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Proposal for Profit Appropriation - Additional Information (Detail)
May 17, 2019
€ / shares
Dec. 31, 2019
€ / shares
Dec. 31, 2019
$ / shares
Common shares [member]      
Disclosure of proposal profit appropriation [Line Items]      
Par value per share   € 0.12  
Common share B [member]      
Disclosure of proposal profit appropriation [Line Items]      
Par value per share | $ / shares     $ 0.12
Aegon N.V [member] | Common shares [member]      
Disclosure of proposal profit appropriation [Line Items]      
Par value per share   € 0.12  
Aegon N.V [member] | Common shares [member] | Dividend Distributed [member]      
Disclosure of proposal profit appropriation [Line Items]      
Dividends proposed as distributions to owners per share € 0.16    
Aegon N.V [member] | Common share B [member] | Dividend Distributed [member]      
Disclosure of proposal profit appropriation [Line Items]      
Dividends proposed as distributions to owners per share € 0.004