<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FORM 10-Q FOR THE QUARTERLY PERIOD ENDED 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> 411
<SECURITIES> 0
<RECEIVABLES> 747
<ALLOWANCES> 0
<INVENTORY> 86
<CURRENT-ASSETS> 1,675
<PP&E> 22,901
<DEPRECIATION> 6,334
<TOTAL-ASSETS> 21,211
<CURRENT-LIABILITIES> 3,690
<BONDS> 5,786
17
0
<COMMON> 0
<OTHER-SE> 16,674
<TOTAL-LIABILITY-AND-EQUITY> 21,211
<SALES> 5,022
<TOTAL-REVENUES> 6,904
<CGS> 4,180
<TOTAL-COSTS> 4,569
<OTHER-EXPENSES> (80)
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 207
<INCOME-PRETAX> 1,436
<INCOME-TAX> 459
<INCOME-CONTINUING> 977
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 977
<EPS-BASIC> .73
<EPS-DILUTED> .71
</TABLE>