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Borrowings - Additional Information (Detail)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Jan. 01, 2018
EUR (€)
 [1]
Disclosure of detailed information about borrowings [Line Items]        
Borrowings € 9,307   € 12,061 [1] € 13,635
Borrowings at fair value 9,783   12,421  
Difference between the contractually required payment at maturity date and the carrying amount 40   (8)  
Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Decrease in borrowing capacity 2,700   1,100  
Redemption of debt 1,400 $ 1,540    
Borrowings 7,562   10,287  
Principal amount € 500      
Coupon rate 0.625%      
FHLB advances [member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Decrease in borrowing capacity € 1,700   700  
Other [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings at fair value 461   536  
Negative credit spread on income before tax 1   (1)  
Negative credit spread on stockholder equity 1   (3)  
Cumulative negative credit spread on cumulative income before tax 28   26  
Other [member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings 8   12  
SAECURE 13" RMBS Note [member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Redemption of debt     700  
Other mortgages funding [member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Decrease in borrowing capacity 500   500  
SAECURE 16" RMBS Note [member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings € 512   € 875  
Expected weighted average life 4 years 9 months 18 days 4 years 9 months 18 days 4 years 1 month 6 days  
Coupon rate 3 month Euribor plus 40bps. 3 month Euribor plus 40bps. 3 month Euribor plus 40bps  
Seacure14 [Member] | Operational funding [member]        
Disclosure of detailed information about borrowings [Line Items]        
Redemption of debt € 900      
[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.