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Related Party Transactions (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Significant transactions with related parties |  |  |  |
Related Party Revenue | $ 27,000,000 | $ 24,000,000 | $ 74,000,000 | $ 83,000,000
Related Party Purchases | 25,000,000 | 26,000,000 | 74,000,000 | 74,000,000
Operating expenses and selling, general and administrative expenses | 13,000,000 | 16,000,000 | 44,000,000 | 42,000,000
Net interest income | $ (4,000,000) | $ (4,000,000) | $ (11,000,000) | $ (10,000,000)

X
- Definition Related party transaction. + References No definition available. + Details
Name: | cop_RelatedPartyTransactionAbstract
Namespace Prefix: | cop_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from related parties. + References No definition available. + Details
Name: | cop_RelatedPartyTransactionsRelatedPartyRevenue
Namespace Prefix: | cop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest income earned from interest-bearing assets owed to the entity by related party. + References No definition available. + Details
Name: | us-gaap_InterestIncomeRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration