<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> 637
<ALLOWANCES> 41
<INVENTORY> 53
<CURRENT-ASSETS> 920
<PP&E> 9,994
<DEPRECIATION> 6,680
<TOTAL-ASSETS> 5,822
<CURRENT-LIABILITIES> 888
<BONDS> 1,744
0
0
<COMMON> 978
<OTHER-SE> 1,071
<TOTAL-LIABILITY-AND-EQUITY> 5,822
<SALES> 2,371
<TOTAL-REVENUES> 2,371
<CGS> 0
<TOTAL-COSTS> 1,150
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 100
<INCOME-PRETAX> 1,121
<INCOME-TAX> 423
<INCOME-CONTINUING> 698
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 698
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>