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Financial Risks - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 EUR (€) Violation Delinquency Issuer Counterparty | Dec. 31, 2018 EUR (€) Violation
Disclosure of financial risk management [line items] |  |
For NHG backed mortgage loans, lender-incurred haircut applied on realized losses on each defaulted loan | 10.00% |
Number of defaults with derivativies counterparty for last three years | Counterparty | 0 |
Number of violation of credit name limit policy at group level | Violation | 2 | 0
Fair value | € 148,570,000,000 | € 139,834,000,000
Net impairments and (recoveries) | (17,000,000) | (10,000,000)
Maximum value of unrealized loss disclosed separately | 25,000,000 |
Securities available-for-sale | 89,404,000,000 | 84,675,000,000
Financial assets at fair value through profit or loss | 9,080,000,000 | 8,597,000,000
Recoveries on previously impaired assets | 66,000,000 | 34,000,000
Amount held in general account investment readily redeemable and saleable | 31,066,000,000 | 32,116,000,000
Undrawn committed borrowing facilities | 3,403,000,000 | 3,680,000,000
Targeted Long Term Refinancing Operations [member] | Asset Purchase Programme [Member] |  |
Disclosure of financial risk management [line items] |  |
Asset purchase programme | € 20,000,000,000 |
Deposit rate | (0.50%) |
Equity portfolio [member] |  |
Disclosure of financial risk management [line items] |  |
Gross unrealized gain (AFS) | € 47,000,000 | 40,000,000
Gross unrealized loss | € 24,000,000 | 20,000,000
Government [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Corporate financial banking sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
REITS sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Capital goods sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Consumer cyclical sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Consumer non cyclical sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Energy sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Technology sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Transportation sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Communications sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Electric sub sector [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Aegon US, NL [member] |  |
Disclosure of financial risk management [line items] |  |
Gross unrealized gain (AFS) | € 10,493,000,000 | 4,370,000,000
Gross unrealized losses AFS debt securities | 327,000,000 | 1,352,000,000
Gross unrealized loss | 24,000,000 | 20,000,000
Aegon Americas and Netherlands [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | 3,332,000,000 | 4,503,000,000
Net impairments and (recoveries) | (17,000,000) | 10,000,000
Recoveries on previously impaired assets | 66,000,000 | 34,000,000
Aegon US, NL [member] |  |
Disclosure of financial risk management [line items] |  |
Impairment release | € 7,000,000 | 4,000,000
Belfius bank SA [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Residential mortgage- backed securities [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | € 2,222,000,000 | 2,102,000,000
Financial assets at fair value through profit or loss | 67,000,000 | 35,000,000
Gross unrealized loss on available-for-sale securities | 18,000,000 | 29,000,000
Net unrealized gains on securities | 284,000,000 | 266,000,000
Residential mortgage- backed securities [member] | Aegon US, NL [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | 2,533,000,000 | 2,497,000,000
Gross unrealized losses RMBS | 18,000,000 | 30,000,000
Net unrealized gains on securities | 288,000,000 | 269,000,000
Residential mortgage- backed securities [member] | Aegon Netherlands [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | 311,000,000 | 395,000,000
Commercial mortgage- backed securities (CMBSs) [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | 3,440,000,000 | 3,349,000,000
Net unrealized gains on securities | € 157,000,000 | 17,000,000
Commercial mortgage- backed securities (CMBSs) [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Commercial mortgage- backed securities (CMBSs) [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | € 3,427,000,000 | 3,314,000,000
Financial assets at fair value through profit or loss | 0 | 0
Net unrealized gains on securities | 104,000,000 | 17,000,000
Gross unrealized losses CMBS | 6,000,000 | 44,000,000
Commercial mortgage- backed securities (CMBSs) [member] | Aegon Netherlands [member] |  |
Disclosure of financial risk management [line items] |  |
Securities available-for-sale | 13,000,000 | 35,000,000
Available for sale bonds [member] | Aegon Americas [member] | Energy sub sector [member] |  |
Disclosure of financial risk management [line items] |  |
Available for sale bonds issued | 3,844,000,000 | 3,592,000,000
Available for sale bonds [member] | Aegon US, NL [member] | Energy sub sector [member] |  |
Disclosure of financial risk management [line items] |  |
Available for sale bonds issued | 3,961,000,000 | 3,802,000,000
Gross unrealized losses Corporate Financial Banking Sub Sector | 62,000,000 | 138,000,000
Net unrealized gain | 367,000,000 | 13,000,000
Available held for sale bonds member [Member] | Aegon Americas [member] | Energy sub sector [member] |  |
Disclosure of financial risk management [line items] |  |
Available for sale bonds issued | 117,000,000 | 211,000,000
