v3.21.2
Acquisitions and Dispositions - Total Consideration (Details)
$ / shares in Units, $ in Millions
Jan. 15, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
shares
Dec. 31, 2020
shares
Total Consideration      
Number of shares of common stock issued   2,089,046,718 1,798,844,267
Concho Resources Incorporated [Member]      
Total Consideration      
Exchange ratio 1.46    
Total Consideration | $ $ 13,125    
Concho Resources Incorporated [Member] | Common Stock [Member]      
Total Consideration      
Additional shares of ConocoPhillips common stock issued as consideration 285,929,000    
Concho Resources Incorporated [Member] | Arithmetic Average [Member]      
Total Consideration      
Average price per share of ConocoPhillips common stock | $ / shares $ 45.9025    
Concho Resources Incorporated [Member] | Concho Resources Inc. [Member]      
Total Consideration      
Number of shares of common stock issued 194,243,000    
Number of shares of common stock outstanding 194,243,000    
Number of shares of stock awards outstanding 1,599,000    
Number of shares exchanged 195,842,000