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Contingencies and Commitments - Textual (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 23 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2019 USD ($) | Jul. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2017 Lawsuits | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 29, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Total environmental accrual included in balance sheet |  |  |  |  |  | $ 177 |  |  | $ 171 |
Letters of Credit Outstanding, Amount |  |  |  |  |  | $ 240 |  |  |  |
Phillips Petroleum Company [Member] | Outer Continental Shelf Lease [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity investment |  |  |  |  |  | 25.00% |  |  |  |
Sale of interest, duration |  |  |  |  |  | 30 years |  |  |  |
The Louisiana Land and Exploration Company LLC [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  | $ 90 |  |  |  |  |  |  |  |
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 |  |  |
US and Canada [Member] | Cleanup Remediation Activities [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Terms |  |  |  |  |  | P30Y |  |  |  |
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 |  |  |  |  |  |  |  | $ 754 |  |

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