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Long-Term Borrowings - Summary of Long-Term Borrowings (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
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Disclosure of long-term borrowings [Line Items] |  |  |  |
Borrowings | € 9,307 | € 12,061 | [1] | € 13,635
Aegon N.V [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Borrowings | 1,257 | 1,292 |  |
Aegon N.V [member] | Not later than 1 year [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Borrowings |  | 78 |  |
Aegon N.V [member] | 1-5 years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Borrowings | 497 | 496 |  |
Aegon N.V [member] | Over 10 years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Borrowings | € 760 | € 717 |  |
[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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