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Acquisitions and Divestitures (Narrative) (Details)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 27, 2024
USD ($)
shares
Sep. 30, 2022
USD ($)
MMBoe
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
$ / bbl
$ / MMBTU
shares
Dec. 31, 2023
USD ($)
MMBoe
shares
Dec. 31, 2022
USD ($)
MMBoe
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                
Devon common stock issued | shares           651.0 636.0  
Common Stock Shares Issued           $ 65 $ 64  
Total estimated proved reserves | MMBoe             1 3
Contingent earnout payments           20    
Total revenues           15,940 $ 15,258 $ 19,169
Net earnings           2,942 $ 3,782 $ 6,037
Barnett Shale [Member]                
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                
Contingent earnout payments     $ 20 $ 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 had a term of four years.    
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      
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]                
Total consideration for business acquired $ 5,000              
Cash paid related to acquisition $ 3,500              
Cash consideration   $ 830            
Williston Acquisition [Member] | Common Stock [Member]                
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                
Devon common stock issued | shares 37.3              
GME Revenues and Earnings [Member]                
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]                
Total revenues           $ 687    
Net earnings           $ 122    
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