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Other Equity Instruments - Additional Information (Detail) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 15, 2019 USD ($) | Jun. 15, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | May 15, 2018 USD ($)
Non-cumulative subordinated notes [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 525,000,000
EUR 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.50% | 6.50% |  |  |  |  |
EUR 500 million [member] | Perpetual contingent convertible securities [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Interest rate | 5.207% | 5.207% |  |  |  |  |
Coupon rate | 5.625% | 5.625% |  |  |  |  |
EUR 500 million [member] | Aegon N.V [member] | Junior perpetual capital securities [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000 |
Coupon rate | 6.50% | 6.50% |  | 6.50% | 6.50% | 6.50% |
EUR 500 million [member] | Aegon N.V [member] | Perpetual contingent convertible securities [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Principal amount | € | € 500,000,000 |  |  |  | € 500,000,000 |  |
Coupon rate | 5.625% | 5.625% |  |  | 5.625% | 5.625% |
Borrowings, interest rate basis | 5 year mid swap plus a margin of 5.207% |  |  |  |  |  |
USD 1 billion [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.375% | 6.375% |  |  |  |  |
USD 1 billion [member] | Aegon N.V [member] | Junior perpetual capital securities [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  | $ 1,000,000,000 |
Coupon rate | 6.375% | 6.375% | 6.375% | 6.375% | 6.375% | 6.375% |

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