<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ACCOMPANYING FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                               1
<SECURITIES>                                         0
<RECEIVABLES>                                      288
<ALLOWANCES>                                      (20)
<INVENTORY>                                         25
<CURRENT-ASSETS>                                   357
<PP&E>                                           4,818
<DEPRECIATION>                                   3,024
<TOTAL-ASSETS>                                   2,489
<CURRENT-LIABILITIES>                              440
<BONDS>                                            789
                                0
                                          0
<COMMON>                                           525
<OTHER-SE>                                         152
<TOTAL-LIABILITY-AND-EQUITY>                     2,489
<SALES>                                          1,172
<TOTAL-REVENUES>                                 1,172
<CGS>                                                0
<TOTAL-COSTS>                                      823
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  81
<INCOME-PRETAX>                                    268
<INCOME-TAX>                                       105
<INCOME-CONTINUING>                                163
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       163
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0


</TABLE>



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