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Asset retirement obligations - Summary of present value of estimated future net cash outflows (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Turkey |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 180.00%
Discount rate |  | 190.00%
Turkey | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 0.70% |
Discount rate | 0.70% |
Turkey | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.50% |
Discount rate | 1.50% |
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 90.00% | 180.00%
Discount rate | 90.00% | 190.00%
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 150.00% | 190.00%
Discount rate | 150.00% | 230.00%
Greece | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 0.40% | 1.70%
Discount rate | 0.40% | 1.70%
Greece | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.70% | 1.90%
Discount rate | 1.70% | 2.30%
Brazil |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 0.00% | 160.00%
Discount rate | 0.00% | 160.00%

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