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Other Equity Instruments - Summary of Coupon Details - Perpetual Cumulative Subordinated Bonds (Detail) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
Disclosure of other equity instruments [line items] |  |  |  |  |
Borrowings | € 9,307 | € 12,061 | [1] | € 13,635 |
Aegon N.V [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Borrowings | 1,257 | 1,292 |  |  |
Perpetual cumulative subordinated bonds [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Borrowings | 454 | 454 |  |  | € 454
Perpetual cumulative subordinated bonds [member] | Aegon N.V [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Borrowings | € 454 | 454 |  |  |
Perpetual cumulative subordinated bonds [member] | EUR 203 million [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 4.26% |  |  |  |
Coupon date | Annually, March 4 |  |  |  |
Year of next call | 2021 |  |  |  |
Borrowings | € 203 | 203 |  |  | 203
Perpetual cumulative subordinated bonds [member] | EUR 203 million [member] | Aegon N.V [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 4.26% |  |  |  |
Borrowings original currency | EUR |  |  |  |
Coupon date | Annually, March 4 |  |  |  |
Year of next call | 2021 |  |  |  |
Borrowings | € 203 | 203 |  |  |
Perpetual cumulative subordinated bonds [member] | EUR 114 million [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 1.506% |  |  |  |
Coupon date | Annually, June 8 |  |  |  |
Year of next call | 2025 |  |  |  |
Borrowings | € 114 | 114 |  |  | 114
Perpetual cumulative subordinated bonds [member] | EUR 114 million [member] | Aegon N.V [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 1.506% |  |  |  |
Borrowings original currency | EUR |  |  |  |
Coupon date | Annually, June 8 |  |  |  |
Year of next call | 2025 |  |  |  |
Borrowings | € 114 | 114 |  |  |
Perpetual cumulative subordinated bonds [member] | EUR 136 million [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 1.425% |  |  |  |
Borrowings original currency | EUR |  |  |  |
Coupon date | Annually, October 14 |  |  |  |
Year of next call | 2028 |  |  |  |
Borrowings | € 136 | 136 |  |  | € 136
Perpetual cumulative subordinated bonds [member] | EUR 136 million [member] | Aegon N.V [member] |  |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |  |
Coupon rate | 1.425% |  |  |  |
Borrowings original currency | EUR |  |  |  |
Coupon date | Annually, October 14 |  |  |  |
Year of next call | 2028 |  |  |  |
Borrowings | € 136 | € 136 |  |  |
[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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