<ARTICLE> 5
<MULTIPLIER> 1,000,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                             170
<SECURITIES>                                         0
<RECEIVABLES>                                    1,988
<ALLOWANCES>                                         0
<INVENTORY>                                        136
<CURRENT-ASSETS>                                 4,669
<PP&E>                                          13,742
<DEPRECIATION>                                   4,572
<TOTAL-ASSETS>                                  23,422
<CURRENT-LIABILITIES>                            4,412
<BONDS>                                          6,254
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                        134
<COMMON>                                         4,224
<OTHER-SE>                                       1,260
<TOTAL-LIABILITY-AND-EQUITY>                    23,422
<SALES>                                         18,312
<TOTAL-REVENUES>                                20,273
<CGS>                                           17,311
<TOTAL-COSTS>                                   20,258
<OTHER-EXPENSES>                                 (550)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 401
<INCOME-PRETAX>                                     15
<INCOME-TAX>                                      (90)
<INCOME-CONTINUING>                                105
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       105
<EPS-PRIMARY>                                     0.32
<EPS-DILUTED>                                     0.32