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Investments in Joint Ventures and Associates - Schedule of Investments in Joint Ventures and Associates (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments in subsidiaries, joint ventures and associates [abstract] |  |  |  |  |
Beginning balance | € 1,745 | [1] | € 1,712 |  |
Additions | 151 |  | 120 |  |
Disposals | (1) |  | (211) |  |
Share in net income | 214 |  | 210 |  | € 161
Share in changes in equity (note 30.6) | 8 |  | 8 |  |
Dividend | (120) |  | (94) |  |
Net exchange difference | 2 |  | 4 |  |
Other | (16) |  | (5) |  |
Ending balance | 1,983 |  | 1,745 | [1] | 1,712
At January 1 | 327 | [1] | 308 |  |
Additions | 39 |  | 23 |  |
Disposals |  |  | (1) |  |
Share in net income | 12 |  | 6 |  | 11
Share in changes in equity (note 30.6) | 4 |  | 2 |  |
Impairment losses | (7) |  | (1) |  |
Dividends | (10) |  | (3) |  |
Net exchange difference | (1) |  | (8) |  |
Other | 0 |  |  |  |
At December 31 | € 363 |  | € 327 | [1] | € 308
[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 Additions to Investments in joint ventures. + References No definition available. + Details
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- Definition Disposal of investments in associates. + References No definition available. + Details
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- Definition Dividend received associates. + References No definition available. + Details
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- Definition Impairment losses on investments in associates. + References No definition available. + Details
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- Definition Increase (decrease) through changes in foreign exchange rates of investments in associates. + References No definition available. + Details
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- Definition Increase Decrease Through Changes In Foreign Exchange Rates Of Investments In Joint Ventures. + References No definition available. + Details
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- Definition Investments in joint ventures disposals. + References No definition available. + Details
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- Definition Investments in joint ventures other. + References No definition available. + Details
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- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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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 + Details
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- Definition The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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