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Other Equity Instruments - Summary of Coupon Details - Junior Perpetual Capital Securities (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 15, 2019
Jun. 15, 2019
Jan. 01, 2018
 [1]
Dec. 31, 2017
Disclosure of other equity instruments [line items]            
Borrowings € 9,307 € 12,061 [1]     € 13,635  
USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate 6.50%          
USD 1 billion [member]            
Disclosure of other equity instruments [line items]            
Coupon rate 6.375%          
EUR 200 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate 6.00%          
Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Borrowings € 1,257 1,292        
Junior perpetual capital securities [member]            
Disclosure of other equity instruments [line items]            
Borrowings € 1,564         € 3,008
Junior perpetual capital securities [member] | USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Borrowings currency USD          
Coupon date, as of Quarterly, December 15          
Year of next call 2019          
Borrowings   424       424
Junior perpetual capital securities [member] | USD 250 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating LIBOR rate          
Borrowings currency USD          
Coupon date, as of Quarterly, December 15          
Year of next call 2020          
Borrowings € 212 212       212
Junior perpetual capital securities [member] | USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating CMS rate          
Borrowings currency USD          
Coupon date, as of Quarterly, July 15          
Year of next call 2020          
Borrowings € 402 402       402
Junior perpetual capital securities [member] | USD 1 billion [member]            
Disclosure of other equity instruments [line items]            
Borrowings currency USD          
Coupon date, as of Quarterly, June 15          
Year of next call 2019          
Borrowings   821       821
Junior perpetual capital securities [member] | EUR 950 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating DSL rate          
Borrowings currency EUR          
Coupon date, as of Quarterly, July 15          
Year of next call 2020          
Borrowings € 950 950       950
Junior perpetual capital securities [member] | EUR 200 million [member]            
Disclosure of other equity instruments [line items]            
Borrowings currency EUR          
Coupon date, as of Annually, July 21          
Year of next call 2018          
Borrowings   2,808       € 200
Junior perpetual capital securities [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Borrowings € 1,564 € 2,808        
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate 6.50% 6.50%   6.50%    
Borrowings currency USD USD        
Coupon date, as of Quarterly, December 15 Quarterly, December 15        
Year of next call 2019 2019        
Borrowings € 424        
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 250 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating LIBOR rate floating LIBOR rate        
Borrowings currency USD USD        
Coupon date, as of Quarterly, December 15 Quarterly, December 15        
Year of next call 2020 2020        
Borrowings € 212 € 212        
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating CMS rate floating CMS rate        
Borrowings currency USD USD        
Coupon date, as of Quarterly, July 15 Quarterly, July 15        
Year of next call 2020 2020        
Borrowings € 402 € 402        
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 1 billion [member]            
Disclosure of other equity instruments [line items]            
Coupon rate 6.375% 6.375% 6.375% 6.375%    
Borrowings currency USD USD        
Coupon date, as of Quarterly, June 15 Quarterly, June 15        
Year of next call 2019 2019        
Borrowings € 821        
Junior perpetual capital securities [member] | Aegon N.V [member] | EUR 950 million [member]            
Disclosure of other equity instruments [line items]            
Coupon rate floating DSL rate floating DSL rate        
Borrowings currency EUR EUR        
Coupon date, as of Quarterly, July 15 Quarterly, July 15        
Year of next call 2020 2020        
Borrowings € 950 € 950        
Junior perpetual capital securities [member] | Aegon N.V [member] | EUR 200 million [member]            
Disclosure of other equity instruments [line items]            
Year of next call   2018        
[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.