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Staff expenses - Summary of number of employees (Details) - eMPLOYEE
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total average number of internal employees at full time equivalent basis 59,434 57,569 57,660
Netherlands      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total average number of internal employees at full time equivalent basis 14,449 14,488 15,138
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 44,985 43,081 42,523