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Costs and expenses by nature - Tax on mineral production (Details) - bbl | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021
Disclosure of operating segments [line items] |  |
Increase in state decree rate per metric ton | 11.19 |
Until the production of 10 million metric tons |  |
Disclosure of operating segments [line items] |  |
Rates per metric ton |  | 3.72
Over the production of 10 million metric tons |  |
Disclosure of operating segments [line items] |  |
Rates per metric ton | 0.74 |
Minimum |  |
Disclosure of operating segments [line items] |  |
Rates per metric ton |  | 0.50
Maximum |  |
Disclosure of operating segments [line items] |  |
Rates per metric ton |  | 3.72

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