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Share Capital - Disclosure of Weighted Average Number of Common Shares and Common Shares B (Detail) - Aegon N.V [member] - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Common shares [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Weighted average number of common shares | 2,098,326 | 2,095,648
Common share B [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Weighted average number of common shares | 585,022 | 585,022

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- Definition Weighted average number of equity shares. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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