<ARTICLE>                     5
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  FINANCIAL   INFORMATION  EXTRACTED  FROM  THE
COMPANY'S  BALANCE SHEET AT JUNE 30, 1998 AND INCOME STATEMENT FOR THE SIX MONTH
PERIOD ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS AND THEIR RELATED FOOTNOTES.
</LEGEND>
<MULTIPLIER>  1,000,000
       
                             
<PERIOD-TYPE>                   6-MOS        
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                          1,185
<SECURITIES>                                      525
<RECEIVABLES>                                   2,981
<ALLOWANCES>                                       31
<INVENTORY>                                     1,445
<CURRENT-ASSETS>                                6,879
<PP&E>                                         50,247
<DEPRECIATION>                                 27,143
<TOTAL-ASSETS>                                 36,176
<CURRENT-LIABILITIES>                           7,305
<BONDS>                                         4,349
<PREFERRED-MANDATORY>                               0
<PREFERRED>                                         0  
<COMMON>                                        1,069
<OTHER-SE>                                     16,605
<TOTAL-LIABILITY-AND-EQUITY>                   36,176
<SALES>                                        15,218
<TOTAL-REVENUES>                               15,622
<CGS>                                               0
<TOTAL-COSTS>                                  13,964
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                                193
<INCOME-PRETAX>                                 1,658
<INCOME-TAX>                                      581
<INCOME-CONTINUING>                             1,077
<DISCONTINUED>                                      0
<EXTRAORDINARY>                                     0
<CHANGES>                                           0
<NET-INCOME>                                    1,077
<EPS-PRIMARY>                                    1.65
<EPS-DILUTED>                                    1.64