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Subordinated Borrowings - Summary of Subordinated Borrowings (Detail) - EUR (€) € in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 22, 2019 | Apr. 11, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Subordinated borrowings |  |  | € 2,207 | € 1,389 | [1] | € 764
Aegon N.V [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Subordinated borrowings |  |  | € 1,403 | 1,389 | [2] |
EUR 700 million fixed floating subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Coupon rate |  |  | 4.00% |  |  |
Coupon date |  |  | Annually, April 25 |  |  |
Year of next call |  |  | 2024 |  |  |
Subordinated borrowings |  |  | € 697 | 696 |  |
EUR 700 million fixed floating subordinated notes [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Coupon rate |  |  | 4.00% |  |  |
Coupon date |  |  | Annually, April 25 |  |  |
Year of next call |  |  | 2024 |  |  |
Subordinated borrowings |  |  | € 697 | 696 |  |
USD 800 million fixed floating subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Coupon rate |  |  | 5.50% |  |  |
Coupon date |  |  | Semi-annually, April 11 |  |  |
Year of next call |  |  | 2028 |  |  |
Subordinated borrowings |  |  | € 707 | 693 |  |
USD 800 million fixed floating subordinated notes [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Coupon rate |  | 5.50% | 5.50% |  |  |
Coupon date |  |  | Semi-annually, April 11 |  |  |
Year of next call |  |  | 2028 |  |  |
Subordinated borrowings |  |  | € 707 | € 693 |  |
USD 925 million fixed subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Coupon rate | 5.10% |  | 5.10% |  |  |
Coupon date |  |  | Quarterly, February 15 |  |  |
Year of next call |  |  | 2018 |  |  |
Subordinated borrowings |  |  | € 804 |  |  |
[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.
[2] | 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 in the consolidated notes for details about this change.

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