

6)   Guarantee Agreement between the European Investment Bank (the "Bank") and
     USX dated 25 July 1991.

7)   6.75% Convertible Junior Subordinated Debentures issued pursuant to the
     Multiple Series Indenture dated as of May 16, 1997 between USX Corporation,
     as Issuer, and The Bank of New York, as Trustee as supplemented by the
     First Supplemental Indenture dated as of May 16, 1997 and a Second
     Supplemental Indenture dated as of July 2, 2001 between USX Corporation, as
     Issuer, and The Bank of New York, as Trustee. Such debt supports the
     obligations incurred in connection with the 6.75% Convertible Quarterly
     Income Preferred Securities issued by USX Capital Trust I, a Delaware
     statutory business trust (QUIPS).

8)   6.50% Cumulative Convertible Preferred Stock of USX Corporation.

9)   Guaranty made as of November 15, 1983 (together with all amendments and
     supplements thereto) from USX Corporation in favor of Tower Associates, a
     New York limited partnership (Marathon Tower).

                                 Schedule 3.1
                                    Page 2

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