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Information Relating to the Consolidated Statement of Cash Flows (Details 1) (USD $)
Share data in Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Laurel Mountain Midstream LLC [Member]
Jun. 30, 2011
Atlas Energy Inc [Member]
Additional Information Relating to the Consolidated Statement of Cash Flows (Textuals) [Abstract]        
Acquisition of Atlas Energy purchase price       $ 3,000,000,000
Advance to Atlas Energy     403,000,000 403,000,000
Purchase of Interest in Laurel Mountain Midstream     49.00%  
Cash payment of equity awards included in net decrease in operating working capital       184,000,000
Repayment of Atlas debt       761,000,000
Payoff of Atlas revolving credit facility       271,000,000
Information Relating to the Consolidated Statement of Cash Flows (Textuals) [Abstract]        
Reduction for income tax benefits associated with stock options exercised 116,000,000 23,000,000    
Purchases of treasury shares 1,800,000,000 13,000,000    
Common share purchase 17.3      
Share repurchase value $ 1,750,000,000