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Acquisitions And Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
a
May 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
mi
MMcf
Jan. 31, 2015
USD ($)
a
MMcf
Dec. 31, 2014
USD ($)
a
MMcf
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
a
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
a
item
MMcf
Business Acquisition [Line Items]                    
Capital spending             $ 241 $ 974    
Area of land purchased | a         413,000         413,000
Bridge Loan [Member]                    
Business Acquisition [Line Items]                    
Bridge loan       $ 4,500 $ 4,500       $ 4,500 $ 4,500
Debt instrument, term       364 days 364 days       364 days  
Debt issuance costs       $ 47            
Long-term Debt [Member] | Term Loan due December 2016 [Member]                    
Business Acquisition [Line Items]                    
Loans payable $ 500       $ 500   $ 500     $ 500
Maturity date, month and year             2016-12      
Debt instrument, term         2 years          
WPX Property Acquisition [Member]                    
Business Acquisition [Line Items]                    
Area of land purchased | a       46,700            
Cash consideration       $ 270            
Net production per day of acreage sold in MMcf | MMcf         50         50
Number of horizontal wells operated | item                   63
Firm transportation capacity assumed, per day | MMcf       260            
Firm transportation, useful life       19 years            
Amortization             $ 13   $ 8  
Statoil Property Acquisition [Member]                    
Business Acquisition [Line Items]                    
Area of land purchased | a       30,000            
Percentage of interest acquired       20.00%            
Cost to acquire property       $ 357            
Chesapeake Property Acquisition [Member]                    
Business Acquisition [Line Items]                    
Cash consideration         $ 5,000          
West Virginia [Member]                    
Business Acquisition [Line Items]                    
Area of land sold | a 55,000           55,000      
Proceeds from sale of oil and gas property and equipment $ 450                  
Deposit received $ 45           $ 45      
East Texas and Arkoma Basin [Member]                    
Business Acquisition [Line Items]                    
Proceeds from sale of oil and gas property and equipment   $ 211                
Reduction in capitalized costs relating to proceeds   $ (205)                
Bradford And Lycoming Counties, Pennsylvania [Member]                    
Business Acquisition [Line Items]                    
Proceeds from sale of oil and gas property and equipment     $ 489              
Net book value     206              
Gain on sale of property     $ 283              
Number of miles of natural gas gathering pipeline | mi     100              
Pipeline capacity per day | MMcf     600              
Scenario, Forecast [Member]                    
Business Acquisition [Line Items]                    
Capital spending           $ 375