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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]            
Noncontrolling interests $ 259   $ 259   $ 259  
Net income attributable to noncontrolling interests 1 $ 13 1 $ 50    
VIE, cash and cash equivalents 4 1,759 4 1,759 825 $ 4,108
VIE. proved natural gas and oil properties 65,977   65,977   63,843  
VIE. accumulated depreciation, depletion and amortization (62,296)   (62,296)   (59,365)  
VIE, other current liabilities 1,993   1,993      
Variable Interest Entities, Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
VIE, cash and cash equivalents 1   1   1  
VIE. proved natural gas and oil properties 488   488   488  
VIE. accumulated depreciation, depletion and amortization (457)   (457)   $ (428)  
VIE, other current liabilities 2   2      
Noncontrolling Interest, Chesapeake Granite Wash Trust [Member]            
Variable Interest Entity [Line Items]            
Net income attributable to noncontrolling interests $ 1 $ 1 $ 1 $ 0