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Acquisition of Atlas Energy Inc. (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Feb. 17, 2011
Acquisition of Atlas Energy Inc (Textuals) [Abstract]      
Purchase price of Atlas     $ 4,500,000,000
Assigned goodwill to the US within the upstream segment     39,000,000
Maximum period for adjustments to provisional fair value measurements up to one year    
Discount rate on future commodity prices 8.00%    
Fair value of consideration transferred     3,400,000,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount     0
Atlas Energy Inc [Member]
     
Acquisition of Atlas Energy Inc (Textuals) [Abstract]      
Cash purchase of equity interest 3,000,000,000 3,000,000,000 3,000,000,000
Advance to Atlas Energy   403,000,000  
Assumed Debt of Atlas     1,100,000,000
Payment to cash out Atlas equity awards 184,000,000    
Laurel Mountain Midstream LLC [Member]
     
Acquisition of Atlas Energy Inc (Textuals) [Abstract]      
Advance to Atlas Energy 403,000,000    
Purchase of Interest in Laurel Mountain Midstream 49.00% 49.00% 49.00%
Upstream Segment
     
Acquisition of Atlas Energy Inc (Textuals) [Abstract]      
Assigned goodwill to the US within the upstream segment     $ 39,000,000