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Acquisitions and Dispositions - Schedule of Business Combination (Details) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Jan. 15, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2022 shares	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Business Acquisition [Line Items]
Number of shares of Concho stock awards outstanding (in shares)			11,973,783	4,303,575
Number of shares of Concho common stock issued (in shares)			2,091,562,747	2,100,885,134	1,798,844,267	1,795,652,203
Concho Resources Incorporated
Business Acquisition [Line Items]
Exchange ratio	1.46	1.46
Average price per share of ConocoPhillips common stock (in dollars per share) | $ / shares	$ 45.9025
Total consideration | $	$ 13,100	$ 13,100	$ 13,125
Concho Resources Incorporated | Common Stock
Business Acquisition [Line Items]
Additional shares of ConocoPhillips common stock issued as consideration (in shares)			285,929,000
Concho Resources Inc. | Concho Resources Incorporated
Business Acquisition [Line Items]
Number of shares of common stock outstanding (in shares)	194,243,000
Number of shares of Concho stock awards outstanding (in shares)	1,599,000
Number of shares exchanged (in shares)	195,842,000
Number of shares of Concho common stock issued (in shares)	194,243,000

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