Reinsurance Assets - Summary of Reinsurance Assets Relating to Life Insurance (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Disclosure of types of insurance contracts [Line Items]
Beginning balance	€ 20,992
Ending balance	21,184	€ 20,992
Life insurance general account [member]
Disclosure of types of insurance contracts [Line Items]
Beginning balance	19,409	17,421
Gross premium and deposits – existing and new business	1,635	1,825
Unwind of discount / interest credited	1,115	828
Insurance liabilities released	(3,562)	(1,890)
Fund charges released	(252)	(83)
Changes to valuation of expected future benefits	(138)	(38)
Net exchange differences	1,201	1,342
Transfer to/from insurance contracts	(2)	2
Transfers to disposal groups	0
Other movements	190	1
Ending balance	€ 19,595	€ 19,409

Increase decrease through fund charges released reinsurance assets.

No definition available.

Name:	aeg_IncreaseDecreaseThroughFundChargesReleasedReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase decrease through gross premium and deposits existing and new business reinsurance assets.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughGrossPremiumAndDepositsExistingAndNewBusinessReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase decrease through insurance liabilities released reinsurance assets.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughInsuranceLiabilitiesReleasedReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase decrease through other movements reinsurance assets.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughOtherMovementsReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase decrease through transfers to disposal groups reinsurance assets.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughTransfersToDisposalGroupsReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase (decrease) through transfers with insurance contracts.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughTransfersWithInsuranceContracts
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase decrease through unwind of discount interest credited reinsurance assets.

+ References

No definition available.

+ Details

Name:	aeg_IncreaseDecreaseThroughUnwindOfDiscountInterestCreditedReinsuranceAssets
Namespace Prefix:	aeg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The increase (decrease) in reinsurance assets resulting from adjustments arising from the passage of time. [Refer: Reinsurance assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 4
-IssueDate 2022-03-24
-Paragraph 37
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_e&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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

- Definition

The increase (decrease) in reinsurance assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Reinsurance assets]

+ References

+ Details

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

- Definition

The amount of a cedant’s net contractual rights under a reinsurance contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 4
-IssueDate 2022-03-24
-Paragraph 37
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_e&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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

- Details

Name:	ifrs-full_TypesOfInsuranceContractsAxis=ifrs-full_LifeInsuranceContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: