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Asset Retirement Obligation
9 Months Ended
Sep. 30, 2011
Asset Retirement Obligation [Abstract] 
ASSET RETIREMENT OBLIGATION
4. ASSET RETIREMENT OBLIGATION
     The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the quarter ended September 30, 2011:
         
    (In millions)  
Asset retirement obligation at December 31, 2010
  $ 2,872  
Liabilities incurred
    288  
Liabilities acquired
    75  
Liabilities settled
    (419 )
Accretion expense
    114  
 
     
Asset retirement obligation at September 30, 2011
    2,930  
 
Less current portion
    (327 )
 
     
 
Asset retirement obligation, long-term
  $ 2,603