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Acquisition and Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
MMBoe
Jul. 31, 2022
USD ($)
MMBoe
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / MMBTU
$ / bbl
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         $ 20
Other Noncurrent Assets [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]          
Contingent earnout payments         45
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