Supplemental Disclosure of Oil and Natural Gas Operations (Unaudited) - Additional Information (Details) - MBoe	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve Quantities [Line Items]
Extensions and discoveries	138,750	159,778	160,340
Revisions of previous estimates	14,291	(2,283)	(9,205)
Revision of previous estimates due to ASC 606		11,434
Revision of previous estimates, removal of reserve locations	(23,686)	12,214
Reclassification of proved undeveloped reserves to unproved reserves			(4,725)
Revision of previous estimates, better than expected performance	11,498	3,063	8,134
Revision of estimates, increase (decrease) due to oil prices	2,103		(2,752)
Revision of previous estimates, production			3,044
Purchases of reserves in place	554	5,613	55,814
Divestures of reserves in place	3,076	22,465	6,467
Midland Basin
Reserve Quantities [Line Items]
Purchases of reserves in place	554	5,550	53,105
Divestures of reserves in place	3,076	22,372	5,936
Delaware Basin
Reserve Quantities [Line Items]
Purchases of reserves in place		63	2,709
Divestures of reserves in place		93	531

Proved Developed and Undeveloped Reserve, Revision of Previous Estimate, ASC 606 Revenue Recognition (Energy)

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Proved Developed and Undeveloped Reserve, Revision of Previous Estimate, Downward Adjustment Due To Removal Of Undeveloped Drilling Locations (Energy)

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No definition available.

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Proved Developed and Undeveloped Reserve, Revision of Previous Estimate, Reclassification Of Reserves (Energy)

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Proved Developed and Undeveloped Reserve, Revision of Previous Estimate, Upward (Downward) Adjustment Due To Crude Oil Prices (Energy)

+ References

No definition available.

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Proved Developed and Undeveloped Reserve, Revision of Previous Estimate, Upward (Downward) Adjustment Due To Production (Energy)

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No definition available.

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- Definition

Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
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Energy measure of increase in quantity of proved reserve of oil and gas resulting from application of improved recovery techniques, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (b)
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Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (c)
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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (f)
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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.

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