<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM STATEMENT OF
OPERATIONS AND BALANCE SHEET AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                             133
<SECURITIES>                                         0
<RECEIVABLES>                                    2,708
<ALLOWANCES>                                        12
<INVENTORY>                                      2,627
<CURRENT-ASSETS>                                 5,977
<PP&E>                                          29,608
<DEPRECIATION>                                  16,799
<TOTAL-ASSETS>                                  22,962
<CURRENT-LIABILITIES>                            4,316
<BONDS>                                          4,222
<PREFERRED-MANDATORY>                              183
<PREFERRED>                                          3
<COMMON>                                           400<F1>
<OTHER-SE>                                       6,453
<TOTAL-LIABILITY-AND-EQUITY>                    22,962
<SALES>                                         29,534
<TOTAL-REVENUES>                                29,583
<CGS>                                           27,720
<TOTAL-COSTS>                                   27,720
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 362
<INCOME-PRETAX>                                  1,054
<INCOME-TAX>                                       349
<INCOME-CONTINUING>                                705
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      7
<CHANGES>                                            0
<NET-INCOME>                                       698
<EPS-BASIC>                                          0<F2>
<EPS-DILUTED>                                        0<F3>
<FN>

<F1>CONSISTS OF MARATHON STOCK ISSUED, $312; STEEL STOCK ISSUED, $88.

<F2>BASIC EARNINGS PER SHARE APPLICABLE TO MARATHON STOCK, $2.11;
    STEEL STOCK, $.40.

<F3>DILUTED EARNINGS PER SHARE APPLICABLE TO MARATHON STOCK, $2.11;
    STEEL STOCK, $.40.
</FN>