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Deferred Expenses - Summary of Deferred Costs Arising From Insurance Contracts (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items]    
Beginning balance [1] € 115,328  
Ending balance 123,454 € 115,328 [1]
DPAC [member]    
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items]    
Beginning balance 10,457 9,688
Costs deferred during the year 807 802
Amortization through income statement (754) (914)
Shadow accounting adjustments (656) 455
Impairments (65)  
Net exchange differences 223 433
Disposal of group assets (35)  
Other (5) (7)
Ending balance 9,972 10,457
Deferred costs of reinsurance [member]    
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items]    
Beginning balance 23 41
Costs deferred during the year  
Amortization through income statement 17 (19)
Shadow accounting adjustments  
Net exchange differences   1
Ending balance 389 23
Deferred transaction costs [member]    
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items]    
Beginning balance 431 406
Costs deferred during the year 24 29
Amortization through income statement (22) (23)
Net exchange differences 9 18
Ending balance € 442 € 431
[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.