<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE REVISED
CONDENSED STATEMENT OF INCOME FOR THE SIX MONTHS ENDED JUNE 30, 2000 AND THE
REVISED CONDENSED BALANCE SHEET AT JUNE 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<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> 56
<SECURITIES> 0
<RECEIVABLES> 1,085
<ALLOWANCES> 82
<INVENTORY> 40
<CURRENT-ASSETS> 1,388
<PP&E> 15,423
<DEPRECIATION> 9,043
<TOTAL-ASSETS> 8,025
<CURRENT-LIABILITIES> 2,166
<BONDS> 1,930
0
0
<COMMON> 1
<OTHER-SE> 1,955
<TOTAL-LIABILITY-AND-EQUITY> 8,025
<SALES> 0
<TOTAL-REVENUES> 2,342
<CGS> 0
<TOTAL-COSTS> 1,798
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 83
<INCOME-PRETAX> 474
<INCOME-TAX> 186
<INCOME-CONTINUING> 288
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 288
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>