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Shares in Group Companies - Summary of Shares in Group Companies (Detail) - Aegon N.V [member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of interests in other entities [Line Items] |  |  |  |  |  |
At January 1 |  | € 22,143 | [1] | € 23,117 |  |
Capital contributions and acquisitions |  | 231 |  | 97 |  |
Divestments and capital repayments |  | (6) |  | (23) |  |
Dividend received |  | (872) |  | (702) |  |
Net income / (loss) for the financial year |  | 1,379 |  | 832 |  | € 2,511
Revaluations |  | 2,214 |  | (1,157) |  |
Ending balance |  | 25,045 |  | 22,143 | [1] | 23,117
Previously stated [member] |  |  |  |  |  |
Disclosure of interests in other entities [Line Items] |  |  |  |  |  |
At January 1 | [2] | (44) |  | (22) |  |
Ending balance | [2] |  |  | (44) |  | (22)
Restated [member] |  |  |  |  |  |
Disclosure of interests in other entities [Line Items] |  |  |  |  |  |
At January 1 |  | € 22,099 |  | 23,095 |  |
Ending balance |  |  |  | € 22,099 |  | € 23,095
[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 in the consolidated notes for details about this change.
[2] | See in consolidated financial statements note 2.1.1 for details about the impact of adopting IFRS 16 on Leases and note 2.1.2 for details about the impact of voluntary change in accounting policy on Liability Adequacy Testing

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_24_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_e&doctype=Standard -URIDate 2019-03-27 + Details
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