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Contingencies, Commitments, and Accrued Environmental Costs - Narrative (Details) $ in Millions		1 Months Ended				9 Months Ended	12 Months Ended
	Aug. 02, 2019 USD ($)	Oct. 31, 2020	Mar. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2017 lawsuit	Dec. 31, 2023 USD ($)	Aug. 29, 2019 USD ($)
Loss Contingencies [Line Items]
Total environmental accrual included in balance sheet						$ 209		$ 184
Performance obligations secured by letters of credit						236
Several Louisiana Parishes and the State of Louisiana Against Oil and Gas Companies | ConocoPhillips Entities
Loss Contingencies [Line Items]
Loss contingency, new claims filed, number | lawsuit							22
Outer Continental Shelf Lease | Phillips Petroleum Company
Loss Contingencies [Line Items]
Ownership percentage in equity investment		25.00%
Sale of interest, duration		30 years
Venezuela | ConocoPhillips Versus Petroleos de Venezuela ICISD
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
Loss Contingencies [Line Items]
Litigation settlement, amount awarded from other party	$ 33			$ 500	$ 2,000
Litigation settlement, payment term				90 days
Proceeds from legal settlements						$ 786
Litigation settlement, amount awarded from other party, payment period				4 years 6 months
US and Canada | Cleanup Remediation Activities
Loss Contingencies [Line Items]
Environmental loss contingencies, term						30 years

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