Fair Value - Information about Significant Unobservable Inputs (Parenthetical) (Detail) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives [member] \| Level III [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Investments for account of policyholders	€ 1	€ 0

Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]

No definition available.

Name:	aeg_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsAndLiabilitiesLineItems
Namespace Prefix:	aeg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration