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Other Equity Instruments - Summary of Coupon Details - Non-Cumulative Subordinated Notes (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Jan. 01, 2018
 [1]
Dec. 31, 2017
Disclosure of other equity instruments [line items]        
Borrowings € 9,307 € 12,061 € 13,635  
Non-cumulative subordinated notes [member]        
Disclosure of other equity instruments [line items]        
Borrowings       € 271
Non-cumulative subordinated notes [member] | USD 525 million [member]        
Disclosure of other equity instruments [line items]        
Borrowings original currency USD      
Coupon rate 8.00%      
Coupon date Quarterly, February 15      
Year of next call 2018      
Borrowings       € 271
[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.