<ARTICLE>                     5
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  FINANCIAL   INFORMATION  EXTRACTED  FROM  THE
COMPANY'S  BALANCE SHEET AT SEPTEMBER 30, 1998 AND INCOME STATEMENT FOR THE NINE
PERIOD ENDED SEPTEMBER 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>                   9-MOS
<FISCAL-YEAR-END>               DEC-31-1998
<PERIOD-END>                    SEP-30-1998
<CASH>                           1,152
<SECURITIES>                       616
<RECEIVABLES>                    3,058
<ALLOWANCES>                        29
<INVENTORY>                      1,364
<CURRENT-ASSETS>                 6,839
<PP&E>                          50,954
<DEPRECIATION>                  27,439
<TOTAL-ASSETS>                  36,570
<CURRENT-LIABILITIES>            7,664 
<BONDS>                          4,309
<PREFERRED-MANDATORY>                0
<PREFERRED>                          0
<COMMON>                         1,069
<OTHER-SE>                      16,521
<TOTAL-LIABILITY-AND-EQUITY>    36,570
<SALES>                         22,779
<TOTAL-REVENUES>                23,300
<CGS>                                0
<TOTAL-COSTS>                   20,875
<OTHER-EXPENSES>                     0
<LOSS-PROVISION>                     0
<INTEREST-EXPENSE>                 296
<INCOME-PRETAX>                  2,425
<INCOME-TAX>                       887
<INCOME-CONTINUING>              1,538
<DISCONTINUED>                       0
<EXTRAORDINARY>                      0
<CHANGES>                            0
<NET-INCOME>                     1,538
<EPS-PRIMARY>                     2.35
<EPS-DILUTED>                     2.34