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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