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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 2,051 $ 4,108 $ 1,462 $ 837
Short-term derivative assets 387 879    
Proved natural gas and oil properties 62,161 58,594    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 50,302 39,043    
Current liabilities 2,649 3,061    
Non-Guarantor Subsidiaries [Member]        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 30 84 $ 91 $ 38
Current liabilities 56 68    
Variable Interest Entities, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 1 1    
Short-term derivative assets 5 16    
Proved natural gas and oil properties 488 488    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 361 251    
Current liabilities $ 11 $ 15    
Variable Interest Entities, Primary Beneficiary [Member] | Non-Guarantor Subsidiaries [Member] | Limited Partner [Member]        
Variable Interest Entity [Line Items]        
Percentage of acquisition 10.00%      
Variable interest entity, carrying value of investment $ 10      
Variable Interest Entities, Primary Beneficiary [Member] | Non-Guarantor Subsidiaries [Member] | Limited Partner [Member] | Minimum [Member]        
Variable Interest Entity [Line Items]        
Royalty percentage minimum 7.00%      
Royalty percentage maximum 7.00%      
Variable Interest Entities, Primary Beneficiary [Member] | Non-Guarantor Subsidiaries [Member] | Limited Partner [Member] | Maximum [Member]        
Variable Interest Entity [Line Items]        
Other Commitment $ 25      
Royalty percentage minimum 22.50%      
Royalty percentage maximum 22.50%      
Majority-Owned Subsidiary, Unconsolidated [Member] | Non-Guarantor Subsidiaries [Member] | Limited Partner [Member]        
Variable Interest Entity [Line Items]        
Percentage of acquisition 90.00%      
Majority-Owned Subsidiary, Unconsolidated [Member] | Non-Guarantor Subsidiaries [Member] | Limited Partner [Member] | Maximum [Member]        
Variable Interest Entity [Line Items]        
Other Commitment $ 225