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Significant Accounting Policies - Summary of Reconciliation Between IFRS and IFRS-EU (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
 [2]
Dec. 31, 2016
Disclosure of changes in accounting estimates [line items]          
Equity € 24,441 € 22,542 [1] € 24,079 [2] € 24,079 € 24,341
Shareholders' equity, adjustment of EU 'IAS 39' carve-out 774 399 368    
Shareholders' equity, tax effect of the adjustment (167) (81) (83)    
Shareholders' equity, effect of the adjustment after tax 607 318 285    
Net income, adjustment of EU 'IAS 39' carve-out 375 31 (142)    
Net income, tax effect of the adjustment (86) 3 34    
Net income, effect of the adjustment after tax 289 34 (108)    
In accordance with IFRS [member]          
Disclosure of changes in accounting estimates [line items]          
Equity 21,850 19,200 20,266    
Net income 1,239 711 2,469    
In accordance with IFR5-EU [member]          
Disclosure of changes in accounting estimates [line items]          
Equity 22,457 19,518 20,550    
Net income € 1,528 € 744 € 2,361    
[1] See note 2.1.1 for details about the impact of adopting IFRS 16 on Leases and note 2.1.2 for details about the impact of voluntary change in accounting policy on Liability Adequacy Testing
[2] 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.