<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S CONSOLIDATED STATEMENTS OF INCOME AND CONSOLIDATED BALANCE SHEETS AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                             297
<SECURITIES>                                        28
<RECEIVABLES>                                      404
<ALLOWANCES>                                        39
<INVENTORY>                                         81
<CURRENT-ASSETS>                                   927
<PP&E>                                           6,091
<DEPRECIATION>                                   1,139
<TOTAL-ASSETS>                                   7,676
<CURRENT-LIABILITIES>                              862
<BONDS>                                          2,745
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                         15
<COMMON>                                           627
<OTHER-SE>                                       2,712
<TOTAL-LIABILITY-AND-EQUITY>                     7,676
<SALES>                                          2,663
<TOTAL-REVENUES>                                 2,663
<CGS>                                                0
<TOTAL-COSTS>                                    2,242
<OTHER-EXPENSES>                                    35
<LOSS-PROVISION>                                    26
<INTEREST-EXPENSE>                                  88
<INCOME-PRETAX>                                    286
<INCOME-TAX>                                       118
<INCOME-CONTINUING>                                161
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       161
<EPS-PRIMARY>                                      .62
<EPS-DILUTED>                                      .62