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Asset retirement obligations - Summary of present value of estimated future net cash outflows (Details)
Dec. 31, 2021
Dec. 31, 2020
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%