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Financial Risks - Summary of Credit Quality of USA's Available-For-Sale (AFS) CMBS Portfolio (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Total fair value € 9,080 € 8,597
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member]    
Disclosure of financial assets [line items]    
Total amortized cost 3,323 3,331
Total fair value 3,427 3,314
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost 3,323 3,326
Total fair value 3,427 3,310
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | CMBS and CRE CDOs [member]    
Disclosure of financial assets [line items]    
Total amortized cost   5
Total fair value   4
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AAA [member]    
Disclosure of financial assets [line items]    
Total amortized cost 2,540 2,635
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AAA [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost 2,540 2,635
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AA [member]    
Disclosure of financial assets [line items]    
Total amortized cost 639 567
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AA [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost 639 567
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | A [member]    
Disclosure of financial assets [line items]    
Total amortized cost 109 65
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | A [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost 109 65
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | BBB [member]    
Disclosure of financial assets [line items]    
Total amortized cost 7 3
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | BBB [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost 7 3
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member]    
Disclosure of financial assets [line items]    
Total amortized cost 29 62
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member] | CMBS [member]    
Disclosure of financial assets [line items]    
Total amortized cost € 29 57
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member] | CMBS and CRE CDOs [member]    
Disclosure of financial assets [line items]    
Total amortized cost   € 5