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Debt securities - Summary of securities at amortised costs (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets € 98,864 € 87,703  
Debt securities at fair value through other comprehensive income      
Disclosure Of Financial Assets [Line Items]      
Financial assets 41,116 31,625 € 30,635
Debt securities at fair value through other comprehensive income | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 38,281 29,095  
Debt securities at amortised cost | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 48,313 48,160  
Debt securities at fair value through other comprehensive income and amortised cost | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 86,594 77,255  
Trading assets | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 6,907 4,189  
Debt securities at fair value through profit or loss | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 5,363 6,258  
Total debt securities at fair value through profit or loss | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets € 12,270 € 10,447