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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Extractive Industries [Abstract] |  |  |  |  |
Future cash inflows |  | $ 69,403,611 | $ 35,820,758 |  |
Future costs: |  |  |  |  |
Production |  | (27,015,321) | (23,281,268) |  |
Development | [1] | (2,469,028) | (2,744,539) |  |
Future net cash flows before income taxes |  | 39,919,262 | 9,794,951 |  |
Future income tax expense |  | 8,146,832 | (1,240,011) |  |
Total future net cash flows before 10% discount |  | 31,772,430 | 8,554,940 |  |
10% annual discount |  | (19,287,204) | (5,708,618) |  |
Standardized measure of discounted future net cash flows |  | $ 12,485,226 | $ 2,846,322 | $ 6,628,573 | $ 11,115,594
[1] | ncludes $308.5 million of undiscounted future asset retirement costs as of December 31, 2021, using current estimates of future abandonment costs.

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and 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 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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