<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 53
<SECURITIES> 0
<RECEIVABLES> 2,755
<ALLOWANCES> 0
<INVENTORY> 180
<CURRENT-ASSETS> 3,871
<PP&E> 5,267
<DEPRECIATION> 2,108
<TOTAL-ASSETS> 10,042
<CURRENT-LIABILITIES> 4,346
<BONDS> 2,040
450
0
<COMMON> 94
<OTHER-SE> 1,468
<TOTAL-LIABILITY-AND-EQUITY> 10,042
<SALES> 0
<TOTAL-REVENUES> 18,606
<CGS> 0
<TOTAL-COSTS> 17,697
<OTHER-EXPENSES> 654
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 164
<INCOME-PRETAX> 235
<INCOME-TAX> 77
<INCOME-CONTINUING> 159
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 159
<EPS-BASIC> 1.71
<EPS-DILUTED> 1.69
</TABLE>