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Other Equity Instruments - Summary of Other Equity Instruments (Detail)
Unit_pure in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 3,320 3,794 3,797
Shares granted 21 16 26
Shares vested (26) (19) (30)
Securities issued 500    
Securities redeemed (1,244) (471)  
Ending balance 2,571 3,320 3,794
Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 3,320 3,794  
Shares granted 21 16  
Shares vested (26) (19)  
Securities issued 500    
Securities redeemed (1,244) (471)  
Ending balance 2,571 3,320 3,794
Perpetual contingent convertible securities [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Securities issued 500    
Ending balance 500    
Perpetual contingent convertible securities [member] | Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance  
Shares granted    
Shares vested    
Securities issued 500    
Securities redeemed    
Ending balance 500
Junior perpetual capital securities [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 2,808 3,008 3,008
Securities redeemed (1,244) (200)  
Ending balance 1,564 2,808 3,008
Junior perpetual capital securities [member] | Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 2,808 3,008  
Shares granted  
Shares vested  
Securities redeemed (1,244) (200)  
Ending balance 1,564 2,808 3,008
Perpetual cumulative subordinated bonds [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 454 454 454
Ending balance 454 454 454
Perpetual cumulative subordinated bonds [member] | Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 454 454  
Shares granted    
Shares vested    
Ending balance 454 454 454
Non-cumulative subordinated notes [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance   271 271
Securities redeemed   (271)  
Ending balance     271
Non-cumulative subordinated notes [member] | Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 271  
Shares granted  
Shares vested  
Securities redeemed   (271)  
Ending balance 271
Long term incentive plans [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 58 61 65
Shares granted 21 16 26
Shares vested (26) (19) (30)
Ending balance 53 58 61
Long term incentive plans [member] | Aegon N.V [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Beginning balance 58 61  
Shares granted 21 16  
Shares vested (26) (19)  
Securities redeemed    
Ending balance 53 58 61