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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2020 MBbls MMcf | Dec. 31, 2019 MBbls MMcf
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 4,381 | 6,404
Extensions, discoveries and improved recovery | 11 | 471
Revisions of previous estimates | (995) | (1,260)
Converted from undeveloped reserves | 25 | 7
Reserves sold | (29) | (5)
Reserve purchased | 24 | 6
Production | (733) | (1,242)
End of year | 2,684 | 4,381
Proved Undeveloped Reserves: |  |
Beginning of year | 1,833 | 10
Extensions, discoveries and improved recovery |  | 1,834
Revisions of previous estimates | (24) | (4)
Converted to developed reserves | (25) | (7)
End of year | 1,784 | 1,833
Total Proved Reserves at the End of the Year | 4,468 | 6,214
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 2,914 | 2,707
Extensions, discoveries and improved recovery | 7 | 264
Revisions of previous estimates | (239) | 506
Converted from undeveloped reserves | 5 | 7
Reserves sold | 0 | 0
Reserve purchased | 8 | 4
Production | (437) | (574)
End of year | 2,258 | 2,914
Proved Undeveloped Reserves: |  |
Beginning of year | 1,017 | 12
Extensions, discoveries and improved recovery |  | 1,013
Revisions of previous estimates | (224) | (1)
Converted to developed reserves | (5) | (7)
End of year | 787 | 1,017
Total Proved Reserves at the End of the Year | 3,045 | 3,931
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | MMcf | 19,995 | 21,065
Extensions, discoveries and improved recovery | MMcf | 36 | 1,330
Revisions of previous estimates | MMcf | (1,721) | 2,033
Converted from undeveloped reserves | MMcf | 66 | 65
Reserves sold | MMcf | (1,400) | (120)
Reserve purchased | MMcf | 38 | 19
Production | MMcf | (3,381) | (4,397)
End of year | MMcf | 13,633 | 19,995
Proved Undeveloped Reserves: |  |
Beginning of year | MMcf | 4,457 | 124
Extensions, discoveries and improved recovery | MMcf |  | 4,530
Revisions of previous estimates | MMcf | (584) | (42)
Converted to developed reserves | MMcf | (66) | (65)
End of year | MMcf | 3,897 | 4,457
Total Proved Reserves at the End of the Year | MMcf | 17,530 | 24,542

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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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