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Share Capital - Disclosure of Weighted Average Number of Common Shares and Common Shares B (Detail) - Aegon N.V [member] - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common shares [member]
Disclosure of classes of share capital [Line Items]
Weighted average number of common shares	2,098,326	2,095,648
Common share B [member]
Disclosure of classes of share capital [Line Items]
Weighted average number of common shares	585,022	585,022

X

- Definition

Weighted average number of equity shares.

+ References

No definition available.

+ Details

Name:	aeg_WeightedAverageNumberOfEquityShares
Namespace Prefix:	aeg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=aeg_CommonBSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: