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Share Capital - Detailed Information of Issued and Outstanding Capital (Detail) - Aegon N.V [member] - EUR (€)
€ / shares in Units, € in Millions, shares in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [Line Items]    
Common shares € 323 € 322
Common Share [member]    
Disclosure of classes of share capital [Line Items]    
Common shares 253 251
Authorized share capital € 720 € 720
Number of authorized shares (in million) 6,000 6,000
Par value in cents per share € 12 € 12
Common Share B [member]    
Disclosure of classes of share capital [Line Items]    
Common shares € 70 € 70
Authorized share capital € 360 € 360
Number of authorized shares (in million) 3,000 3,000
Par value in cents per share € 12 € 12