<ARTICLE> 5
<LEGEND>
This schedule contains summary information extracted from the Company's Form
10-K for the year ended December 31, 1998 and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                             299
<SECURITIES>                                         0
<RECEIVABLES>                                      609
<ALLOWANCES>                                         0
<INVENTORY>                                         77
<CURRENT-ASSETS>                                 1,309
<PP&E>                                          21,758
<DEPRECIATION>                                   5,716
<TOTAL-ASSETS>                                  19,784
<CURRENT-LIABILITIES>                            2,497
<BONDS>                                          6,189
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            17
<OTHER-SE>                                      14,198
<TOTAL-LIABILITY-AND-EQUITY>                    19,784
<SALES>                                          8,895
<TOTAL-REVENUES>                                12,421
<CGS>                                            7,262
<TOTAL-COSTS>                                    7,940
<OTHER-EXPENSES>                                   261
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 414
<INCOME-PRETAX>                                  2,307
<INCOME-TAX>                                       757
<INCOME-CONTINUING>                              1,550
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,550
<EPS-PRIMARY>                                     1.14<F1>
<EPS-DILUTED>                                     1.10<F1>
<FN>
<F1>The EPS amounts above reflect a two-for-one stock split effected in March
1999 with respect to the Company's common stock. Financial data schedules for
prior years have not been restated.
</FN>