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Guarantees in Insurance Contracts - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013 | Dec. 31, 1999 | Dec. 31, 2017
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Period of which return of premium guarantee payable |  | 14 years |  |  |
Re insured account value | € 2,434 | € 2,663 |  |  | € 3,431
Guaranteed remaining balance | € 1,100 | 1,100 |  |  |
Derivative insurance contract description | Aegon entered into a derivative program to mitigate the overall exposure to equity market and interest rate risks associated with the reinsurance contract. This program involves selling equity futures contracts and equity total return swap contracts (S&P 500, Midcap, Russell 2000, and the MCSI EAFE index in accordance with Aegon's exposure) to mitigate the effect of equity market movement on the reinsurance contract and the purchase of interest rate swaps, treasury futures and treasury forwards to mitigate the effect of movements in interest rates on the reinsurance contracts. |  |  |  |
Fixed annuity product balance | € 234 | 243 |  |  |
Increase (decrease) in guarantee reserves | 1,937 | (1,081) |  |  |
Guarantee reserve | 9,645 | 7,708 |  |  |
GMWB [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Derivative contract value | 37 | 36 |  |  |
Reinsurance assets [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Re insured account value | € 1,800 | € 1,700 |  |  |
First five years [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Long-term forward interest rate assumption | 25.00% |  |  |  |
Maturity year 2020 [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Volatility assumption of S&P 500 index |  | 23.30% |  |  |
The Netherlands [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Older generation guarantee, percentage | 4.00% |  |  |  |
Percentage of guarantee decreased |  |  | 0.00% | 3.00% |
The Netherlands [member] | Minimum investment return guaranteed [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Guarantees profit sharing maximum, percentage | 0.00% |  |  |  |
Contract period | 5 years |  |  |  |
Guarantees fair value contributes net loss before tax earnings | € 424 | € 56 |  |  |
Guarantee reserve contributed before tax | 1,840 | 527 |  |  |
Gain (Loss) related to increasing own credit spreads | (42) | 148 |  |  |
Gain related to increase in equity market | (1,585) | (532) |  |  |
Gain related to decreases in equity volatilities | (12) | (8) |  |  |
Increase in risk free rates | 3,281 | 32 |  |  |
Other contributed gain (loss) | € 273 | € (233) |  |  |
The Netherlands [member] | Bottom of range [member] | Minimum investment return guaranteed [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Adjusted technical interest rates | 3.00% |  |  |  |
Effective interest rate percentage | 0.00% |  |  |  |
The Netherlands [member] | Top of range [member] | Minimum investment return guaranteed [member] |  |  |  |  |
Disclosure of insurance contracts contractual obligations [Line Items] |  |  |  |  |
Adjusted technical interest rates | 4.00% |  |  |  |

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- Definition Adjusted technical interest rates. + References No definition available. + Details
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- Definition Assumption of expected volatility insurance contracts percentage. + References No definition available. + Details
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- Definition Derivative contract value. + References No definition available. + Details
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- Definition Disclosure of insurance contracts contractual obligations. + References No definition available. + Details
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- Definition Effective interest rate. + References No definition available. + Details
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- Definition Equity volatility long term forward interest rate percentage. + References No definition available. + Details
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- Definition Fixed annuities product balance. + References No definition available. + Details
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- Definition Gain loss on decrease in equity volatilities. + References No definition available. + Details
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- Definition Guarantee fair value of earning before tax. + References No definition available. + Details
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- Definition Guarantee reserve. + References No definition available. + Details
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- Definition Guaranteed profit sharing maximum, percentage. + References No definition available. + Details
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- Definition Guaranteed remaining balance on reinsurance ceded. + References No definition available. + Details
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- Definition Increase (decrease) in guarantee reserves. + References No definition available. + Details
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- Definition Older generation guarantee, percentage. + References No definition available. + Details
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- Definition Adjustments for fair value losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_20_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets under reinsurance contracts in which the entity is the policyholder. + 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 IG20 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_IG20_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 Reference 3: 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 explanation of the effect of changes in assumptions to measure insurance assets and insurance liabilities, showing separately the effect of each change that has a material effect on the financial statements. + 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 d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_d&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The gains (losses) recognised in other comprehensive income on change in value of foreign currency basis spreads, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_b&doctype=Standard -URIDate 2019-03-27 + Details
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