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Insurance Contracts - Summary of Insurance Contracts for General Account (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
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Disclosure of insurance contracts for general account [Line Items] |  |  |  |  |
- Unearned premiums and unexpired risks | € 6,002 | € 5,341 |  |  |
- Outstanding claims | 2,417 | 2,338 |  |  |
- Incurred but not reported claims | 772 | 820 |  |  |
Incoming reinsurance | 4,385 | 4,377 |  |  |
- Accident and health insurance | 123,454 | 115,328 | [1] | € 110,848 |
Non-life insurance [member] |  |  |  |  |
Disclosure of insurance contracts for general account [Line Items] |  |  |  |  |
- Accident and health insurance | 9,190 | 8,499 |  |  | € 8,484
Non-life insurance [member] | Accident and health insurance [member] |  |  |  |  |
Disclosure of insurance contracts for general account [Line Items] |  |  |  |  |
- Accident and health insurance | 8,955 | 8,247 |  |  |
Non-life insurance [member] | General insurance [member] |  |  |  |  |
Disclosure of insurance contracts for general account [Line Items] |  |  |  |  |
- Accident and health insurance | 235 | 252 |  |  |
Life insurance general account [member] |  |  |  |  |
Disclosure of insurance contracts for general account [Line Items] |  |  |  |  |
- Accident and health insurance | € 109,879 | € 102,452 |  |  | € 98,452
[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 liability for insured events that have occurred but for which claims have yet not been reported by policyholders. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph IG22 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG22_c&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount of liability for claims reported by policyholders as the result of the occurrence of insured events. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph IG22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG22_b&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities under insurance contracts and reinsurance contracts issued. [Refer: Types of insurance contracts [member]] + 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 b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph IG20 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG20_a&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph IG37 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG37_a&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-b&anchor=para_55&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount of liability for written premiums on insurance contracts that have not yet been earned. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph IG22 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG22_a&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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