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Acquisitions (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Plains Exploration & Production Company and McMoRan Exploration Co [Member]
Jun. 30, 2013
Plains Exploration & Production Company and McMoRan Exploration Co [Member]
Jun. 30, 2014
Eagle Ford [Member]
Jun. 30, 2014
Eagle Ford [Member]
Jun. 20, 2014
Eagle Ford [Member]
Jun. 30, 2014
Deepwater Gulf of Mexico Interests [Member]
Business Acquisition [Line Items]                    
Business Acquisition, Adjustment to Oil and Gas Properties         $ 20          
Business Acquisition, Adjustment to Goodwill         22     221    
Business Acquisition, Adjustment to Deferred Income Tax Assets         (42)          
Disposal Date               Jun. 20, 2014    
Business Combination, Consideration Transferred               3,100   919
Business Acquisition, Effective Date of Acquisition               Apr. 01, 2014   Jun. 30, 2014
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances 58 (183) 58 (183)   (183) 58      
Escrow Deposit Disbursements Related to Property Acquisition 414   414       414 414 1,300  
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Subject to Depletion                   460
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Not Subject to Depletion                   $ 476