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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2012
Accrued Liabilities  
Accrued Liabilities
         
    September 30, 2012 December 31, 2011
    (In millions)
 Revenue payable $ 86 $ 94
 Accrued capital costs   332   231
 Accrued lease operating expenses   84   86
 Employee incentive expense   46   61
 Accrued interest on debt   46   52
 Taxes payable   116   122
 Other   37   41
  Total accrued liabilities $ 747 $ 687