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Loans to group companies (Tables)
12 Months Ended
Dec. 31, 2018
Aegon N.V [member]  
Statement [LineItems]  
Summary of Loans to Group Companies
                            2018                           2017  

At January 1

     2,690       4,123  

Additions/(repayments)

     (333     (990

Other changes

     131       (443

At December 31

     2,487       2,690  

Current

     60       439  

Non-current

     2,427       2,251