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Financial Risks - Additional Information (Detail)
 12 Months Ended
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%