<ARTICLE>                     5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
     THE COMPANY'S BALANCE SHEET AT MARCH 31, 2000 AND INCOME STATEMENT FOR
     THE THREE MONTHS ENDED MARCH 31, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY
     REFERENCE TO SUCH FINANCIAL STATEMENTS AND THEIR RELATED FOOTNOTES.
</LEGEND>
<MULTIPLIER>                                   1,000,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>               DEC-31-2000
<PERIOD-END>                    MAR-31-2000
<CASH>                                         1,185
<SECURITIES>                                     627
<RECEIVABLES>                                  4,050
<ALLOWANCES>                                      37
<INVENTORY>                                    1,448
<CURRENT-ASSETS>                               8,517
<PP&E>                                        54,293
<DEPRECIATION>                                29,111
<TOTAL-ASSETS>                                41,249
<CURRENT-LIABILITIES>                          9,083
<BONDS>                                        5,400
<PREFERRED-MANDATORY>                              0
<PREFERRED>                                        0
<COMMON>                                       1,069
<OTHER-SE>                                    16,936
<TOTAL-LIABILITY-AND-EQUITY>                  41,249
<SALES>                                       11,356
<TOTAL-REVENUES>                              11,698
<CGS>                                              0
<TOTAL-COSTS>                                  9,849
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                               129
<INCOME-PRETAX>                                1,849
<INCOME-TAX>                                     805
<INCOME-CONTINUING>                            1,044
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                   1,044
<EPS-BASIC>                                   1.59
<EPS-DILUTED>                                   1.59