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Contingent liabilities and commitments - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of contingent liabilities [line items]    
Contingent liabilities and commitments € 218,728 € 209,828
Contingent liabilities 43,296 42,821
Financial assets pledged 105,944 106,052
Deposit Guarantee Scheme    
Disclosure of contingent liabilities [line items]    
Financial assets pledged   319
Voya Financial Inc    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and commitments 219 205
Contingent liabilities in respect of guarantees    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 26,908 27,894
Contingent liabilities in respect of guarantees | Voya Financial Inc    
Disclosure of contingent liabilities [line items]    
Debenture loans 0 0
Irrevocable payment commitments | Single Resolution Fund    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 346 346
Additions to contingent liabilities 0 63
Called from contingent liabilities 0 0
Irrevocable payment commitments | Deposit Guarantee Scheme    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 309 273
Additions to contingent liabilities 35 36
Called from contingent liabilities 0 € 0
Financial assets pledged € 336