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Structured entities - Covered bond programme (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of information about consolidated structured entities [line items]    
Fair value pledged mortgage loans € 27,148 € 21,379
Dutch Covered Bond Companies    
Disclosure of information about consolidated structured entities [line items]    
Fair value pledged mortgage loans € 27,148 € 21,379