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Long-term borrowings (Tables)
 12 Months Ended
Dec. 31, 2019
Aegon N.V [member]  
Statement [LineItems]  
Summary of Long-term Borrowings
    
                2019
                   2018 
Remaining terms less than 1 year
   -    78 
Remaining terms 1 - 5 years
   497    496 
Remaining terms 5 - 10 years
   -    - 
Remaining terms over 10 years
   760    717 
At December 31
  
 
1,257
 
  
 
1,292