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v3.20.1

Schedule V - Valuation and Qualifying Accounts (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of details of valuation and qualifying accounts [line items] |  |  |
Beginning balance | € 179 | € 213 | € 215
Addition charged to earnings | 72 | 35 | 40
Amounts written off and other changes | (53) | (70) | (37)
Currency translation |  | 1 | (5)
Ending balance | 199 | 179 | 213
Mortgages [member] |  |  |
Disclosure of details of valuation and qualifying accounts [line items] |  |  |
Beginning balance | 19 | 48 |
Ending balance | 6 | 19 | 48
Other loans [member] |  |  |
Disclosure of details of valuation and qualifying accounts [line items] |  |  |
Beginning balance | 118 | 116 |
Ending balance | 159 | 118 | 116
Receivables [member] |  |  |
Disclosure of details of valuation and qualifying accounts [line items] |  |  |
Beginning balance | 41 | 48 |
Ending balance | € 34 | € 41 | € 48

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- Definition Valuation allowances and reserves. + References No definition available. + Details
Name: | aeg_ValuationAllowancesAndReserves
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Valuation allowances and reserves charged to earnings. + References No definition available. + Details
Name: | aeg_ValuationAllowancesAndReservesChargedToEarnings
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation allowances and reserves deductions. + References No definition available. + Details
Name: | aeg_ValuationAllowancesAndReservesDeductions
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Valuation allowances and reserves exchange difference on translations of foreign financial statement. + References No definition available. + Details
Name: | aeg_ValuationAllowancesAndReservesExchangeDifferenceOnTranslationsOfForeignFinancialStatements
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=aeg_ProvisionsForMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=aeg_ProvisionsForOtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=aeg_ProvisionsReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |