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Asset retirement obligations - Summary of present value of estimated future net cash outflows (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Turkey | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.30% | 0.70%
Discount rate | 1.30% | 0.70%
Turkey | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.90% | 1.50%
Discount rate | 1.90% | 1.50%
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 150.00% | 90.00%
Discount rate | 150.00% | 90.00%
Greece | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 0.70% | 40.00%
Discount rate | 0.70% | 40.00%
Greece | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.90% | 170.00%
Discount rate | 1.90% | 170.00%
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 190.00% | 150.00%
Discount rate | 190.00% | 150.00%

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