Asset backed securities [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | € 0 | 4,503,000,000
Individual issuers rated below investment grade which have unrealised position greater than EUR 25 million | Issuer | 0 |
Asset backed securities [member] | Aegon US, NL [member] |  |
Disclosure of financial risk management [line items] |  |
Gross unrealized losses ABS | € 9,000,000 | 52,000,000
Asset backed securities [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | 2,239,000,000 | 2,626,000,000
Financial assets at fair value through profit or loss | 3,000,000 | 6,000,000
Gross unrealized loss | 5,000,000 | 18,000,000
Asset backed securities [member] | Aegon Netherlands [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | 1,093,000,000 | 1,877,000,000
Gross unrealized loss | 3,000,000 | 34,000,000
Asset backed securities [member] | Aegon Americas and Netherlands [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | 3,332,000,000 | 4,503,000,000
Monoline insurers [member] | Aegon Americas [member] | Asia Portfolios [member] |  |
Disclosure of financial risk management [line items] |  |
Letters of credit /guarantees collateral | € 272,000,000 | € 178,000,000
Monoline insurers [member] | Municipal Bond Insurance Association, Inc. [member] |  |
Disclosure of financial risk management [line items] |  |
Percentage of Indirect Exposure | 6.00% | 15.00%
Monoline insurers [member] | Ambac Financial Group, Inc. [member] |  |
Disclosure of financial risk management [line items] |  |
Percentage of Indirect Exposure | 54.00% | 13.00%
Monoline insurers [member] | Assured Guaranty Corporation [member] |  |
Disclosure of financial risk management [line items] |  |
Percentage of Indirect Exposure | 27.00% | 52.00%
Americas commercial and agricultural mortgage loan portfolio [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | € 9,447,000,000 | € 8,059,000,000
Percentage of loan to value | 53.00% | 54.00%
Assumed defaults rate on delinquent loans | 1.06% | 1.25%
Delinquency days (defined as 60 days in arrears) | Delinquency | 60 |
Net impairments and (recoveries) | € 0 | € 1,000,000
Americas commercial and agricultural mortgage loan portfolio [member] | Foreclosed on impaired loans [member] |  |
Disclosure of financial risk management [line items] |  |
Net impairments and (recoveries) | 0 | 0
Foreclosure and recoveries |  | 0
Netherlands Mortgage Loan Portfolio [member] |  |
Disclosure of financial risk management [line items] |  |
Fair value | € 33,111,000,000 | € 31,686,000,000
Percentage of loan to value | 67.00% | 70.00%
Assumed defaults rate on delinquent loans | 0.10% | 0.20%
Delinquency days (defined as 60 days in arrears) | Delinquency | 60 |
Percentage of loan portfolio guaranteed by government | 49.00% | 46.00%
Impairment release | € 0 | € 0
Percentage of average default of portfolio | 0.05% |
Bottom of range [member] |  |
Disclosure of financial risk management [line items] |  |
Net impairments and (recoveries) | € 25,000,000 | € 25,000,000
Fed funds rate | 1.00% |
Unrealized loss position period | 6 months |
Bottom of range [member] | Government bonds [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss positions | € 25,000,000 |
Bottom of range [member] | Investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss positions | 25,000,000 |
Bottom of range [member] | Below investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | 25,000,000 |
Bottom of range [member] | Energy sub sector [member] | Below investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss positions | 25,000,000 |
Bottom of range [member] | Transportation sub sector [member] | Below investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | 25,000,000 |
Bottom of range [member] | Communications sub sector [member] | Below investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | 25,000,000 |
Bottom of range [member] | Electric sub sector [member] | Below investment grade [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | € 25,000,000 |
Bottom of range [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Assumed defaults rate on delinquent loans | 0.00% |
Prepayment assumptions | 0.00% |
Percentage of loss severity assumption | 0.00% |
Bottom of range [member] | Belfius bank SA [member] |  |
Disclosure of financial risk management [line items] |  |
Gross unrealized loss | € 25,000,000 |
Bottom of range [member] | Commercial mortgage- backed securities (CMBSs) [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | 25,000,000 |
Bottom of range [member] | Asset backed securities [member] |  |
Disclosure of financial risk management [line items] |  |
Unrealized loss | € 25,000,000 |
Top of range [member] |  |
Disclosure of financial risk management [line items] |  |
Rate of fair value of investment | Significant or prolonged decline is generally defined within Aegon as an unrealized loss position for more than six months or a fair value of less than 80% of the cost price of the investment. |
Top of range [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Assumed defaults rate on delinquent loans | 56.00% |
Prepayment assumptions | 33.00% |
Percentage of loss severity assumption | 105.00% |
Weighted average [member] | Aegon Americas [member] |  |
Disclosure of financial risk management [line items] |  |
Assumed defaults rate on delinquent loans | 8.44% | 5.45%
Prepayment assumptions | 20.42% |
Percentage of loss severity assumption | 50.19% | 56.96%

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