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Acquisition and Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 07, 2021
Sep. 30, 2022
USD ($)
Jul. 31, 2022
USD ($)
MMBoe
Mar. 31, 2022
USD ($)
MMBoe
Mar. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / bbl
$ / MMBTU
Dec. 31, 2021
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Common Stock Shares Issued   $ 65       $ 65 $ 66
Eagle Ford [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Total estimated proved reserves | MMBoe     88        
Williston Basin              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Total estimated proved reserves | MMBoe     66        
Barnett Shale [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments       $ 65      
Additional contingent earnout payment           $ 195  
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU           2.75  
WTI oil price for contingent earnout payment upside | $ / bbl           50  
Contingent earnout payment period           The contingent payment period commenced on January 1, 2021 and has a term of four years.  
Barnett Shale [Member] | Other Current Assets [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments           $ 65  
Barnett Shale [Member] | Other Noncurrent Assets [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments           60  
Eagle Ford Acquisition [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Cash consideration   1,700          
Williston Acquisition [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Cash consideration     $ 830        
Non Core Assets [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Divestitures of property and equipment         $ 9    
Gain on asset dispositions         $ 35    
Contingent earnout payments       $ 4      
Change in contingent earnout payments           $ 4  
Total estimated proved reserves | MMBoe       3      
Devon and WPX Agreement [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Date of agreement Jan. 07, 2021         Jan. 07, 2021  
Conversion of common stock into right to recieve per share 0.5165            
Common Stock Shares Issued   $ 5,400       $ 5,400