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Shareholders' Equity - Schedule of Share Capital Transactions Relating To Common Shares A (Detail) - Common Share [member] - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |
Issuance of common shares with a par value of EUR 0.12 |  |  | 21,099
Final dividend [member] |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |
Dividend | (32,874,000) | (21,954,000) | (26,916,000)
Share buyback program | 32,874,000 | 21,954,000 | 51,865,000
Interim dividend [member] |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |
Dividend | (35,370,000) | (24,134,000) | (24,948,000)
Share buyback program | 43,150,000 | 24,134,000 | 51,865,000

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- Definition Number of common shares + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Repurchase of common shares. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items representing issued share capital and reserves attributable to shareholders. + 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 number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Period Type: |

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