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Five-Year Schedule of Maturities of Debt (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings € 2,207 € 1,389 [1] € 764
Long-term borrowings 4,338 10,682  
Aegon N.V [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings 1,403 1,389 [2]  
Long-term borrowings 1,257 1,292 [2]  
Aegon N.V [member] | Not later than 1 year [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings    
Long-term borrowings 78  
Aegon N.V [member] | 12-24 months [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings    
Long-term borrowings    
Aegon N.V [member] | Later than two years and not later than three years [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings    
Long-term borrowings    
Aegon N.V [member] | Later than three years and not later than four years [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings    
Long-term borrowings 497    
Aegon N.V [member] | Later than four years and not later than five years [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings    
Long-term borrowings 496  
Aegon N.V [member] | Later than 5 years [member]      
Disclosure of long-term borrowings [Line Items]      
Subordinated borrowings 1,403 1,389  
Long-term borrowings € 760 € 717  
[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.