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Other Equity Instruments - Summary of Coupon Details - Summary of Perpetual Contingent Convertible (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of other equity instruments [line items]      
Borrowings € 9,307 € 12,061 [1] € 13,635
Aegon N.V [member]      
Disclosure of other equity instruments [line items]      
Borrowings 1,257 € 1,292  
Perpetual contingent convertible securities [member]      
Disclosure of other equity instruments [line items]      
Borrowings 500    
Perpetual contingent convertible securities [member] | Aegon N.V [member]      
Disclosure of other equity instruments [line items]      
Borrowings € 500    
EUR 500 million [member]      
Disclosure of other equity instruments [line items]      
Coupon rate 6.50%    
EUR 500 million [member] | Perpetual contingent convertible securities [member]      
Disclosure of other equity instruments [line items]      
Coupon rate 5.625%    
Coupon date Semi-annually, April 15    
Borrowing maturity 2029    
Borrowings € 500    
Borrowings currency EUR    
EUR 500 million [member] | Perpetual contingent convertible securities [member] | Aegon N.V [member]      
Disclosure of other equity instruments [line items]      
Coupon rate 5.625% 5.625%  
Coupon date Semi-annually, April 15 Semi-annually, April 15  
Borrowing maturity 2029 2029  
Borrowings € 500    
Borrowings currency EUR EUR  
[1] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.