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Supplementary Information - Condensed Consolidating Financial Information (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Collection of advances/loans-related parties		$ 62	$ 59
ConocoPhillips - [Member]
Condensed Financial Statements, Captions [Line Items]
Collection of advances/loans-related parties	$ 1,700
ConocoPhillips Company [Member]
Condensed Financial Statements, Captions [Line Items]
Collection of advances/loans-related parties	$ 3,300
ConocoPhillips Company [Member] | ConocoPhillips - [Member]
Condensed Financial Statements, Captions [Line Items]
Ownership Percentage by Parent		100.00%
Burlington Resources L L C [Member] | ConocoPhillips Company [Member]
Condensed Financial Statements, Captions [Line Items]
Ownership Percentage by Parent		100.00%

X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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X

- Definition

The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Details

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