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Financial risk management objectives and policies - Sensitivity Analysis to Cash Flow Hedge (Details) - Cash Flow Hedge Risk
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Decrease in NG contract price 100000.00% 100000.00% 100000.00%
Effect on OCI before tax (-/+) 0.00% 39000000.00% 294000000.00%
Increase in NG contract price 100000.00% 100000.00% 100000.00%
Effect on OCI before tax (+/-) 0.00% (39000000.00%) (294000000.00%)