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Shareholder's Equity - Summary of Treasury Stock (Detail) - EUR (€) shares in Thousands, € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of treasury shares [line items] |  |  |
Total amount | € 281 | € 337 | € 325
Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Total amount | € 3 | € 2 | € 2
Aegon N.V [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Number of shares | 91,893 | 76,419 |
Total amount | € 281 | € 337 |
Aegon N.V [member] | Common shares [member] | Aegon N V [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Number of shares | 65,540 | 61,418 |
Total amount | € 269 | € 326 |
Aegon N.V [member] | Common shares [member] | Subsidiaries [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Number of shares | 1,043 | 1,144 |
Total amount | € 9 | € 9 |
Aegon N.V [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Number of shares | 25,310 | 13,856 | 15,346
Total amount | € 3 | € 2 | € 2

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