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Acquisition and Divestitures (Schedule of Preliminary Allocation of the Total Purchase Price) (Details)
$ / shares in Units, $ in Millions
 9 Months Ended
Jan. 07, 2021
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
shares
Consideration:      
Conversion of common stock into right to recieve per share 0.5165 0.5165  
Common stock, shares issued (in shares) | shares   677,000,000 382,000,000
Total common equity consideration   $ 5,383  
Share-based replacement awards   49  
Total consideration   5,432  
Assets acquired:      
Cash, cash equivalents and restricted cash   344  
Accounts receivable   425  
Other current assets   49  
Right-of-use assets   38  
Proved oil and gas property and equipment   7,017  
Unproved and properties under development   2,362  
Other property and equipment   485  
Investments   400  
Other long-term assets   43  
Total assets acquired   11,163  
Liabilities assumed:      
Accounts payable   346  
Revenue and royalties payable   223  
Other current liabilities   454  
Debt   3,562  
Lease liabilities   38  
Asset retirement obligations   94  
Deferred income taxes   249  
Other long-term liabilities   765  
Total liabilities assumed   5,731  
Net assets acquired   $ 5,432  
WPX      
Consideration:      
WPX Common Stock outstanding | shares   561,200,000  
Devon and WPX Agreement [Member]      
Consideration:      
Conversion of common stock into right to recieve per share 0.5165    
Common stock, shares issued (in shares) | shares 290,000,000 289,900,000  
Devon closing price on January 7, 2021 | $ / shares   $ 18.57