<ARTICLE>                     5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
     THE COMPANY'S BALANCE SHEET AT JUNE 30, 1999 AND INCOME STATEMENT FOR THE
     SIX MONTHS ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
     REFERENCNE TO SUCH FINCANCIAL STATEMENTS AND THEIR RELATED FOOTNOTES.
</LEGEND>
<MULTIPLIER>                                   1,000,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>               DEC-31-1999
<PERIOD-END>                    JUN-30-1999
<CASH>                                  752
<SECURITIES>                            955
<RECEIVABLES>                         3,054
<ALLOWANCES>                             27
<INVENTORY>                           1,416
<CURRENT-ASSETS>                      7,157
<PP&E>                               52,674
<DEPRECIATION>                       28,244
<TOTAL-ASSETS>                       38,402
<CURRENT-LIABILITIES>                 9,347
<BONDS>                               4,319
<PREFERRED-MANDATORY>                     0
<PREFERRED>                               0
<COMMON>                              1,069
<OTHER-SE>                           16,077
<TOTAL-LIABILITY-AND-EQUITY>         38,402
<SALES>                              14,872
<TOTAL-REVENUES>                     15,430
<CGS>                                     0
<TOTAL-COSTS>                        14,339
<OTHER-EXPENSES>                          0
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                      218
<INCOME-PRETAX>                       1,091
<INCOME-TAX>                            412
<INCOME-CONTINUING>                     679
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                            679
<EPS-BASIC>                          1.04
<EPS-DILUTED>                          1.03