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Investments in Joint Ventures and Associates - Schedule of Financial Information of Associates (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
[1]
Disclosure of associates [Line Items]        
Net income/(loss) € 1,239 € 711 [1] € 2,469 [1]  
Other comprehensive income 2,232 (1,107) [1] (1,968) [1]  
Total comprehensive income 3,471 (396) [1] 501 [1]  
Carrying amount 363 327 [1] € 308 € 308
Aegon [member]        
Disclosure of associates [Line Items]        
Net income/(loss) 7 6    
Other comprehensive income (7) 2    
Total comprehensive income   9    
Carrying amount € 350 € 327    
[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.