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Asset Acquisitions, Dispositions and Other Transactions (Details) (USD $)
9 Months Ended3 Months Ended
Sep. 30, 2011
Domestic Oil and Gas Properties
Mar. 31, 2011
Shah Field gas development project
Y
May 31, 2011
Shah Field gas development project
Asset acquisitions, dispositions and other transactions   
Significant acquisitions, purchase price$ 3,600,000,000  
Percentage of interest acquired in oil and gas properties and projects (as a percent) 40.00% 
Term of joint venture agreement (in years) 30 
Total project amount 10,000,000,000 
Joint venture, entity's portion 4,000,000,000 
Share of previously incurred development expenditures paid  $ 500,000,000