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Current Liabilities - Additional Information (Detail) - Aegon N.V [member] - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of other liabilities [Line Items]
Loans and payable maturity description	Loans from and payables to group companies have a maturity of less than one year.
Derivatives fair value	€ 165	€ 164

X

- Definition

Derivative fair value amount.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of other liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Loan and payables maturity period description.

+ References

No definition available.

+ Details

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

X

- Details

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