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Derivatives - Derivatives Not Designated In Hedge - General Account (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account € 11,157 € 7,615 [1] € 5,912
Derivative liability, general account 11,616 7,230 [1] € 7,130
Derivatives for general account [member]      
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account 10,658 7,337  
Derivative liability, general account 11,501 7,174  
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member]      
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account 10,134 6,904  
Derivative liability, general account 11,060 6,879  
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Derivatives held as an economic hedge [member]      
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account 10,118 6,808  
Derivative liability, general account 7,854 4,278  
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Bifurcated embedded derivatives [member]      
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account 16 5  
Derivative liability, general account 3,197 2,588  
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Other [member]      
Disclosure of derivative financial instruments [Line Items]      
Derivative assets, general account   91  
Derivative liability, general account € 9 € 12  
[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.