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Interest Charges and Related Fees - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	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