<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                         882,300
<SECURITIES>                                    74,500
<RECEIVABLES>                                1,823,300
<ALLOWANCES>                                    44,600
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<CURRENT-ASSETS>                             4,613,700
<PP&E>                                      15,576,100
<DEPRECIATION>                               8,699,100
<TOTAL-ASSETS>                              13,532,200
<CURRENT-LIABILITIES>                        2,356,900
<BONDS>                                      1,792,600
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                     55,800
<COMMON>                                       178,900
<OTHER-SE>                                   4,375,200
<TOTAL-LIABILITY-AND-EQUITY>                13,532,200
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<CGS>                                        5,091,100
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<LOSS-PROVISION>                                     0
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<EPS-PRIMARY>                                     2.11
<EPS-DILUTED>                                     2.09