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Intangible Assets - Additional Information (Detail) - EUR (€) € in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Intangible assets pledged as security for liabilities |  | € 0 |
Description on key assumptions used |  | Other key assumptions used for the calculation were pre-tax risk adjusted discount rate of ranging between 9.1%-14.0% (2017: 8.3%-14.6%), new business contribution, renewals, asset fees, investment return, persistency and expenses. Operating assumptions are best estimate assumptions and based on historical data where available. Economic assumptions are based on observable market data and projections of future trends. |
Existing business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Description of period for projected cash flows |  | Value in use has been determined based on a business plan covering a period of typically 3 years, that, in certain instances was further extrapolated to 20 years |
New business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Description of period for projected cash flows |  | The new business levels for years 4-20 assumed a growth rate based on the business plan of the third year |
Assumed growth rate extrapolated based on business plan |  | 20.00% | 20.00%
Top of range [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Pre-tax adjusted discount rate |  | 25.20% | 28.50%
Intangible assets expected future term based on premium earned |  | 80 years |
Top of range [member] | Existing business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Period for cash flows projection |  | 20 years |
Bottom of range [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Pre-tax adjusted discount rate |  | 8.60% | 9.10%
Intangible assets expected future term based on premium earned |  | 50 years |
Bottom of range [member] | Existing business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Period for cash flows projection |  | 3 years |
United States [member] | Annuities cash generating units [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Recoverable amount of assets - cash generating unit |  | € 127 | € 127
Pre-tax adjusted discount rate |  | 17.00% |
United States [member] | Retirement plans cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Recoverable amount of assets - cash generating unit |  | € 56 | € 55
Pre-tax adjusted discount rate |  | 18.00% |
United States [member] | Existing business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Description of period for projected cash flows |  | Assume business plans covering a period of three years further extrapolated to ten years |
United States [member] | New business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Description of period for projected cash flows |  | New business levels for years 4-10 |
Assumed growth rate extrapolated based on business plan |  | 0.00% | 0.00%
United States [member] | Top of range [member] | New business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Period for cash flows projection |  | 10 years |
United States [member] | Bottom of range [member] | Existing business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Period for cash flows projection |  | 3 years |
United States [member] | Bottom of range [member] | New business cash generating unit [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Period for cash flows projection |  | 4 years |
Future servicing rights [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Average amortization period |  | 30 years |
Remaining average amortization period |  | 15 years | 13 years
Software [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Average amortization period |  | 3 to 5 years |
Remaining average amortization period |  | 4 years | 4 years
Goodwill [member] | Robidus [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Acquisitions through business combinations | € 85 |  |
Pre-tax adjusted discount rate |  | 8.20% |
Assumed growth rate extrapolated based on business plan |  | 2.00% |
Post-tax adjusted discount rate |  | 8.10% |
Goodwill [member] | Aegon Netherlands [member] | Robidus [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Description of period for projected cash flows |  | five years |
Other [member] | Robidus [member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Acquisitions through business combinations | € 33 |  |

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