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Information on remuneration - Shares held by Board members (Detail) - Board of management [Member] - shares
Dec. 31, 2018
Dec. 31, 2017
A. Bhattacharya [Member]    
Information on remuneration - Text Details (Detail) [Line Items]    
Shares held [1] 66,794 53,974
F.A. van Houten [Member]    
Information on remuneration - Text Details (Detail) [Line Items]    
Shares held [1] 292,302 233,119
H. von Prondzynski [Member]    
Information on remuneration - Text Details (Detail) [Line Items]    
Shares held [1] 3,937 3,851
J.P. Tai [Member]    
Information on remuneration - Text Details (Detail) [Line Items]    
Shares held [1] 3,844 3,844
M.J. van Ginneken [Member]    
Information on remuneration - Text Details (Detail) [Line Items]    
Shares held [1] 47,856 30,246
[1] Reference date for board membership is December 31, 2018.