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Acquisition and Divestitures (Narrative) (Details)
$ in Millions, $ in Billions
 3 Months Ended 12 Months Ended 48 Months Ended
Jan. 07, 2021
shares
Oct. 01, 2020
USD ($)
$ / MMBTU
$ / bbl
Mar. 30, 2022
USD ($)
Mar. 31, 2021
USD ($)
MMBoe
Jun. 30, 2020
USD ($)
Jun. 30, 2020
CAD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
CAD ($)
Dec. 31, 2021
USD ($)
MMBoe
Dec. 31, 2020
USD ($)
MMBoe
Dec. 31, 2019
USD ($)
MMBoe
Dec. 31, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                        
Common Stock Shares Issued                 $ 66 $ 38    
Gain on asset dispositions                   $ (1) $ 222  
Total estimated proved reserves | MMBoe [1]                 7 2 54  
Gain on asset dispositions                 $ 168 $ 1 $ 48  
Gain loss on disposition of assets                 168 $ 1 48  
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                 110      
Contingent earnout payments   65                    
Divestitures of property and equipment   $ 490                    
Gain on asset dispositions                 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                 110      
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.
Canadian Business Segment [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                        
Gain on asset dispositions             $ 223          
Proceeds from sale of business             2,600 $ 3.4        
Gain recognized on sale of business, net of tax             $ 425          
Canadian Business Segment [Member] | Canadian Natural Resources Limited [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                        
Gain on asset dispositions                     223  
Proceeds from sale of business         $ 2,600 $ 3.4            
Gain recognized on sale of business, net of tax                     425  
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                 $ 111      
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             $ 390  
Gain on asset dispositions       $ 35                
Total estimated proved reserves | MMBoe       3             54  
Contingent earnout payments     $ 4                  
Change in contingent earnout payments     $ 4                  
Divestitures of property and equipment       $ 9             $ 390  
Gain on asset dispositions                     48  
Gain loss on disposition of assets                     $ 48  
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      
Per share conversion | shares 0.5165                      
Common Stock Shares Issued                 $ 5,400      
[1] Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.