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Contingent liabilities and commitments - Summary of contingent liabilities and commitments (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of contingent liabilities [line items]    
Contingent liabilities € 42,821 € 44,544
Guarantees issued by ING Groep N.V. 197 336
Irrevocable facilities 166,810 161,940
Contingent liabilities and commitments 209,828 206,820
Contingent liabilities in respect of guarantees    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 27,894 28,859
Contingent liabilities in respect of irrevocable letters of credit    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 14,925 15,682
Contingent liabilities in respect of other    
Disclosure of contingent liabilities [line items]    
Contingent liabilities € 3