<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 INFORMATION.
</LEGEND>
<MULTIPLIER> 1,000,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 2
<SECURITIES> 0
<RECEIVABLES> 203
<ALLOWANCES> 13
<INVENTORY> 28
<CURRENT-ASSETS> 242
<PP&E> 3,749
<DEPRECIATION> 2,340
<TOTAL-ASSETS> 1,906
<CURRENT-LIABILITIES> 542
<BONDS> 566
0
0
<COMMON> 448
<OTHER-SE> 138
<TOTAL-LIABILITY-AND-EQUITY> 1,906
<SALES> 607
<TOTAL-REVENUES> 607
<CGS> 0
<TOTAL-COSTS> 375
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 28
<INCOME-PRETAX> 205
<INCOME-TAX> 78
<INCOME-CONTINUING> 127
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 127
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>