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Reinsurance Assets - Summary of Reinsurance Assets Relating to Non-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]
Non-life insurance [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 1,356 1,327
Gross premium and deposits - existing and new business 99 84
Unwind of discount / interest credited 88 84
Insurance liabilities released (127) (123)
Changes in unearned premiums (30) (28)
Incurred related to current year 80 77
Incurred related to prior years 56 36
Release for claims settled current year (23) (18)
Release for claims settled prior years (124) (130)
Change in IBNR (19) 12
Shadow accounting adjustment   (24)
Net exchange differences 25 65
Other movements (4) (8)
Ending balance € 1,376 € 1,356
[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.