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Shareholders' Equity - Schedule of Share Capital Transactions Relating To Common Shares A (Parenthetical) (Detail) | Dec. 31, 2017 € / shares
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Common Share [member] | Interim dividend [member] |
Summary of issued share capital and reserves attributable to shareholders [line items] |
Common shares issuance, par value | € 0.12

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- Definition Line items representing issued share capital and reserves attributable to shareholders. + References No definition available. + Details
Name: | aeg_SummaryOfIssuedShareCapitalAndReservesAttributableToShareholdersLineItems
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=aeg_CommonShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=aeg_InterimDividendsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |