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Borrowings - Summary of Detailed Composition of Capital Funding (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 9,307 € 12,061 [1] € 13,635
Capital funding [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 1,745 1,774  
Capital funding [member] | EUR 500 million unsecured notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon date August 30    
Borrowings issued year 2017    
Capital funding [member] | EUR 75 Million Medium-Term Notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 4.625%    
Coupon date December 9    
Borrowings issued year 2004    
Borrowings maturity year 2019    
Borrowings   78  
Capital funding [member] | USD 500 Million Senior Notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 5.75%    
Coupon date Semi-annually    
Borrowings issued year 2005    
Borrowings maturity year 2020    
Borrowings € 461 457  
Capital funding [member] | EUR 500 Million Senior Unsecured Notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 1.00%    
Coupon date December 8    
Borrowings issued year 2016    
Borrowings maturity year 2023    
Borrowings € 497 496  
Capital funding [member] | GBP 250 Million Medium-Term Notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 6.125%    
Coupon date December 15    
Borrowings issued year 1999    
Borrowings maturity year 2031    
Borrowings € 293 277  
Capital funding [member] | GBP 400 Million Senior Unsecured Notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 6.625%    
Coupon date Semi-annually    
Borrowings issued year 2009    
Borrowings maturity year 2039    
Borrowings € 467 440  
Capital funding [member] | Other [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 26 € 26  
[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.