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Acquisitions And Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
a
Jul. 31, 2016
USD ($)
Nov. 30, 2015
USD ($)
May 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
mi
MMcf
Jan. 31, 2015
USD ($)
a
MMcf
Dec. 31, 2014
USD ($)
a
MMcf
Sep. 30, 2016
a
Jun. 30, 2016
Sep. 30, 2016
USD ($)
a
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
a
item
MMcf
Business Acquisition [Line Items]                          
Payments on long-term debt                   $ 1,175 $ 500    
Capital spending                   $ 391 $ 1,392    
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] | 2015 Term Facility [Member]                          
Business Acquisition [Line Items]                          
Payments on long-term debt $ 48 $ 375                      
Loans payable     $ 750                    
Maturity date, year and month               2020-12 2018-11     2018-11  
Debt instrument, term     3 years                    
Long-term Debt [Member] | Term Loan due December 2016 [Member]                          
Business Acquisition [Line Items]                          
Loans payable             $ 500           $ 500
Maturity date, year and month                   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                   $ 15   $ 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]                          
Area of land purchased | a             413,000           413,000
Cash consideration             $ 5,000            
West Virginia [Member]                          
Business Acquisition [Line Items]                          
Area of land sold | a 55,000             55,000   55,000      
Proceeds from sale of oil and gas property and equipment $ 426                        
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