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Reinsurance Assets - Assets Arising from Reinsurance Contracts (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
--- | --- | --- | --- | ---
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Reinsurance assets | € 20,835 | € 20,507 | [1] | € 19,202
Continuing operation [member] |  |  |  |
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Reinsurance assets | 7,101 | 6,900 |  |
Exit of a business [member] |  |  |  |
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Reinsurance assets | € 13,734 | € 13,606 |  |
[1] | Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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- 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 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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