<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED STATEMENT OF INCOME FOR THE SIX MONTHS ENDED JUNE 30,
2000 AND THE CONDENSED CONSOLIDATED BALANCE SHEET AT JUNE 30, 2000 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> 112
<SECURITIES> 0
<RECEIVABLES> 1,663
<ALLOWANCES> 196
<INVENTORY> 47
<CURRENT-ASSETS> 3,165
<PP&E> 24,873
<DEPRECIATION> 13,997
<TOTAL-ASSETS> 14,980
<CURRENT-LIABILITIES> 5,619
<BONDS> 3,617
0
0
<COMMON> 1
<OTHER-SE> 2,237
<TOTAL-LIABILITY-AND-EQUITY> 14,980
<SALES> 0
<TOTAL-REVENUES> 4,260
<CGS> 0
<TOTAL-COSTS> 3,709
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 183
<INCOME-PRETAX> 412
<INCOME-TAX> 140
<INCOME-CONTINUING> 272
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 272
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>