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Investments in Joint Ventures and Associates - Summary of Financial Information of Joint Ventures (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [1]
Disclosure of joint ventures [Line Items]      
Net income / (loss) € 1,239 € 711 [1] € 2,469
Other comprehensive income 2,232 (1,107) [1] (1,968)
Total comprehensive income / (loss) 3,471 (396) [1] € 501
Amvest [member]      
Disclosure of joint ventures [Line Items]      
Net income / (loss) 398 432  
Total comprehensive income / (loss) 398 432  
Amvest [member] | Aegon legal stake in the joint ventures [member]      
Disclosure of joint ventures [Line Items]      
Net income / (loss) 125 144  
Total comprehensive income / (loss) 125 144  
Other Joint ventures [member]      
Disclosure of joint ventures [Line Items]      
Net income / (loss) 183 144  
Other comprehensive income 13 12  
Total comprehensive income / (loss) 196 156  
Other Joint ventures [member] | Aegon legal stake in the joint ventures [member]      
Disclosure of joint ventures [Line Items]      
Net income / (loss) 88 66  
Other comprehensive income 7 5  
Total comprehensive income / (loss) € 95 € 71  
[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.