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Shareholders' Equity - Summary of Treasury Shares (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of revaluation reserve [Line Items]      
Number of shares 91,893,000 76,419,000 80,996,000
Total amount € 281 € 337 € 325
Common shares [member] | Aegon N V [member]      
Disclosure of revaluation reserve [Line Items]      
Number of shares 65,540,000 61,418,000 64,488,000
Total amount € 269 € 326 € 314
Common shares [member] | Subsidiaries [member]      
Disclosure of revaluation reserve [Line Items]      
Number of shares 1,043,000 1,144,000 1,162,000
Total amount € 9 € 9 € 9
Common shares B [member]      
Disclosure of revaluation reserve [Line Items]      
Number of shares 25,310,000 13,856,000 15,346,000
Total amount € 3 € 2 € 2
Common shares B [member] | Aegon N V [member]      
Disclosure of revaluation reserve [Line Items]      
Number of shares 25,309,920 13,856,480