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Acquisition and Divestitures (Narrative) (Details)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
$ / MMBTU
$ / bbl
shares
Dec. 31, 2023
shares
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]        
Potential additional contingent earnout payment     $ 65  
Common stock, shares issued (in shares) | shares     628 636
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  
Barnett Shale [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]        
Contingent earnout payments   $ 65 $ 20  
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.  
Williston Acquisition [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]        
Cash paid related to acquisition $ 3,250      
Williston Acquisition [Member] | Common Stock [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]        
Common stock, shares issued (in shares) | shares 37      
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