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Other Equity Instruments - Summary of Coupon Details - Junior Perpetual Capital Securities (Detail) - EUR (€) € in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 15, 2019 | Jun. 15, 2019 | Jan. 01, 2018 | [1] | Dec. 31, 2017
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings | € 9,307 | € 12,061 | [1] |  |  | € 13,635 |
USD 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.50% |  |  |  |  |  |
USD 1 billion [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.375% |  |  |  |  |  |
EUR 200 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.00% |  |  |  |  |  |
Aegon N.V [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings | € 1,257 | 1,292 |  |  |  |  |
Junior perpetual capital securities [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings | € 1,564 |  |  |  |  |  | € 3,008
Junior perpetual capital securities [member] | USD 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings currency | USD |  |  |  |  |  |
Coupon date, as of | Quarterly, December 15 |  |  |  |  |  |
Year of next call | 2019 |  |  |  |  |  |
Borrowings |  | 424 |  |  |  |  | 424
Junior perpetual capital securities [member] | USD 250 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating LIBOR rate |  |  |  |  |  |
Borrowings currency | USD |  |  |  |  |  |
Coupon date, as of | Quarterly, December 15 |  |  |  |  |  |
Year of next call | 2020 |  |  |  |  |  |
Borrowings | € 212 | 212 |  |  |  |  | 212
Junior perpetual capital securities [member] | USD 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating CMS rate |  |  |  |  |  |
Borrowings currency | USD |  |  |  |  |  |
Coupon date, as of | Quarterly, July 15 |  |  |  |  |  |
Year of next call | 2020 |  |  |  |  |  |
Borrowings | € 402 | 402 |  |  |  |  | 402
Junior perpetual capital securities [member] | USD 1 billion [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings currency | USD |  |  |  |  |  |
Coupon date, as of | Quarterly, June 15 |  |  |  |  |  |
Year of next call | 2019 |  |  |  |  |  |
Borrowings |  | 821 |  |  |  |  | 821
Junior perpetual capital securities [member] | EUR 950 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating DSL rate |  |  |  |  |  |
Borrowings currency | EUR |  |  |  |  |  |
Coupon date, as of | Quarterly, July 15 |  |  |  |  |  |
Year of next call | 2020 |  |  |  |  |  |
Borrowings | € 950 | 950 |  |  |  |  | 950
Junior perpetual capital securities [member] | EUR 200 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings currency | EUR |  |  |  |  |  |
Coupon date, as of | Annually, July 21 |  |  |  |  |  |
Year of next call | 2018 |  |  |  |  |  |
Borrowings |  | 2,808 |  |  |  |  | € 200
Junior perpetual capital securities [member] | Aegon N.V [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Borrowings | € 1,564 | € 2,808 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.50% | 6.50% |  |  | 6.50% |  |
Borrowings currency | USD | USD |  |  |  |  |
Coupon date, as of | Quarterly, December 15 | Quarterly, December 15 |  |  |  |  |
Year of next call | 2019 | 2019 |  |  |  |  |
Borrowings |  | € 424 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 250 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating LIBOR rate | floating LIBOR rate |  |  |  |  |
Borrowings currency | USD | USD |  |  |  |  |
Coupon date, as of | Quarterly, December 15 | Quarterly, December 15 |  |  |  |  |
Year of next call | 2020 | 2020 |  |  |  |  |
Borrowings | € 212 | € 212 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 500 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating CMS rate | floating CMS rate |  |  |  |  |
Borrowings currency | USD | USD |  |  |  |  |
Coupon date, as of | Quarterly, July 15 | Quarterly, July 15 |  |  |  |  |
Year of next call | 2020 | 2020 |  |  |  |  |
Borrowings | € 402 | € 402 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | USD 1 billion [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | 6.375% | 6.375% |  | 6.375% | 6.375% |  |
Borrowings currency | USD | USD |  |  |  |  |
Coupon date, as of | Quarterly, June 15 | Quarterly, June 15 |  |  |  |  |
Year of next call | 2019 | 2019 |  |  |  |  |
Borrowings |  | € 821 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | EUR 950 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Coupon rate | floating DSL rate | floating DSL rate |  |  |  |  |
Borrowings currency | EUR | EUR |  |  |  |  |
Coupon date, as of | Quarterly, July 15 | Quarterly, July 15 |  |  |  |  |
Year of next call | 2020 | 2020 |  |  |  |  |
Borrowings | € 950 | € 950 |  |  |  |  |
Junior perpetual capital securities [member] | Aegon N.V [member] | EUR 200 million [member] |  |  |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |  |  |
Year of next call |  | 2018 |  |  |  |  |
[1] | Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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