Name:	cop_InvestmentInEquitySecurityFairValue
Namespace Prefix:	cop_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Investment Shares Owned, Common Stock, percent of Issued and Outstanding

No definition available.

Name:	cop_InvestmentOwnedCommonStockPercentOfIssuedAndOutstanding
Namespace Prefix:	cop_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Shares exchanged for assets held for sale.

No definition available.

Name:	cop_SharesExchangeForAssetsHeldForSale
Namespace Prefix:	cop_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713

Name:	us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Price of a single share of a number of saleable stocks of a company.

No definition available.