v3.26.1
Risk management - Additional information (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2028
Jun. 30, 2027
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]            
Unweighted ECL for all collective provisioned clients in upside scenario     € 2,914.0      
Unweighted ECL for all collective provisioned clients in baseline scenario     3,213.0      
Unweighted ECL for all collective provisioned clients in down scenario     3,975.0      
Economic sector / portfolio based adjustments     102.0 € 27.0    
Mortgage portfolio adjustments     70.0 121.0    
Climate transition risk     41.0 47.0    
Total ECL collective assessment     € 1,521.0 1,501.0    
Qualitative indicator, days arrears, backstop     30 days      
Upside scenario            
Disclosure of credit risk exposure [line items]            
Total ECL collective assessment for performing assets     € 1,163.0      
Change in average threshold ratio     (0.40%)      
Downside scenario            
Disclosure of credit risk exposure [line items]            
Total ECL collective assessment for performing assets     € 2,160.0      
Change in average threshold ratio     1.40%      
Australia            
Disclosure of credit risk exposure [line items]            
Mortgage portfolio adjustments     € 28.0      
Middle East            
Disclosure of credit risk exposure [line items]            
Economic sector / portfolio based adjustments     74.0      
Wholesale Banking            
Disclosure of credit risk exposure [line items]            
Climate transition risk     21.0      
Wholesale Banking | Middle East            
Disclosure of credit risk exposure [line items]            
Economic sector / portfolio based adjustments     54.0      
Retail banking            
Disclosure of credit risk exposure [line items]            
Climate transition risk     20.0      
Retail banking | Middle East            
Disclosure of credit risk exposure [line items]            
Economic sector / portfolio based adjustments     € 20.0      
Wholesale Banking and Retail Banking            
Disclosure of credit risk exposure [line items]            
Performing exposure, percentage     0.13      
Increase in performing exposure, percentage     0.24      
Eurozone            
Disclosure of credit risk exposure [line items]            
Economic growth rate     0.80%      
Poland            
Disclosure of credit risk exposure [line items]            
Economic growth rate     3.40%      
Turkey            
Disclosure of credit risk exposure [line items]            
Economic growth rate     3.00%      
Forecast            
Disclosure of credit risk exposure [line items]            
Global output percent 2.50% 2.40% 2.40%      
Forecast | UNITED STATES            
Disclosure of credit risk exposure [line items]            
Economic growth rate 2.10% 2.00% 2.10%      
Forecast | Eurozone            
Disclosure of credit risk exposure [line items]            
Economic growth rate 1.30% 1.20%        
Forecast | Poland            
Disclosure of credit risk exposure [line items]            
Economic growth rate 3.00% 3.20%        
Forecast | Turkey            
Disclosure of credit risk exposure [line items]            
Economic growth rate 3.60% 3.70%        
Gross carrying amount | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     € (1,209,939.0) (1,135,409.0)    
Gross carrying amount | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models        
Expected credit losses     € (1,209,939.0) (1,135,409.0)   € (1,048,574.0)
Gross carrying amount | Stage 1            
Disclosure of credit risk exposure [line items]            
Percentage of financial assets     91.70%   92.00%  
Gross carrying amount | Stage 1 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     € (1,109,717.0) (1,044,332.0)    
Gross carrying amount | Stage 1 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models        
Expected credit losses     € (1,109,717.0) € (1,044,332.0)   (954,943.0)
Gross carrying amount | Stage 2            
Disclosure of credit risk exposure [line items]            
Percentage of financial assets     7.10% 6.80%    
Changes in models     € 8,500.0      
Gross carrying amount | Stage 2 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     (86,015.0) € (77,487.0)    
Gross carrying amount | Stage 2 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models        
Expected credit losses     (86,015.0) (77,487.0)   (79,888.0)
Gross carrying amount | Stage 2 | Not credit-impaired | Loans | Lifetime expected credit losses            
Disclosure of credit risk exposure [line items]            
Increase (decrease) through net transfers, financial assets     19,500.0      
Increase (decrease) through net level three transfers, financial assets     1,500.0      
Gross carrying amount | Stage 2 | Loans            
Disclosure of credit risk exposure [line items]            
Expected credit losses     € (86,000.0) € (77,500.0)    
Gross carrying amount | Stage 3            
Disclosure of credit risk exposure [line items]            
Percentage of financial assets     1.20% 1.20%    
Gross carrying amount | Stage 3 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     € (14,207.0) € (13,590.0)    
Gross carrying amount | Stage 3 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models        
Expected credit losses     (14,207.0) (13,590.0)   (13,742.0)
Gross carrying amount | Stage 3 | Credit impaired | Loans            
Disclosure of credit risk exposure [line items]            
Decrease through derecognition and repayments financial assets     (1,100.0)      
Increase through write-offs and disposals, financial assets     700.0      
Gross carrying amount | Stage 3 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models     600.0      
Expected credit losses     (13,600.0) (14,200.0)    
Gross carrying amount | Stage 3 | Loans | Credit impaired | Of which: non-performing            
Disclosure of credit risk exposure [line items]            
Changes in models     2,500.0      
Provisions            
Disclosure of credit risk exposure [line items]            
Expected credit losses     6,214.0      
Provisions | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     6,214.0 6,101.0    
Provisions | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models     7.0 (3.0)    
Expected credit losses     6,214.0 6,101.0   6,049.0
Provisions | Stage 1 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     462.0 446.0    
Provisions | Stage 1 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models     14.0 33.0    
Expected credit losses     462.0 446.0   409.0
Provisions | Stage 2 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     1,184.0 1,179.0    
Provisions | Stage 2 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models     3.0 (71.0)    
Expected credit losses     1,184.0 1,179.0   1,130.0
Increase (decrease) due to sales and repayments, financial assets     9,500.0      
Increase (decrease) through net level two transfers, financial assets     (5.3)      
Provisions | Stage 3 | IFRS 9            
Disclosure of credit risk exposure [line items]            
Expected credit losses     4,568.0 4,476.0    
Provisions | Stage 3 | Loans            
Disclosure of credit risk exposure [line items]            
Changes in models     (10.0) 35.0    
Expected credit losses     4,568.0 € 4,476.0   € 4,509.0
Financial assets, increase (decrease) in provisions     € (92.0)