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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, 2024
Dec. 31, 2023
Disclosure of fair value measurement of equity [line items]    
Balance sheet value € 1,679 € 1,509
Revaluation reserve equity securities    
Disclosure of fair value measurement of equity [line items]    
Increase (decrease) in financial assets 1,816  
Financial assets (1,152) (664)
Revaluation reserve equity securities | Bank Of Beijing    
Disclosure of fair value measurement of equity [line items]    
Increase (decrease) in financial assets 652  
Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Balance sheet value 2,562 1,885
Increase (decrease) in financial assets (678)  
Revaluation reserves: financial assets 1,816 1,152
Positive re-measurement | Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Revaluation reserves: financial assets 1,820 1,158
Negative re-measurement | Equity securities at FVOCI    
Disclosure of fair value measurement of equity [line items]    
Revaluation reserves: financial assets € (4) € (6)