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Transfers of Financial Assets - Summary of Carrying Amount of Collateral Pledged and the Corresponding Amounts (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets pledged for general account and contingent liabilities [member]
Disclosure of financial assets [line items]
General account (contingent) liabilities	€ 2,664	€ 4,844
Collateral pledged	3,726	6,694
Net exposure	(1,061)	(1,849)
Non-cash collateral that can be sold or repledged by the counterparty
Assets pledged for repurchase agreements [member]
Disclosure of financial assets [line items]
Cash received on repurchase agreements	719	322
Collateral pledged (transferred financial assets)	718	325
Net exposure		€ (3)

X

- Definition

Cash received on repurchase agreements.

+ References

No definition available.

+ Details

Name:	aeg_CashReceivedOnRepurchaseAgreements
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Collateral pledged.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Collateral pledged (transferred financial assets).

+ References

No definition available.

+ Details

Name:	aeg_CollateralPledgedTransferredFinancialAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net exposure of assets pledged for general account and contingent liabilities.

+ References

No definition available.

+ Details

Name:	aeg_NetExposureOfAssetsPledgedForGeneralAccountAndContingentLiabilities
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net exposure of assets pledged for repurchase agreements.

+ References

No definition available.

+ Details

Name:	aeg_NetExposureOfAssetsPledgedForRepurchaseAgreements
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 15
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_15_a&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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

X

- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=aeg_AssetsPledgedForGeneralAccountAndContingentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: