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Segment Information - Summary of Number of Employees (Detail) - Employees
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of number of employees [line items]      
Number of employees 23,757 26,543 28,318
Americas [member]      
Disclosure of number of employees [line items]      
Number of employees 8,570 8,824 10,951
The Netherlands [member]      
Disclosure of number of employees [line items]      
Number of employees 3,582 3,548 3,089
United Kingdom [member]      
Disclosure of number of employees [line items]      
Number of employees 2,261 3,135 3,435
Southern & Eastern Europe [member]      
Disclosure of number of employees [line items]      
Number of employees 2,853 2,837 2,947
Asia [member]      
Disclosure of number of employees [line items]      
Number of employees 4,540 6,344 6,025
Joint ventures and associates [member]      
Disclosure of number of employees [line items]      
Number of employees 5,162 6,854 6,497
Joint ventures and associates [member] | Americas [member]      
Disclosure of number of employees [line items]      
Number of employees 651 559 549
Joint ventures and associates [member] | United Kingdom [member]      
Disclosure of number of employees [line items]      
Number of employees 62 58  
Joint ventures and associates [member] | Southern & Eastern Europe [member]      
Disclosure of number of employees [line items]      
Number of employees 104 86 83
Joint ventures and associates [member] | Asia [member]      
Disclosure of number of employees [line items]      
Number of employees 4,172 5,983 5,702
Asset management [member]      
Disclosure of number of employees [line items]      
Number of employees 1,535 1,464 1,500
Asset management [member] | Joint ventures and associates [member]      
Disclosure of number of employees [line items]      
Number of employees 173 168 163
Holding and other activities [member]      
Disclosure of number of employees [line items]      
Number of employees 416 390 371