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v3.20.1

Fair Value - Additional Information (Detail) - EUR (€) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Amount of assets and liabilities transferred to Level III | € 263,000,000 | € 151,000,000
Transferred of financial instruments from Level III to other levels of the fair value hierarchy | 517,000,000 | 382,000,000
Available-for-sale (AFS) | € 89,404,000,000 | € 84,675,000,000
Weighted average own credit spread used in the valuations of embedded derivatives in insurance contracts | 0.00% | 0.30%
Discount rates converge linearly | 10 years |
Uniform last liquid point for all Aegon's major currencies (EUR, USD and GBP) | 30 years |
United States [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Ultimate forward rate | 4.25% |
The Netherlands [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Ultimate forward rate | 3.65% |
Loans [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Financial assets designated at fair value through profit or loss | € 0 |
Credit spread [member] | Weighted average [member] | Corporate bonds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Interest rate | 0.00% | 3.40%
Tax credit investments [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Discount rate used in valuation of tax credit investments | 0.00% | 6.80%
Net asset value [member] | Recurring fair value measurement [member] | Federal Home Loan Bank shares [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Available-for-sale (AFS) | € 91,000,000 | € 176,000,000

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