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Suspended Wells and Wells in Progress (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Suspended Wells [Abstract]
Capitalized cost of suspended wells	$ 1,001	$ 856
Increase (decrease) in capitalized cost of suspended wells	$ 145
Number of wells charged to dry hole expense	No

X

- Definition

Number of wells charged to dry hole expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	cop_
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Balance Type:	na
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X

- References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in capitalized exploratory well costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

+ Details

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X

- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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