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Reinsurance Assets - Summary of Reinsurance Assets Relating to Life Insurance (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of types of insurance contracts [Line Items]    
Beginning balance [1] € 20,507  
Ending balance 20,835 € 20,507 [1]
Life insurance general account [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 18,712 17,419
Gross premium and deposits - existing and new business 2,170 2,038
Unwind of discount / interest credited 887 860
Insurance liabilities released (3,028) (2,518)
Fund charges released (85) (82)
Changes to valuation of expected future benefits (16) 109
Policy transfers   25
Net exchange differences 369 858
Transfer to/from insurance contracts 22  
Other movements 16 2
Ending balance 19,046 18,712
Life insurance for account of policyholders [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 2 2
Gross premium and deposits - existing and new business   3
Insurance liabilities released   (3)
Disposal of a business (2)  
Ending balance   2
Insurance [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 18,714 17,421
Gross premium and deposits - existing and new business 2,170 2,041
Unwind of discount / interest credited 887 860
Insurance liabilities released (3,028) (2,521)
Fund charges released (85) (82)
Changes to valuation of expected future benefits (16) 109
Policy transfers   25
Net exchange differences 369 858
Disposal of a business (2)  
Transfer to/from insurance contracts 22  
Other movements 16 2
Ending balance € 19,046 € 18,714
[1] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.