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Risk management - Revaluation reserve equity securities at fair value through other comprehensive income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of equity [line items]    
Balance sheet value € 1,509 € 1,500
Revaluation reserve equity securities    
Disclosure of fair value measurement of equity [line items]    
Increase (decrease) in financial assets 34  
Financial assets (1,152) (1,187)
Revaluation reserve equity securities | Bank Of Beijing    
Disclosure of fair value measurement of equity [line items]    
Increase (decrease) in financial assets (24)  
Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Balance sheet value 1,885 1,887
Increase (decrease) in financial assets (2)  
Revaluation reserves: financial assets 1,152 1,187
Positive re-measurement | Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Revaluation reserves: financial assets 1,158 1,190
Negative re-measurement | Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Revaluation reserves: financial assets € (6) € (4)