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Other Equity Instruments - Summary of Coupon Details - Junior Perpetual Capital Securities (Parenthetical) (Detail) - Junior perpetual capital securities [member] | 12 Months Ended |  |  |  |
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Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 15, 2019 USD ($) | Jun. 15, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($)
USD 500 million [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000
USD 250 million [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 250,000,000 |  |  |  |
Basis point | 87.50% | 87.50% |  |  |  |
Basis point interest rate | 4.00% | 4.00% |  |  |  |
Basis point description | The coupon of the USD 250 million junior perpetual capital securities is reset each quarter based on the then prevailing three-month LIBOR yield plus a spread of 87.5 basis points, with a minimum of 4%. |  |  |  |  |
USD 250 million [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 250,000,000 |  |  |  | 250,000,000
Basis point | 0.875% | 0.875% |  |  |  |
Basis point interest rate | 4.00% | 4.00% |  |  |  |
Basis point description | The coupon of the USD 250 million junior perpetual capital securities is reset each quarter based on the then prevailing three-month LIBOR yield plus a spread of 87.5 basis points, with a minimum of 4%. |  |  |  |  |
USD 500 million [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |
Basis point interest rate | 8.50% | 8.50% |  |  |  |
Basis point description | The coupon of the USD 500 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year US dollar interest rate swap yield plus a spread of ten basis points, with a maximum of 8.5%. |  |  |  |  |
USD 500 million [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  | 500,000,000
Basis point | 0.10% | 0.10% |  |  |  |
Basis point interest rate | 8.50% | 8.50% |  |  |  |
Basis point description | The coupon of the USD 500 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year US dollar interest rate swap yield plus a spread of ten basis points, with a maximum of 8.5%. |  |  |  |  |
USD 1 billion [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  | $ 1,000,000,000
EUR 950 million [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount |  | $ 950,000,000 |  |  |  |
Basis point interest rate | 8.00% | 8.00% |  |  |  |
Basis point description | The coupon of the EUR 950 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year Dutch government bond yield plus a spread of ten basis points, with a maximum of 8%. |  |  |  |  |
EUR 950 million [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |
Principal amount | € | € 950,000,000 |  |  |  | € 950,000,000 |
Basis point | 0.10% | 0.10% |  |  |  |
Basis point interest rate | 8.00% | 8.00% |  |  |  |
Basis point description | The coupon of the EUR 950 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year Dutch government bond yield plus a spread of ten basis points, with a maximum of 8%. |  |  |  |  |

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