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Income Taxes - Summary of the Components of Income Tax for Period (Income) / Charge (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current tax      
Current year € 118 € 54 € 220
Adjustments to prior years (14) (36) 47
Current tax 104 18 267
Deferred tax      
Origination / (reversal) of temporary differences 69 23 397
Changes in tax rates / bases 33 (30) (550)
Changes in deferred tax assets as a result of recognition / write off of previously not recognized / recognized tax losses, tax credits and deductible temporary differences 4 (35) (45)
Non-recognition of deferred tax assets 17 17 41
Reconciliation between standard and effective tax      
Income before tax 1,457 751 2,534
Differences due to the effect of:      
Non deductible expenses (22) (28) (28)
Adjustments prior year (8) 48 (45)
Deferred tax 114 22 (201)
Income tax for the period (income) / charge 218 40 € 65
Aegon N.V [member]      
Current tax      
Current year 40 2  
Current tax 40 2  
Reconciliation between standard and effective tax      
Income before tax (181) (124)  
Tax on income on Dutch corporate income tax rate 45 31  
Differences due to the effect of:      
Non deductible expenses (6) (5)  
Adjustments prior year   (24)  
Income tax for the period (income) / charge € 40 € 2