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Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 07, 2021
Jun. 30, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
a
Jun. 30, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Conversion of common stock into right to recieve per share 0.5165   0.5165  
Restricted cash   $ 191 $ 191 $ 195
Area of land | a   50,000 50,000  
Barnett Shale [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash   $ 180 $ 180  
Cash payments for divestitures   $ 10    
Devon and WPX Agreement [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Date of agreement Jan. 07, 2021      
Conversion of common stock into right to recieve 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% 50.00%