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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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