<ARTICLE> 5
<LEGEND>
Schedule contains summary financial information extracted from the condensed
consolidated financial statements and is qualified in its entirety by reference
to such financial statements.
</LEGEND>

<MULTIPLIER>                                 1,000,000
       
                                        
<PERIOD-TYPE>                                    3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                              94
<SECURITIES>                                         0
<RECEIVABLES>                                      699
<ALLOWANCES>                                         0
<INVENTORY>                                        275
<CURRENT-ASSETS>                                 1,454
<PP&E>                                          30,476
<DEPRECIATION>                                   5,230
<TOTAL-ASSETS>                                  28,186
<CURRENT-LIABILITIES>                            3,109
<BONDS>                                          8,075
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           688
<OTHER-SE>                                       7,551
<TOTAL-LIABILITY-AND-EQUITY>                    28,186
<SALES>                                              0
<TOTAL-REVENUES>                                 2,810
<CGS>                                                0
<TOTAL-COSTS>                                    2,465
<OTHER-EXPENSES>                                    28
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 150
<INCOME-PRETAX>                                    205
<INCOME-TAX>                                        77
<INCOME-CONTINUING>                                128
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       128
<EPS-PRIMARY>                                     0.52
<EPS-DILUTED>                                        0