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Condensed Financial Information of Registrant - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed financial information of registrant [line items]
Dividends	€ 120	€ 94
Aegon N.V [member] | Business combinations [member]
Condensed financial information of registrant [line items]
Dividends	1,200	1,400	€ 1,800
Capital contributions	€ 400	€ 100	€ 1,100

X

- Definition

Capital contribution.

+ References

No definition available.

+ Details

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

X

- Definition

Condensed financial information of registrant [line items]

+ References

No definition available.

+ Details

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

X

- Definition

The amount of dividends received.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph B12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DividendsReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

Name:	ifrs-full_BusinessCombinationsAxis=ifrs-full_BusinessCombinationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: