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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
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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 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 + Details
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- Definition 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 + Details
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