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Critical Accounting Estimates and Judgment in Applying Accounting Policies - Additional Information (Detail) - EUR (€) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of changes in accounting estimates [line items] |  |  |
Increase decrease in earning before tax due to actuarial assumption and model updates | € 196,000,000 | € 121,000,000 |
Uniform grading period | 10-year |  |
Description of voluntary changes | For the years 2017 through 2019, Aegon kept its long-term equity market return assumption for the estimated gross profits on variable life and variable annuity products in the Americas at 8%. During the three year period, the long-term assumption for 10-year US Treasury yields was 4.25% and the uniform grading period was 10 years. Aegon’s assumed returns for US separate account bond funds are 4% over the next 10 years and 6% thereafter. The long term credit spread assumption, net of assumed defaults and expenses, on our most common corporate bonds is 114bps. The 90-day Treasury yield was 1.55%, 2.37% and 1.39% at December 31, 2019, 2018 and 2017, respectively. During the period 2017 to 2019 the 90-day Treasury yield was assumed to have a uniform grading over 10 years to 2.5%. On a quarterly basis, the estimated gross profits are updated for the difference between the estimated market return and the actual market return. |  |
Percentage of increase in mortality assumption | 10.00% |  |
Decrease in net income due to increase of mortality assumption | € 204,000,000 | 207,000,000 |
Percentage of increase in the lapse rate assumption | 20.00% |  |
Increase in net income due to increase in lapse rate assumptions | € 126,000,000 | 89,000,000 |
Interest rate, measurement input [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage increase in inputs of liability adequacy test | 1.00% |  |
Percentage decrease in inputs of liability adequacy test | 1.00% |  |
Aegon N.V [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Decrease in net income due to possible changes in other assumptions | € 13,000,000 | € 9,000,000 |
10-year US treasury yields [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of rate of return | 4.25% |  |
Bonds [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Long term credit spread assumption |  | 1.14% |
Bonds [member] | Grading over 10 years [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of rate of return | 4.00% |  |
Bonds [member] | Grading after 10 years [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of rate of return | 6.00% |  |
90-day treasury yield [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of rate of return | 1.55% | 2.37% | 1.39%
90-day treasury yield [member] | Grading over 10 years [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of rate of return | 2.50% | 2.50% | 2.50%
Americas [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of long-term equity market return assumption | 8.00% |  |
United States [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage of decrease in expected long-term equity growth rate |  | 1.00% |
Decrease in DPAC and VOBA balances and reserve | € 111,000,000 | € 148,000,000 |
DPAC and VOBA balance | 2,700,000,000 | 2,600,000,000 |
United States [member] | Long term care products [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Gross present value reserve margin | € 251,000,000 | 35,000,000 |
Increase in incidence rates resulting in increase of gross present value, percentage | 5.00% |  |
Increase in gross present value reserve after increase in incidence rate | € 178,000,000 | 170,000,000 |
Decrease in incidence rates resulting in decrease of gross present value, percentage | 5.00% |  |
Decrease in gross present value decrease after decrease in incidence rate | € 178,000,000 | 170,000,000 |
Increase in gross present value reserve after removing the morbidity improvement | 535,000,000 | 500,000,000 |
Increase in gross present value reserve related to loss recognition block after removing the morbidity improvement | € 445,000,000 | 425,000,000 |
Percentage of decrease in mortality resulting in gross present value reserve increase | 10.00% |  |
Increase in gross present value reserve after decrease in mortality | € 89,000,000 | 85,000,000 |
Decrease in gross present value reserve after increase in mortality | € 89,000,000 | 85,000,000 |
Percentage of increase in mortality resulting in gross present value reserve decrease | 10.00% |  |
Decrease in gross present value reserve after removing mortality improvement | € 89,000,000 | € 85,000,000 |
The Netherlands [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Liability Adequency Test Deficit | 5,100,000,000 |  |
Loss Recognition | 3,400,000,000 |  |
Net Deficits | € 1,700,000,000 |  |
Liquidity Premium Rate | 0.05% |  |
The Netherlands [member] | Interest rate, measurement input [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Increase of deficit in liability adequacy test | € 4,700,000,000 |  |
Decrease of deficit in liability adequacy test | € 3,500,000,000 |  |
The Netherlands [member] | Credit spread, measurement input [member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage increase in inputs of liability adequacy test | 0.50% |  |
Increase of deficit in liability adequacy test | € 200,000,000 |  |
Decrease of deficit in liability adequacy test | € 200,000,000 |  |
Percentage decrease in inputs of liability adequacy test | 0.50% |  |
The Netherlands [member] | Mortgage Measurement Input [Member] |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |
Percentage increase in inputs of liability adequacy test | 0.50% |  |
Increase of deficit in liability adequacy test | € 600,000,000 |  |
Decrease of deficit in liability adequacy test | € 600,000,000 |  |
Percentage decrease in inputs of liability adequacy test | 0.50% |  |

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