<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> 1
<SECURITIES> 0
<RECEIVABLES> 665
<ALLOWANCES> 45
<INVENTORY> 51
<CURRENT-ASSETS> 976
<PP&E> 9,886
<DEPRECIATION> 6,597
<TOTAL-ASSETS> 5,799
<CURRENT-LIABILITIES> 983
<BONDS> 1,745
0
0
<COMMON> 978
<OTHER-SE> 1,010
<TOTAL-LIABILITY-AND-EQUITY> 5,799
<SALES> 1,578
<TOTAL-REVENUES> 1,578
<CGS> 0
<TOTAL-COSTS> 895
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 69
<INCOME-PRETAX> 615
<INCOME-TAX> 242
<INCOME-CONTINUING> 373
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 373
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>