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Current Liabilities - Additional Information (Detail) - Aegon N.V [member] - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of other liabilities [Line Items] |  |
Loans and payable maturity description | Loans from and payables to group companies have a maturity of less than one year. |
Derivatives fair value | € 165 | € 164

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- Definition Derivative fair value amount. + References No definition available. + Details
Name: | aeg_DerivativeFairValueAmount
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of other liabilities. + References No definition available. + Details
Name: | aeg_DisclosureOfOtherLiabilitiesLineItems
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan and payables maturity period description. + References No definition available. + Details
Name: | aeg_LoanAndPayablesMaturityPeriodDescription
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |