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Dividend Per Common Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 € / shares shares | Dec. 31, 2018 € / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 € / shares shares | Dec. 31, 2016
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share | € 0.31 | € 0.29 |  |  |
Common shares B [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Proposed dividend | € 0.00775 | € 0.00725 |  |  |
Financial rights attached to shares | 1/40th of a common share | 1/40th of a common share | 1/40th of a common share |  |
Final dividend 2018 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share |  | € 0.15 |  |  |
Percentage of shareholders receive cash dividend |  | 55.00% | 55.00% |  |
Stock dividend payable description |  | The stock dividend amounted to one new Aegon common share for every 28 common shares held | The stock dividend amounted to one new Aegon common share for every 28 common shares held |  |
Stock repurchase program to repurchase common shares | shares |  | 32,873,805 | 32,873,805 |  |
Period of repurchase |  | Between July 1, 2019 and August 2, 2019 | Between July 1, 2019 and August 2, 2019 |  |
Final dividend 2018 [member] | Common shares B [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share | € 0.004 |  |  |  |
Dividend per common share | $ / shares |  |  | $ 0.00375 |  |
Interim dividend 2018 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share |  | € 0.14 |  |  |
Percentage of shareholders receive cash dividend |  | 56.00% | 56.00% |  |
Percentage of shareholders receive stock dividend |  | 44.00% | 44.00% |  |
Cash dividend payable per common share |  | € 0.14 |  |  |
Stock dividend payable description |  | The stock dividend amounted to one new Aegon common share for every 37 common shares held. | The stock dividend amounted to one new Aegon common share for every 37 common shares held. |  |
Dividend payable, date to be paid |  | Sep. 21, 2018 | Sep. 21, 2018 |  |
Stock repurchase program to repurchase common shares | shares |  | 24,133,950 | 24,133,950 |  |
Period of repurchase |  | Between October 1, 2018, and November 9, 2018 | Between October 1, 2018, and November 9, 2018 |  |
Common shares repurchased average price per share |  | € 5.43 |  |  |
Interim dividend 2018 [member] | Common shares B [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Proposed dividend |  | € 0.0035 |  |  |
Dividends paid on common shares |  | 1/40th of the dividend paid on common shares | 1/40th of the dividend paid on common shares |  |
Interim dividend 2017 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Percentage of shareholders receive cash dividend |  |  |  | 57.00% |
Percentage of shareholders receive stock dividend |  | 42.00% | 42.00% | 43.00% |
Cash dividend payable per common share |  |  |  | € 0.13 |
Stock dividend payable description |  | The stock dividend amounted to one new Aegon common share for every 36 common shares held. | The stock dividend amounted to one new Aegon common share for every 36 common shares held. |  |
Dividend payable, date to be paid |  |  |  | Sep. 15, 2017 |
Stock repurchase program to repurchase common shares | shares |  |  |  | 51,864,626 |
Dividend per common share |  | € 0.14 |  |  |
Interim dividend 2017 [member] | Common shares B [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividends paid on common shares |  |  |  | 1/40th of the dividend paid on common shares |
Final dividend 2017 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Percentage of shareholders receive cash dividend |  | 58.00% | 58.00% |  |
Stock dividend payable description |  | One new Aegon common share for every 39 common shares held | One new Aegon common share for every 39 common shares held |  |
Dividend payable, date to be paid |  | Jun. 22, 2018 | Jun. 22, 2018 |  |
Stock repurchase program to repurchase common shares | shares |  | 21,954,140 | 21,954,140 |  |
Common shares repurchased average price per share |  |  |  | € 5.34 |
Final dividend 2016 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Stock dividend payable description |  | One new Aegon common share for every 30 common shares held. | One new Aegon common share for every 30 common shares held. |  |
Interim dividend 2016 [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Stock dividend payable description |  |  |  |  | The stock dividend amounted to one new Aegon common share for every 28 common shares held.
Common shares repurchased average price per share |  |  |  | € 5.0950 |
Interim Dividend 2019 [Member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share | € 0.15 |  |  |  |
Percentage of shareholders receive cash dividend | 55.00% |  |  |  |
Percentage of shareholders receive stock dividend | 45.00% |  |  |  |
Cash dividend payable per common share | € 0.15 |  |  |  |
Stock dividend payable description | the stock dividend amounted to one new Aegon common share for every 25 common shares held. |  |  |  |
Dividend payable, date to be paid | Sep. 20, 2019 |  |  |  |
Stock repurchase program to repurchase common shares | shares | 43,149,667 |  |  |  |
Period of repurchase | Between October 1, 2019, and November 8, 2019 |  |  |  |
Interim Dividend 2019 [Member] | Common shares B [member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Proposed dividend | € 0.00375 |  |  |  |
Dividends paid on common shares | 1/40th of the dividend paid on common shares |  |  |  |
Final Dividend 2019 [Member] |  |  |  |  |
Disclosure of detailed information of dividends [line items] |  |  |  |  |
Dividend per common share | € 0.16 |  |  |  |

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