<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> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 94
<SECURITIES> 0
<RECEIVABLES> 330
<ALLOWANCES> 28
<INVENTORY> 22
<CURRENT-ASSETS> 830
<PP&E> 4,901
<DEPRECIATION> 2,989
<TOTAL-ASSETS> 3,121
<CURRENT-LIABILITIES> 1,013
<BONDS> 892
0
0
<COMMON> 585
<OTHER-SE> 176
<TOTAL-LIABILITY-AND-EQUITY> 3,121
<SALES> 818
<TOTAL-REVENUES> 818
<CGS> 0
<TOTAL-COSTS> 646
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 78
<INCOME-PRETAX> 137
<INCOME-TAX> 58
<INCOME-CONTINUING> 79
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 79
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>