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Risk management - Macroeconomic scenarios applied - Additional Information (Details) | 12 Months Ended | 24 Months Ended | 36 Months Ended
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Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2026 | Dec. 31, 2026
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Global output percent |  |  |  | 2.40% | 2.60% |  |
Global GDP increase |  |  |  | 2.40% |  |  |
Global GDP rate assumed |  |  |  | 1.30% |  |  |
USA |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 2.20% |  |  |
Eurozone |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 0.50% |  |  |
Poland |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 0.40% |  |  |
Türkiye |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 3.50% |  |  |
Unemployment rate |  |  |  | 10.00% |  |  |
Russia |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 1.70% |  |  |
Australia |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  | 1.70% |  |  |
Unemployment rate |  |  |  | 4.10% |  |  |
Forecast |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Global output percent | 2.40% | 2.30% | 1.80% |  |  |  |
Global GDP increase |  |  | 1.80% |  |  |  |
Global GDP rate assumed |  |  | 2.40% |  |  |  |
Forecast | USA |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate | 3.30% |  | 0.90% |  |  | 2.00% |
Forecast | Eurozone |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  | 0.80% |  |  | 1.40% |
Forecast | Poland |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  | 2.50% |  |  |  |
Forecast | Türkiye |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  | 2.10% |  |  |  |
Forecast | Russia |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  |  |  |  | 1.20%
Forecast | China |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate |  |  |  |  |  |  | 4.20%
Forecast | Australia |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Economic growth rate | 2.50% | 2.40% | 1.30% |  |  |  |
Unemployment rate |  |  | 4.40% |  |  |  |

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