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Commitments and Contingencies - Additional Information (Detail) $ in Thousands, € in Millions, £ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 EUR (€) | Mar. 31, 2019 USD ($) | Nov. 30, 2018 Customer | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2013 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 EUR (€) | [1] | Dec. 31, 2017 EUR (€)
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net charge to income statement |  |  |  | € 214 |  |  |  |  | € 320 | [1] |  | € 210 |
Litigation preliminary settlement amount granted by court |  |  |  |  |  |  | € 25 |  |  |  |  |  |
Other provisions |  |  |  | 214 |  |  |  |  | 320 |  |  |  | € 210
Guarantees Cancelled |  |  |  | € 0 |  |  |  |  |  |  |  |  |
Sale of stock, consideration received | € 295 |  |  |  |  |  |  |  |  |  |  |  |
Litigation provision [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net charge to income statement | $ |  |  |  |  |  |  |  |  |  |  | $ 166,000 |  |
Policy holders objected to settlement |  |  |  | 99.00% | 99.00% |  |  |  |  |  |  |  |
Policy holders opting out of settlement |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |
Opted out shareholders value in Settlement fund |  |  |  | 43.00% | 43.00% |  |  |  |  |  |  |  |
Other provisions |  |  |  | € 14 |  |  |  |  |  |  |  |  |
Provision for unclaimed property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions | $ |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Transamerica Corporation [member] | LTCG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligations payment amount | $ |  | $ 390,000 |  |  |  |  |  |  |  |  |  |  |
Atos BPS Ltd [member] | Aegon United Kingdom [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligations transition and conversion charges | £ |  |  |  |  |  | £ 60 |  |  |  |  |  |  |
Contractual obligations period |  |  |  | Next three years | Next three years |  |  |  |  |  |  |  |
Contract agreement term |  |  |  | 15-year | 15-year |  |  |  |  |  |  |  |
Number of customers | Customer |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |
Aegon N.V [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net charge to income statement |  |  |  |  |  |  |  |  | 10 |  |  |  |
Transamerica Corporation [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Alleged actual damages andpre-judgment interest | $ |  |  |  |  | $ 120,000 |  |  |  |  |  |  |  |
Amount of damages and interest | $ |  |  |  |  | $ 235 |  |  |  |  |  |  |  |
Contractual dispute period, description |  |  |  | A former subsidiary of Transamerica Corporation was involved in a contractual dispute with a Nigerian travel broker that arose in 1976. That dispute was resolved in Delaware court for USD 235 thousand plus interest in 2010. The plaintiff took the Delaware judgment relating to the 1976 dispute to a Nigerian court and alleged that it was entitled to approximately the same damages for 1977 through 1984 despite the absence of any contract relating to those years. The Nigerian trial court issued a judgment in favor of the plaintiff of the alleged actual damages as well as pre-judgment interest of approximately USD 120 million. On appeal this decision was reversed on procedural grounds and remanded back to the trial court which ruled to dismiss the case; however, the Plaintiff appealed the trial court’s ruling. The appeal is still pending. Aegon has no material assets located in Nigeria. | A former subsidiary of Transamerica Corporation was involved in a contractual dispute with a Nigerian travel broker that arose in 1976. That dispute was resolved in Delaware court for USD 235 thousand plus interest in 2010. The plaintiff took the Delaware judgment relating to the 1976 dispute to a Nigerian court and alleged that it was entitled to approximately the same damages for 1977 through 1984 despite the absence of any contract relating to those years. The Nigerian trial court issued a judgment in favor of the plaintiff of the alleged actual damages as well as pre-judgment interest of approximately USD 120 million. On appeal this decision was reversed on procedural grounds and remanded back to the trial court which ruled to dismiss the case; however, the Plaintiff appealed the trial court’s ruling. The appeal is still pending. Aegon has no material assets located in Nigeria. |  |  |  |  |  |  |  |
Transamerica Corporation [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due and punctual payment of payables due under letter of credit agreements |  |  |  | € 1,666 |  |  |  |  | 3,164 |  |  |  |
Transamerica Corporation [member] | Aegon N.V [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due and punctual payment of payables due under letter of credit agreements |  |  |  | 1,666 |  |  |  |  | 3,164 |  |  |  |
Transamerica Corporation [member] | TLIC Riverwood Reinsurance Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments of reinsurance obligations from subsidiary to third party |  |  |  |  |  |  |  |  | 1,892 |  |  |  | € 1,793
Transamerica Corporation and Commonwealth General Corporation [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due and punctual payment of payables due under letter of credit agreements |  |  |  | 2,249 |  |  |  |  | 3,469 |  |  |  |
Transamerica Corporation and Commonwealth General Corporation [member] | Aegon N.V [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due and punctual payment of payables due under letter of credit agreements |  |  |  | 2,249 |  |  |  |  | 3,469 |  |  |  |
Subsidiaries [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Securities and notes issued under commercial paper program |  |  |  | 0 |  |  |  |  | 614 |  |  |  |
Subsidiaries [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other letter of credit agreements |  |  |  |  |  |  |  |  | 60 |  |  |  |
Securities and notes issued under commercial paper program |  |  |  | 0 |  |  |  |  |  |  |  |  |
Subsidiaries [member] | Aegon N.V [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Securities and notes issued under commercial paper program |  |  |  | 1,449 |  |  |  |  | 614 |  |  |  |
Subsidiaries [member] | Aegon N.V [member] | Guarantees [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other letter of credit agreements |  |  |  | € 10 |  |  |  |  | € 60 |  |  |  |
[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 for details about this change.

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- Definition Actual damages and pre judgement interest. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Agreement to service and administer existing business, number of customers + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of damages and interest identified. + References No definition available. + Details
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Balance Type: | credit
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- Definition Bonds capital trust pass through securities and notes issued under commercial paper program. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract agreement term. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual dispute period description. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Contractual Obligations payment amount. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contractual obligations period. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual obligations transition and conversion charges. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of commitments and contingencies. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Guarantees cancelled + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Letter of credit arrangements. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Litigation preliminary settlement amount granted by court. + References No definition available. + Details
Name: | aeg_LitigationPreliminarySettlementAmountGrantedByCourt
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loss contingency settlement agreement plaintiffs objection percentage. + References No definition available. + Details
Name: | aeg_LossContingencySettlementAgreementPlaintiffsObjectionPercentage
Namespace Prefix: | aeg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | aeg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Other letter of credit arrangements. + References No definition available. + Details
Name: | aeg_OtherLetterOfCreditArrangements
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Provision recognized on litigation, percentage. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Reinsurance cash payment obligations. + References No definition available. + Details
Name: | aeg_ReinsuranceCashPaymentObligations
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Sale of stock, consideration received. + References No definition available. + Details
Name: | aeg_SaleOfStockConsiderationReceived
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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Balance Type: | credit
Period Type: | instant

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