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Impairment Of Exploration And Evaluation And Oil And Gas Properties - Summary of Nominal Brent Oil Prices (Detail) - bbl |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021
2022 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 57 |  | 73
2023 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 62 | 87 | 71
2024 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 67 | 78 | 68
2025 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 72 | 74 | 69
2026 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 73 | 76 | 70
2027 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 75 | 77 | 72
2028 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil |  | 79 | 73

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