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Contingent liabilities and commitments - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of contingent liabilities [line items]    
Contingent liabilities and commitments € 209,828 € 206,820
Contingent liabilities 42,821 44,544
Financial assets pledged 106,052 126,682
Deposit Guarantee Scheme    
Disclosure of contingent liabilities [line items]    
Financial assets pledged   259
Voya Financial Inc    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and commitments 205 344
Contingent liabilities in respect of guarantees    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 27,894 28,859
Contingent liabilities in respect of guarantees | Voya Financial Inc    
Disclosure of contingent liabilities [line items]    
Debenture loans 0  
Irrevocable payment commitments | Single Resolution Fund    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 346 283
Additions to contingent liabilities 63 57
Irrevocable payment commitments | Deposit Guarantee Scheme    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 273 237
Additions to contingent liabilities 36 € 31
Financial assets pledged € 319