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Staff expenses - Summary of number of employees (Details) - eMPLOYEE
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total average number of internal employees at full time equivalent basis 61,121 59,434 57,569
Netherlands      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total average number of internal employees at full time equivalent basis 14,821 14,449 14,488
Rest of the world      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total average number of internal employees at full time equivalent basis 46,301 44,985 43,081