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Capital management - Additional information (Details) - EUR (€)
€ / shares in Units, € in Millions, shares in Millions
 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2024
Aug. 14, 2023
Aug. 31, 2023
May 31, 2023
Aug. 31, 2022
May 31, 2022
Oct. 31, 2021
Feb. 05, 2024
Oct. 13, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2023
Disclosure Of Capital Management [Line Items]                            
Hyperinflationary accounting, net profit (loss)                     € 234      
Dividend per ordinary share paid (in eur per share)   € 0.350 € 0.350 € 0.389 € 0.170 € 0.410 € 0.210              
Proposed cash dividend, per ordinary share (in eur per share)                     € 0.756      
Dividends recognised as distributions to owners                 € 1,500   € 2,668 € 2,178 € 1,288  
Share buyback programme (in shares)                 121.3          
Purchase of treasury shares                 € 1,566   € 4,000 € 1,582 € 1,744  
Major ordinary share transactions                            
Disclosure Of Capital Management [Line Items]                            
Dividends recognised as distributions to owners               € 2,500            
Share buyback programme (in shares)               194.8            
Purchase of treasury shares               € 2,508            
Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
CET1, ambition                     12.50%      
Maximum Distributable Amount trigger level percentage                     10.98%      
Maximum distributable amount, management basis points buffer                     1.50%      
Common equity Tier 1 ratio                     14.70%      
Tier 1 ratio - including grandfathered securities                     16.90%      
Decrease in Fully- loaded common equity Tier 1 ratio                     19.80% 19.40%    
Dividend pay-out ratio                     50.00%      
Resilient net profit                     € 7,520      
Resilient net profit reserved for distribution outside CET1 capital reflicecting distribution policy                     € 3,760      
Proposed cash dividend, per ordinary share (in eur per share)                     € 0.756      
Transitional (phased-in) common equity Tier 1 required                   10.98%        
Common equity Tier 1 required                   10.98%        
Tier 1 minimum requirements                     6.00%      
Total capital ratio required                     8.00%      
MDA Trigger, CET1                   10.98%        
MDA Trigger, Tier 1 Capital                   12.81%        
MDA Trigger, total capital                   15.25%        
Total Pillar II Requirement Percent                     1.75%      
MDA Requirement On Leverage Ratio                           3.50%
Increase (decrease) due to departure from requirement of IFRS | Change in MDA requirements                            
Disclosure Of Capital Management [Line Items]                            
Total Pillar II Requirement Percent 1.65%                          
Results IFRS-EU                            
Disclosure Of Capital Management [Line Items]                            
Resilient net profit                     € 7,287      
Pillar 1 requirement | Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
Transitional (phased-in) common equity Tier 1 required                     4.50%      
Common equity Tier 1 required                     4.50%      
Pillar 2 requirement | Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
Transitional (phased-in) common equity Tier 1 required                     0.98%      
Common equity Tier 1 required                     0.98%      
Capital Conservation Buffer | Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
Transitional (phased-in) common equity Tier 1 required                     2.50%      
Common equity Tier 1 required                     2.50%      
Countercyclical Buffer | Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
Transitional (phased-in) common equity Tier 1 required                     0.50%      
Common equity Tier 1 required                     0.50%      
O-SII | Increase (decrease) due to departure from requirement of IFRS                            
Disclosure Of Capital Management [Line Items]                            
Transitional (phased-in) common equity Tier 1 required                     2.50%      
Common equity Tier 1 required                     2.50%