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Acquisitions and Divestitures (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
MMBoe
Mar. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
MMBoe
$ / MMBTU
$ / bbl
Dec. 31, 2022
USD ($)
MMBoe
Dec. 31, 2021
MMBoe
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Common Stock Shares Issued         $ 64 $ 65  
Total estimated proved reserves | MMBoe         1 3 7
Potential additional contingent earnout payment         $ 65    
Barnett Shale [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments   $ 65   $ 65      
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU         2.75    
WTI oil price for contingent earnout payment upside | $ / bbl         50    
Barnett Shale [Member] | Subsequent Event              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Additional contingent earnout payment $ 20            
Other Current Assets              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments         $ 20    
Other Noncurrent Assets              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments         35    
Non Core Assets              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Contingent earnout payments   $ 4   $ 4      
Proceeds from sale of business         9    
Gain related to sale of assets         $ 35    
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    
Conversion of common stock into right to received per share         0.00005165    
Common Stock Shares Issued         $ 5,400    
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        
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 [Member]              
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]              
Total estimated proved reserves | MMBoe     66