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Investment Contracts - Additional Information (Detail) € in Millions, £ in Billions | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 GBP (£) | Jan. 01, 2018 EUR (€) | [1]
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Disclosure of investment contracts general account [Line Items] |  |  |  |  |
Investment contracts liabilities | € 18,594 | € 18,048 | [1] |  | € 16,943
BlackRock Part VII [member] |  |  |  |  |
Disclosure of investment contracts general account [Line Items] |  |  |  |  |
Investment contracts liabilities |  | € 18,400 |  | £ 16.3 |
[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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- Definition The amount of liabilities relating to investment contracts that fall within the scope of IAS 39 or IFRS 9. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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