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Financial Risks - Summary of Length of Time Security and Respective Realized Loss (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of available for sale securities [line items]
Debt securities	€ (66)	€ (378)
Not later than 1 year [member]
Disclosure of available for sale securities [line items]
Debt securities	(32)	(145)
> 12 months [member]
Disclosure of available for sale securities [line items]
Debt securities	€ (34)	€ (233)

X

- Definition

Available for sale debt securities realized losses.

+ References

No definition available.

+ Details

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

X

- Definition

Line item stands for disclosure of available for sale securities.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: