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v3.20.1

Asset retirement obligations - Summary of Present Value of Estimated Future Net Cash Outflows (Details) | Dec. 31, 2019 | Dec. 31, 2018
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Turkey |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.80% |
Discount rate | 1.90% | 2.70%
Turkey | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.20%
Turkey | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.30%
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.80% |
Discount rate | 1.90% | 2.70%
Canada | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.20%
Canada | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.30%
Greece | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.70% | 2.20%
Discount rate | 1.70% | 2.50%
Greece | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.90% | 2.30%
Discount rate | 2.30% | 2.90%
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.90% |
Discount rate | 2.30% | 2.90%
Romania | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.20%
Romania | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.30%
Brazil |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate | 1.60% |
Discount rate | 1.60% | 2.60%
Brazil | Bottom of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.20%
Brazil | Top of range |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Inflation rate |  | 2.30%

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