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Investments - Summary of Movement on Loan Allowance Account (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Changes In Allowance For Loan Losses [abstract] |  |
Beginning balance | € (138) | € (165)
Addition charged to income statement | (76) | (35)
Reversal to income statement | 5 | 3
Amounts written off | 44 | 40
Net exchange differences |  | (1)
Other |  | 20
Ending balance | € (165) | € (138)

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- Definition Allowance for loan losses exchange rate differences. + References No definition available. + Details
Name: | aeg_AllowanceForLoanLossesExchangeRateDifferences
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowances for loan losses, additions charged to profit (loss). + References No definition available. + Details
Name: | aeg_AllowancesForLoanLossesAdditionsChargedToProfitLoss
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowances for loan losses beginning balance. + References No definition available. + Details
Name: | aeg_AllowancesForLoanLossesBeginningBalance
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance for doubtful debts ending balance. + References No definition available. + Details
Name: | aeg_AllowancesForLoanLossesEndingBalance
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowances for loan losses recoveries other changes. + References No definition available. + Details
Name: | aeg_AllowancesForLoanLossesRecoveriesOtherChanges
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowances for loan losses, reversal charged to profit (loss). + References No definition available. + Details
Name: | aeg_AllowancesForLoanLossesReversalChargedToProfitLoss
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in allowance for loan losses write offs. + References No definition available. + Details
Name: | aeg_ChangeInAllowanceForLoanLossesWriteOffs
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of changes In allowance for loan losses. + References No definition available. + Details
Name: | aeg_DisclosureOfChangesInAllowanceForLoanLossesAbstract
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration