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Discontinued Operations (Narrative) (Details)
$ in Millions, $ in Billions
 3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Feb. 02, 2022
USD ($)
Oct. 01, 2020
USD ($)
$ / MMBTU
$ / bbl
Dec. 17, 2019
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
CAD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2024
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Asset impairments                 $ 182 $ 785  
Gain on asset dispositions                 (1) 222  
Gain recognized on sale of business, pre-tax                 (1) 222  
Foreign currency translation adjustment [1]                   1,237  
Charge on early retirement of debt, cash retirement costs               $ 59      
Senior Notes [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Charge on early retirement of debt, cash retirement costs               89      
Barnett Shale [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Asset impairments                 182 $ 748  
Goodwill                 $ 88    
Divestitures of property and equipment   $ 490                  
Contingent earnout payments   $ 65                  
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU   2.75                  
WTI oil price for contingent earnout payment upside | $ / bbl   50                  
Gain on asset dispositions               110      
Gain recognized on sale of business, pre-tax               110      
Barnett Shale [Member] | Subsequent Event                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Contingent earnout payments $ 195                    
Contingent earnout payments received $ 65                    
Barnett Shale [Member] | Other Current Assets                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Contingent earnout payments               65      
Contingent payments valuation               65      
Barnett Shale [Member] | Other Noncurrent Assets                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Contingent earnout payments               111      
Contingent payments valuation               $ 111      
Barnett Shale [Member] | Scenario Forecast [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Contingent earnout payment period                     The contingent payment period commenced on January 1, 2021 and has a term of four years.
Barnett Shale [Member] | BKV [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Percentage of estimated U.S. total proved reserves associated with divestiture assets     45.00%                
Divestitures of property and equipment   $ 490                  
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.      
Barnett Shale [Member] | BKV [Member] | Scenario Forecast [Member] | Maximum [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Contingent earnout payments                     $ 260
Canadian Business Segment [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Gain on asset dispositions         $ 223            
Proceeds from the sale of business         2,600 $ 3.4          
Gain recognized on sale of business, pre-tax         223            
Gain recognized on sale of business, after-tax         425            
Income taxes paid             $ 175        
Foreign currency translation adjustment         $ 1,200            
Charge on early retirement of debt, cash retirement costs       $ 52              
Loss on early retirement of debt, noncash charges       6              
Canadian Business Segment [Member] | 4.00% due July 15, 2021 [Member] | Senior Notes [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Long-term debt retired       $ 500              
Debt interest rate, stated percentage       4.00%              
Debt, maturity date       Jul. 15, 2021              
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member]                      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                      
Long-term debt retired       $ 1,000              
Debt interest rate, stated percentage       3.25%              
Debt, maturity date       May 15, 2022              
[1] In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.