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Other Equity Instruments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 15, 2019
USD ($)
Jun. 15, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
May 15, 2018
USD ($)
Non-cumulative subordinated notes [member]              
Disclosure of other equity instruments [line items]              
Principal amount             $ 525,000,000
EUR 500 million [member]              
Disclosure of other equity instruments [line items]              
Coupon rate 6.50% 6.50%          
EUR 500 million [member] | Perpetual contingent convertible securities [member]              
Disclosure of other equity instruments [line items]              
Interest rate 5.207% 5.207%          
Coupon rate 5.625% 5.625%          
EUR 500 million [member] | Aegon N.V [member] | Junior perpetual capital securities [member]              
Disclosure of other equity instruments [line items]              
Principal amount   $ 500,000,000   $ 500,000,000   $ 500,000,000  
Coupon rate 6.50% 6.50%   6.50% 6.50% 6.50%  
EUR 500 million [member] | Aegon N.V [member] | Perpetual contingent convertible securities [member]              
Disclosure of other equity instruments [line items]              
Principal amount | € € 500,000,000       € 500,000,000    
Coupon rate 5.625% 5.625%     5.625% 5.625%  
Borrowings, interest rate basis 5 year mid swap plus a margin of 5.207%            
USD 1 billion [member]              
Disclosure of other equity instruments [line items]              
Coupon rate 6.375% 6.375%          
USD 1 billion [member] | Aegon N.V [member] | Junior perpetual capital securities [member]              
Disclosure of other equity instruments [line items]              
Principal amount   $ 1,000,000,000 $ 1,000,000,000     $ 1,000,000,000  
Coupon rate 6.375% 6.375% 6.375% 6.375% 6.375% 6.375%