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Sales and Other Operating Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |  |  |
Accounts receivable, after allowance for credit loss | $ 5,701 | $ 5,701 | $ 5,268
Revenue recognized | $ 0 | $ 56 |

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- Definition Contract with Customer, Liability, Revenue Recognized, Including Opening Balance + References No definition available. + Details
Name: | cop_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance
Namespace Prefix: | cop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
Name: | us-gaap_AccountsReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration