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Defined Benefit Plans - Additional Information (Detail) € in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 EUR (€) | Sep. 30, 2018 EUR (€) | Dec. 31, 2019 EUR (€) yr Plans | Dec. 31, 2018 EUR (€) yr | Jan. 01, 2018 yr | Dec. 31, 2017 EUR (€)
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Defined benefit plans deficit |  |  | € 388.0 | € (450.0) |  |
Plan benefit liability |  |  | 4,359.0 | 3,989.0 |  | € 3,950.0
Unfunded amount of defined benefit plans |  |  | 2,487.0 | 1,956.0 |  |
Unfunded amount of other post employment defined benefit plans |  |  | 767.0 | € 484.0 |  |
Retirement age | yr |  |  |  | 67 |  |
Defined benefit plan deficit |  |  | (386.0) | € (502.0) |  |
Maximum annual benefit accrual |  |  |  |  | 1.875% |
Aegon United Kingdom [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Defined benefit plan deficit |  |  | 1.5 | 51.0 |  |
Contributions were paid into scheme |  |  | 83.0 | 55.0 |  |
Additional contribution |  |  | 29.0 |  |  |
Defined Benefit Amendment Plan 2019 [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Defined benefit pension plan amount realised |  |  | 101.0 |  |  |
Plan Amendment Average Life Expectancy [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Retirement age | yr |  |  |  |  | 68 |
United States [member] | Supplemental pension and retirement plan [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Defined benefit plans unfunded |  |  | 272.0 | 241.0 |  |
United States [member] | Post employment healthcare benefits [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Plan benefit liability |  |  | € 217.0 | € 210.0 |  |
Aegon United Kingdom [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Remaining average duration of defined benefits obligation | yr |  |  | 21.6 | 21.6 |  |
Percentage of investment assets allocation in primary equities |  |  | 30.00% |  |  |
Percentage of investment liability allocation in fixed interest and inflation-linked bonds and related derivatives |  |  | 70.00% |  |  |
Transamerica Corporation [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Employer contribution to pension plan | € 223.0 | € 190.0 |  |  |  |
Aegon United States of America [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Number of benefit plans | Plans |  |  | 2 |  |  |
Remaining average duration of defined benefits obligation | yr |  |  | 12.6 | 12.2 |  |
Aegon Nederland N.V. [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Remaining average duration of defined benefits obligation | yr |  |  | 12.4 | 11.7 |  |
Unfunded amount of other post employment defined benefit plans |  |  | € 65.0 | € 65.0 |  |
Aegon Nederland N.V. [member] | Unfunded [member] | Life insurance general account [member] |  |  |  |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |  |  |  |
Remaining average duration of defined benefits obligation | yr |  |  | 21.9 | 20.9 |  |
Unfunded amount of defined benefit plans |  |  | € 3,413.0 | € 2,967.0 |  |

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- Definition Additional cash contributions to plan. + References No definition available. + Details
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- Definition Defined benefit contribution paid. + References No definition available. + Details
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- Definition Defined benefit plan target asset allocation percentage. + References No definition available. + Details
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- Definition Defined benefit plan target liability allocation percentage. + References No definition available. + Details
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- Definition Defined benefit plans deficit + References No definition available. + Details
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- Definition Defined benefit unfunded plans. + References No definition available. + Details
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- Definition Maximum annual benefit accrual . + References No definition available. + Details
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- Definition Number of pension plans. + References No definition available. + Details
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- Definition Remaining average duration of defined benefits obligation. + References No definition available. + Details
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- Definition Retirement age. + 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 employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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