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Equity - Schedule of non-distributable reserves (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]      
Non-distributable reserves € 6,727 € 8,408 € 8,205
ING Bank      
Disclosure of equity [Line Items]      
Non-distributable reserves 6,727 8,408 8,205
Other      
Disclosure of equity [Line Items]      
Non-distributable reserves € 0 € 0 € 0