Acquisitions and Dispositions - Total Consideration (Details) $ / shares in Units, $ in Millions |
Jan. 15, 2021
USD ($)
$ / shares
shares
|
Mar. 31, 2021
shares
|
Dec. 31, 2020
shares
|
|---|---|---|---|
| Total Consideration | |||
| Number of shares of Concho common stock issued | 2,087,207,067 | 1,798,844,267 | |
| Concho Resources Inc [Member] | |||
| Total Consideration | |||
| Exchange ratio | 1.46 | ||
| Total Consideration | $ | $ 13,125 | ||
| Concho Resources Inc [Member] | Common Stock [Member] | |||
| Total Consideration | |||
| Additional shares of ConocoPhillips common stock issued as consideration | 285,929,000 | ||
| Concho Resources Inc [Member] | Arithmetic Average [Member] | |||
| Total Consideration | |||
| Average price per share of ConocoPhillips common stock | $ / shares | $ 45.9025 | ||
| Concho Resources Inc [Member] | Concho Resources Inc [Member] | |||
| Total Consideration | |||
| Number of shares of Concho common stock issued | 194,243,000 | ||
| Number of shares of Concho common stock outstanding | 194,243,000 | ||
| Number of shares of Concho stock awards outstanding | 1,599,000 | ||
| Shares Outstanding | 195,842,000 |