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Subordinated Borrowings - Summary of Subordinated Borrowings (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Oct. 22, 2019
Apr. 11, 2018
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of subordinated liabilities [Line Items]          
Subordinated borrowings     € 2,207 € 1,389 [1] € 764
Aegon N.V [member]          
Disclosure of subordinated liabilities [Line Items]          
Subordinated borrowings     € 1,403 1,389 [2]  
EUR 700 million fixed floating subordinated notes [member]          
Disclosure of subordinated liabilities [Line Items]          
Coupon rate     4.00%    
Coupon date     Annually, April 25    
Year of next call     2024    
Subordinated borrowings     € 697 696  
EUR 700 million fixed floating subordinated notes [member] | Aegon N.V [member]          
Disclosure of subordinated liabilities [Line Items]          
Coupon rate     4.00%    
Coupon date     Annually, April 25    
Year of next call     2024    
Subordinated borrowings     € 697 696  
USD 800 million fixed floating subordinated notes [member]          
Disclosure of subordinated liabilities [Line Items]          
Coupon rate     5.50%    
Coupon date     Semi-annually, April 11    
Year of next call     2028    
Subordinated borrowings     € 707 693  
USD 800 million fixed floating subordinated notes [member] | Aegon N.V [member]          
Disclosure of subordinated liabilities [Line Items]          
Coupon rate   5.50% 5.50%    
Coupon date     Semi-annually, April 11    
Year of next call     2028    
Subordinated borrowings     € 707 € 693  
USD 925 million fixed subordinated notes [member]          
Disclosure of subordinated liabilities [Line Items]          
Coupon rate 5.10%   5.10%    
Coupon date     Quarterly, February 15    
Year of next call     2018    
Subordinated borrowings     € 804    
[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.
[2] 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 in the consolidated notes for details about this change.