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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands, € in Millions, £ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2017
EUR (€)
Mar. 31, 2019
USD ($)
Nov. 30, 2018
Customer
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2013
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
EUR (€)
 [1]
Dec. 31, 2017
EUR (€)
Disclosure of commitments and contingencies [line items]                        
Net charge to income statement       € 214         € 320 [1]   € 210  
Litigation preliminary settlement amount granted by court             € 25          
Other provisions       214         320     € 210
Guarantees Cancelled       € 0                
Sale of stock, consideration received € 295                      
Litigation provision [member]                        
Disclosure of commitments and contingencies [line items]                        
Net charge to income statement | $                   $ 166,000    
Policy holders objected to settlement       99.00% 99.00%              
Policy holders opting out of settlement       1.00% 1.00%              
Opted out shareholders value in Settlement fund       43.00% 43.00%              
Other provisions       € 14                
Provision for unclaimed property [Member]                        
Disclosure of commitments and contingencies [line items]                        
Other provisions | $               $ 25,000        
Transamerica Corporation [member] | LTCG [Member]                        
Disclosure of commitments and contingencies [line items]                        
Contractual obligations payment amount | $   $ 390,000                    
Atos BPS Ltd [member] | Aegon United Kingdom [member]                        
Disclosure of commitments and contingencies [line items]                        
Contractual obligations transition and conversion charges | £           £ 60            
Contractual obligations period       Next three years Next three years              
Contract agreement term       15-year 15-year              
Number of customers | Customer     1,400,000                  
Aegon N.V [member]                        
Disclosure of commitments and contingencies [line items]                        
Net charge to income statement                 10      
Transamerica Corporation [member]                        
Disclosure of commitments and contingencies [line items]                        
Alleged actual damages andpre-judgment interest | $         $ 120,000              
Amount of damages and interest | $         $ 235              
Contractual dispute period, description       A former subsidiary of Transamerica Corporation was involved in a contractual dispute with a Nigerian travel broker that arose in 1976. That dispute was resolved in Delaware court for USD 235 thousand plus interest in 2010. The plaintiff took the Delaware judgment relating to the 1976 dispute to a Nigerian court and alleged that it was entitled to approximately the same damages for 1977 through 1984 despite the absence of any contract relating to those years. The Nigerian trial court issued a judgment in favor of the plaintiff of the alleged actual damages as well as pre-judgment interest of approximately USD 120 million. On appeal this decision was reversed on procedural grounds and remanded back to the trial court which ruled to dismiss the case; however, the Plaintiff appealed the trial court’s ruling. The appeal is still pending. Aegon has no material assets located in Nigeria. A former subsidiary of Transamerica Corporation was involved in a contractual dispute with a Nigerian travel broker that arose in 1976. That dispute was resolved in Delaware court for USD 235 thousand plus interest in 2010. The plaintiff took the Delaware judgment relating to the 1976 dispute to a Nigerian court and alleged that it was entitled to approximately the same damages for 1977 through 1984 despite the absence of any contract relating to those years. The Nigerian trial court issued a judgment in favor of the plaintiff of the alleged actual damages as well as pre-judgment interest of approximately USD 120 million. On appeal this decision was reversed on procedural grounds and remanded back to the trial court which ruled to dismiss the case; however, the Plaintiff appealed the trial court’s ruling. The appeal is still pending. Aegon has no material assets located in Nigeria.              
Transamerica Corporation [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Due and punctual payment of payables due under letter of credit agreements       € 1,666         3,164      
Transamerica Corporation [member] | Aegon N.V [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Due and punctual payment of payables due under letter of credit agreements       1,666         3,164      
Transamerica Corporation [member] | TLIC Riverwood Reinsurance Inc [member]                        
Disclosure of commitments and contingencies [line items]                        
Cash payments of reinsurance obligations from subsidiary to third party                 1,892     € 1,793
Transamerica Corporation and Commonwealth General Corporation [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Due and punctual payment of payables due under letter of credit agreements       2,249         3,469      
Transamerica Corporation and Commonwealth General Corporation [member] | Aegon N.V [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Due and punctual payment of payables due under letter of credit agreements       2,249         3,469      
Subsidiaries [member]                        
Disclosure of commitments and contingencies [line items]                        
Securities and notes issued under commercial paper program       0         614      
Subsidiaries [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Other letter of credit agreements                 60      
Securities and notes issued under commercial paper program       0                
Subsidiaries [member] | Aegon N.V [member]                        
Disclosure of commitments and contingencies [line items]                        
Securities and notes issued under commercial paper program       1,449         614      
Subsidiaries [member] | Aegon N.V [member] | Guarantees [member]                        
Disclosure of commitments and contingencies [line items]                        
Other letter of credit agreements       € 10         € 60      
[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.