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Basis of preparation and material accounting policy information - Additional information (Details)
€ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2024
EUR (€)
Dec. 31, 2024
EUR (€)
segment
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Disclosure of material accounting policies [line items]        
Reconciliation net result effect of adjustment after tax EU IAS 39 carve-out   € (1,058) € (3,147) € 8,451
Number of reportable segments | segment   5    
Level of price index   2,684.55 1,859.38 1,128.45
Price index movements   0.4438 0.6477 0.6427
TLTRO        
Disclosure of material accounting policies [line items]        
Repayment of deposits from banks € 6,000      
Minimum | Property        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   20 years    
Minimum | - Data processing equipment        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   2 years    
Minimum | Fixtures and fittings        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   4 years    
Maximum | Software and other intangible assets        
Disclosure of material accounting policies [line items]        
Useful life, intangible assets   5 years    
Maximum | Property        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   50 years    
Maximum | - Data processing equipment        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   5 years    
Maximum | Fixtures and fittings        
Disclosure of material accounting policies [line items]        
Useful life, property and equipment   10 years