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Condensed Financial Information of Registrant - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed financial information of registrant [line items] |  |  |
Dividends | € 120 | € 94 |
Aegon N.V [member] | Business combinations [member] |  |  |
Condensed financial information of registrant [line items] |  |  |
Dividends | 1,200 | 1,400 | € 1,800
Capital contributions | € 400 | € 100 | € 1,100

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- Definition Capital contribution. + 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 Condensed financial information of registrant [line items] + 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 The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
Name: | ifrs-full_DividendsReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=ifrs-full_BusinessCombinationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |