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Borrowings - Summary of Detailed Composition of Operational 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
Operational funding [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 7,562 10,287  
Operational funding [member] | Revolving Loan Facility Warehouse Mortgage Loans [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Monthly    
Borrowing maturity 2020-22    
Borrowings € 817 375  
Operational funding [member] | SAECURE 14" RMBS Note [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2014/19    
Borrowings   874  
Operational funding [member] | SAECURE 15" RMBS Note [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2014/20    
Borrowings € 917 1,038  
Operational funding [member] | SAECURE 16" RMBS Note [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2018/23    
Borrowings € 512 875  
Operational funding [member] | EUR 750 million Conditional Pass-Through Covered Bond [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 0.267%    
Coupon date Annual    
Borrowing maturity 2015/20    
Borrowings € 749 748  
Operational funding [member] | EUR 500 million Conditional Pass-Through Covered Bond [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 0.25%    
Coupon date Annual    
Borrowing maturity 2016/23    
Borrowings € 498 497  
Operational funding [member] | EUR 500 million Conditional Pass-Through Covered Bond [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 0.75%    
Coupon date Annual    
Borrowing maturity 2017/27    
Borrowings € 489 488  
Operational funding [member] | EUR 500 million Conditional Pass-Through Covered Bond [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate 0.375%    
Coupon date Annual    
Borrowing maturity 2017/24    
Borrowings € 498 497  
Operational funding [member] | Variable Funding Surplus Note [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2006/36    
Borrowings   1,388  
Operational funding [member] | FHLB Secured Borrowings [member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2016/46    
Borrowings € 1,777 3,495  
Operational funding [member] | Other [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 8 € 12  
Operational funding [member] | EUR 512 million "SAECURE 18" RMBS Note [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Floating    
Coupon date Quarterly    
Borrowing maturity 2019/25    
Borrowings € 491    
Operational funding [member] | Aegon Bank Senior Non-Preferred debt [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Coupon rate Fixed    
Coupon date Annual    
Borrowing maturity 2019/24    
Borrowings € 497    
[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.