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Transfers of Financial Assets - Summary of Carrying Amount of Financial Assets (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Available-for-sale financial assets [member] | Shares [member] |  |
Disclosure of financial assets [line items] |  |
Carrying amount of transferred assets | € 144 | € 81
Carrying amount of associated liabilities | 155 | 91
Available-for-sale financial assets [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Carrying amount of transferred assets | 3,127 | 3,310
Carrying amount of associated liabilities | 3,304 | 3,396
Financial assets at fair value through profit or loss [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Carrying amount of transferred assets | 20 | 404
Carrying amount of associated liabilities | 21 | 416
Financial assets at fair value through profit or loss [member] | Investment contracts for account of policyholders [member] |  |
Disclosure of financial assets [line items] |  |
Carrying amount of transferred assets | 161 | 249
Carrying amount of associated liabilities | € 4 | € 69

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- Definition Carrying amount of associated liabilities. + References No definition available. + Details
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Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of transferred assets. + References No definition available. + Details
Name: | aeg_CarryingAmountOfTransferredAssets
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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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
Name: | ifrs-full_ClassesOfAssetsAxis=aeg_SharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_DebtSecuritiesMember
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_ClassesOfAssetsAxis=aeg_InvestmentsForAccountOfPolicyholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |