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Acquisitions and Divestitures (Tables)
6 Months Ended
Jun. 30, 2012
Acquisitions and Divestitures [Abstract]  
Assets acquired and liabilities assumed as of the acquisition date
         
    (In millions)  

Current assets

  $ 56  

Proved properties

    1,040  

Unproved properties

    2,288  

Gathering, transmission and processing facilities

    1  
   

 

 

 

Total assets acquired

  $ 3,385  
   

 

 

 

Current liabilities

    86  

Non-current obligations

    5  
   

 

 

 

Total liabilities assumed

  $ 91  
   

 

 

 

Net assets acquired

  $ 3,294  
   

 

 

 
         
    (In millions)  

Current assets

  $ 208  

Proved properties

    2,341  

Unproved properties

    476  

Gathering, transmission and processing facilities

    338  

Goodwill (1)

    82  
   

 

 

 

Total assets acquired

  $ 3,445  
   

 

 

 

Current liabilities

    148  

Asset retirement obligation

    517  

Deferred income tax liabilities

    1,533  

Other long-term obligations

    1  
   

 

 

 

Total liabilities assumed

  $ 2,199  
   

 

 

 

Net assets acquired

  $ 1,246