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Acquisition and Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2022
USD ($)
MMBoe
Jul. 31, 2022
USD ($)
MMBoe
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / bbl
$ / MMBTU
Jun. 30, 2022
Dec. 31, 2022
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Common Stock Shares Issued         $ 64   $ 65
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 87            
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          
Other Current Assets [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments         30    
Other Noncurrent Assets [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments         35    
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         $ 130    
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.  
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]              
Contingent earnout payments     $ 4 $ 4