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Acquisitions and Divestitures (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 48 Months Ended
Sep. 30, 2022
USD ($)
Jan. 07, 2021
Jul. 31, 2022
USD ($)
MMBoe
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
$ / MMBTU
$ / bbl
Dec. 31, 2022
USD ($)
MMBoe
Dec. 31, 2021
USD ($)
Boe
MMBoe
Dec. 31, 2020
USD ($)
MMBoe
Dec. 31, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Conversion of common stock into right to received per share   0.5165                
Common Stock Shares Issued             $ 65 $ 66    
Gain on asset dispositions                 $ (1)  
Total estimated proved reserves | MMBoe             3 7 2  
Gain on asset dispositions             $ 44 $ 168 $ 1  
Gain loss on disposition of assets             44 168 $ 1  
Barnett Shale [Member]                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Divestitures of property and equipment           $ 490        
Gain on asset dispositions             42 110    
Contingent earnout payments         $ 65   130      
Divestitures of property and equipment           $ 490        
Gain on asset dispositions             42 110    
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU           2.75        
WTI oil price for contingent earnout payment upside | $ / bbl           50        
Gain loss on disposition of assets             42 110    
Additional contingent earnout payment           $ 130        
Barnett Shale [Member] | Subsequent Event                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Contingent earnout payments       $ 65            
Barnett Shale [Member] | Scenario Forecast [Member]                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Contingent earnout payment period                   The contingent payment period commenced on January 1, 2021 and has a term of four years.
Other Current Assets | Barnett Shale [Member]                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Contingent earnout payments             65      
Other Noncurrent Assets | Barnett Shale [Member]                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Contingent earnout payments             $ 88      
Non Core Assets                    
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    
Total estimated proved reserves | Boe               3    
Contingent earnout payments         $ 4          
Divestitures of property and equipment               $ 9    
Non Core Assets | Subsequent Event                    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                    
Contingent earnout payments       $ 4            
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 received per share   0.5165                
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