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Share Capital - Movement of Common Shares (Detail)
shares in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
shares
Dec. 31, 2017
EUR (€)
shares
Disclosure of changes in share capital [Line Items]      
Beginning balance | shares 76,419 80,996  
Dividend | shares    
Ending balance | shares 91,893 76,419 80,996
Beginning balance € 322    
Ending balance 323 € 322  
Common shares [member]      
Disclosure of changes in share capital [Line Items]      
Beginning balance 251 251 € 249
Dividend 1   3
Ending balance € 253 € 251 € 251
Common shares [member] | Aegon N.V [member]      
Disclosure of changes in share capital [Line Items]      
Beginning balance | shares 2,095,648 2,095,648  
Dividend | shares 9,491    
Ending balance | shares 2,105,139 2,095,648 2,095,648
Beginning balance € 251 € 251  
Dividend 1  
Ending balance 253 251 € 251
Common share B [member]      
Disclosure of changes in share capital [Line Items]      
Beginning balance 70 70 70
Ending balance € 70 € 70 € 70
Common share B [member] | Aegon N.V [member]      
Disclosure of changes in share capital [Line Items]      
Beginning balance | shares 585,022 585,022  
Dividend | shares 0    
Ending balance | shares 585,022 585,022 585,022
Beginning balance € 70 € 70  
Dividend 0  
Ending balance € 70 € 70 € 70