<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S BALANCE SHEET AT SEPTEMBER 30, 1997 AND INCOME STATEMENT FOR THE
NINE MONTH PERIOD ENDED SEPTEMBER 30, 1997 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-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                           991
<SECURITIES>                                       573
<RECEIVABLES>                                    3,509
<ALLOWANCES>                                        45
<INVENTORY>                                      1,409
<CURRENT-ASSETS>                                 7,241
<PP&E>                                          48,941
<DEPRECIATION>                                  26,564
<TOTAL-ASSETS>                                  35,471
<CURRENT-LIABILITIES>                            7,325
<BONDS>                                          4,464
<COMMON>                                         1,069
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                      15,984
<TOTAL-LIABILITY-AND-EQUITY>                    35,471
<SALES>                                         30,871
<TOTAL-REVENUES>                                31,695
<CGS>                                                0
<TOTAL-COSTS>                                   27,591
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 227
<INCOME-PRETAX>                                  4,104
<INCOME-TAX>                                     1,723
<INCOME-CONTINUING>                              2,381
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,381
<EPS-PRIMARY>                                     3.64
<EPS-DILUTED>                                     3.64