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Events After the Reporting Period - Additional Information (Detail) - EUR (€)
€ in Millions
Mar. 03, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items]        
Investments exposure   € 157,831 € 156,541 € 145,976
RUSSIAN FEDERATION | Adjusting Events After Reporting Period [Member]        
Disclosure of non-adjusting events after reporting period [line items]        
Investments exposure € 27      
Ukraine | Adjusting Events After Reporting Period [Member]        
Disclosure of non-adjusting events after reporting period [line items]        
Investments exposure 42      
Russia And Ukraine [Member] | Adjusting Events After Reporting Period [Member]        
Disclosure of non-adjusting events after reporting period [line items]        
Investments exposure 38      
Aegon N.V [member] | RUSSIAN FEDERATION        
Disclosure of non-adjusting events after reporting period [line items]        
Direct investment exposure 27      
Aegon N.V [member] | Ukraine        
Disclosure of non-adjusting events after reporting period [line items]        
Direct investment exposure 42      
Aegon N.V [member] | Russia And Ukraine [Member]        
Disclosure of non-adjusting events after reporting period [line items]        
Investment exposure on account of policyholders with guarantee € 38