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Subordinated Borrowings - Summary of Subordinated Borrowings (Parenthetical) (Detail)
€ in Millions, $ in Millions
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Oct. 22, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Apr. 11, 2018
USD ($)
USD 800 million fixed floating subordinated notes [member]            
Disclosure of subordinated liabilities [Line Items]            
Fixed floating subordinated notes   $ 800       $ 800
USD 800 million fixed floating subordinated notes [member] | Aegon N.V [member]            
Disclosure of subordinated liabilities [Line Items]            
Fixed floating subordinated notes   800     $ 800 $ 800
EUR 700 million fixed floating subordinated notes [member]            
Disclosure of subordinated liabilities [Line Items]            
Fixed floating subordinated notes | € € 700          
EUR 700 million fixed floating subordinated notes [member] | Aegon N.V [member]            
Disclosure of subordinated liabilities [Line Items]            
Fixed floating subordinated notes | € € 700     € 700    
USD 925 million fixed subordinated notes [member]            
Disclosure of subordinated liabilities [Line Items]            
Fixed floating subordinated notes   $ 925 $ 925   $ 925