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Income Taxes - Reconciliation of Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Asset Valuation Allowance [Roll Forward]
Beginning balance	$ 7,656	$ 8,049	$ 8,342
Charged to expense (benefit)	(409)	(2)	5
Other	(812)	(391)	(298)
Ending balance	$ 6,435	$ 7,656	$ 8,049

X

- Definition

Deferred Tax Asset Valuation Allowance

+ References

No definition available.

+ Details

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Namespace Prefix:	cop_
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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cop_Deferredtaxassetsvaluationallowanceother
Namespace Prefix:	cop_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance, Charged To Expense

+ References

No definition available.

+ Details

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Namespace Prefix:	cop_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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