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Guarantees in Insurance Contracts - Summary of Liabilities for Financial Guarantees for Minimum Benefits, Net of Present Value of Expected Future Premiums (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Liabilities under insurance contracts and reinsurance contracts issued [line items]      
Beginning balance [1] € 115,328    
Ending balance 123,454 € 115,328 [1]  
Account value 135,710 117,113 [1] € 122,168
Net amount at risk 226,374 194,353 [1] € 194,063
The Netherlands [member]      
Liabilities under insurance contracts and reinsurance contracts issued [line items]      
Beginning balance 34,878    
Ending balance 40,554 34,878  
Net amount at risk 25,491 23,767  
Financial Guarantee Contracts [member]      
Liabilities under insurance contracts and reinsurance contracts issued [line items]      
Beginning balance 2,445 1,794  
Incurred guarantee benefits 575 622  
Paid guarantee benefits (1) (1)  
Net exchange differences 13 29  
Ending balance 3,031 2,445  
Account value 43,130 38,963  
Net amount at risk 2,239 2,239  
Financial Guarantee Contracts [member] | United States [member]      
Liabilities under insurance contracts and reinsurance contracts issued [line items]      
Beginning balance 766 247  
Incurred guarantee benefits 518 491  
Paid guarantee benefits (1) (1)  
Net exchange differences 13 29  
Ending balance 1,296 766  
Account value 34,503 30,788  
Net amount at risk 236 235  
Financial Guarantee Contracts [member] | The Netherlands [member]      
Liabilities under insurance contracts and reinsurance contracts issued [line items]      
Beginning balance 1,678 1,547  
Incurred guarantee benefits 57 131  
Ending balance 1,735 1,678  
Account value 8,626 8,175  
Net amount at risk € 2,002 € 2,004  
[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.