<ARTICLE> 5
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                              99
<SECURITIES>                                         0
<RECEIVABLES>                                     1697
<ALLOWANCES>                                         8
<INVENTORY>                                       2607
<CURRENT-ASSETS>                                  4843
<PP&E>                                           29355
<DEPRECIATION>                                   16632
<TOTAL-ASSETS>                                   21600
<CURRENT-LIABILITIES>                             3606
<BONDS>                                           4059
<PREFERRED-MANDATORY>                              182
<PREFERRED>                                          3
<COMMON>                                           397<F1>
<OTHER-SE>                                        6119
<TOTAL-LIABILITY-AND-EQUITY>                     21600
<SALES>                                          12809
<TOTAL-REVENUES>                                 12820
<CGS>                                            11917
<TOTAL-COSTS>                                    11917
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 174
<INCOME-PRETAX>                                    472
<INCOME-TAX>                                       173
<INCOME-CONTINUING>                                299
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      5
<CHANGES>                                            0
<NET-INCOME>                                       294
<EPS-BASIC>                                        0<F2>
<EPS-DILUTED>                                        0<F3>
<FN>
<F1>Consists of Marathon Stock issued, $309; Steel Stock issued, $88.
<F2>Basic earnings per share applicable to Marathon Stock, $.82; Steel Stock,
$.41.
<F3>Diluted earnings per share applicable to Marathon Stock, $.82; Steel Stock,
$.41.
</FN>