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Commissions and Expenses - Summary of Commissions and Expenses (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of commissions and expenses [line items]      
Commissions € 2,423 € 2,445 € 2,661
Employee expenses 2,149 2,061 2,234
Administration expenses 1,537 1,477 1,424
Deferred expenses (832) (831) (980)
Amortization of deferred expenses 755 928 543
Amortization of VOBA and future servicing rights 120 144 43
Total 6,153 6,224 € 5,925
Aegon N.V [member]      
Disclosure of commissions and expenses [line items]      
Employee expenses 88 83  
Administration expenses 77 79  
Cost sharing to group companies (91) (80)  
Total € 74 € 82