Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2011
Accrued Liabilities 
Accrued Liabilities
         
    September 30, 2011 December 31, 2010
       
       
    (In millions)
 Revenue payable $ 80 $ 69
 Accrued capital costs   369   327
 Accrued lease operating expenses   75   54
 Employee incentive expense   54   59
 Accrued interest on debt   43   41
 Taxes payable   106   81
 Other   20   39
  Total accrued liabilities $ 747 $ 670