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Investments for Account of Policyholders - Summary of Investments for Account of Policyholders (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives € 225,788 € 193,741  
Investments in real estate 586 612  
Total investments for account of policyholders 226,374 194,353 [1] € 194,063
Investment in shares [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives 25,288 20,640  
Investment in debt securities [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives 20,744 20,441  
Money market and other short-term investments - carried at fair value [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives 1,805 1,578  
Deposits with financial institutions [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives 3,278 3,263  
Investment in unconsolidated investment funds [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives 170,039 143,800  
Other investments [member]      
Disclosure of investments for account of policyholders [Line Items]      
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives € 4,634 € 4,020  
[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.