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Risk management - Macroeconomic scenarios applied - Additional Information (Details)
 12 Months Ended 24 Months Ended 36 Months Ended
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%