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Risk management - Macroeconomic scenarios applied - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of credit risk exposure [line items] |  |  |  |  |
Global output percent |  |  |  | 2.50% |
Global GDP increase |  |  |  | 2.50% |
Global GDP rate assumed |  |  |  | 2.40% |
USA |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 2.00% | 2.70%
Eurozone |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 0.80% |
Poland |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 2.70% |
Türkiye |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 3.10% |
Russia |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 3.70% |
China |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 4.80% |
Australia |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  |  |  | 1.20% |
Forecast |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Global output percent | 2.30% | 2.40% | 2.40% |  |
Global GDP increase |  |  | 2.40% |  |
Global GDP rate assumed |  |  | 2.30% |  |
Forecast | Eurozone |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 1.20% | 1.00% |  |
Forecast | Poland |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 3.80% | 3.50% |  |
Forecast | Türkiye |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 3.50% | 2.60% |  |
Forecast | Russia |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 1.30% | 1.60% |  |
Forecast | China |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 4.10% | 4.40% |  |
Forecast | Australia |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Economic growth rate |  | 2.40% | 2.00% |  |

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