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Interest Charges and Related Fees - Summary of Interest Charges and Related Fees (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of interest charges and related fees [line items]      
Subordinated loans € 88 € 62 € 34
Trust pass-through securities 8 8 9
Borrowings 252 300 283
Other 164 136 108
Total 513 507 € 435
Aegon N.V [member]      
Disclosure of interest charges and related fees [line items]      
Subordinated borrowings 80 63  
Borrowings 57 55  
Other 2    
Total € 139 € 118