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Other Equity Instruments - Summary of Coupon Details - Non-Cumulative Subordinated Notes (Detail) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | [1] | Jan. 01, 2018 | [1] | Dec. 31, 2017
Disclosure of other equity instruments [line items] |  |  |  |
Borrowings | € 9,307 | € 12,061 | € 13,635 |
Non-cumulative subordinated notes [member] |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |
Borrowings |  |  |  | € 271
Non-cumulative subordinated notes [member] | USD 525 million [member] |  |  |  |
Disclosure of other equity instruments [line items] |  |  |  |
Borrowings original currency | USD |  |  |
Coupon rate | 8.00% |  |  |
Coupon date | Quarterly, February 15 |  |  |
Year of next call | 2018 |  |  |
Borrowings |  |  |  | € 271
[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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