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Acquisition of Atlas Energy Inc. (Tables)
6 Months Ended
Jun. 30, 2011
Acquisition of Atlas Energy, Inc. [Abstract]  
Preliminary allocation of the purchase price to Atlas's assets and liabilities
         
    At February 17, 2011
    (Millions of dollars)
 
Current assets
    $    150  
Investments and long-term receivables
    456  
Properties
    6,051  
Goodwill
    39  
Other assets
    5  
         
Total assets acquired
    6,701  
         
Current liabilities
    (560 )
Long-term debt and capital leases
    (761 )
Deferred income taxes
    (1,918 )
Other liabilities
    (25 )
         
Total liabilities assumed
    (3,264 )
         
Net assets acquired
    $ 3,437