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Impairment Of Exploration And Evaluation And Oil And Gas Properties - Summary of Nominal Brent Oil Prices (Parenthetical) (Detail) - bbl |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021
2022 Real Terms [member] | 2024 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil |  |  | 65
Prices of barrel per crude oil escalation percentage annually |  |  | 2.00%
2022 Real Terms [member] | 2025 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil |  | 70 |
Prices of barrel per crude oil escalation percentage annually |  | 2.00% |
2020 Real Terms [member] | 2024 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil |  | 65 |
2020 Real Terms [member] | 2025 [member] |  |  |
Disclosure nominal brent oil prices explanatory [line items] |  |  |
Nominal price per barrel of crude oil | 65 |  |
Prices of barrel per crude oil escalation percentage annually | 2.00% |  |

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