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Financial assets at fair value through other comprehensive income- Summary of equity securities designated as at fair value through other comprehensive income (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Carrying value € 2,364   € 1,885
Dividend income 8 € 2  
Investment in Bank of Beijing      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Carrying value 2,066   1,590
Dividend income  
Other Investments      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Carrying value 298   € 295
Dividend income € 8 € 2