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v3.20.1

Related Party Transactions - Additional Information (Detail) - EUR (€) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 23, 2019 | May 17, 2019 | May 18, 2018 | Dec. 19, 2017 | Jun. 23, 2017 | May 19, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Proportion of voting rights held by related party | 32.60% |  |  |  |  |  |  |  |
Shares held in the entity |  |  |  |  |  |  | 38,210 | 48,210 |
Shares held in the entity that do not exceed the total of outstanding share capital, percentage |  |  |  |  |  |  | 1.00% |  |
Key Management [Member] |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Fixed Compensation Amount |  |  |  |  |  |  | € 26,400,000 | € 21,500,000 | € 19,400,000
severance payment [Member] | Key Management [Member] |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Fixed Compensation Amount |  |  |  |  |  |  | € 717,000 |  |
Vereniging Aegon [member] | Common shares B [member] |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Number of shares repurchased | 13,227,120 | 1,773,680 | 1,489,200 | 13,042,592 | 13,042,612 | 1,979,260 |  |  |
Proportion of value weight average price of common shares of 5 trading days | 2.50% | 2.50% | 2.50% | 2.50% | 2.50% | 2.50% |  |  |
Number of shares repurchased, value | € 1,384,046 |  |  | € 1,725,169 |  |  |  |  |
Number of trading days | 5 days |  |  | 5 days |  |  |  |  |
Proportion of voting rights held by related party |  |  |  | 32.60% |  |  |  |  |
Alex Wynaendts [member] |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Shares held in the entity |  |  |  |  |  |  | 544,914 | 494,779 |
Matt Rider [member] |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |  |  |  |  |  |
Shares held in the entity |  |  |  |  |  |  | 42,972 | 20,462 |

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- Definition Number of shares repurchased. + References No definition available. + Details
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- Definition Number of trading days. + References No definition available. + Details
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- Definition Proportion of value weight average price of common shares. + References No definition available. + Details
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- Definition Repurchase of shares. + References No definition available. + Details
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- Definition Percentage that do not exceed outstanding share capital. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 12 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_vi&doctype=Standard -URIDate 2019-03-27 + Details
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