<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S BALANCE SHEET AT MARCH 31, 1998 AND INCOME STATEMENT FOR THE
THREE MONTH PERIOD ENDED MARCH 31, 1998 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-31-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                           1,265
<SECURITIES>                                       501
<RECEIVABLES>                                    3,143
<ALLOWANCES>                                        32
<INVENTORY>                                      1,439
<CURRENT-ASSETS>                                 7,064
<PP&E>                                          49,606
<DEPRECIATION>                                  26,793
<TOTAL-ASSETS>                                  35,850
<CURRENT-LIABILITIES>                            7,230
<BONDS>                                          4,362
<COMMON>                                         1,069
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                      16,408
<TOTAL-LIABILITY-AND-EQUITY>                    38,850
<SALES>                                          7,464
<TOTAL-REVENUES>                                 7,653
<CGS>                                                0
<TOTAL-COSTS>                                    6,854
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  94
<INCOME-PRETAX>                                    799
<INCOME-TAX>                                       299
<INCOME-CONTINUING>                                500
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       500
<EPS-PRIMARY>                                     0.77
<EPS-DILUTED>                                     0.76