Number of shares repurchased.

No definition available.

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- Definition

Number of trading days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Proportion of value weight average price of common shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Repurchase of shares.

+ References

No definition available.

+ Details

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

- Definition

Percentage that do not exceed outstanding share capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2019-01-01
-Paragraph 17
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-URIDate 2019-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph 12
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_d&doctype=Standard
-URIDate 2019-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 79
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_vi&doctype=Standard
-URIDate 2019-03-27

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=aeg_SeverancePaymentMember
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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- Details

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Related Party Transactions - Additional Information (Detail) - EUR (€)							12 Months Ended
	Dec. 23, 2019	May 17, 2019	May 18, 2018	Dec. 19, 2017	Jun. 23, 2017	May 19, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [Line Items]
Proportion of voting rights held by related party	32.60%
Shares held in the entity							38,210	48,210
Shares held in the entity that do not exceed the total of outstanding share capital, percentage							1.00%
Key Management [Member]
Disclosure of transactions between related parties [Line Items]
Fixed Compensation Amount							€ 26,400,000	€ 21,500,000	€ 19,400,000
severance payment [Member] \| Key Management [Member]
Disclosure of transactions between related parties [Line Items]
Fixed Compensation Amount							€ 717,000
Vereniging Aegon [member] \| Common shares B [member]
Disclosure of transactions between related parties [Line Items]
Number of shares repurchased	13,227,120	1,773,680	1,489,200	13,042,592	13,042,612	1,979,260
Proportion of value weight average price of common shares of 5 trading days	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Number of shares repurchased, value	€ 1,384,046			€ 1,725,169
Number of trading days	5 days			5 days
Proportion of voting rights held by related party				32.60%
Alex Wynaendts [member]
Disclosure of transactions between related parties [Line Items]
Shares held in the entity							544,914	494,779
Matt Rider [member]
Disclosure of transactions between related parties [Line Items]
Shares held in the entity							42,972	20,462