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Interest Charges and Related Fees - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fee income and expense [abstract] |  |  |
Interest charges accrued on financial assets and liabilities | € 298 | € 143 | € 162

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- Definition Interest expense for financial assets and liabilities not at fair value through profit or loss. + References No definition available. + Details
Name: | aeg_InterestExpenseForFinancialAssetsAndLiabilitiesNotAtFairValueThroughProfitOrLoss
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_FeeIncomeAndExpenseAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration