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Cover Page
 12 Months Ended
Dec. 31, 2019
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Trading Symbol AEG
Entity Registrant Name AEGON NV
Entity Central Index Key 0000769218
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Title of 12(b) Security Common shares
Security Exchange Name NYSE
Document Annual Report true
Document Transition Report false
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Address, Country NL
Document Shell Company Report false
Common shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 2,105,138,885
Common share B [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 585,022,160