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Cash and Cash Equivalents - Summary of Reconciliation of Liabilities Arising from Financing Activities (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance [1] € 12,061  
Ending balance 9,307 € 12,061 [1]
Subordinated borrowings - held at amortized cost [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,389  
Net exchange difference 11 52
Ending balance 2,207 1,389
Trust pass-through securities - held at amortized cost [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 133  
Net exchange difference 2 6
Ending balance 136 133
Borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 12,061  
Net exchange difference 149 263
Ending balance 9,307 12,061
Assets held to hedge Trust pass through securities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 10  
Net exchange difference 0 1
Ending balance 11 10
Cash flow hedges [member] | Subordinated borrowings - held at amortized cost [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,389 764
Addition 806 640
Repayment 0 0
Disposal of a business   0
Realized gains / losses in income statement 0 0
Movements related to fair value hedges 0 0
Amortization 1 2
Transfer to/from other headings   (68)
Other 0 0
Ending balance   1,389
Cash flow hedges [member] | Trust pass-through securities - held at amortized cost [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 133 133
Addition 0 0
Repayment 0 0
Disposal of a business   0
Realized gains / losses in income statement 0 0
Movements related to fair value hedges 1 (6)
Amortization (1) 0
Transfer to/from other headings   0
Other 0 0
Ending balance   133
Cash flow hedges [member] | Borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 12,061 13,635
Addition 4,117 3,545
Repayment (7,014) (5,211)
Disposal of a business   (151)
Realized gains / losses in income statement (8) (23)
Movements related to fair value hedges 0 0
Amortization 1 2
Transfer to/from other headings   0
Other 0 0
Ending balance   12,061
Cash flow hedges [member] | Assets held to hedge Trust pass through securities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 10 15
Addition 0 0
Repayment 0 0
Disposal of a business   0
Realized gains / losses in income statement 1 (6)
Movements related to fair value hedges 0 0
Amortization 0 0
Transfer to/from other headings   0
Other € 0 0
Ending balance   € 10
[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.