<ARTICLE>                     5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 
COMPANY'S BALANCE SHEET AT MARCH 31, 1999 AND INCOME STATEMENT FOR THE 
THREE MONTHS ENDED MARCH 31, 1999 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-31-1999
<PERIOD-END>                    MAR-31-1999
<CASH>                              538
<SECURITIES>                        947
<RECEIVABLES>                     2,800  
<ALLOWANCES>                         27
<INVENTORY>                       1,429
<CURRENT-ASSETS>                  6,459
<PP&E>                           52,162 
<DEPRECIATION>                   27,763
<TOTAL-ASSETS>                   37,766
<CURRENT-LIABILITIES>             7,991
<BONDS>                           4,338
<PREFERRED-MANDATORY>                 0
<PREFERRED>                           0
<COMMON>                          1,069      
<OTHER-SE>                       16,121
<TOTAL-LIABILITY-AND-EQUITY>     37,766
<SALES>                           6,399
<TOTAL-REVENUES>                  6,689
<CGS>                                 0
<TOTAL-COSTS>                     6,175     
<OTHER-EXPENSES>                      0
<LOSS-PROVISION>                      0
<INTEREST-EXPENSE>                  105   
<INCOME-PRETAX>                     514
<INCOME-TAX>                        185
<INCOME-CONTINUING>                 329
<DISCONTINUED>                        0 
<EXTRAORDINARY>                       0
<CHANGES>                             0
<NET-INCOME>                        329
<EPS-PRIMARY>                      0.50  
<EPS-DILUTED>                      0.50