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Summary Of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Jan. 07, 2021
Mar. 31, 2020
Jun. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
a
Customer
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]            
Conversion of common stock into right to received per share 0.5165          
Number of customers | Customer       2   0
Derivative collateral held       $ 0    
Cash collateral posted       0    
Restricted cash       172,000,000 $ 190,000,000 $ 380,000,000
Goodwill, Impairment Loss       0 0 0
Percentage of common stock decreased   73.00%        
Foreign currency translation adjustment [1]           $ 1,237,000,000
Barnett Shale [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Restricted cash       $ 160,000,000 $ 190,000,000  
Canadian Business Segment [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Foreign currency translation adjustment     $ 1,200,000,000      
Minimum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Other property and equipment, useful life       3 years    
Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Other property and equipment, useful life       60 years    
Customer Concentration Risk [Member] | OneCustomerMember | Consolidated Sales Revenue [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage       19.00% 13.00%  
Customer Concentration Risk [Member] | Two Customer [Member] | Consolidated Sales Revenue [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage       12.00% 10.00%  
Customer Concentration Risk [Member] | Minimum [Member] | OneCustomerMember | Consolidated Sales Revenue [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage           10.00%
Customer Concentration Risk [Member] | Minimum [Member] | Major Customers [Member] | Consolidated Sales Revenue [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage       10.00%    
Upstream Revenues [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of days allowed for payment from end of production month       30 days    
Marketing Revenues [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of days allowed for payment of invoiced amount       30 days    
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Foreign currency translation adjustment           $ 1,200,000,000
CDM [Member] | QL Capital Partners, LP [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Cash distribution from entities       $ 14,000,000 $ 20,000,000 116,000,000
Cash contributed to entities       $ 21,000,000 $ 3,000,000 $ 116,000,000
Devon and WPX Agreement [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Date of agreement Jan. 07, 2021     Jan. 07, 2021    
Conversion of common stock into right to received per share 0.5165          
WPX and Howard Energy Partners [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Voting interest in the join venture legal entity       50.00%    
Catalyst [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Area of land | a       50,000    
Investment in Catalyst       $ 368,000,000    
Net assets       $ 125,000,000    
[1] In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.