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Deferred Tax - Summary of Deferred Tax (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Dec. 31, 2017
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences € 193 € 125    
Deferred tax liabilities, temporary differences 1,227 529    
Deferred tax assets 193 125 [1] € 79  
Deferred tax liabilities 1,227 529 [1] € 1,021  
Total net deferred tax liability / (asset) 1,035 394   € 942
Real estate [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences (520)      
Deferred tax liabilities, temporary differences 124 520    
Total net deferred tax liability / (asset) 644 519   554
Financial assets [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences 76 (7)    
Deferred tax liabilities, temporary differences 1,549 807    
Total net deferred tax liability / (asset) 1,473 814   1,737
Insurance and investment contracts [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences 440      
Deferred tax liabilities, temporary differences (1,031) (1,433)    
Total net deferred tax liability / (asset) (1,471) (1,434)   (1,787)
Deferred expenses, VOBA and other intangible assets [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences (112) (125)    
Deferred tax liabilities, temporary differences 1,663 1,788    
Total net deferred tax liability / (asset) 1,775 1,914   1,892
Defined benefit plans [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences 7 12    
Deferred tax liabilities, temporary differences (249) (257)    
Total net deferred tax liability / (asset) (256) (269)   (295)
Tax losses and credits carried forward [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences 183 167    
Deferred tax liabilities, temporary differences (551) (147)    
Other [member]        
Deferred tax assets and liabilities [Line Items]        
Deferred tax assets, temporary differences 119 79    
Deferred tax liabilities, temporary differences (279) (748)    
Total net deferred tax liability / (asset) € (398) € (827)   € (863)
[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.