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

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>               DEC-31-1999
<PERIOD-END>                    SEP-30-1999
<CASH>                                  703
<SECURITIES>                            762
<RECEIVABLES>                         3,371
<ALLOWANCES>                             29
<INVENTORY>                           1,472
<CURRENT-ASSETS>                      7,335
<PP&E>                               54,249
<DEPRECIATION>                       28,558
<TOTAL-ASSETS>                       40,153
<CURRENT-LIABILITIES>                 9,841
<BONDS>                               4,857
<PREFERRED-MANDATORY>                     0
<PREFERRED>                               0
<COMMON>                              1,069
<OTHER-SE>                           16,251
<TOTAL-LIABILITY-AND-EQUITY>         40,153
<SALES>                              24,837
<TOTAL-REVENUES>                     25,607
<CGS>                                     0
<TOTAL-COSTS>                        23,409
<OTHER-EXPENSES>                          0
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                      334
<INCOME-PRETAX>                       2,198
<INCOME-TAX>                            937
<INCOME-CONTINUING>                   1,261
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                          1,261
<EPS-BASIC>                          1.92
<EPS-DILUTED>                          1.91