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Investments in Joint Ventures and Associates - Additional information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Jan. 01, 2018	[1]	Dec. 31, 2017
Disclosure of joint ventures [Line Items]
Disposals	€ 1	€ 211
Investments in joint ventures	1,983	1,745	[1]	€ 1,712		€ 1,712
Carrying value of joint ventures investment net of provision		1,729
Negative carrying value of joint ventures investment reclassified to Provisions		16
Amvest [member]
Disclosure of joint ventures [Line Items]
Disposals		211
Investments in joint ventures	€ 1,159	€ 1,001
[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

Carrying value of iInvestments in joint ventures reclassified to provisions.

+ References

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- Definition

Investments in joint ventures disposals.

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- Definition

Investments in joint ventures net of carrying values reclassified to provisions.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 10
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard
-URIDate 2019-03-27

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