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Other Equity Instruments - Summary of Coupon Details - Junior Perpetual Capital Securities (Parenthetical) (Detail) - Junior perpetual capital securities [member]
12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 15, 2019
USD ($)
Jun. 15, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
USD 500 million [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 500,000,000   $ 500,000,000   $ 500,000,000
USD 250 million [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 250,000,000        
Basis point 87.50% 87.50%        
Basis point interest rate 4.00% 4.00%        
Basis point description The coupon of the USD 250 million junior perpetual capital securities is reset each quarter based on the then prevailing three-month LIBOR yield plus a spread of 87.5 basis points, with a minimum of 4%.          
USD 250 million [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 250,000,000       250,000,000
Basis point 0.875% 0.875%        
Basis point interest rate 4.00% 4.00%        
Basis point description The coupon of the USD 250 million junior perpetual capital securities is reset each quarter based on the then prevailing three-month LIBOR yield plus a spread of 87.5 basis points, with a minimum of 4%.          
USD 500 million [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 500,000,000        
Basis point interest rate 8.50% 8.50%        
Basis point description The coupon of the USD 500 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year US dollar interest rate swap yield plus a spread of ten basis points, with a maximum of 8.5%.          
USD 500 million [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 500,000,000       500,000,000
Basis point 0.10% 0.10%        
Basis point interest rate 8.50% 8.50%        
Basis point description The coupon of the USD 500 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year US dollar interest rate swap yield plus a spread of ten basis points, with a maximum of 8.5%.          
USD 1 billion [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 1,000,000,000 $ 1,000,000,000     $ 1,000,000,000
EUR 950 million [member]            
Disclosure of other equity instruments [line items]            
Principal amount   $ 950,000,000        
Basis point interest rate 8.00% 8.00%        
Basis point description The coupon of the EUR 950 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year Dutch government bond yield plus a spread of ten basis points, with a maximum of 8%.          
EUR 950 million [member] | Aegon N.V [member]            
Disclosure of other equity instruments [line items]            
Principal amount | € € 950,000,000       € 950,000,000  
Basis point 0.10% 0.10%        
Basis point interest rate 8.00% 8.00%        
Basis point description The coupon of the EUR 950 million junior perpetual capital securities is reset each quarter based on the then prevailing ten-year Dutch government bond yield plus a spread of ten basis points, with a maximum of 8%.