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Related parties - Number of ING Groep N.V. shares and stock options to key management personnel (Details) - shares
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 3,498,194,000 3,726,539,000 3,904,065,000
ING Groep N.V.      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 396,043 408,086  
ING Groep N.V. | Executive Board members      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 128,241 108,217  
ING Groep N.V. | Management Board Banking      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 262,507 294,574  
ING Groep N.V. | Supervisory Board members      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 5,295 5,295