<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED STATEMENT OF INCOME FOR THE NINE MONTHS ENDED SEPTEMBER
30, 1999 AND THE CONDENSED CONSOLIDATED BALANCE SHEET AT 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>                                             264
<SECURITIES>                                        35
<RECEIVABLES>                                    7,536
<ALLOWANCES>                                       607
<INVENTORY>                                        624
<CURRENT-ASSETS>                                 8,897
<PP&E>                                          87,739
<DEPRECIATION>                                  49,380
<TOTAL-ASSETS>                                  59,022
<CURRENT-LIABILITIES>                           11,369
<BONDS>                                         17,463
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           158
<OTHER-SE>                                      15,351
<TOTAL-LIABILITY-AND-EQUITY>                    59,022
<SALES>                                              0
<TOTAL-REVENUES>                                24,566
<CGS>                                                0
<TOTAL-COSTS>                                   18,223
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 939
<INCOME-PRETAX>                                  5,563
<INCOME-TAX>                                     2,074
<INCOME-CONTINUING>                              3,489
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                    (6)
<CHANGES>                                            0
<NET-INCOME>                                     3,483
<EPS-BASIC>                                       2.24
<EPS-DILUTED>                                     2.20