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Share Capital - Additional Information (Detail) - EUR (€) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 23, 2019 | May 17, 2019 | May 18, 2018 | Dec. 31, 2019
Vereniging Aegon [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Percentage of shareholding stake in acquired company |  |  |  | 32.60%
Aegon N.V [member] | Vereniging Aegon [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Percentage of shareholding stake in acquired company | 32.60% |  |  | 32.60%
Common Share [member] | Aegon N.V [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Nominal value of issued shares |  |  |  | € 0.12
Common Share B [member] | Aegon N.V [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Nominal value of issued shares |  |  |  | € 0.12
Common shares B [member] | Vereniging Aegon [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Number of shares purchased on exercising options rights |  |  | 1,489,200 |
Common shares B [member] | Aegon N.V [member] | Vereniging Aegon [member] |  |  |  |
Disclosure of changes in share capital [Line Items] |  |  |  |
Number of shares purchased on exercising options rights |  | 1,773,680 |  |
Share buyback program, number of common shares repurchased | 13,227,120 |  |  |
Shares repurchased value | € 1,384,046 |  |  |

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- Details
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