Share Capital - Additional Information (Detail)	Dec. 31, 2021 EUR (€)
Common Share B [member] \| Aegon N.V [member]
Disclosure of changes in share capital [Line Items]
Nominal value of issued shares	€ 0.12

Disclosure Of Changes In Share Capital [line items]

No definition available.

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