<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Company's Form 10-Q for the quarterly period ended September 30, 1999 and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                             425
<SECURITIES>                                         0
<RECEIVABLES>                                      608
<ALLOWANCES>                                         0
<INVENTORY>                                         76
<CURRENT-ASSETS>                                 1,394
<PP&E>                                          22,215
<DEPRECIATION>                                   6,075
<TOTAL-ASSETS>                                  20,467
<CURRENT-LIABILITIES>                            2,355
<BONDS>                                          6,289
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            17
<OTHER-SE>                                      15,400
<TOTAL-LIABILITY-AND-EQUITY>                    20,467
<SALES>                                          7,088
<TOTAL-REVENUES>                                 9,886
<CGS>                                            5,819
<TOTAL-COSTS>                                    6,365
<OTHER-EXPENSES>                                  (55)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 298
<INCOME-PRETAX>                                  2,174
<INCOME-TAX>                                       712
<INCOME-CONTINUING>                              1,462
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,462
<EPS-BASIC>                                     1.08
<EPS-DILUTED>                                     1.04