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Transfers of Financial Assets - Additional Information (Detail) - EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of financial assets [line items] |  |
Transferred financial assets with continuing involvement that are derecognized in their entirely | € 0 | € 0
Amount of collateral pledged for derivative transactions | 2,400,000,000 | 1,400,000,000
The Netherlands [member] |  |
Disclosure of financial assets [line items] |  |
Mortgage loan pledged as security for notes issued | € 5,500,000,000 | € 6,000,000,000

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- Definition Carrying value of transferred financial assets that are not derecognised in their entirety. + References No definition available. + Details
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Namespace Prefix: | aeg_
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Balance Type: | debit
Period Type: | instant

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- Definition Collateral pledged for derivative transactions. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage loans pledged as collateral. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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Data Type: | xbrli:stringItemType
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- Details
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Data Type: | na
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