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Other Equity Instruments - Summary of Coupon Details - Summary of Perpetual Contingent Convertible (Parenthetical) (Detail) - EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
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EUR 500 million [member] | Aegon N.V [member] | Perpetual contingent convertible securities [member] |  |
Disclosure of other equity instruments [line items] |  |
Principal amount | € 500,000,000 | € 500,000,000

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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