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Provisions - Additional Information (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of other provisions [Line Items]      
Litigation provisions € 90 € 198  
Provisions 214 320 [1] € 210
Fees payable upon purchase and surrender of unit-linked policies [member]      
Disclosure of other provisions [Line Items]      
Provisions 14 17  
Restructuring provisions [member]      
Disclosure of other provisions [Line Items]      
Provisions 43 30  
Other provisions [member]      
Disclosure of other provisions [Line Items]      
Provisions € 66 € 76  
[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.