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Financial risk management objectives and policies - Sensitivity Analysis to Cash Flow Hedge (Details) - Cash Flow Hedge Risk | 12 Months Ended
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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%)

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