<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000,000
       
<S>                             <C>                     <C>                     <C>                      <C>                   
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                    3-MOS                 
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996              DEC-31-1997
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             JAN-01-1996              JAN-01-1997
<PERIOD-END>                               MAR-31-1996             JUN-30-1996             SEP-30-1996              MAR-31-1997
<CASH>                                             203                     180                     156                      172  
<SECURITIES>                                       529                     595                     533                      481
<RECEIVABLES>                                      395                     413                     420                      431
<ALLOWANCES>                                        17                      17                      17                       18
<INVENTORY>                                        745                     737                     757                      788
<CURRENT-ASSETS>                                 1,889                   1,943                   1,886                    1,886
<PP&E>                                           3,696                   3,729                   3,781                    3,925
<DEPRECIATION>                                     580                     642                     703                      817
<TOTAL-ASSETS>                                   5,417                   5,471                   5,414                    5,404
<CURRENT-LIABILITIES>                              912                     955                     864                      862
<BONDS>                                            150                     150                     151                      154
<PREFERRED-MANDATORY>                                0                       0                       0                        0
<PREFERRED>                                          1                       1                       1                        1
<COMMON>                                            53                      53                      53                       53
<OTHER-SE>                                       1,339                   1,384                   1,427                    1,684
<TOTAL-LIABILITY-AND-EQUITY>                     5,417                   5,471                   5,414                    5,404
<SALES>                                            993                   2,068                   3,117                    1,072
<TOTAL-REVENUES>                                   993                   2,068                   3,117                    1,072
<CGS>                                              879                   1,807                   2,717                      931
<TOTAL-COSTS>                                      981                   2,014                   3,028                    1,036
<OTHER-EXPENSES>                                  (11)                    (22)                    (33)                      (9)
<LOSS-PROVISION>                                     0                       0                       0                        0
<INTEREST-EXPENSE>                                   2                       4                       5                        0
<INCOME-PRETAX>                                     21                      72                     117                       45
<INCOME-TAX>                                         8                      27                      42                       18
<INCOME-CONTINUING>                                 13                      45                      75                       27
<DISCONTINUED>                                       0                       0                       0                        0
<EXTRAORDINARY>                                      0                       0                       0                        0
<CHANGES>                                            0                       0                       0                        0
<NET-INCOME>                                        13                      45                      75                       27
<EPS-PRIMARY>                                     0.12                    0.42                    0.69                     0.25
<EPS-DILUTED>                                     0.12                    0.42                    0.69                     0.25
        

</TABLE>