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Related parties - Number of ING Groep N.V. shares and stock options to key management personnel (Details) - shares
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 3,147,391,000 3,498,194,000 3,726,539,000
ING Groep N.V. | Executive Board of ING Groep N.V.      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 152,652 128,241  
ING Groep N.V. | Management Board Banking      
Disclosure of key management personnel compensation [Line Items]      
Issued share capital, ordinary shares (in shares) 343,055 262,507  
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