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Supplementary Oil And Gas Information (Unaudited) - Oil and Natural Gas Liquids Narrative (Details) - Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids - MMBbls	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reserve Quantities [Line Items]
Change in proved developed and undeveloped reserves, net (in MMbbl)	(860)	1,400	625
Extensions and discoveries (in MMbbl)	115	726	364
Improved recovery (in MMbbl)	33	58	181
Purchases of reserves in place (in MMbbl)	52	28	668
Sales of reserves in place (in MMbbl)	0	0	0
Production (in MMbbl)	309	320	285
Economic revisions due to prices (in MMbbl)	(1,118)	805	(285)
Revisions of prior estimates (in MMbbl)	368	103	(19)

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- Definition

Proved Developed And Undeveloped Reserves, Economic Revisions Due To Prices

+ References

No definition available.

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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
-Section Item 18
-Subsection Instruction 2

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- Definition

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

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-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

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- Definition

Production of proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

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Purchase of minerals in place.

+ References

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-Publisher SEC
-Name Form 20-F
-Section Item 18
-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
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

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Sales of minerals in place.

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-Section Item 18
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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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