Interest Charges and Related Fees - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fee income and expense [abstract]
Interest charges accrued on financial assets and liabilities	€ 143	€ 162	€ 176

Interest expense for financial assets and liabilities not at fair value through profit or loss.

No definition available.

Name:	aeg_InterestExpenseForFinancialAssetsAndLiabilitiesNotAtFairValueThroughProfitOrLoss
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration