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Defined Benefit Plans - Summary of Estimated Approximate Effects on the Defined Benefit Obligation (Detail) - Aegon Nederland N.V. [member] - EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
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Demographic actuarial assumption on mortality rates by 10% Variation [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in actuarial assumptions | € (100) | € (81)
Decrease in actuarial assumptions | 112 | 90
Financial actuarial assumptions of discount rates by 100 basis points variation [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in actuarial assumptions | (645) | (534)
Decrease in actuarial assumptions | 893 | 733
Finance actuarial assumption on salary increase rate by 100 basis points variation [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in actuarial assumptions | 1 | 18
Decrease in actuarial assumptions |  | (18)
Finance actuarial assumption on indexation rate by 25 basis points variation [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in actuarial assumptions | 194 | 167
Decrease in actuarial assumptions | € (177) | € (152)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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