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Contingencies and Commitments (Narrative) (Details) $ in Millions		1 Months Ended			12 Months Ended
	Aug. 02, 2019 USD ($)	Mar. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2017 Lawsuits	May 10, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 29, 2019 USD ($)
Loss Contingencies [Line Items]
2022					$ 7
2023					7
2024					7
2025					7
2026					7
2027 and after					43
Total payments under agreement					27			$ 25	$ 25
Barossa Project [Member] \| Asia Pacific Operating Segment [Member] \| Operating Segments [Member]
Loss Contingencies [Line Items]
Receivable in dispute							$ 200	$ 200
Performance Obligation [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount					$ 337
Several Louisiana parishes and the State of Louisiana against oil and gas companies [Member]
Loss Contingencies [Line Items]
Loss Contingency, New Claims Filed, Number \| Lawsuits						43
Several Louisiana parishes and the State of Louisiana against oil and gas companies [Member] \| ConocoPhillips Entities [Member]
Loss Contingencies [Line Items]
Loss Contingency, New Claims Filed, Number \| Lawsuits						22
Outer Continental Shelf Lease [Member] \| Phillips Petroleum Company [Member]
Loss Contingencies [Line Items]
Ownership percentage in equity investment					25.00%
Sale of interest, duration					30 years
Venezuela \| ConocoPhillips Versus Petroleos de Venezuela ICISD [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 8,700
Litigation Award Reduction										$ 227
Litigation Settlement Amount Awarded From Other Party Revised					$ 8,500
Venezuela \| ConocoPhillips vs Petroleos De Venezuela ICC [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 33		$ 500	$ 2,000
Loss Contingency, Settlement Agreement, Terms					In August 2018, ConocoPhillips entered into a settlement with PDVSA to recover the full amount of this ICC award, plus interest through the payment period, including initial payments totaling approximately $500 million within a period of 90 days from the time of signing of the settlement agreement. The balance of the settlement is to be paid quarterly over a period of four and a half years.
Cash Proceeds from Legal Settlements					$ 768