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Information on remuneration - Accumulated annual pension entitlements and pension-related costs (Detail) - Board of management [Member]
Dec. 31, 2020
EUR (€)
Information on remuneration [Line Items]  
Pension-related costs € 1,038,853
F.A. van Houten [Member]  
Information on remuneration [Line Items]  
Age 60
Accumulated annual pension € 329,412
Pension-related costs € 592,924
A. Bhattacharya [Member]  
Information on remuneration [Line Items]  
Age 59
Accumulated annual pension € 33,307
Pension-related costs € 260,128
M.J. van Ginneken [Member]  
Information on remuneration [Line Items]  
Age 47
Accumulated annual pension € 46,220
Pension-related costs € 185,802