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Subordinated loans - Additional information (Details)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Apr. 30, 2023
EUR (€)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Feb. 28, 2023
EUR (€)
Feb. 28, 2023
GBP (£)
Feb. 28, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans       € 15,401 € 15,786        
Redemption of subordinated loans       90,574 82,844 € 76,150      
Interest expense on subordinated loans       708 648 € 571      
Fixed Rate Subordinated Tier 2 Notes (EUR)                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans             € 500    
Borrowings, interest rate             5.00% 5.00% 5.00%
Fixed Rate Subordinated Tier 2 Notes (GBP)                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans | £               £ 750  
Borrowings, interest rate             6.25% 6.25% 6.25%
Perpetual AT1 Contingent Convertible Capital Securities                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans | $                 $ 1,000
Borrowings, interest rate             7.50% 7.50% 7.50%
Subordinated Tier 2 Notes                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 5.80% 3.00% 4.70%            
Redemption of subordinated loans $ 810 € 1,000 $ 1,250            
Subordinated Loans                  
Disclosure of detailed information about borrowings [line items]                  
Interest expense on subordinated loans       € 708 € 648        
Subordinated Loans | Average                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       4.44% 4.01%