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Supplementary Oil And Gas Information (Unaudited) - Natural Gas Narrative (Details) - Natural Gas - Bcf	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reserve Quantities [Line Items]
Change in proved developed and undeveloped reserves, net (in MMbbl)	2,919	428	886
Extensions and discoveries (in MMbbl)	173	106	90
Improved recovery (in MMbbl)	159	202	414
Purchases of reserves in place (in MMbbl)	2,615	34	67
Sales of reserves in place (in Bcf)	4	0	3
Production (in Bcf)	524	528	542
Economic revisions due to prices (in Bcf)	100	248	(748)
Revisions of prior estimates (in Bcf)	399	367	(164)

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- Definition

Proved Developed And Undeveloped Reserves, Economic Revisions Due To Prices

+ References

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- Definition

Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
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-Subsection Instruction 2

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Changes in proved reserve estimates resulting from application of improved recovery techniques.

+ References

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- Definition

Volume increase (decrease) of proved reserves of oil and gas.

+ References

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

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Production of proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
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-Section Item 18
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Purchase of minerals in place.

+ References

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-Publisher SEC
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-Subsection Instruction 2

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
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Sales of minerals in place.

+ References

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-Publisher SEC
-Name Form 20-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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