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Investment Contracts - Summary of Investment Contracts for General Account (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of investment contracts general account [Line Items]      
Beginning balance € 18,048 € 16,943  
Portfolio transfers and acquisitions   271  
Deposits 13,234 10,308  
Withdrawals (13,768) (10,101)  
Investment contracts liabilities released (23) (53)  
Interest credited 247 236  
Net exchange differences 140 332  
Transfer to/from other headings 724 133  
Other (7) (22)  
Ending balance 18,594 18,048  
Institutional guaranteed products 339 944  
Fixed annuities 6,237 5,981  
Savings accounts 11,517 10,586  
Investment contracts with discretionary participation features 211 223  
Other 289 314  
Investment contracts liabilities 18,594 18,048 [1] € 16,943
Without Discretionary Participation Features [member]      
Disclosure of investment contracts general account [Line Items]      
Beginning balance 17,825 16,665  
Portfolio transfers and acquisitions   271  
Deposits 13,234 10,308  
Withdrawals (13,768) (10,101)  
Interest credited 247 236  
Net exchange differences 128 335  
Transfer to/from other headings 724 133  
Other (7) (22)  
Ending balance 18,382 17,825  
With Discretionary Participation Features [member]      
Disclosure of investment contracts general account [Line Items]      
Beginning balance 223 278  
Investment contracts liabilities released (23) (53)  
Net exchange differences 12 (2)  
Ending balance € 211 € 223  
[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.