<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<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> 455
<SECURITIES> 397
<RECEIVABLES> 4,421
<ALLOWANCES> 111
<INVENTORY> 0
<CURRENT-ASSETS> 5,917
<PP&E> 6,775
<DEPRECIATION> 4,269
<TOTAL-ASSETS> 12,545
<CURRENT-LIABILITIES> 4,063
<BONDS> 3,001
0
0
<COMMON> 5
<OTHER-SE> 4,828
<TOTAL-LIABILITY-AND-EQUITY> 12,545
<SALES> 9,147
<TOTAL-REVENUES> 9,147
<CGS> 0
<TOTAL-COSTS> 7,491
<OTHER-EXPENSES> 844
<LOSS-PROVISION> 23
<INTEREST-EXPENSE> 106
<INCOME-PRETAX> 849
<INCOME-TAX> 306
<INCOME-CONTINUING> 543
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 543
<EPS-BASIC> 1.16
<EPS-DILUTED> 1.13
</TABLE>